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Camshaft replacement

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addy:
I am refitting the exhaust and inlet cams, Haynes manual says make sure No1 cylinder lobe is up, when I do that timing marks will be out The writeup off this Site for Headgasket replacement says put them at TDC, I cannot get them to stay at TDC. I never removed cam sprockets so they are correct. Also removed cams one at a time, along with carriers, and wrapped in seperate marked boxes, so not wrong way round. Here is a pic of exhaust Timing mark position now against rocker cover. Could it have something to do with me cleaning out the lifters, they do compress and spring, they also went back into the places they came from. Can anyone see anything I have missed or should it do this? Thanks for any help, it's driving me mad  :'(

Exhaust timing marks.


No1 lobe of Exhaust cam


exhaust cam

Doctor Gollum:
Is the cam pulley correctly oriented?

I believe that it is possible to refit it 180 degrees out...  :-\

Kevin Wood:
Firstly, make sure the crank is turned back to 90 degrees before the TDC timing mark to ensure you don't damage anything while fitting the cams.

You will need to turn them to the TDC mark and then lock them in place. Do you have the locking tool used for cam belt replacement. If not, I would get one before proceeding further.

Often there are flats on the camshafts that you can place a spanner on in order to hold them in place. The valve spring tension will act on the lobes and cause them to try to move, so maybe get an assistant to slip the locking key in while you hold the two cams in place with a pair of spanners?

If you haven't removed the sprockets, it strikes me that you won't be able to correctly reinstall the camshaft seals?

Once you have the cams locked at the TDC position, then carefully turn the crankshaft up from the 90 degree before TDC position until the TDC mark lines up, then proceed to install the cam belt as you would when changing the belt.

Kevin Wood:
I should have said, regarding the Haynes advice regarding cam lobe position, it's best to ignore it.

The TDC markings are the correct reference, and these occur when no.1 cylinder is at TDC at the end of the compression stroke. This means that on No. 1 both cam lobes should be away from the followers (but neither will be straight up!), and, on No. 4, both lobes should be partially acting on the followers (inlet opening and exhaust closing).

dave the builder:
Just to add....
when you had the lifters apart ,you just gave them a smear of oil or assembly lube right  :-\
not filled them with oil  :o
(they fill and adjust on he first start up) which always makes a horrific sound like you left half a socket set inside the engine .but once filled with oil (and you've changed your pants) all is good  :y

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