Re: [MBZ] HELP! LOW/NO OIL PRESSURE

[ernest breakfield]

not positive which way it would work on that year/model, but regardless, 
it would make sense to deal with the known instrumentation problem 
first, rather than ASSuME the gauge is indicating a larger problem.
   at the very least, put a mechanical gauge on it to try to verify if 
there really even *is* a problem, before you start getting worried about 
chasing down bigger potential issues...



cheers!
e


Luther wrote:

If the ground is bad, the gauge should be pegged, correct?
Luther

ernest breakfield wrote:
since there is already a known problem with the instrumentation, 
wouldn't it be prudent to address that before assuming that the 
instrumentation is indicating a problem, and/or verify by other means 
that the oil pressure reported is indeed actually out of range?


   a question for the veterans; isn't there a ground behind the 
instrument panel that's known to occasionally be a problem with these 
things? IIRC, isn't its failure mode pretty-much exactly like the 
wonkiness with the temp and fuel gauges that's being reported here?



cheers!
e


Dan Weeks wrote:
'82 300SD 314k daily driver. Runs great. Lately, I'd been noticing 
oil pressure seemed a bit low at idle, but my idle's set too low, so 
I didn't think much of it. Today, I notice a half-bar at idle. 
Slipped it into Neutral, and it came up to a bar. Next short trip, 
same day, OP fine until car warmed up, then it went down to barely 
off the peg at idle. Turned around to come home, and OP gradually 
tailed off to nothing. Stopped the car. Checked oil level, which was 
fine. Oil seemed a bit thin, but not watery by any means, and the 
engine was hot. Looked like plenty of oil sitting on the cam when I 
took the OP filler cap off to check. Started up again, and had 
between 2 and 3 bar at 2k rpm. Had just a few blocks to go, so drove 
it back. Needle was quite erratic--would go up to the top peg, then 
fall down to 0. WHen revved up it would suddenly jump up--most of 
the time. Sometimes it wouldn't move at all.  Got home, with no 
other signs of low OP--engine ran fine, no unusual noises, no blue 
smoke.


What gives? How can I test the gauge/sensor? Is there any way I can 
temporarily wire in an aux OP gauge to check? If so, how. I have a 
somewhat jumpy temp gauge and fuel gauge, and the tach is inop most 
of the time, so I'm hoping it's just electrical. Is there a 
pattern/failure mode for 617 oil pumps? Could something be 
intermittantly plugging the pickup tube screen? I'm trying to think 
of everything I can here. Car is parked until I figure this one out. 
Any advice/test procedures appreciated.


Thanks in advance!

Dan








--
I am crewing on the Motorcycle Safety Crew for the AIDS LifeCycle ride 
from SF to LA for a week in June to raise money for the fight against 
AIDS. To learn more and/or to donate to the cause, go here: 
http://www.tofighthiv.org/goto/ernestb

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Re: [MBZ] HELP! LOW/NO OIL PRESSURE

[Luther]

If the ground is bad, the gauge should be pegged, correct? 


Luther

ernest breakfield wrote:
since there is already a known problem with the instrumentation, 
wouldn't it be prudent to address that before assuming that the 
instrumentation is indicating a problem, and/or verify by other means 
that the oil pressure reported is indeed actually out of range?


   a question for the veterans; isn't there a ground behind the 
instrument panel that's known to occasionally be a problem with these 
things? IIRC, isn't its failure mode pretty-much exactly like the 
wonkiness with the temp and fuel gauges that's being reported here?



cheers!
e


Dan Weeks wrote:
'82 300SD 314k daily driver. Runs great. Lately, I'd been noticing 
oil pressure seemed a bit low at idle, but my idle's set too low, so 
I didn't think much of it. Today, I notice a half-bar at idle. 
Slipped it into Neutral, and it came up to a bar. Next short trip, 
same day, OP fine until car warmed up, then it went down to barely 
off the peg at idle. Turned around to come home, and OP gradually 
tailed off to nothing. Stopped the car. Checked oil level, which was 
fine. Oil seemed a bit thin, but not watery by any means, and the 
engine was hot. Looked like plenty of oil sitting on the cam when I 
took the OP filler cap off to check. Started up again, and had 
between 2 and 3 bar at 2k rpm. Had just a few blocks to go, so drove 
it back. Needle was quite erratic--would go up to the top peg, then 
fall down to 0. WHen revved up it would suddenly jump up--most of the 
time. Sometimes it wouldn't move at all.  Got home, with no other 
signs of low OP--engine ran fine, no unusual noises, no blue smoke.


