Remembering why I
dislike working on
AO Silver Member
Join Date: Sep 2001
As well as severe cam lobe and follower wear on the exhaust lobes, (inlets usually fine), you can also get bad wear on the ends of the rockers at the valve tips, which makes setting the tappets awkward. I used to adjust at the valve rather than the cam anyway (multiply spec by 1.4 to get clearance at valve) as I found it more accurate, but it's quite possible the engine also wants the rockers refacing. To set inlet and exhaust clearances can be quite time consuming and shims are hard to come by these days, so €400 maybe isn't as bad as it seems at first. Just setting exhaust clearances shouldn't take more than a few hours including strip and reassemble I don't think.
If it had new cams and a full set of 12 followers, then €2000 isn't too far off the mark as that's a lot of expensive parts. Work wise, it's not actually much more than simply setting the gaps, as you need to remove the cams to change inlet shims anyway.
One other potential issue is if the exhaust followers and lobes were really bad, the bores that the followers run in can go out of round.
Rocker shafts can wear too, again, making proper setting almost impossible. Same deal with cam bearings too if its bad.
The symptoms now sound like the gaps are too small and it's blowing past the valves. Do a compassion check to make sure this isn't happening or it'll burn the valves in short order.
Injectors do tick, but with stock cams and all as it should be, the valve gear shouldn't be too noisy, although it'll never be silent. Best case and you get a gentle mechanical purr. Worst case and it sounds like a bag of spanner s in a tumble dryer. I've had both sorts!
Hope that helps a bit.
Last edited by ChrisS; 02-07-13 at 05:35.
Reason: Corrected myself about where to set gaps