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V8 'knock'

Discussion in 'It's A V8 Mate!!' started by lrjohn, Feb 25, 2010.

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  1. lrjohn

    lrjohn Member

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    Just bought a V8 '95 Disco, 3.9. I noted it had a slight knocking sound , which appears to be from top area of engine. It goes when revs increase above say 1200 to 1500 rpm, engine is quiet otherwise. I have heard that LR V8's can get cam knock due to some slack in positioning of the cam and LR issued tech note on this. Anyone had this and if so how do you fix it? What happens if you dont!! :confused:
     
  2. fett

    fett Well-Known Member

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    Try putting in some castrol magnatec in it , quietned mine down a treat over that comma cheap ****e. mine only does it about 10% of the time now lol
     
  3. vougese39

    vougese39 Well-Known Member

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    worn cam sticking followers worn rocker arms anything over 70k needs a cam as worn.
    as for the slack that is called wear and tear! there is a cam keeper plate which can be fitted but only stops the cam rocking back and forth at high rpm
     
  4. norseman

    norseman Well-Known Member

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    Any particular personal experience of Comma to give you that opinion? Granted it's cheaper than some of the other brands but their 15/40 & 20/50 that I use/have used has a higher spec. than LR's stated requirement & neither of my 3.5's have developed any noises. I am a great believer in the saying 'you get what you pay for' but sometimes you can pay over the odds for the name. My current 3.5efi has a genuine low mileage & I look after it so I welcome anyone's (constructive) comments.
     
  5. fett

    fett Well-Known Member

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    I had comma in it , it was noisy.

    Mangantec in it - it was quiet.

    Proof, pudding etc:D
     
  6. 1992lse

    1992lse New Member

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    yeah but the comma stuff had been in there 12 years you tight git :hysterically_laughi
     
  7. fett

    fett Well-Known Member

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    Fook off , I used it as me flushin oil-1000miles only! :p
     
  8. norseman

    norseman Well-Known Member

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    H'mmm, not quite the technical appraisal I was looking for but I suppose as opinions go.....:doh:
    Alternative theory : Engine had too much tolerance (sounds nicer than shagged) & needed a thicker oil :rolleyes: My last 3.5efi had 155k under it's belt but wasn't 'noisy' running on Comma 20/50. Have tried Duckhams in the past but whatever expensive oils are supposed:cool: to do, it didn't. Used to use Unipart 20/50 but changed to Comma as my local acc. store is an agent for the brand.
     
  9. fett

    fett Well-Known Member

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    Ha Ha, they were both 10w40 :rulez:
     
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