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  1. #1
    Administrator blackpopracing's Avatar
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    So what would you do?

    Had a friends car over today to check/set valve lash. It's a new engine to him and freshly built within the last 12 months.
    Found a loose rocker - no5 inlet, so thought aha!

    But...... upon turning the engine over to check the rest we noticed that that valve was not being depressed much - about 3mm less than the others.

    Fairly certain he's lost a cam lobe

    Soooooooo.......talking to an engine builder later on (who is a bit cautious in his advise) who advised a total strip down as there will be iron filings in the engine and it will probably need new piston rings and all the oil galleries cleaned, oil pump stripped etc.

    We 'think' its gone in the last 100 miles or so, the engine does have magnets in the valley & sump so do we need to totally strip the engine & rebuild or would 2 engine oil flushes before replacing the cam clean it out enough and could we get away with then fitting a new cam & lifters?

    Sump is coming off regardless as it's being changed, so we can strip the oil pump for inspection/cleaning and pull some mains & big ends to inspect the shells. If these look ok does it confirm the oil flushes would be enough?

    Or is the only sensible option a total rebuild?

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    Gear head Lemon's Avatar
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    I know people that have rolled the dice and got away with it, but as far as an engine builder or anyone else that values their reputation, nothing short of a full strip down will do.
    More than it shoud be, but not as much as it could be

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    Official RnS Addict 28Chevy's Avatar
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    Total rebuild, no question, why take a chance of having to do it all again?
    Whirrr whirrr chuff chuff de chuff........chuff......BRUMMMM!

    My Chevy thread: https://www.rodsnsods.co.uk/forum/sho...y-coach-403745
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  7. #4
    Administrator blackpopracing's Avatar
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    Yeah, engine builder said we could try the flush - especially after he knew it had a magnet kit in it but as said, only a total rebuild is 100% certain.

    I feel for him as it's cost him plenty so far - a total rebuild on a new engine is a kick in the nuts unfortunately

  8. #5
    Off the Xmas card list kapri's Avatar
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    Bigger question is WHY has it failed ? Not broken in correctly ? Why sold on so soon after a 'rebuild' ?

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    Im sure everyone did a complete strip on a Pinto eng back in the day when they had wiped a cam lobe.........................................

    The prob here is that ONLY the person who owns the engine can say what to do....I think we all know why.

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  11. #7
    Administrator blackpopracing's Avatar
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    Kev,

    Probably not broken in properly I reckon. Might be wrong oil used or possibly valve springs not matched to cam in that order.

    68 roadrunner - that was my kind of thinking too. Plenty of bad cams in america get swapped out without total rebuilds as well.

    I've not offered yet but I'll rebuild it for him if he wants me to.

  12. #8
    Exceeded sell by date Plumpcars's Avatar
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    We changed skiploads of cams over many years at a top end manufacturers, the book never gave you the hours to rebuild the engine. I never knew one come back. Tell that to a rodder and they look at you as if stupid. Only the owner can guide you.

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  14. #9
    Administrator blackpopracing's Avatar
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    Good to know Steve, how are you keeping nowadays, not seen you for years!

  15. #10
    I'm a grown up drunk! chevy2's Avatar
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    Several years on breaking in a fresh engine with a numbered lifter cam and lifters from another emgine i got that dreaded start of a misfire about 20 mins into the break in period,
    Shut it down immediately and found mikd grit in the oil as expected,
    Quick top end check showed that 3 lobes has strated to fail,
    Pulled the motor and found shot bearings and even hneeded to go 10 on the crank to put it all back together,
    Went roller cam on the rebuild,
    Yes you can get lucky with a good flush but that wouldn't have worked for me as above.

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