Tappet Adjustment
Discussion
Should be done at every 12k service, I've just done mine, and found that all the exhausts were fine.
However all the inlets were about 2 or 3 thou, whereas the factory says 8.
The gaps will never get larger due to valve stem stretch, which by 30,000 they should've stopped.
Joolz has a special tip about them, but I'm sworn to secrecy
However all the inlets were about 2 or 3 thou, whereas the factory says 8.
The gaps will never get larger due to valve stem stretch, which by 30,000 they should've stopped.
Joolz has a special tip about them, but I'm sworn to secrecy
yiw1393 said:
Minor hijack.........
Why is the adjustment so expensive to have done? Is it so very much different to 'normal' cars?
Hijack over
I have a vested interest, because of the impending arrival of a Cerb
I wondered about this too. As far as I could tell (and I'm sure others will correct me on this), it depends who you get to do it. If you go to a main dealer they have a fixed price (seems around the £250 mark) based on the assumption that they will adjust them all and they charge a fairly high price for labour. If you use an independent (like APM who did my 36000 service, including tappets - and did an excellent job, thanks Andy) you will get better value as you will only pay for what gets done.
rev-erend said:
I think it's because they are 'bucket and shim'.
You measure all the gaps - then take all cam train
apart - measure shim - fit new correct size shim.
Replace cam train.
Measure all gaps and hope you got it right.
A more complicated version of the old BL 'B' series engines then? It's got to be more than that surely? I've heard horrendous prices for a tappet adjust - £400+
Or is it more akin to a top end rebuild (unlike the BL motor)?
rev-erend said:
I think it's because they are 'bucket and shim'.
You measure all the gaps - then take all cam train
apart - measure shim - fit new correct size shim.
Replace cam train.
Measure all gaps and hope you got it right.
Hope you got it right is spot on!!! Took me 3 attempts to get em right, wanted them exact though, even a thou out wasn't good enough!!!
On the 4.2 it involves remove the inlet manifolds too.
crazycats said:
Should be done at every 12k service, I've just done mine, and found that all the exhausts were fine.
However all the inlets were about 2 or 3 thou, whereas the factory says 8.
The gaps will never get larger due to valve stem stretch, which by 30,000 they should've stopped.
Joolz has a special tip about them, but I'm sworn to secrecy
Not so I'm afraid. I thought this to be true as well but recent experience has shown differently. Tappets were adjusted at the 36,000 mile service. At the 42000 the car was running poorly with low speed hunting, poor part throttle running and general malaise. The boys at peninsula checked everything likely from throttle pots, injectors, fuel pressure, spark traces etc etc All OK but they were having great difficultly in balancing the throttles out. In final frustration, they lifted the cam covers and checked gaps. One was ZERO!!!! Another was 16 thou (instead of 11 I believe) others had closed up too but not quite as severly. Gaps all reset and hey presto. Engine now sweet as a nut. Moral to this? - every engine has its own quirks and generalisations are dangerous. Get them checked every service and dont rely on the its all over by 30000 tales. Mind you, Peninsula were surprised too.
Regards John
joospeed said:
something very strange about your engine then john .. if there's a large gap there's a reason .. either it was set incorrectly before or there's something happening .. top of valve stem hammered?
Absolutely nothing visibily amiss - cams are still beautiful - like new, valve tops look fine. I thought Richard rang you about it last week, at least I thought he was on the phone to you, lol
John
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