The BMW UUC Digest Volume 3 : Issue 269 : "text" Format Messages in this Issue: Re: [bimmerheads] BMP plastic pulley warning Valid?? Re: [bimmerheads] BMP plastic pulley warning Valid??
---------------------------------------------------------------------- Date: Sat, 23 Sep 2006 19:43:52 -0500 From: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> To: <bmwuucdigest@uucdigest.com> Subject: Re: [bimmerheads] BMP plastic pulley warning Valid?? Message-ID: <[EMAIL PROTECTED]> We've never seen one fail in my shop.. 4 years and counting. Jon ______________________________________________ Jon Siccardi - DM #053 #052- Retired TreehouseRacing.com M50conversion.com 615.333.9118 ______________________________________________ ----- Original Message ----- From: "Harvey Chao" <[EMAIL PROTECTED]> To: "Bay Area Bimmerheads" <[EMAIL PROTECTED]>; <bmwuucdigest@uucdigest.com>; "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> Sent: Saturday, September 23, 2006 6:35 PM Subject: Re: [UUC] [bimmerheads] BMP plastic pulley warning Valid?? > 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. >> >> >> __,_._,___ > > 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: Sun, 24 Sep 2006 22:53:23 -0400 From: KMS- Brett Anderson <[EMAIL PROTECTED]> To: UUC Digest <bmwuucdigest@uucdigest.com> Subject: Re: [bimmerheads] BMP plastic pulley warning Valid?? Message-ID: <[EMAIL PROTECTED]> To date, we've had a 98 528i that lost it's power steering pulley, broke in 3. Pulley had obvious signs of distress from being dropped or worse, and it failed about 4 minutes after being removed, and re-installed. We've also seen some M52/M54 alternator idler and tensioner pulleys that have come in with the belt running directly on the bearing, after the plastic wheel has disappeared. We see a lot of cars, so these few failures that we have seen are showing the problem to be very rare. Brett Anderson KMS-Koala Motorsport www.bmwdiffs.com (440) 564 7574 9988 Kinsman Rd Novelty, OH 44072 (Near Cleveland) [EMAIL PROTECTED] wrote: > We've never seen one fail in my shop.. 4 years and counting. > > Jon > ______________________________________________ ------------------------------ End of [bmwuucdigest] digest(2 messages) **********
