Engine: B5244: Cam Timing

[mikehcarr]

I am a little puzzled as to how to reset the cam timing after reinstall action of the camshafts. Am I right in thinking that everything is set up correctly if the slots on the camshaft are in line, the marks on the camshaft sprockets line up with those on the cover and number one cylinder is at TDC?

[DieselDoNicely]

I use the cam locking and crank locking tool from Volvo, the rest is too big a risk and the car is then scrap.

DDN

[Clan]

Originally Posted by mikehcarr

I am a little puzzled as to how to reset the cam timing after reinstall action of the camshafts. Am I right in thinking that everything is set up correctly if the slots on the camshaft are in line, the marks on the camshaft sprockets line up with those on the cover and number one cylinder is at TDC?

No , No and No !

The slots have to be in the volvo tool to line them up perfectly , it has to be perfect , even 1/2 a degree out isnt good enough . Yes they do appear to be in a straight line but you will notice they are off-set .

Once you take the cam pulleys off those marks are meaningless . you can try and get them to line up as best you can when reassembling .. using the prescribed method and order

The crankshaft isnt at TDC in the correct position , it is a safe position with all the pistons part way down the bore so you can turn the camshafts .

Best leave it to the experts ...

[mikehcarr]

Thanks guys, you've convinced me of the need to fork out for the crank and camshaft location tools. I notice that KMS Direct do a set including the cam cover wind down tool for a reasonable price.
Am now wondering if the reason for rough running was the fact that the exhaust cam had slipped in relation to its pulley as it appeared to be a couple of teeth out (retarded), rather than the burnt valve which I had presumed it to be. Will do a pressure check on the cylinders before removing the head.

PS. Ref "Clan's" comment "Best leave it to the experts ..." I thought the whole point of forums such as these was to assist enthusiastic amateurs in solving problems. In 45 plus years of car ownership I have never entrusted my vehicles to so called "experts".

[TXC]

I've not stripped the sprockets off of one of these, but I'm guessing by what Clan has stated, the pulleys 'freewheel' therefore they represent no value in terms of the actual timing, simply as reference points when timing the engine up on belt replacement.

Loosening the sprockets without the shafts locked will risk a mistimed engine (you know this). It sounds like you have the whole shooting match apart anyhow, so you may well need the wind down kit, or MAKE ONE! *Cue A-Team music.