Death-to-a-cam
Discussion
Picture says all really!
In for a 12k, was working through valve adjustment and found this.
Engine has been "rebuilt" but a retaining spring/washer has either been omitted completely or its fallen off. Latter seems unlikely.
Potential engine death in the making, caught in the "not toooooo late stage"
In for a 12k, was working through valve adjustment and found this.
Engine has been "rebuilt" but a retaining spring/washer has either been omitted completely or its fallen off. Latter seems unlikely.
Potential engine death in the making, caught in the "not toooooo late stage"
Ah of course, couldn't remember if it was meant to be a spring or a washer/shim.
Can't quite get the angle, but there is an obvious gap between the finger follower and the head, meaning it can move side to side about 5mm.
Your pic shows no gap and thus no movement and therefore correct! Will try to get a better pic tomorrow with a mirror.
Can't quite get the angle, but there is an obvious gap between the finger follower and the head, meaning it can move side to side about 5mm.
Your pic shows no gap and thus no movement and therefore correct! Will try to get a better pic tomorrow with a mirror.
Edited by tofts on Wednesday 9th November 23:05
Im looking at the whole valve train now, and its clear that there could be problems down the road.
Just replacing the cam with a single follower is not an ideal choice, as its probably going to knock the new cam out or kill the old followers. Theres movement in the valves and thus play in the guides, which would explain the fouled plug on no5. The exhaust cam isn't looking so pretty, I'm fairly certain that the rebuild consisted of reusing as many parts as possible. Now some of those parts have nearly 70000 miles on them! Most of the measured inlet valves are very tight 2-4 thou so it suggests stretched valves or lots of valve wear, either way new valves.
It needs a head overhaul but I'm not sure its going to be within the budget of the owner at this time. Its a shame really as now I have sorted out the other bits and bobs the car is quite sound. It even ran quite well apart from an odd high pitched "tinging" I noticed. Exceedingly subtle, but noticeable if you listen to a lot of these engines.
It only came in for a quick 6k service, but after I pointed out some issues the owner asked to upgrade to a 12k. You have to wonder how much longer it would have lasted!
Jody
Just replacing the cam with a single follower is not an ideal choice, as its probably going to knock the new cam out or kill the old followers. Theres movement in the valves and thus play in the guides, which would explain the fouled plug on no5. The exhaust cam isn't looking so pretty, I'm fairly certain that the rebuild consisted of reusing as many parts as possible. Now some of those parts have nearly 70000 miles on them! Most of the measured inlet valves are very tight 2-4 thou so it suggests stretched valves or lots of valve wear, either way new valves.
It needs a head overhaul but I'm not sure its going to be within the budget of the owner at this time. Its a shame really as now I have sorted out the other bits and bobs the car is quite sound. It even ran quite well apart from an odd high pitched "tinging" I noticed. Exceedingly subtle, but noticeable if you listen to a lot of these engines.
It only came in for a quick 6k service, but after I pointed out some issues the owner asked to upgrade to a 12k. You have to wonder how much longer it would have lasted!
Jody
Edited by tofts on Thursday 10th November 12:45
m4tti said:
What makes you think those valves have stretched rather than the seats worn.
Rang up powers this morning just to get an idea on parts cost, happened to be Dom who answered. It was his suggestion on the stretched valves, its a very early engine, looks to have original cams etcEdited by m4tti on Thursday 10th November 14:35
Andy_mr2sc said:
Yes YouTube is a great resource for listening to engines....
Text can come across differently to how its meant, but it does seem like your inferring I don't know how the engine should sound...
In addition to the above, I have in the other unit a 4.7 Cerb, 350i and supercharged Griffith.
Edited by tofts on Thursday 10th November 15:44
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