What gives? How can I test the gauge/sensor? Is there any way I can 
temporarily wire in an aux OP gauge to check? If so, how. I have a 
somewhat jumpy temp gauge and fuel gauge, and the tach is inop most 
of the time, so I'm hoping it's just electrical. Is there a 
pattern/failure mode for 617 oil pumps? Could something be 
intermittantly plugging the pickup tube screen? I'm trying to think 
of everything I can here. Car is parked until I figure this one out. 
Any advice/test procedures appreciated.


Thanks in advance!

Dan






--

--
Luther   KB5QHUAlma, Ark
'87 300SDL (281,xxx mi)
'85 Ford F250 6.9 diesel (x59,xxx mi) BioBeast
'82 300CD (183 kmi)
'82 300D  (74 kmi) getting donor engine-sold
'85 300D (280,176) parts car sans engine "The Accordion"


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Re: [MBZ] HELP! LOW/NO OIL PRESSURE

[Allan Streib]

On Mon, 18 May 2009 20:57 -0500, "Wonko the Sane"  wrote:

> I don't have the know-how, but I wish someone smarter than me would
> tell him how to hook up an external oil pressure gauge.

Harbor Freight sells an inexpensive oil pressure test gauge kit.  It
comes with fittings that should work with almost any engine.

  http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=92687

Typically you remove the sender where it's screwed into the block and
attach the test gauge.

Allan
--
1983 300D

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Re: [MBZ] HELP! LOW/NO OIL PRESSURE

[Tom Hargrave]

It's screwed into the side of the oil filter housing towards the bottom. The
issue is more likely the connection to the sender than the sender itself.

Thanks,
Tom Hargrave
www.kegkits.com
http://www.kegkits.com/JABF/
256-656-1924
 

-Original Message-
From: mercedes-boun...@okiebenz.com [mailto:mercedes-boun...@okiebenz.com]
On Behalf Of Dan Weeks
Sent: Tuesday, May 19, 2009 7:38 AM
To: mercedes@okiebenz.com
Subject: Re: [MBZ] HELP! LOW/NO OIL PRESSURE

Many thanks for all the help. I've now sniffed my oil, and it smells  
like oil, so I'm pretty sure my IP seals are OK. I've also taken a  
good hard look at the OP gauge needle when I switch off the car, and  
it drops slowly, not instantaneously like the Temp gauge, so I THINK  
the issue is electrical. I want to make sure my trying the trick  
below. Can anyone tell me where the gauge sender is on a 617?

Thanks!


Dan Weeks
Freelance Writing & Photography
515/279-4825

>
> I think that you can simply unscrew the sender and screw in the  
> appropriate
> pipe fitting to hook your gauge up to.
>
> Barry
>

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Re: [MBZ] HELP! LOW/NO OIL PRESSURE

[Dan Weeks]

Many thanks for all the help. I've now sniffed my oil, and it smells  
like oil, so I'm pretty sure my IP seals are OK. I've also taken a  
good hard look at the OP gauge needle when I switch off the car, and  
it drops slowly, not instantaneously like the Temp gauge, so I THINK  
the issue is electrical. I want to make sure my trying the trick  
below. Can anyone tell me where the gauge sender is on a 617?


Thanks!


Dan Weeks
Freelance Writing & Photography
515/279-4825



I think that you can simply unscrew the sender and screw in the  
appropriate

pipe fitting to hook your gauge up to.

Barry



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Re: [MBZ] HELP! LOW/NO OIL PRESSURE

[Barry Stark]

I think that you can simply unscrew the sender and screw in the appropriate
pipe fitting to hook your gauge up to.

