not so happy
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not so happy

  1. #1
    Member 78bahnerman's Avatar
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    Default not so happy

    doesn't this piss u off u take your engine to get rebuilt and your wrist pins feeze up and all rod bearing r fryed after only 45mins of run time. had good oil presser any ideals what would cause the the wrist pins to lock up like that u cant even move the pistons on the rod.and its not like it only did it to one but it did it 2 all of them.

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    jetboataholic HawaiianJet's Avatar
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    Quote Originally Posted by 78bahnerman View Post
    doesn't this piss u off u take your engine to get rebuilt and your wrist pins feeze up and all rod bearing r fryed after only 45mins of run time. had good oil presser any ideals what would cause the the wrist pins to lock up like that u cant even move the pistons on the rod.and its not like it only did it to one but it did it 2 all of them.
    Damn, that sucks. Looks like you'll be looking for a new machine shop.
    HJ

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    One part at a time... JohnnyNitrous's Avatar
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    Im gonna say wrong clearances on the bearings and the heat from that caused the wrist pins to seize as well? Someone else with more knowledge might know better but thats my guess. Ask your shop if they have heard of plastigage.

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    Senior Member sdpm's Avatar
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    Pinfit was to tight. Either not done correctly or not done at all. Did you assemble the engine or the shop? If the shop did it, have you showed them? What was their response? Sorry for your problem! Hope you get is resolved.

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    Rollin With Fink fasterthanu's Avatar
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    Did Rex Hutchison Racing Engines do the work? Oh crap here I go again!!!

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    Senior Member jetboatperformance's Avatar
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    Mic (measure) any remaining "good spots" on the crank journals and then look at the bearing size designations on the main and rod shells ,just curious ,got lots of Ideas but would be interested in more info prior to speculating, What pan what O'pump ,what oil ?? the more info the better Tom

    Heres a web site to look at pretty good examples , you be the judge ..
    http://www.thirskauto.net/BearingPics.html
    Last edited by jetboatperformance; 04-25-2008 at 01:28 PM.

  9. #7
    Member 78bahnerman's Avatar
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    ya showed ? i wont say any names wright now see if hes going to fix the problem for free. he said he heats up the rod then press the pin.he was trying tell me the oil was contaminated i can see over a long time but 45mins of run time guys kind of arrogant and trying to put the blame on us.ah [email protected]#% it i don't what to see any one els have the same problem it was A&d engines in Whittier.

  10. #8
    Half a bubble off jrork's Avatar
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    Wow! I am by no means an expert (or even a novice) but I would look over everything closely for heat issues too. I've seen discolored mains from heat generated by stuff worse than that (yah, I know these are the rods, but I would assume the same worries apply).

    Regardless, good luck and I'm certain there are many here that are willing to talk you off the ledge........john

  11. #9
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    What was your oil pressure like? Either no oil pressure at all or way to tight of clearances and I am betting on the second. That sucks, hope the shop stands up and takes care of it.

  12. #10
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    Default OK.....

    You say you had good oil pressure. What was it?.........What do the main bearings look like. Was the carb/fuel pump flooding liquid gas into the engine?.....Do you have a water temp gauge? and where is it picking up the temp?........How badly are the piston skirts gauled? Usually press pin pistons come with the matching wrist pins already in the pistons, but it is always a good idea to give them the shake test. With your fingers over one side, and your thumbs over the other, shake the piston. The pins should move from fingers to thumbs with very little resistance.........Some light oil should be used for this purpose. Also, when installing pistons, invert the entire piston in a coffee can of oil, below the pin boss and let the oil work its way into the piston from all sides. I don't know if you assembled it or the shop, If it was the shop it would seem to me they should have caught tight clearances, or a not so straight crank binding in the main saddles.....MP

    PS I went back and looked at your pics blown up and there was some serious clearance issues. It could also be the jet pump pushing the crank off center, and/or actually having the splined shaft bottomed out in the slide yolk I had a jet motor tear up the mains in 5 minutes, and the rod bearings survived. Never found out why, but finally wrote it off to pump/crank C/line error........
    Last edited by Moneypit; 04-25-2008 at 05:50 PM.
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  13. #11
    Senior Member jetboatperformance's Avatar
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    Show your "builder' the pics and the "bearing failure examples", honestly looks like lack of lube to me (that could be multple things) . If he assembled the motor and "prelubed it" he should have the opportunity to look at it and provide you his honest opinion as to exactly what he feels caused the failure (in writing) ,probably everyones curious to know what he gives as a reason ? . Give him the opportunity to help if he will he deserves the benefit of the doubt ... Tom
    Last edited by jetboatperformance; 04-25-2008 at 10:39 PM.

  14. #12
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    Damn that thing is cooked!
    What about oil filter, is it remote, and if so where the lines run in reverse possibly?
    The piston pins are seized due to no oil splash off the rods and metal contamination in the oil.
    Last edited by SRP1; 04-26-2008 at 07:10 AM.

  15. #13
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    It appears from the pictures that the offset in main bearing tangs would prevent the bearing from being installed improperly.
    A problem like this usualy starts in one place and travels down the system. From the looks of the main bearings it started there, either from oil starvation, WAY too tight of clearances or lack of lubrication. You can see a few grooves in the mains from some trash but it may have happened after the damaged started. With good oil flow and proper clearance you can still run a few peices through there and get away with it so I am assuming it wasn't just from a dirty build so it is still pointing at a lack of lube or a SERIOUSE clearance problem (were the main caps installed in the proper positions??).
    I would bet that the piston pin problem is from this lack of lubrication, or it was WAY improperly clearanced also (or both). It would be tough for the problem to start at the pins as a properly running engine would destroy the piston long before it took out all the bearings due to a pin/pins locking up. If everything else was good and the pin siezed it would have yanked the pin right out of the boss or broke the pistons into pieces.

    To me all of this points to an oiling system problem or machining/assembly error starting at the main line.

  16. #14
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    Yah, I guess I was a little tired when I posted that about the upside down bearing thing, post edited.
    Main caps on wrong, a definite looks see there.

    One other thought however is a remote mounted filter that did not have a bypass, and collapsed, or just a bad collapsed filter period.

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