The BMW UUC Digest
Volume 3 : Issue 268 : "text" Format
Messages in this Issue:
BMP plastic pulley warning Valid??
Re: BMP plastic pulley warning Valid??
Re: BMP plastic pulley warning Valid??
Re: [bimmerheads] BMP plastic pulley warning Valid??
Re: BMP plastic pulley warning Valid??
E30 M20 failure mode
Re: E30 M20 failure mode
Re: E30 M20 failure mode
Re: E30 M20 failure mode
----------------------------------------------------------------------
Date: Fri, 22 Sep 2006 20:36:13 -0700
From: Harvey Chao <[EMAIL PROTECTED]>
To: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]>,
Bimmerheads <[EMAIL PROTECTED]>, bmwuucdigest@uucdigest.com
Subject: BMP plastic pulley warning Valid??
Message-ID: <[EMAIL PROTECTED]>
So I get this BMP news letter, one entry of which is a warning about
late model (post '92 build) engines with serpentine belts that use
plastic pulleys that crack and fracture with nasty secondary
consequences.
Any instances in this population of this happening?
Trying to separate fact from marketing.
Harvey
------------------------------
Date: Fri, 22 Sep 2006 23:51:30 -0400
From: Ed MacVaugh <[EMAIL PROTECTED]>
To: bmwuucdigest@uucdigest.com
Subject: Re: BMP plastic pulley warning Valid??
Message-ID: <[EMAIL PROTECTED]>
My '96 went over 156K today with original plastic pulley.
My 93 740 also has one.
Ed
Harvey Chao wrote:
> So I get this BMP news letter, one entry of which is a warning about
> late model (post '92 build) engines with serpentine belts that use
> plastic pulleys that crack and fracture with nasty secondary consequences.
>
> Any instances in this population of this happening?
>
> Trying to separate fact from marketing.
>
> Harvey
> Search the ARCHIVES:http://www.mail-archive.com/bmwuucdigest@uucdigest.com
>
>
> __________________________________________________________________________
> In memory of Michel Potheau - friend, enthusiast, founder of the BMW CCA.
>
> UUC Motorwerks - BMW Performance Fine-tuning and home of the Ultimate
> Short Shifter - accept no substitutes!
> 908-874-9092 . http://www.uucmotorwerks.com
>
>
------------------------------
Date: Fri, 22 Sep 2006 22:53:50 -0700
From: Mark Gold <[EMAIL PROTECTED]>
To: Harvey Chao <[EMAIL PROTECTED]>
Cc: UUC Digest <bmwuucdigest@uucdigest.com>
Subject: Re: BMP plastic pulley warning Valid??
Message-ID: <[EMAIL PROTECTED]>
Yeah, I saw that too and I've never heard of that happening. The
closest I've come to that was when my Air Conditioning Idler backed
out from its screw and fell off the motor.
On Sep 22, 2006, at 8:36 PM, Harvey Chao wrote:
> So I get this BMP news letter, one entry of which is a warning
> about late model (post '92 build) engines with serpentine belts
> that use plastic pulleys that crack and fracture with nasty
> secondary consequences.
>
> Any instances in this population of this happening?
>
> Trying to separate fact from marketing.
>
> Harvey
> Search the ARCHIVES:http://www.mail-archive.com/
> bmwuucdigest@uucdigest.com
>
>
> ______________________________________________________________________
> ____
> In memory of Michel Potheau - friend, enthusiast, founder of the
> BMW CCA.
>
> UUC Motorwerks - BMW Performance Fine-tuning and home of the Ultimate
> Short Shifter - accept no substitutes!
> 908-874-9092 . http://www.uucmotorwerks.com
------------------------------
Date: Sat, 23 Sep 2006 16:35:13 -0700
From: Harvey Chao <[EMAIL PROTECTED]>
To: Bay Area Bimmerheads <[EMAIL PROTECTED]>,
bmwuucdigest@uucdigest.com,
"[EMAIL PROTECTED]" <[EMAIL PROTECTED]>
Subject: Re: [bimmerheads] BMP plastic pulley warning Valid??
Message-ID: <[EMAIL PROTECTED]>
Score is now 6 replies, sort of 3 and 3,
3 - no, haven't heard or no issue to date
1 - "ducked a bullet" on a water pump pulley that fell apart as the
belt was being re-installed
1 - "heard about this on Rovers when BMW owned Rover
1 - seen faiure of idler and tensioner but seems related to pulley's
bearing failure first (see below)
On Sep 23, 2006, at 12:44 PM,
> At 08:36 PM 9/22/2006, Harvey Chao wrote:
>
> >So I get this BMP news letter, one entry of which is a warning about
> >late model (post '92 build) engines with serpentine belts that use
> >plastic pulleys that crack and fracture with nasty secondary
> >consequences.
