Excessive Cylinder Skirt wear hp440

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  1. TOMRR

    TOMRR Well-Known Member

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    What would cause excessive cylinder skirt wear on only two Cylinders in a rebuilt 440 with two summers of driving and about 3500 miles

    Thanks Tom C.
     
  2. quikbird

    quikbird Well-Known Member

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    Check bore diameter. Excessive wear is usually due to too much wobble on the piston. Piston could be too small or those cylinders a little bigger.
     
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  3. IQ52

    IQ52 Member

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    Somebody put an engine together dirty? What does this "excessive cylinder skirt wear" look like? Pictures?
     
  4. quikbird

    quikbird Well-Known Member

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    Excessive scuffing on the skirts. Usually caused by too much piston slap
     
  5. RKNRLR

    RKNRLR Well-Known Member

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    ill go with too much piston knocking too. had the same issue with my 440 before i pulled it down. had it bored .040 over (was at a rough .030 already) just to clean it up. also had all the new rotating gear balanced. They took some material off of 2 piston skirts, but none of the others.

    runs like a new watch now.
     
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  6. TOMRR

    TOMRR Well-Known Member

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    My engine builder is saying excessive full dumping( Carb Issue) into cylinder and it wash down two of the cylinder skirts, He found a piece of metal in 750 Holley. Not a clue where it may of come from, There is a filter after the pump and the metal fuel line looks ok. He said it was to big to pass through the filter. I am having a hard time buying into that reason but then again I am not a motor guy.
     
    Last edited: Dec 9, 2017
  7. dmartin

    dmartin Well-Known Member

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    Somebody accidentally left some foreign substance in the block sounds to me as far as the fuel dumping I don’t know that’s a new one on me man maybe he didn’t change out two sets of rings that’s the reason I like doing things myself if I don’t know something I get somebody who knows and let them look over my shoulder
     
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  8. popslavaz

    popslavaz Member

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    Could be a pin issue,not letting the piston center after direction change. POPS
     
  9. BOB KAMMER

    BOB KAMMER 1969 Road Runner

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    I AM GOING WITH THE CARB FLOODING
     
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  10. Russ69Runner

    Russ69Runner Well-Known Member

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    Never heard of metal getting past the fuel filter into the Carb. Had to been in a line or some fitting when putting the Carb. on or replacing some part of the fuel line to it. It is possible to wash a motor down by over fueling. No oil hence excessive wear on cylinder wall and the piston as well as ring's. If you pull the dip stick shortly after doing an oil change and smell's like gas think you have a problem. This is usually to much carb for the motor. Hope you get it worked out. Russ.
     
  11. 69hemibeep

    69hemibeep Sponge Bob Square Wheels

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    Yep, if your oil gets dirty quick its fuel
     
  12. perfetech

    perfetech Member

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    You never mentioned the cylinders numbers of the two bores.
     
  13. TOMRR

    TOMRR Well-Known Member

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    It did not get past the filter.
     
  14. Russ69Runner

    Russ69Runner Well-Known Member

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    Boy that is a good thing. Witch cylinder's had the piston skirt wear. Led and lag some time have these problems. Led being number one and number eight being the lag. So that being said let us know which one it was weather number 4 or what ever. This would be interesting to know. Thanks Russ.
     
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  15. halftrackman1

    halftrackman1 Active Member

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    did you have a windage tray in the engine. I don,t not use wind trays, I think they cause piston wear, I like all the oil to fly around in the engine, Also number 1 piston and cylinder will have more wear, the torq start at number 1. I may be wrong too. just my thinking, no I not drinking
     
  16. TOMRR

    TOMRR Well-Known Member

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    Yes I am using a windage try, Some how a sliver of metal got into the 750 holley and it stared flood the engine with to much fuel This all happen on the second summer of driving and about 2500 miles. plus there may have been and issue with one two pistons not sure witch ones the engine is back at the builders and replacing piston for free, no damage to cyl. walls plus a cut rate for the Labor.
     

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