Vehicle & Technical > Range Rover

wheel judder

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Range Rover Blues:
Are they tin gaskets? because it sounds like you're saying the head warped and you lost the gasket.

Get them skimmed and fit composite gaskets.  It' sbest to do both side to match though, but I pay £20 a head for machining and the gaskets willset you back about £50 posted.

Range Rover Blues:
Yes, that looks to me like the heads gone a little.  If it's only a little you can try to get away without skimming, but you must then use composite gaskets.

I'd suggest a light skim and composites anyway.  the composites are 1.2mm thick whereas the tin are 0.5mm, so you can take 0.7mm off and do nothing to raise the C:R.

I'd strongly suggest you do both sides the same, leaving one side now is a false economy.

When you rebuild the heads, lap the valves in until there are no more black marks on the seats, work hardened valves and seats are better than new ones in a lead-free engine ;) check that none of the valves are bent or otherwise sticking in the guides.

I like to de-coke the pistons, use lots of WD40 and a scouring pad.  Seal the piston in the bore with CV joint grease, then lift it our carfully with an old feeler guage (hoping the edges are blunt, not full of nicks).  Check the bores for scratches, these could indicate a broken ring.

If the valves are good and you sort out the head gasket, it should run nicely :D

Range Rover Blues:
Good luck then mate ;)

Range Rover Blues:
If the bores are fine then do a compression test to check the rings aren't worn.  Yes the camshaft wear/lifters could be a factor, or it could be in the ignition system.

Another, slightly more detailed test is the leakdown test.  You need a compressor then a leakdown tester, I'm after on emyslef and this is the cheapest I've found.

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&rd=1&item=110210715631&ssPageName=STRK:MEWA:IT&ih=001

Range Rover Blues:
All your compr tests arw ithinh 10% so your engine is mechanically sound, which is encouraging.

If you can hear the missfire at idle then try disconnecting some of the injectors, you need to do at least 2 at once before you notice a drop in revs, but this might tell you which cylinder is missing.  You can sometimes tell by the temp of the exhaust manifold too, the poorly cylinder will have a slightly colder stub on the manifold.

Did you say you'd checked the plugs? did none of them shed any light?

Another thing is the condition of the dizzy cap.  I had one that caused a misfire and when I looked insode it the missing cylinders had a correspondingly clean contact in the dizzy cap, the good ones were slightely burned as normal.

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