timing chain replacment

driver · Post by **driver** » Sat Mar 07, 2020 4:13 pm

Hi is it possible to change the timing chain on a V12 without removing cylinder heads.
Rob Gill.

42south · Post by **42south** » Sat Mar 07, 2020 5:28 pm

Simple answer yes. Join it to the old chain and feed it through carefully.

MarekH · Post by **MarekH** » Sat Mar 07, 2020 6:36 pm

If you do it that way, you'll need to take the A cam cover off. Any other roll-it-around option sees you turning the engine the wrong way and/or fighting the tensioner tension.

If you are considering changing the tensioner aswell, then you'll need to strip the front off and lower the sump as a minimum.

kind regards
Marek

driver · Post by **driver** » Sat Mar 07, 2020 8:23 pm

I would be changing the tensioners / guides etc.
would it be wise to have join in the chain? .
Rob.

42south · Post by **42south** » Sun Mar 08, 2020 4:17 am

So if doing all that work, follow Marek’s advice, take off bonnet, remove radiator, cam covers etc and take off the front cover.
A joined chain is no issue, just get the joiner going in the right direction.
Do a search, and there are plenty of threads on the issue
Cheers

driver · Post by **driver** » Thu Apr 16, 2020 7:28 pm

HI ,when changing the tensioner without moving the cylinder head how is it possible to see where to locate the top part of the tensioner?
thanks
Rob.

MarekH · Post by **MarekH** » Thu Apr 16, 2020 9:03 pm

Dear Rob,

Changing the tensioner is different from your original question - changing the timing chain.

To change the tensioner, you have to take the timing cover off. You can see the whole front of the engine when you do that.

kind regards
Marek

driver · Post by **driver** » Fri Apr 17, 2020 5:25 am

Hi Marek, with the timing chain cover off the top of the tensioner is not visable.
(where it locates)
Thanks Rob.

driver · Post by **driver** » Fri Apr 17, 2020 5:32 am

Hi Marek does does the cam cover have to be removed?.
Thanks again Rob.

MarekH · Post by **MarekH** » Fri Apr 17, 2020 8:15 am

Have to be removed for what?

kind regards
Marek

driver · Post by **driver** » Fri Apr 17, 2020 8:37 am

Hi Marek,
does the cam cover have to be removed to enable you to see where the top of the tensioner locates?
Thanks Rob.

MarekH · Post by **MarekH** » Fri Apr 17, 2020 9:25 am

No, and the top of the chain tensioner doesn't locate anywhere anyway. It simply hangs in mid air and there is almost enough space down at the front of the cylinder head to put your hand in once the cam sprocket is out of the way.

Where you sound like you are trying to go with this is "Can I change the timing chain and the tensioner without taking either a cam cover or cylinder head off?"

A new timing chain is not going to be as flexible laterally as an old one. (Think changing gears on a bicycle - the chain has to flex from left to right to reach the high to low gear spread.)

You are going to have to remove the old tensioner whilst the chain is in situ with the chain master link visible against the tensioner, join in the new chain with it hanging under the engine from the front, wind it round, rejoin it and then fit the new tensioner on its mounting dowel by the crank.

I haven't tried that.

You can easily judge if that is possible once you have the timing cover off.

Changing the tensioner is way more time consuming than merely changing the chain as taking the front of the engine off is far more involved than lifting off twin carburettors/water jacket and black manifolds all as a single item and lifting them up and over out of the way to give the required access to the left hand cam cover.

kind regards
Marek

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