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Timing Chain :(


pisgahlvr

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Maybe your shop is referring to the repair manual where's written: drag out the engine, take off head and pan and replace chain and both cogs.

If you've got a tool like this:

 

post-42081-0-09033200-1425067389_thumb.j

 

you can open the old chain, attach the new one to it by a chain lock, push the car a couple of yards, take the old chain away and close the new one by the lock. Add valve cover- finished, if your cogs aren't too bad.

 

Hen

 

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What sort of experience does this shop have with these engines?

 

I remember one old timer on here saying he has never seen a timing chain actually fail on an m10.

 

A new one might make your spark a little more accurate, but a new distributor would likely be a bigger improvement.

I would rather spend money on a new distributor.

 

I think I would be taking my car home now, or to another shop; as stated above, for a second opinion.

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What was the complaint when you took it to the shop?  As stated above in 42 years of playing with M10 powered BMW's including some very high HP race engines I have NEVER seen a chain fail.  If it has stretched so much the tensioner can't keep it tight the pulleys are probably worn enough a new chain will only partially solve the problem.  If it is that tired my guess is the rest of the engine is not far behind,  I would wait and save up some $$$ and freshen the entire engine (rings, bearings, valve job at the min)  that $1000 is about half way there. 

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What was the complaint when you took it to the shop? As stated above in 42 years of playing with M10 powered BMW's including some very high HP race engines I have NEVER seen a chain fail. If it has stretched so much the tensioner can't keep it tight the pulleys are probably worn enough a new chain will only partially solve the problem. If it is that tired my guess is the rest of the engine is not far behind, I would wait and save up some $$$ and freshen the entire engine (rings, bearings, valve job at the min) that $1000 is about half way there.

Sorry I should have clarified. The chain did not break, it's just very loose. The engine has a brand new carb, new wires, plugs, cap, a pertronix, and the timing is more or less dialed in. But they are saying that because the timing chain is so loose, they can not get the engine to time.

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I have not clarified any of that with them yet. Mainly because it is a busy shop with a fantastic reputation so getting the owner on the phone was a little tough. I did explain to them everything that i have replaced thus far. And the owner explained to me that their 2002 tech is highly experienced on them. I did A LOT of searching around the Charlotte area looking for a shop that I felt was "the right one". I felt this one was the best choice to avoid having to transport the car up to Korman in Greeneville.

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$1000 bucks to do the timing chain?! That's down right funny right there! It's a few hundred in parts yah if you're getting all new gears, but I wouldnt say $1000 bucks! Then again I do all my work so I'm a cheapo... But it sounds pretty high to me.

Lol well it sounds high to me too. But I've never changed a timing chain. I wouldn't have the slightest idea how to change one. Are you close to Charlotte? Perhaps you could help me?

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Yes a loose timing chain can cause as much as a 5-8 deg timing variation when you are at certain engine speeds (the chain goes through harmonic phases like plucking a low string on a bass) my question is what kind of shape is the engine in? How many miles? Have they done a compression test and leak down? It sounds like you are bolting on all sorts of new parts on the outside without knowing what's inside. "Putting a new saddle on a dead horse makes him look better but doesn't make him run any faster"

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