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Engine rattle on down rev

Discussion in 'VR - VS Holden Commodore (1993 - 1997)' started by losh1971, Jul 14, 2019.

  1. delcowizzid

    delcowizzid on holiday

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    Check you lifter preload properly.pick a cylinder and turn the engine un till the exhaust valve on that cylinder just starts to open.release the bolt on the inlet valve on that cylinder and let the lifter relax for a couple of minutes.then turn the bolt down till you get to 0 lash and the pushrods gets a little drag when turning it between your fingers then measure how many turns you get on the bolt till tight.turn the engine un till the inlet valve is just about to close and do the same procedure on the exhaust rocker bolt as you did on the exhaust. Let us know how many turns you get
     
  2. losh1971

    losh1971 Well-Known Member

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    From the front of the engine which valve is the first exhaust one, first one or second one in?
    If the issue is preload what can i do about it?
     
  3. losh1971

    losh1971 Well-Known Member

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    Do i need to use loctite? I was but the internal threads are all greasy now from pulling the lifters off and on a couple of times, trying to figure out what is going on.
     
  4. delcowizzid

    delcowizzid on holiday

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    Front passenger side cylinder exhaust is the 1st valve
     
  5. losh1971

    losh1971 Well-Known Member

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    Cool i might start with the drivers side as i already have the cover off.
     
  6. delcowizzid

    delcowizzid on holiday

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    Exhaust will still be the 1st valve
     
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  7. losh1971

    losh1971 Well-Known Member

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    Excellent that's what I wanted to know. I will get the drivers side done today and report back.
    May i ask is Loctite a must? The bolts seem pretty tight. I know they use blue gear from the factory. I have the blue gear but not sure it will help with oil and cam grease in the female threads now.
     
  8. losh1971

    losh1971 Well-Known Member

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    Delco on the drivers side the rod is almost touching the hole at the bottom. Do you think this could be the issue? I'm not sure whether i should file out the hole or try to buy a thinner rod? Not sure if i can get a thinner rod and the same length?
     
  9. Lex

    Lex Well-Known Member

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    Have you checked to see if all the rods are the same diameter?
    Maybe there is a thinner one that needs to go in that position?
     
  10. losh1971

    losh1971 Well-Known Member

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    First two valves on drivers side have about 1/3 of a turn on the ratchet before they feel tight. The torque wrench may go a tad further but I just stopped there to check in.
     
  11. losh1971

    losh1971 Well-Known Member

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    All rods are the same Lex.
     
  12. losh1971

    losh1971 Well-Known Member

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    Using the TW in total the bolts are going down about half a turn.
     
  13. losh1971

    losh1971 Well-Known Member

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    Third valve back half turn, fourth valve 1/3 turns.
     
  14. losh1971

    losh1971 Well-Known Member

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    I am making rods so that i can only just move them with my fingers, before tensioning up to spec.
     
  15. losh1971

    losh1971 Well-Known Member

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    Wondering now if I should even bother, since it seems they may not be getting enough preload.
     
  16. losh1971

    losh1971 Well-Known Member

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    Cyl 1 pass side almost 3/4, second one in 1/2 - 3/4 third cyl from the front same side about 1/2 or a smidge less.
    Putting rocker cover back the pass side as there is nothing I can do myself to increase preload. Leaving driver side off upon advice as to what to do with front most rod and hole.
    Edit: there could be around an eighth of a turn more as that first bit of preload is hard to gauge, because it is hard to feel with the Tq W.

    I have to stop now as it's beginning to get dark and if I stop now the cursing won't begin. I have the very front lifter left to go on the drivers side, once I work out what to do. I also ended up using Loctite blue on the bolts after removing and cleaning them with a rag and brake cleaner. The threaded holes in the heads may or may not be oily, can't tell.
     
    Last edited: Jul 16, 2019
  17. delcowizzid

    delcowizzid on holiday

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    1/3rd isn't a lot of preload .the pushrod you think is close to hitting did you check it at all lifts it will move a bit as the rocker pivots.
     
  18. losh1971

    losh1971 Well-Known Member

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    I run the engine without the drivers side cover on and that side was working all good. It does have clearance but at most it would be 1mm from the bottom of the hole. 1/3 on a couple but I'd dare to say that those couple are quite likely more like 1/2. Like I said it's hard to gauge it exactly with the Tq W. I did a couple of cyls with the ratchet and finished it with the Tq W and they were certainly at least 1/2. I spun the rods in my fingers and move the crank and tightened the rocker until I could barely turn it in my fingers. Because the Tq W is long and you don't have heaps of room it becomes hard to be precise.
     
  19. losh1971

    losh1971 Well-Known Member

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    The issue i have now is whether i file out the hole or leave it? I don't have any way of increasing the preload without a mill. I am thinking the chain is probably fucked given the engine probably has 200k on it. Don't know if that will help preload but I have to do something. Its booked in for next week to have the timing cover removed and checked the chain, plus an oil pressure test first up. Unfortunately its looking beyond my capabilities.
    Kinda wishing i didn't spend the big money and maybe should have settled for less power. Because I am not sure that the problem will be resolved without extensive work and replacement of lots of parts. If the issue is preload and i need to have milling done that could easily add another $400 to the job. The engineer is very pricey.
    In hindsight i should have kept the old rocker gear in order so that i could have sold the Mace set and refitted the old ones.
    Unfortunately the one bloke in Launceston who could name it with just a listen, doesn't want to even listen, because he is the best but he is a grumpy old bastard.
     
    Last edited: Jul 16, 2019
  20. delcowizzid

    delcowizzid on holiday

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    Set of pushrods is cheap
     

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