Barry

-Original Message-
From: mercedes-boun...@okiebenz.com [mailto:mercedes-boun...@okiebenz.com]
On Behalf Of Wonko the Sane
Sent: Monday, May 18, 2009 6:58 PM
To: Mercedes Discussion List
Subject: Re: [MBZ] HELP! LOW/NO OIL PRESSURE

I don't have the know-how, but I wish someone smarter than me would tell him
how to hook up an external oil pressure gauge.




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Re: [MBZ] HELP! LOW/NO OIL PRESSURE

[Wonko the Sane]

I don't have the know-how, but I wish someone smarter than me would tell him
how to hook up an external oil pressure gauge.

On Mon, May 18, 2009 at 3:02 PM, Dan Weeks  wrote:

> '82 300SD 314k daily driver. Runs great. Lately, I'd been noticing oil
> pressure seemed a bit low at idle, but my idle's set too low, so I didn't
> think much of it. Today, I notice a half-bar at idle. Slipped it into
> Neutral, and it came up to a bar. Next short trip, same day, OP fine until
> car warmed up, then it went down to barely off the peg at idle. Turned
> around to come home, and OP gradually tailed off to nothing. Stopped the
> car. Checked oil level, which was fine. Oil seemed a bit thin, but not
> watery by any means, and the engine was hot. Looked like plenty of oil
> sitting on the cam when I took the OP filler cap off to check. Started up
> again, and had between 2 and 3 bar at 2k rpm. Had just a few blocks to go,
> so drove it back. Needle was quite erratic--would go up to the top peg, then
> fall down to 0. WHen revved up it would suddenly jump up--most of the time.
> Sometimes it wouldn't move at all.  Got home, with no other signs of low
> OP--engine ran fine, no unusual noises, no blue smoke.
>
> What gives? How can I test the gauge/sensor? Is there any way I can
> temporarily wire in an aux OP gauge to check? If so, how. I have a somewhat
> jumpy temp gauge and fuel gauge, and the tach is inop most of the time, so
> I'm hoping it's just electrical. Is there a pattern/failure mode for 617 oil
> pumps? Could something be intermittantly plugging the pickup tube screen?
> I'm trying to think of everything I can here. Car is parked until I figure
> this one out. Any advice/test procedures appreciated.
>
> Thanks in advance!
>
> Dan
>
>
>
> ___
> http://www.okiebenz.com
> For new and used parts go to www.okiebenz.com
> To search list archives http://www.okiebenz.com/archive/
>
> To Unsubscribe or change delivery options go to:
> http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
>



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Re: [MBZ] HELP! LOW/NO OIL PRESSURE

[Archer]

On some of the old cars we would hold the engine revs up and loosen the 
sender (actually the pressure tube on the old cars) until oil started coming 
out around the threads and was obviously under high pressure.  This was done 
when the gauge was reading very low.  WARNING!  If you back it out too far 
expect to get an oil bath and a big mess.  Don't ask me how I know.  Sounds 
like a bad sender or gauge to me.

Good luck,
Gerry
'83 300D and 240D

Dan Weeks wrote:

'82 300SD 314k daily driver. Runs great. Lately, I'd been noticing oil
pressure seemed a bit low at idle, but my idle's set too low, so I
didn't think much of it. Today, I notice a half-bar at idle. Slipped
it into Neutral, and it came up to a bar. Next short trip, same day,
OP fine until car warmed up, then it went down to barely off the peg
at idle. Turned around to come home, and OP gradually tailed off to
nothing. Stopped the car. Checked oil level, which was fine. Oil
seemed a bit thin, but not watery by any means, and the engine was
hot. Looked like plenty of oil sitting on the cam when I took the OP
filler cap off to check. Started up again, and had between 2 and 3 bar
at 2k rpm. Had just a few blocks to go, so drove it back. Needle was
quite erratic--would go up to the top peg, then fall down to 0. WHen
revved up it would suddenly jump up--most of the time. Sometimes it
wouldn't move at all.  Got home, with no other signs of low OP--engine
ran fine, no unusual noises, no blue smoke.

