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timing chain replacement question

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timing chain replacement question

PostAuthor: Crazy_Russian » Sun Jan 07, 2018 10:48 pm

Does anyone know if the timing chain can be replaced without taking off the heads?
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Re: timing chain replacement question

PostAuthor: aart » Mon Jan 08, 2018 4:41 am

Yess it's possible, but make sure to keep an eye on all timing marks.

Also rotate crankshaft by hand few times after replacing chain. This is to check for problems like valves hitting pistons etc.

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Re: timing chain replacement question

PostAuthor: drainplug » Mon Jan 08, 2018 1:06 pm

My brother was a mechanic at a Mercedes-Benz dealership several years ago.
During that time Mercedes had a problem with the timing chains on their engines and under warranty they would replace the chains.
The shop time was something like 6-8 hours to do the work.
My brother being resourceful figured if he used a chain breaker and a master link he wouldn't need to pull the head to do the work.
Corporate caught on after a half dozen or so cars, watched how he did it and changed the shop time to 2-3 hours.

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Re: timing chain replacement question

PostAuthor: bstig60 » Mon Jan 08, 2018 5:10 pm

aart wrote:Yess it's possible, but make sure to keep an eye on all timing marks.

Also rotate crankshaft by hand few times after replacing chain. This is to check for problems like valves hitting pistons etc.

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aart: If its possible to replace the timing chains without removing the heads, I would like to see the procedure......
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Re: timing chain replacement question

PostAuthor: uncleromo » Mon Jan 08, 2018 8:56 pm

Not to be argumentative, but I seriously doubt it. Cam chains have no master link. I have tried, without success to remove and replace the lower cam drive gear without lifting the cylinder (jug). I can’t do it. I suppose you can cut the old chain off, but the gear must be removed to install the new cam chain.
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Re: timing chain replacement question

PostAuthor: bstig60 » Tue Jan 09, 2018 1:09 am

That's why I asked for the procedure. To my knowledge there is not way to replace the cam chains without removing the head, jug and crankcase covers. Unless there is a problem with the cam chain that causes it to jump time, I would replace or at least adjust the cam tensioners to the proper setting and run them. To my knowledge I have never had a problem with a cam chain wearing out, albeit, I have had to replace the tensioner on one or two engines in the past.
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Re: timing chain replacement question

PostAuthor: nanno » Tue Jan 09, 2018 2:10 am

It can be done, but it's rather pointless as you end up with a rivetted link on a Hyvo-type-chain and that's a no-no.
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

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Re: timing chain replacement question

PostAuthor: Crazy_Russian » Sun Jan 14, 2018 5:49 am

well, just wasted several hours playing with the timing chain on #1.... there is no way to sneak it out without breaking the chain or taking the heads off. a bit frustrating... but you can replace the slider on the tensioner side, but its a royal PITA to get the locating pin back in...
:wacko:
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