Click to go to Forum Home Click to go to maXbimmer Home

Go Back   maXbimmer Forums > maXimum Tech > 3 Series > E30 (1983 - 1991)
User Name
Password


Welcome to Maxbimmer.com!

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

Reply
 
Thread Tools Rate Thread Display Modes
Old 11-09-2010, 06:10 PM   #1
groovy325
1st Gear Newbie
 
Join Date: May 2010
Location: Canada
Posts: 20
altennator/water pump belt

I recently replaced my altenator belt, in about 3 weeks of driving it snapped, so i put my old belt back on and in about a week it snapped, the pulleys all spin freely. Any hints on what i should check?
groovy325 is offline   Reply With Quote
Old 11-09-2010, 06:18 PM   #2
El Gato Liso
6th Gear Member
 
El Gato Liso's Avatar
 
Join Date: May 2007
Location: Brampton
Posts: 3,124
check for any sharp spots on the pullies.

also make sure nothing is rubbing the belts...

thats pretty much it i suppose.
__________________
R.I.P. E30
El Gato Liso is offline   Reply With Quote
Old 11-09-2010, 06:23 PM   #3
E30M42cab
Parts Hoarding Specialist
 
E30M42cab's Avatar
 
Join Date: Apr 2006
Location: Milton
Posts: 2,333
Putting it on too tightly? Check to make sure something like your alternator bracket isn't looks. I've had a bracket break on me which cuts the belt because the sprockets don't line up properly any more.
__________________

Quote:
Originally Posted by richie_s999 View Post
Grow up and move on.
E30M42cab is offline   Reply With Quote
Old 11-10-2010, 01:21 AM   #4
davericher20
black and blue
 
davericher20's Avatar
 
Join Date: Dec 2006
Location: 2 storey 3 bedroom 1 car garage
Posts: 3,598
^^ +1 too tight should be a 1/4 inch of play (pressing down on the belt shouldn't exceed 1/4 inch) if that makes sense.

Anyone else?
__________________


Quote:
Originally Posted by JINT View Post
Some people have serious track experience from the cruise, so what is fast to you, isn't fast to them.
davericher20 is online now   Reply With Quote
Old 11-10-2010, 01:47 AM   #5
Ceeker
Parts hoarding partner...
 
Ceeker's Avatar
 
Join Date: Nov 2007
Location: Toronto
Posts: 3,384
^^^+2 an over tightened belt can easily snap after some time. Also, over tightening a belt - typically the alt belt can lead to premature wearing of the alt bearing. make sure your alt bearing is spinning freely and the pulleys are lining up as suggested. This can also make the belt snap if there is resistance.
__________________

I think I've had 14 bmw's in 4 years.
2 IX's -sold and parts
2 325i 4 dr - sold
4 318is all white - sold and parts
1 87 325is red - parts
1 89 325i vert grey - parts
1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
latest addition 1 92-318i vert - blue - parts
latest addition 1 87 325is blk - parts.

latest addition as of 2013-Gold 87-325is auto! it's a keeper!
Ceeker is offline   Reply With Quote
Old 11-11-2010, 07:52 PM   #6
groovy325
1st Gear Newbie
 
Join Date: May 2010
Location: Canada
Posts: 20
Thanks guys, i'll check the list.
groovy325 is offline   Reply With Quote
Old 11-11-2010, 09:11 PM   #7
overlordjd
2nd Gear Member
 
Join Date: Apr 2008
Location: Toronto
Posts: 142
bad bearings on the alternator or waterpump can cause small wobble causing the belt to be cut by the outer edges of the pully.
overlordjd is offline   Reply With Quote
Old 11-15-2010, 10:56 AM   #8
groovy325
1st Gear Newbie
 
Join Date: May 2010
Location: Canada
Posts: 20
How can i test for play in the bearings?
groovy325 is offline   Reply With Quote
Old 11-15-2010, 11:07 AM   #9
overlordjd
2nd Gear Member
 
Join Date: Apr 2008
Location: Toronto
Posts: 142
if the belt is currently off then you should be able to feel some play when you try to move the pully from side to side. When my waterpump bearing went, it was very obvious and I was able to feel the vibrations created when the car was running.
overlordjd is offline   Reply With Quote
Old 11-15-2010, 11:38 AM   #10
groovy325
1st Gear Newbie
 
Join Date: May 2010
Location: Canada
Posts: 20
No play, i'm just going to adjust all the pulleys and try a new belt.
groovy325 is offline   Reply With Quote
Old 11-15-2010, 12:07 PM   #11
craigIS
A.K.A. crossfire291
 
craigIS's Avatar
 
Join Date: Feb 2007
Location: Chatham
Posts: 2,044
Send a message via MSN to craigIS
Same thing just happened to me. I had my friends shop put the belt on. His boss did the work since I ordered from them. First the belt was loose, and slipping still, then my friends boss tightened the belt. 3 weeks after the belt was tightened it snapped. I suspect it was tightened too much. No one will admit it though.
__________________


flickr
craigIS is offline   Reply With Quote
Old 11-15-2010, 07:15 PM   #12
E30M42cab
Parts Hoarding Specialist
 
E30M42cab's Avatar
 
Join Date: Apr 2006
Location: Milton
Posts: 2,333
Quote:
Originally Posted by overlordjd View Post
if the belt is currently off then you should be able to feel some play when you try to move the pully from side to side. When my waterpump bearing went, it was very obvious and I was able to feel the vibrations created when the car was running.
Bearings are a questionable problem for belts to snap really. Like you said, you could feel the vibration, not to mention if the water pump gets that bad, you should be losing coolant slowly at that point as it will be bleeding. If your bearings in your Alternator were that wobbly, you'd hearing it loud and clear.

Your other possibilty could be the alternator bushings being worn out and allowing vibrations.
__________________

Quote:
Originally Posted by richie_s999 View Post
Grow up and move on.
E30M42cab is offline   Reply With Quote
Old 11-16-2010, 12:53 PM   #13
everlast
if I lived . I would be ~
 
everlast's Avatar
 
Join Date: Mar 2004
Location: Ottawa
Posts: 5,847
If one of the items is out of alignment, ie a bracket is bent, it will eat belts. Something else to check.
__________________
everlast is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -4. The time now is 03:38 PM.


Powered by vBulletin® Version 3.8.1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Maxbimmer Copyright 2001 - 2014