What gives? How can I test the gauge/sensor? Is there any way I can
temporarily wire in an aux OP gauge to check? If so, how. I have a
somewhat jumpy temp gauge and fuel gauge, and the tach is inop most of
the time, so I'm hoping it's just electrical. Is there a
pattern/failure mode for 617 oil pumps? Could something be
intermittantly plugging the pickup tube screen? I'm trying to think of
everything I can here. Car is parked until I figure this one out. Any
advice/test procedures appreciated.
Thanks in advance!
Dan

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Re: [MBZ] HELP! LOW/NO OIL PRESSURE

[ernest breakfield]

since there is already a known problem with the instrumentation, 
wouldn't it be prudent to address that before assuming that the 
instrumentation is indicating a problem, and/or verify by other means 
that the oil pressure reported is indeed actually out of range?


   a question for the veterans; isn't there a ground behind the 
instrument panel that's known to occasionally be a problem with these 
things? IIRC, isn't its failure mode pretty-much exactly like the 
wonkiness with the temp and fuel gauges that's being reported here?



cheers!
e


Dan Weeks wrote:
'82 300SD 314k daily driver. Runs great. Lately, I'd been noticing oil 
pressure seemed a bit low at idle, but my idle's set too low, so I 
didn't think much of it. Today, I notice a half-bar at idle. Slipped 
it into Neutral, and it came up to a bar. Next short trip, same day, 
OP fine until car warmed up, then it went down to barely off the peg 
at idle. Turned around to come home, and OP gradually tailed off to 
nothing. Stopped the car. Checked oil level, which was fine. Oil 
seemed a bit thin, but not watery by any means, and the engine was 
hot. Looked like plenty of oil sitting on the cam when I took the OP 
filler cap off to check. Started up again, and had between 2 and 3 bar 
at 2k rpm. Had just a few blocks to go, so drove it back. Needle was 
quite erratic--would go up to the top peg, then fall down to 0. WHen 
revved up it would suddenly jump up--most of the time. Sometimes it 
wouldn't move at all.  Got home, with no other signs of low OP--engine 
ran fine, no unusual noises, no blue smoke.


What gives? How can I test the gauge/sensor? Is there any way I can 
temporarily wire in an aux OP gauge to check? If so, how. I have a 
somewhat jumpy temp gauge and fuel gauge, and the tach is inop most of 
the time, so I'm hoping it's just electrical. Is there a 
pattern/failure mode for 617 oil pumps? Could something be 
intermittantly plugging the pickup tube screen? I'm trying to think of 
everything I can here. Car is parked until I figure this one out. Any 
advice/test procedures appreciated.


Thanks in advance!

Dan




--
I am crewing on the Motorcycle Safety Crew for the AIDS LifeCycle ride 
from SF to LA for a week in June to raise money for the fight against 
AIDS. To learn more and/or to donate to the cause, go here: 
http://www.tofighthiv.org/goto/ernestb

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Re: [MBZ] HELP! LOW/NO OIL PRESSURE

[Peter Frederick]

Check for flow (a bad sender usually indicates erratic pressure then  
quits altogether, it won't slowly fade away), but if you think the  
oil is thin, smell it.


If it smells of diesel fuel, your IP is leaking into the crankcase  
and you will damage the engine soon.


A new sender is something like $30, worth a try.

Peter

On May 18, 2009, at 4:46 PM, Gary Hurst wrote:


Bad sender?

On 5/18/09, Dan Weeks  wrote:
'82 300SD 314k daily driver. Runs great. Lately, I'd been noticing  
oil

pressure seemed a bit low at idle, but my idle's set too low, so I
didn't think much of it. Today, I notice a half-bar at idle. Slipped
it into Neutral, and it came up to a bar. Next short trip, same day,
OP fine until car warmed up, then it went down to barely off the peg
at idle. Turned around to come home, and OP gradually tailed off to
nothing. Stopped the car. Checked oil level, which was fine. Oil
seemed a bit thin, but not watery by any means, and the engine was
hot. Looked like plenty of oil sitting on the cam when I took the OP
filler cap off to check. Started up again, and had between 2 and 3  
bar

at 2k rpm. Had just a few blocks to go, so drove it back. Needle was
quite erratic--would go up to the top peg, then fall down to 0. WHen
revved up it would suddenly jump up--most of the time. Sometimes it
wouldn't move at all.  Got home, with no other signs of low OP-- 
engine

ran fine, no unusual noises, no blue smoke.

