timing chain replacment
#1 timing chain replacment
Hi is it possible to change the timing chain on a V12 without removing cylinder heads.
Rob Gill.
Rob Gill.
v12 etype 2+2
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#2 Re: timing chain replacment
Simple answer yes. Join it to the old chain and feed it through carefully.
Mark Brown
1971 S3 Etype, now sold, sadly.
1971 S3 Etype, now sold, sadly.
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#3 Re: timing chain replacment
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
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
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#4 Re: timing chain replacment
I would be changing the tensioners / guides etc.
would it be wise to have join in the chain? .
Rob.
would it be wise to have join in the chain? .
Rob.
v12 etype 2+2
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#5 Re: timing chain replacment
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
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
Mark Brown
1971 S3 Etype, now sold, sadly.
1971 S3 Etype, now sold, sadly.
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#6 Re: timing chain replacment
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.
thanks
Rob.
v12 etype 2+2
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#7 Re: timing chain replacment
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
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
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#8 Re: timing chain replacment
Hi Marek, with the timing chain cover off the top of the tensioner is not visable.
(where it locates)
Thanks Rob.
(where it locates)
Thanks Rob.
v12 etype 2+2
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#9 Re: timing chain replacment
Hi Marek does does the cam cover have to be removed?.
Thanks again Rob.
Thanks again Rob.
v12 etype 2+2
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#10 Re: timing chain replacment
Have to be removed for what?
kind regards
Marek
kind regards
Marek
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#11 Re: timing chain replacment
Hi Marek,
does the cam cover have to be removed to enable you to see where the top of the tensioner locates?
Thanks Rob.
does the cam cover have to be removed to enable you to see where the top of the tensioner locates?
Thanks Rob.
v12 etype 2+2
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#12 Re: timing chain replacment
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
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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