com>
To: Mercedes Discussion List <mercedes@okiebenz.com>
Cc: Curly McLain <126die...@gmail.com>
Sent: Thursday, January 7, 2016 5:37 PM
Subject: Re: [MBZ] 124 tachometers
I pulled the plug from the EDS computer. I found the tach signal
voltage in the plug to the computer, but I
com>
To: Mercedes Discussion List <mercedes@okiebenz.com>
Cc: Curly McLain <126die...@gmail.com>
Sent: Thursday, January 7, 2016 5:37 PM
Subject: Re: [MBZ] 124 tachometers
I pulled the plug from the EDS computer. I found the tach signal
voltage in the plug to the computer, but I
oun...@okiebenz.com> on behalf of Curly
McLain via Mercedes <mercedes@okiebenz.com>
Sent: 07 January 2016 20:39
To: Mercedes Discussion List
Cc: Curly McLain
Subject: Re: [MBZ] 124 tachometers
Got back to checking tach and speedo taday. Pulled the head, cable
no turney, so looks like I need
Lain
Subject: Re: [MBZ] 124 tachometers
Got back to checking tach and speedo taday. Pulled the head, cable
no turney, so looks like I need a new cable. Tach has no signal at
the head, but did have a signal behind the battery. so, it appears
like either there is no signal coming out of the
.
From: Mercedes <mercedes-boun...@okiebenz.com> on behalf of Curly McLain via
Mercedes <mercedes@okiebenz.com>
Sent: 07 January 2016 22:37
To: Mercedes Discussion List
Cc: Curly McLain
Subject: Re: [MBZ] 124 tachometers
I pulled the plug
Curly.
The ring gear pickup L3 sits between pin 20- ws and pin 3- br/ge of
N39 the EDS control unit.
The output from pin 25 gn/sw goes to the test skt X29/4 then to N6
(Klima) pin 2 gn/sw and via X26 gn/ge to the instrument cluster A1
P7 marked TD (no pin number indicated).
Confused yet.
from underneath.
Fred
From: Mercedes <mercedes-boun...@okiebenz.com> on behalf of Curly McLain
via Mercedes <mercedes@okiebenz.com>
Sent: 02 December 2015 13:52
To: Mercedes Discussion List
Cc: Curly McLain
Subject: Re: [MBZ] 124 tachom
es <mercedes@okiebenz.com>
Sent: 02 December 2015 13:52
To: Mercedes Discussion List
Cc: Curly McLain
Subject: Re: [MBZ] 124 tachometers
Check the connection for the Hall effect pickup at the rear of the
engine. It often gets corroded, being exposed to road splash, and
gives an interm
iebenz.com>
Sent: 02 December 2015 13:52
To: Mercedes Discussion List
Cc: Curly McLain
Subject: Re: [MBZ] 124 tachometers
Check the connection for the Hall effect pickup at the rear of the
engine. It often gets corroded, being exposed to road splash, and
gives an intermittent or very
Hmm I've never heard of the tach itself dying, but after 29yrs,
anything is possible. Congrats! You got the odd one!
Twice, for me. Fixed them both. Bad electrolytic capacitor in
the last one.
-- Jim
___
http://www.okiebenz.com
To search list
The tach signal goes into the EDS computer (main engine computer) and gets
split out from there to the cluster and the KLIMA and maybe other
consumers. I think there is some amplification in the EDS computer, I
don't know if there is any other processing. Do you have a wiring
diagram? I bought
st
Cc: Curly McLain
Subject: Re: [MBZ] 124 tachometers
>Check the connection for the Hall effect pickup at the rear of the
>engine. It often gets corroded, being exposed to road splash, and
>gives an intermittent or very low signal. Mine works (as does the
>idle speed control) only w
;
>> Sent: 02 December 2015 13:52
>> To: Mercedes Discussion List
>> Cc: Curly McLain
>> Subject: Re: [MBZ] 124 tachometers
>>
>> Check the connection for the Hall effect pickup at the rear of the
>>> engine. It often gets corroded, being exposed to roa
from underneath.
Fred
From: Mercedes <mercedes-boun...@okiebenz.com> on behalf of Curly
McLain via Mercedes <mercedes@okiebenz.com>
Sent: 02 December 2015 13:52
To: Mercedes Discussion List
Cc: Curly McLain
Subject: Re: [MBZ] 124 tachome
KLIMA relay is a consumer of the tachometer signal, not a processor. OVP relay
protects the main computer, which _I think_ processes the tachometer signal?
I had a dead tachometer in The White Whale, I pulled the cluster and measured
the signal using the A.C. function of my digital multimeter
KLIMA relay is a consumer of the tachometer signal, not a processor.
OVP relay protects the main computer, which _I think_ processes the
tachometer signal?
I had a dead tachometer in The White Whale, I pulled the cluster and
measured the signal using the A.C. function of my digital multimeter
Check the connection for the Hall effect pickup at the rear of the
engine. It often gets corroded, being exposed to road splash, and
gives an intermittent or very low signal. Mine works (as does the
idle speed control) only when it's wet, never have gotten around to
fixing it.
Might be a
I seem to have 2 124 Diesels ( 87 300D) with non working tachometers.
I have a couple of spare Klimas, so I can try swapping them and the
OVP relay to start. I did that on one of them before with no change.
Also tried direct ground on the cluster with no effect. OVP relays,
I have to swap
oun...@okiebenz.com> on behalf of Curly McLain via
Mercedes <mercedes@okiebenz.com>
Sent: 02 December 2015 04:26
To: Mercedes Discussion List
Cc: Curly McLain
Subject: Re: [MBZ] 124 tachometers
>Curly.
>My '87 TD had an intermittent Tach which then died.
>It turned out to be th
.
Fred
From: Mercedes <mercedes-boun...@okiebenz.com> on behalf of Curly McLain via
Mercedes <mercedes@okiebenz.com>
Sent: 02 December 2015 02:25
To: Mercedes Discussion List
Cc: Curly McLain
Subject: [MBZ] 124 tachometers
I seem to have 2 124 Diese
Check the connection for the Hall effect pickup at the rear of the
engine. It often gets corroded, being exposed to road splash, and
gives an intermittent or very low signal. Mine works (as does the
idle speed control) only when it's wet, never have gotten around to
fixing it.
Might be
Curly.
My '87 TD had an intermittent Tach which then died.
It turned out to be the small ground wire(s), under the large main
ground wire bolted to the shock mount, were broken off. On my TD the
shock mount was coming adrift at the seams, thus fatigued the wires
that eventually failed.
YMMV.
22 matches
Mail list logo