What gives? How can I test the gauge/sensor? Is there any way I can
temporarily wire in an aux OP gauge to check? If so, how. I have a
somewhat jumpy temp gauge and fuel gauge, and the tach is inop  
most of

the time, so I'm hoping it's just electrical. Is there a pattern/
failure mode for 617 oil pumps? Could something be intermittantly
plugging the pickup tube screen? I'm trying to think of everything I
can here. Car is parked until I figure this one out. Any advice/test
procedures appreciated.

Thanks in advance!

Dan



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Re: [MBZ] HELP! LOW/NO OIL PRESSURE

[Peter Frederick]

Likely your injection pump seals have failed, you are filling the  
crankcase with diesel fuel.


Change the oil and replace the IP.

Peter
On May 18, 2009, at 3:02 PM, Dan Weeks wrote:

'82 300SD 314k daily driver. Runs great. Lately, I'd been noticing  
oil pressure seemed a bit low at idle, but my idle's set too low,  
so I didn't think much of it. Today, I notice a half-bar at idle.  
Slipped it into Neutral, and it came up to a bar. Next short trip,  
same day, OP fine until car warmed up, then it went down to barely  
off the peg at idle. Turned around to come home, and OP gradually  
tailed off to nothing. Stopped the car. Checked oil level, which  
was fine. Oil seemed a bit thin, but not watery by any means, and  
the engine was hot. Looked like plenty of oil sitting on the cam  
when I took the OP filler cap off to check. Started up again, and  
had between 2 and 3 bar at 2k rpm. Had just a few blocks to go, so  
drove it back. Needle was quite erratic--would go up to the top  
peg, then fall down to 0. WHen revved up it would suddenly jump up-- 
most of the time. Sometimes it wouldn't move at all.  Got home,  
with no other signs of low OP--engine ran fine, no unusual noises,  
no blue smoke.


What gives? How can I test the gauge/sensor? Is there any way I can  
temporarily wire in an aux OP gauge to check? If so, how. I have a  
somewhat jumpy temp gauge and fuel gauge, and the tach is inop most  
of the time, so I'm hoping it's just electrical. Is there a pattern/ 
failure mode for 617 oil pumps? Could something be intermittantly  
plugging the pickup tube screen? I'm trying to think of everything  
I can here. Car is parked until I figure this one out. Any advice/ 
test procedures appreciated.


Thanks in advance!

Dan



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Re: [MBZ] HELP! LOW/NO OIL PRESSURE

[Gary Hurst]

Bad sender?

On 5/18/09, Dan Weeks  wrote:
> '82 300SD 314k daily driver. Runs great. Lately, I'd been noticing oil
> pressure seemed a bit low at idle, but my idle's set too low, so I
> didn't think much of it. Today, I notice a half-bar at idle. Slipped
> it into Neutral, and it came up to a bar. Next short trip, same day,
> OP fine until car warmed up, then it went down to barely off the peg
> at idle. Turned around to come home, and OP gradually tailed off to
> nothing. Stopped the car. Checked oil level, which was fine. Oil
> seemed a bit thin, but not watery by any means, and the engine was
> hot. Looked like plenty of oil sitting on the cam when I took the OP
> filler cap off to check. Started up again, and had between 2 and 3 bar
> at 2k rpm. Had just a few blocks to go, so drove it back. Needle was
> quite erratic--would go up to the top peg, then fall down to 0. WHen
> revved up it would suddenly jump up--most of the time. Sometimes it
> wouldn't move at all.  Got home, with no other signs of low OP--engine
> ran fine, no unusual noises, no blue smoke.
>
> What gives? How can I test the gauge/sensor? Is there any way I can
> temporarily wire in an aux OP gauge to check? If so, how. I have a
> somewhat jumpy temp gauge and fuel gauge, and the tach is inop most of
> the time, so I'm hoping it's just electrical. Is there a pattern/
> failure mode for 617 oil pumps? Could something be intermittantly
> plugging the pickup tube screen? I'm trying to think of everything I
> can here. Car is parked until I figure this one out. Any advice/test
> procedures appreciated.
>
> Thanks in advance!
>
> Dan
>
>
>
> ___
> http://www.okiebenz.com
> For new and used parts go to www.okiebenz.com
> To search list archives http://www.okiebenz.com/archive/
>
> To Unsubscribe or change delivery options go to:
> http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
>

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Re: [MBZ] HELP! LOW/NO OIL PRESSURE

[Kaleb C. Striplin]

sounds like the sending unit is bad to me.  Swap it out or install a 
manual guage to check the actual.


