Vehicle & Technical > Discovery

v8 only firing on 7 not 8

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gtomo2:

--- Quote from: "Range Rover Blues" ---Weak/broken valve spring
blocked hyrdraulic lifter of faulty the same
worn camshaft
piston slap
--- End quote ---


Sounds like tappets so it could be one of the first three. but dont think or hope its piston slap :roll:  but knowing my luck :wink:

Range Rover Blues:
Piston slap is a lower pitched knocking, not as deep as the rumble of the big end but sometimes confused with it.

If ity id, don't worry.  as long as you have good compression adn don't use any oil, ignore it.

Valve train knocking has more of an, how can I put this, urgency to it? it's sharper somehow.

Oh, piston slap will get better when you stop the effected cylinder from firing, try that.

Some people recon you can detect play in the valve trian by putting pressure on the effected rocker, or stuffing a feeler guage in the gap but on these engines look for a pushrod/rocker with no preload at all, otherwise check the lifters for sideways play (sorry but that's irreparable).

gtomo2:
Yea think it is tappet as it sounds like my old hillman sunbean but only one tappet not all of them. plus it does not get louder the higher you rev it and its only there when you press the loud pedel. but not when free wheeling. first i thought it was the exhurst blowing again but it dont get louder with revs it. think i will just put this other head on and have done. Thanks for all your help so far. and congrats on the wedding :D

Range Rover Blues:

--- Quote from: "gtomo2" --- it does not get louder the higher you rev it and its only there when you press the loud pedel. but not when free wheeling.
--- End quote ---


That sounds more like slap then, the valve train is not loaded any higher when you push the gas pedal.

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