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E34 (1989 - 1995)

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  #1  
Old 10-16-2011, 12:10 PM
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Mein Auto: 91 BMW 525i 72 VW Variant
Need M50B25 Information

Is the M50B25 a Non Interference Engine?
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(1991 BMW 525i 260,XXX miles)
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  #2  
Old 10-16-2011, 01:27 PM
robertobaggio20 robertobaggio20 is offline
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Quote:
Originally Posted by DLS_91_525i View Post
Is the M50B25 a Non Interference Engine?
Its an interference engine.

Almost all bmws are high compression engines, compared to japanese ones. They squeezed the combustion chamber a tad smaller to make for a bigger explosion, but at the risk of the valves banging the pistons if they are not properly timed and controlled by the timing belt/chain.

I had a friend's m20's timing belt snap and the entire engine went.
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Old 10-16-2011, 02:14 PM
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Well being the M50 has a timing chain running between the cams and one running from one cam to the crank what is recommend mileage to change them?
What is the chances of one failing?
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Old 10-16-2011, 07:53 PM
robertobaggio20 robertobaggio20 is offline
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Timing chains have never been known to fail. I guess what you ought to do is to take a look at them, if you are doing any major work on your engine. If your gut tells you that they ought to be changed, then do so. The actual chains themselves are cheap even when new, but the labour involved is pricey, and usually you're doing some major upgrade or overhaul to the engine anyway.

But the chains do not need to be changed unless there is visible damage.
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Old 10-16-2011, 09:14 PM
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Labor is not a problem here, I have no fear of changing the timing chains myself. I have done several dual over head cam engines with timing chains but the design of M50B25 timing chain set up is practically fool proof. If you just replace one chain at a time there is no way you could get the timing off. Put a few timing marks on the timing gears of the cams and on the crank gear and just line the new chains up with that.
Simple enough right?
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Old 10-16-2011, 09:55 PM
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Quote:
Originally Posted by DLS_91_525i View Post
Labor is not a problem here, I have no fear of changing the timing chains myself. I have done several dual over head cam engines with timing chains but the design of M50B25 timing chain set up is practically fool proof. If you just replace one chain at a time there is no way you could get the timing off. Put a few timing marks on the timing gears of the cams and on the crank gear and just line the new chains up with that.
Simple enough right?
You're the man bro.

Don't bother to change the chains. Change the valve cover gasket (vcg). Speak to rick5series about how to install it correctly with sealant placed in all the correct places and quantities.

Are you going to do a top overhaul on your engine?
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Old 10-16-2011, 09:59 PM
robertobaggio20 robertobaggio20 is offline
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If you're going to do a top overhaul, why don't you take the opportunity to hot cam your engine? Plonk some M3 camshafts in there, and enjoy a greater top end power. Will cost you around $300 shipped for the camshafts. Might take you up to 2 months to find a pair, they go pretty quickly.
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  #8  
Old 10-16-2011, 10:36 PM
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When I start top end work it will be when I get ready to install my turbo set up, I will be replacing the timings chains, the head gasket, intake gasket, exhaust gasket, valve cover gasket along with head studs
I'm sure I am forgetting something, but you get where I am going with that.
I have seen the cam upgrade talked about in many threads on here, but I do not see enough power increase to spend the money on the cams when I could put that money toward a turbo to build more power. Maybe later down the road if I do not feel the top end is where I want it.
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  #9  
Old 10-17-2011, 12:52 AM
robertobaggio20 robertobaggio20 is offline
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OH yeah....get a reliable torque wrench. Important. And test it to make sure it works reliably.
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  #10  
Old 10-17-2011, 06:31 AM
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Oh! most definitely! I have a 3/8 and a 1/2in drive torque wrench! and there dead on the money when it comes to torque specs!
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