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Thread: 304 knocking

  1. #1
    casual poster nasty1's Avatar
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    Thumbs down 304 knocking

    hello all.

    just finished installing a new clutch fan and ditching the thermo setup that my 304 had last night.
    went out today after work and went to test how it would go.all was running good untill after around
    2 minutes of letting the car warm up she had started to run what sounded like 5/6 cyl and also
    knocking.i couldn't isolate wither it was from the left or right bank as it wouldn't run long enough
    for me to have a suss.


    what are peoples thoughts?it wasnt your normal lifter tapping it was a louder knocking.

    cheers guys in advance.

  2. #2
    Do you ever leave?
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    How's the oil pressure?

  3. #3
    Do you ever leave? paulzig's Avatar
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    is the fan locking up on the clutch and then hitting on the shroud or the radiator somewhere??

    that wont account for roughness unless its knocked a fan blade out of balance or something

  4. #4
    casual poster nasty1's Avatar
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    the oil pressure gauge on dash is fairly ordinary unsure how accurate it actually is.

    the fan is not hitting on anything.

    ill also note that the last time it was driven the thermos shit them selves and the car temp got hot.not in the red but not to far from it hence why I put a clutch fan back on.

    also the car itself had been not driven for a few years unill recently.maybe the pick up is blocked? done 300ks since being back on the road.
    Last edited by nasty1; 17-05-2014 at 08:27 PM.

  5. #5
    casual poster nasty1's Avatar
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    not good.done a comp test and one cylinder down 100psi.heres the plug on the right from that cylinder.



  6. #6
    Do you ever leave? RVK 355's Avatar
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    Looks like time to pull a head off to investigate even more

  7. #7
    casual poster nasty1's Avatar
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    yep.organising to pull one head of for a look.mite have to put the 355 in thats in shed

  8. #8
    Do you ever leave? Mickss355's Avatar
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    Quote Originally Posted by nasty1 View Post
    not good.done a comp test and one cylinder down 100psi.heres the plug on the right from that cylinder.



    Some people get really upset over these things - for some its just an excuse to do more work lol !
    He who dies with the most toys wins !

  9. #9
    casual poster nasty1's Avatar
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    yep this has just moved my plans forward a year now lol.

    can I put my 350 crank from my turbo pattern motor into my vl trimatic pattern with minimal dramas?

  10. #10
    Do you ever leave? Mickss355's Avatar
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    Quote Originally Posted by nasty1 View Post
    yep this has just moved my plans forward a year now lol.

    can I put my 350 crank from my turbo pattern motor into my vl trimatic pattern with minimal dramas?
    Yep so long as both had the same type rear main seal and you clearance the new block
    He who dies with the most toys wins !

  11. #11
    casual poster nasty1's Avatar
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    no probs.sounds like whats going to happen pending on whats actually wrong with the 304.better start saving for new headers and inlet manifold

  12. #12
    casual poster nasty1's Avatar
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    i thought ill keep updating this for future googlers in search of a similar issue.i know how annoying it is to google stuff and no one ever comes back with the answer to there problem.

    although i have not pulled that cyl head off just yet i did put a little inspection camera down for a look.no broken piston or valves floating around or even porcelain from that plug.is it possible that porcelain has got stuck behind valve ad when piston came up has bent the valve?

  13. #13
    Part of the furniture monaroman76's Avatar
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    I'd imagine it would have been pulverized in the cylinder and spat out the exhaust. No doubt doing all sorts of damage to the exhaust valve/seat on the way out..

  14. #14
    casual poster nasty1's Avatar
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    well I still never pulled the cyl head off.i was still not 100% on the head has to come off idea.

    so had a good mate come around and suss it out.i better put on a decent oil pressure gauge as we ran it 3 or 4 times at short periods of time and not once did we get oil up the top at all.

    he said it was more of a clatter coming from all lifters not a knocking(im used to hearing the ticking of one noisy lifter not 16)not a knocking.his speed boat done the same thing.
    but whys the comp down? collapsed lifter leaving valve open maybe.


    so I think my mext port of call is replace oil pump and lifters and see what happens?

  15. #15
    Part of the furniture monaroman76's Avatar
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    Hmmmm, head needs to come off mate. That much material cant come off the plug and not do any damage. I think you will find your exhaust valve seats is damaged and not sealing. You could do a leak down test and confirm where the pressure is going.

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