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E34 (1989 - 1995)

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  #1  
Old 06-05-2011, 07:04 PM
south26 south26 is offline
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reasons to change your timing belt on a m20

Hi, I was taking a head off a m20 from a e34. I bought the car to part out. I was told that it had a blown head gasket. Well I have never seen a gasket go like this. I did not count but a number of rockers broke. 6 valves broke, one stuck in a piston. 4 out of the 6 pistons had holes in them.




















Remember change your timing belt.


Andy
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Last edited by south26; 06-05-2011 at 07:08 PM.
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  #2  
Old 06-05-2011, 07:52 PM
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Yes i think thats good advise.That a lot of damage for one event. I can only imagine the sound that made. good pics too. I have two m50 h/g blown engines on Dolly's for the day i decide to rebuild one.
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  #3  
Old 06-06-2011, 03:31 PM
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Wow, that's comprehensive. Bad head gasket, yyea. Perhaps mail a valve head to the seller
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  #4  
Old 06-06-2011, 04:55 PM
gomfrddy gomfrddy is offline
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Quote:
Originally Posted by luckydog View Post
Yes i think thats good advise.That a lot of damage for one event. I can only imagine the sound that made. good pics too. I have two m50 h/g blown engines on Dolly's for the day i decide to rebuild one.
it sounds like a miniature machine gun or sewing machine....ratatatatatatatatata
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  #5  
Old 06-06-2011, 07:49 PM
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  #6  
Old 10-16-2011, 08:56 AM
south26 south26 is offline
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Reason to change your timing belt.


Andy
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  #7  
Old 10-16-2011, 12:30 PM
robertobaggio20 robertobaggio20 is offline
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Quote:
Originally Posted by ross1 View Post
Wow, that's comprehensive. Bad head gasket, yyea. Perhaps mail a valve head to the seller
Hi Ross ole' buddy ole' pal !! How are you ??? Have a lovely day !!
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  #8  
Old 01-22-2013, 03:22 PM
south26 south26 is offline
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Hi, I thought I would bring this back for those with a m20.


Andy
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  #9  
Old 01-22-2013, 04:22 PM
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Ahhhh .... the joys of an interference engine with a timing belt (that is not properly maintained/changed out)
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  #10  
Old 01-22-2013, 08:33 PM
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reminds me i have to do the one on my M40 in my 3er sometime in the next 6 months. ergh. its not a difficult task on either, ive done it several times, but just so time consuming!
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  #11  
Old 01-23-2013, 06:32 PM
south26 south26 is offline
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but not doing it is some much more time consuming.


Andy
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  #12  
Old 01-23-2013, 11:43 PM
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not a true-er word was said
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  #13  
Old 10-09-2013, 06:22 PM
south26 south26 is offline
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Just a friendly reminder to those of us with a m20.


Andy
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  #14  
Old 10-10-2013, 05:30 AM
MustangAndy MustangAndy is offline
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Quote:
Originally Posted by south26 View Post
Just a friendly reminder to those of us with a m20.


Andy
Does this apply to the M30s as well?


_
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  #15  
Old 10-10-2013, 07:26 AM
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Thats what costed me my first car and second car.. Cruising along then all the sudden SNAP!

Time for a new car.. Hadnt gottn into swapping yet.. Seemed to hard back then lol
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  #16  
Old 10-10-2013, 04:10 PM
south26 south26 is offline
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Quote:
Originally Posted by MustangAndy View Post
Does this apply to the M30s as well?


_


Nope the m30 has a chain. Only the 89-90 525i has the m20.


Andy
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  #17  
Old 01-04-2015, 07:23 PM
south26 south26 is offline
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Bump to help with reasons to change your timing belt.


Andy
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  #18  
Old 07-10-2016, 07:07 PM
south26 south26 is offline
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For those new people that have not seen what happens when you forget to change your timing belt.


Andy
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  #19  
Old 07-17-2016, 06:33 AM
aliff01 aliff01 is offline
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Actually do all m20 engines use timing belts rather than chains?
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  #20  
Old 07-17-2016, 12:29 PM
south26 south26 is offline
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Yes all m20 use a belt.


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  #21  
Old 07-17-2016, 07:46 PM
aliff01 aliff01 is offline
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How many kilometers would a new one last before it snaps and what are the signs of it needing a replacement?
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  #22  
Old 07-18-2016, 06:28 AM
south26 south26 is offline
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No signs, just breaks. In miles it is every 60,000 miles or 4 years. If sitting for 6 years and only has 10,000 miles it should be changed.


Andy
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  #23  
Old 07-19-2016, 07:56 PM
BMW_507_4ME BMW_507_4ME is online now
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Belt/ chain

As all know BMW used a timing chain in most motors. Even the chain can be a disaster if you don't keep up with the tensioners. The M50's had a double roller timing chain with a mid engine gear on a bearing to take the stress of the chain. My 740IL didn't have that gear, instead, BMW just used plastic chain guides and as such, many failed as a result. BMW must have saved hundreds per car, but their customers (and reputation) lost thousands. I am sure they saved a few bucks using a belt on the M20's also. My advice is to change your tensioners and / or belt often, even more often then you might think you might need too, cheap insurance IMHO
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  #24  
Old 07-19-2016, 08:35 PM
south26 south26 is offline
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Originally Posted by BMW_507_4ME View Post
As all know BMW used a timing chain in most motors. Even the chain can be a disaster if you don't keep up with the tensioners. The M50's had a double roller timing chain with a mid engine gear on a bearing to take the stress of the chain. My 740IL didn't have that gear, instead, BMW just used plastic chain guides and as such, many failed as a result. BMW must have saved hundreds per car, but their customers (and reputation) lost thousands. I am sure they saved a few bucks using a belt on the M20's also. My advice is to change your tensioners and / or belt often, even more often then you might think you might need too, cheap insurance IMHO
I think you might be over stating the fact about the chain. It is not a common problem and yes can happen but not likely. As to saving hundreds? The m20 with the belt was built to be less of a gas hog compared to the m30, which it was. The belt was suppose to deal with the closer specs compared to the 60s tech that made the m30. I have driven a car with the m30 and have never worried about the chain. I have parted 26 BMWs and have never parted one because of a failed chain., 5 of those had a failed belt. So yes a chain guide can fail but not likely.


Andy
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  #25  
Old 07-19-2016, 09:09 PM
BMW_507_4ME BMW_507_4ME is online now
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Belts VS Chains

Well, you missed my point. It was that chains are much better "IF" properly maintained and don't suffer from a poor design. But I am sure after junking so many BMW's you already know what the major design timing chain flaw was in the M60 0ver the M50. I only have 40 years of fixing and racing cars and bikes under my belt, junking must be much harder and I am sure you learn more by tacking one apart, then by making them run, thanks for setting me strait, I will junk my car tomorrow
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