Vehicle & Technical > Discovery
Top end noise 3.9v8
JIMBOBLY:
--- Quote from: bogie on August 26, 2009, 21:45:29 ---CAM FOLLOWERS! As they turn they find the flat spot and tap.Sometimes they tap and sometimes they dont.
--- End quote ---
i'd say you're bang on there chap,ive also seen this too!
Range Rover Blues:
--- Quote from: JIMBOBLY on August 27, 2009, 22:14:27 ---
--- Quote from: bogie on August 26, 2009, 21:45:29 ---CAM FOLLOWERS! As they turn they find the flat spot and tap.Sometimes they tap and sometimes they dont.
--- End quote ---
i'd say you're bang on there chap,ive also seen this too!
--- End quote ---
Eh :-k I don't understand.
mattyme:
youi got your rattle sorted then tim?
Range Rover Blues:
Been there, done that and it made no difference. The cam itself has the lobes ground slightly tapered so that the follower runs on one edge, this makes the followers spin.
At cranking speed once you have got the top of the engine off you can see the lifters running on the cam lobes, if they aren't spinning then the cam is worn, fitting new followers will make little difference if any. You may also see discolouration on the cam lobes themselves and close inspection of the followers might shouw they have worn concave (if this has ahppened then new followers might make a slight difference until they too wear away).
The theory is that a follower which doesn't spin doesn't pick up enough oil to fully extend so the valve clearance can get too wide, hence the tapping.
That's what I'm told.
bogie:
Thats right mate,the price of a cam you might as well chuck a new one in and get the performance as well as the life outa the job! Its basically false eccomney not to!
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