Tappet adjustment
Discussion
It's DEFINITELY every 12,000. I think it was initially 24k, but then brought down to 12 due to problems with going far out of spec. It's also a 1000 mile service item, e.g. a new car or after an engine rebuild.
I think you need a special tool to hold the cams in place while you adjust them, so not really a job you can do yourself, even if you can get hold of the shim sets (may be possible to get from tvrgear though). It might be easy to fabricate a holder though.
Better off just paying an independent expert like www.joospeed.net £150 to do the lot in one go. I should have some pictures of the job; my 4.5 is being done by Joolz tomorrow.
danny
I think you need a special tool to hold the cams in place while you adjust them, so not really a job you can do yourself, even if you can get hold of the shim sets (may be possible to get from tvrgear though). It might be easy to fabricate a holder though.
Better off just paying an independent expert like www.joospeed.net £150 to do the lot in one go. I should have some pictures of the job; my 4.5 is being done by Joolz tomorrow.
danny
I checked all my tappets on Saturday, under the watchful eye of Joolz (www.joospeed.net) while he got on with the more interesting stuff.
Strip off the airboxes and cam covers, the clearances should be 10 exhaust, 8 inlet - slightly wider is fine since they only close up - stretching valves I suppose. Most of that 5 hours is messing with cleaning up the gasket faces so that they reseal properly and getting the bastard purple tubes back on (you're lucky if you have a 4.2).
Unfortunately, if you have to adjust it you need a tool to hold the timing chain pulley while you remove the cam. Mine were all in spec, but I wouldn't do this part on my own personally, and unless you're a dealer, you won't have the appropriate full set of shims (expensive! - £3 each!) anyway.
danny
Strip off the airboxes and cam covers, the clearances should be 10 exhaust, 8 inlet - slightly wider is fine since they only close up - stretching valves I suppose. Most of that 5 hours is messing with cleaning up the gasket faces so that they reseal properly and getting the bastard purple tubes back on (you're lucky if you have a 4.2).
Unfortunately, if you have to adjust it you need a tool to hold the timing chain pulley while you remove the cam. Mine were all in spec, but I wouldn't do this part on my own personally, and unless you're a dealer, you won't have the appropriate full set of shims (expensive! - £3 each!) anyway.
danny
Ah, you must have a 4.2? On the 4.5, you can remove the purple tubes and airboxes and get at the cam covers directly. I suspect you need to take the inlets off on the 4.2 then, can't you just number the injectors for the cylinders? Just keep the inlets somewhere clean (or send off to Joolz for porting - worth an extra 20bhp).
I am NOT an expert though - ask your dealer, or perhaps someone who's done a 4.2 can help? Or send joolz@joospeed.net a mail.
I am NOT an expert though - ask your dealer, or perhaps someone who's done a 4.2 can help? Or send joolz@joospeed.net a mail.
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