>
> I haven't seen any drive pulley failures (except for chips out of
> the edges
> of the water pump pulleys from being dropped during a water pump
> replacement), but I have seen failures of the idler and tensioner
> pulleys. My guess is that when the bearing fails, the ribs that
> support
> the outside of the pulley are overstressed, causing the outside of the
> pulley to separate from the hub. I've seen this on the M50-based
> engines,
> but that doesn't mean that it can't happen on any of the other
> engines.
>
> However, this isn't something that happens without warning. The
> bearings
> usually start to make noise long before they fail. My
> recommendation is to
> check the idler and tensioner pulleys whenever you have the belts
> off -
> just give them a spin to see if the bearing is making any noise,
> and wiggle
> them to check for play. If you have a mechanic's stethoscope (or
> use the
> old long screwdriver trick), listen to the pulleys with the engine
> idling
> (be very careful not to get anything caught in any of the moving
> parts...). If you hear a noisy bearing, replace the pulley.
>
>
> __,_._,___
------------------------------
Date: Sat, 23 Sep 2006 09:18:09 -0500
From: "Marc Plante" <[EMAIL PROTECTED]>
To: bmwuucdigest@uucdigest.com
Subject: Re: BMP plastic pulley warning Valid??
Message-ID: <[EMAIL PROTECTED]>
Um...been there, done that. There's an idler pulley that is conveniently the
same size as a pulley on the air conditioner belt. Don't know if it cracked
and failed or seized and exploded, but it failed about 45 mins short of Mid
Ohio. Cut my weekend short as I was caught offguard and headed home to be safe.
overall give your pulleys a listen for bearing wear and check for cracks.
They're pretty easy to do if you're doing the waterpumpradiatorthermostat job
every 60-90k miles.
In a pinch, you can swap over the Air conditioner pulley. If you go to the
local parts store, it will be listed as an air conditioner pulley.
You'll need a 7mm allen socket or an allen key plus a closed end box wrench to
get it off. There's a plastic cover over the allen screw.
Marc Plante
E36 325i, (sold at 230k)
E36 M3/4 74k
> ----- Original Message -----
> From: "Mark Gold" <[EMAIL PROTECTED]>
> To: "Harvey Chao" <[EMAIL PROTECTED]>
> Subject: Re: [UUC] BMP plastic pulley warning Valid??
> Date: Fri, 22 Sep 2006 22:53:50 -0700
>
>
> Yeah, I saw that too and I've never heard of that happening. The
> closest I've come to that was when my Air Conditioning Idler backed
> out from its screw and fell off the motor.
>
> On Sep 22, 2006, at 8:36 PM, Harvey Chao wrote:
>
> > So I get this BMP news letter, one entry of which is a warning
> > about late model (post '92 build) engines with serpentine belts
> > that use plastic pulleys that crack and fracture with nasty
> > secondary consequences.
> >
> > Any instances in this population of this happening?
> >
> > Trying to separate fact from marketing.
> >
> > Harvey
> > Search the ARCHIVES:http://www.mail-archive.com/ bmwuucdigest@uucdigest.com
> >
> >
> > ______________________________________________________________________ ____
> > In memory of Michel Potheau - friend, enthusiast, founder of the BMW CCA.
> >
> > UUC Motorwerks - BMW Performance Fine-tuning and home of the Ultimate
> > Short Shifter - accept no substitutes!
> > 908-874-9092 . http://www.uucmotorwerks.com
>
> Search the ARCHIVES:http://www.mail-archive.com/bmwuucdigest@uucdigest.com
>
>
> __________________________________________________________________________
> In memory of Michel Potheau - friend, enthusiast, founder of the BMW CCA.
>
> UUC Motorwerks - BMW Performance Fine-tuning and home of the Ultimate
> Short Shifter - accept no substitutes!
> 908-874-9092 . http://www.uucmotorwerks.com
>
------------------------------
Date: Sat, 23 Sep 2006 21:39:40 -0400
From: Ed MacVaugh <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED], bmwuucdigest@uucdigest.com
Subject: E30 M20 failure mode
Message-ID: <[EMAIL PROTECTED]>
Encountered an interesting failure in my daughter's '89 325i.
Car has been plagued for some months with a miss at idle.
I don't hear real well but I tried all the usual suspects, cracked
hoses, electrical checks on the sensors, compression check of all
cylinders (fine), regapped all the plugs, tested each ignition wire.
Decided to have the injectors cleaned and checked at Cruzin. Mailed off
a spare set and replaced them last week.