Dan Weeks wrote:
'82 300SD 314k daily driver. Runs great. Lately, I'd been noticing oil 
pressure seemed a bit low at idle, but my idle's set too low, so I 
didn't think much of it. Today, I notice a half-bar at idle. Slipped 
it into Neutral, and it came up to a bar. Next short trip, same day, 
OP fine until car warmed up, then it went down to barely off the peg 
at idle. Turned around to come home, and OP gradually tailed off to 
nothing. Stopped the car. Checked oil level, which was fine. Oil 
seemed a bit thin, but not watery by any means, and the engine was 
hot. Looked like plenty of oil sitting on the cam when I took the OP 
filler cap off to check. Started up again, and had between 2 and 3 bar 
at 2k rpm. Had just a few blocks to go, so drove it back. Needle was 
quite erratic--would go up to the top peg, then fall down to 0. WHen 
revved up it would suddenly jump up--most of the time. Sometimes it 
wouldn't move at all.  Got home, with no other signs of low OP--engine 
ran fine, no unusual noises, no blue smoke.


What gives? How can I test the gauge/sensor? Is there any way I can 
temporarily wire in an aux OP gauge to check? If so, how. I have a 
somewhat jumpy temp gauge and fuel gauge, and the tach is inop most of 
the time, so I'm hoping it's just electrical. Is there a 
pattern/failure mode for 617 oil pumps? Could something be 
intermittantly plugging the pickup tube screen? I'm trying to think of 
everything I can here. Car is parked until I figure this one out. Any 
advice/test procedures appreciated.


Thanks in advance!

Dan



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--
Kaleb C. Striplin/Claremore, OK
95 E300, 92 500SEL, 92 300SD, 92 300E 4Matic, 91 300D, 91 300E, 
89 560SEL, 87 300SDL x2, 85 380SE 5.0 Euro, 85 190D, 84 190D, 
84 300D euro manny, 81 240D, 80 240D, 76 240D, 76 300D, 
http://www.okiebenz.com



___
http://www.okiebenz.com
For new and used parts go to www.okiebenz.com
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[MBZ] HELP! LOW/NO OIL PRESSURE

[Dan Weeks]

'82 300SD 314k daily driver. Runs great. Lately, I'd been noticing oil  
pressure seemed a bit low at idle, but my idle's set too low, so I  
didn't think much of it. Today, I notice a half-bar at idle. Slipped  
it into Neutral, and it came up to a bar. Next short trip, same day,  
OP fine until car warmed up, then it went down to barely off the peg  
at idle. Turned around to come home, and OP gradually tailed off to  
nothing. Stopped the car. Checked oil level, which was fine. Oil  
seemed a bit thin, but not watery by any means, and the engine was  
hot. Looked like plenty of oil sitting on the cam when I took the OP  
filler cap off to check. Started up again, and had between 2 and 3 bar  
at 2k rpm. Had just a few blocks to go, so drove it back. Needle was  
quite erratic--would go up to the top peg, then fall down to 0. WHen  
revved up it would suddenly jump up--most of the time. Sometimes it  
wouldn't move at all.  Got home, with no other signs of low OP--engine  
ran fine, no unusual noises, no blue smoke.


What gives? How can I test the gauge/sensor? Is there any way I can  
temporarily wire in an aux OP gauge to check? If so, how. I have a  
somewhat jumpy temp gauge and fuel gauge, and the tach is inop most of  
the time, so I'm hoping it's just electrical. Is there a pattern/ 
failure mode for 617 oil pumps? Could something be intermittantly  
plugging the pickup tube screen? I'm trying to think of everything I  
can here. Car is parked until I figure this one out. Any advice/test  
procedures appreciated.


Thanks in advance!

Dan



___
http://www.okiebenz.com
For new and used parts go to www.okiebenz.com
To search list archives http://www.okiebenz.com/archive/

To Unsubscribe or change delivery options go to:
http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com