Did the replacement surgically, without removing the intake manifold.
lifted the electrical bar from all the injectors, removed the two sensor
connectors, and the big one at the lower driver's side under the
manifold and snaked the whole harness out from under the manifold.
I removed the four hold down bolts, pried up the rail and removed and
replaced every one of the injectors.
Cleaned everything with brake clean and started up the car. Not only did
I have the idle problem, I had an enormous whistle from the injector
nearest the firewall, which I call number six cylinder.
I removed and reinstalled those injectors a total of six times,
scrambling them around and the problem remained at the rear cylinder. I
squirted oil in the area and the sound barely changed pitch, I replaced
those $3 o-rings on the bases of the injectors, I used silicone grease
on the o-rings to make them slick, cleaned every injector hole with
q-tips, jockeyed the fuel rail fore and aft to try to change the pitch
of the whistle, to no avail.
In exasperation, I pulled off the manifold and found that the gasket was
split for the intake manifold at the number six cylinder and the whistle
was coming from the manifold to head interface, not the injector to
manifold interface.
With all this air coming in, what is the likelihood I burned the piston
or the valve?
Ed
------------------------------
Date: Sat, 23 Sep 2006 20:50:20 -0500
From: Eric Giles <[EMAIL PROTECTED]>
To: bmwuucdigest@uucdigest.com
Cc: [EMAIL PROTECTED]
Subject: Re: E30 M20 failure mode
Message-ID: <[EMAIL PROTECTED]>
I'm no expert, but I had the same leak on my previous '90 325is and
drove it like that for a couple of weeks before I replaced it. Car ran
just as well as it did previous to the intake leak. I seriously doubt
any damage has occured.
Eric Giles
'88 M3
> In exasperation, I pulled off the manifold and found that the gasket
> was split for the intake manifold at the number six cylinder and the
> whistle was coming from the manifold to head interface, not the
> injector to manifold interface.
>
> With all this air coming in, what is the likelihood I burned the
> piston or the valve?
>
> Ed
> Search the
> ARCHIVES:http://www.mail-archive.com/bmwuucdigest@uucdigest.com
>
>
> __________________________________________________________________________
>
> In memory of Michel Potheau - friend, enthusiast, founder of the BMW CCA.
>
> UUC Motorwerks - BMW Performance Fine-tuning and home of the Ultimate
> Short Shifter - accept no substitutes!
> 908-874-9092 . http://www.uucmotorwerks.com
>
------------------------------
Date: Sat, 23 Sep 2006 20:51:08 -0500
From: Jenny Morgan <[EMAIL PROTECTED]>
To: Ed MacVaugh <[EMAIL PROTECTED]>
Cc: UUC Digest <bmwuucdigest@uucdigest.com>
Subject: Re: E30 M20 failure mode
Message-ID: <[EMAIL PROTECTED]>
Hard to say on any given car if there will be damage, but as this #6
gasket issue is a well known phenomenon in the M20 engine, and I
haven't heard a bunch of complaints that would indicate others have had
additional damage, I'd bet you're gonna be OK.
Jenny Morgan
On Sep 23, 2006, at 8:39 PM, Ed MacVaugh wrote:
> In exasperation, I pulled off the manifold and found that the gasket
> was split for the intake manifold at the number six cylinder and the
> whistle was coming from the manifold to head interface, not the
> injector to manifold interface.
>
> With all this air coming in, what is the likelihood I burned the
> piston or the valve?
>
> Ed
> Search the
> ARCHIVES:http://www.mail-archive.com/bmwuucdigest@uucdigest.com
>
>
> _______________________________________________________________________
> ___
> In memory of Michel Potheau - friend, enthusiast, founder of the BMW
> CCA.
>
> UUC Motorwerks - BMW Performance Fine-tuning and home of the Ultimate
> Short Shifter - accept no substitutes!
> 908-874-9092 . http://www.uucmotorwerks.com
------------------------------
Date: Sat, 23 Sep 2006 22:30:28 -0400
From: Ed MacVaugh <[EMAIL PROTECTED]>
To: Gary Derian <[EMAIL PROTECTED]>, bmwuucdigest@uucdigest.com,
[EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED]
Subject: Re: E30 M20 failure mode
Message-ID: <[EMAIL PROTECTED]>
Gary, Jenny and Eric,
Then reassembly commences!
Thanks,
Ed
Gary Derian wrote:
> Peak combustion temperatures occur slightly lean of stoichiometric.
> Going leaner cools things off. The engine runs stoichiometric during
> everything but WOT so a vacuum leak will not burn stuff.
> Gary Derian
>
>>
>> With all this air coming in, what is the likelihood I burned the
>> piston or the valve?
>>
>> Ed
>
>
>
>
>
------------------------------
End of [bmwuucdigest] digest(9 messages)
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