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oldairboater oldairboater is offline

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  1. oldairboater
    10-23-2011 09:59 PM
    Use new head bolts if you get this one out and torque to specs. The better way to de carbon an engine is to use a garden sprayer and let the engine suck in a fine mist. Do not break that easy out off in your block. They don't drill out. I prefer to use a just under reversed rotation drill bit and center punch the bolt. The danger with that is breaking the bit or drilling off center.
  2. rjracin240
    10-17-2011 12:06 PM
    Finally got a chance to do some extensive troubleshooting while having a friend drive the boat. Drove the boat at about 2,500 while pouring some water down the carb (I can hear the groans now!) to decarbonize the engine, no luck still detonating. Double checked the timing again, set the mixture and adjusted idle, still detonating. Then started looking around and listening to engine to see if the detonating could be isolated. Found water spurting out of #1 cylinder head lower bolt and a little out between the head and block. The water spurting out of the head bolt was hitting the back of the alternator and was making a sound like detonating.
    My friend helping me out had his son with him so had his son torque the head for some experience; in retrospect should have done it myself. Dont have a Indmar manual so use the PCM manual dowloaded from the Mastercraft forum. Torque value for the cylinder head bolts was listed as being step torqued @ 90-100-112, when he went to 100FTLBs the bolt snapped. Thinking if it was me torquing it would have felt bolt stretch and would have known to back it off. Valuable lesson for both of us, him to know what stretch feels like before letting loose and for me not to have done this crucial step myself.
    Has me curious as to whether the torque I got out of the manual is correct. Standard torque table for a 1/2-13 bolt was no more than 60ftlbs, with a note saying that if other specific torque was specified to use specified torque!

    Hoping that I can easy out the bolt left in the block by using a left hand bit and lots of penetrating oil and prayers!

    Not sure if this is a common problem for the head bolt on #1 to loosen like that. Engine had steady vacuum at 15 with no oscillation so thinking the head gasket sealing #1 cylinder is intact.

    Any suggestions or comments welcome
  3. oldairboater
    07-12-2011 11:26 AM
    The river is not as crowded now for some reason. Some areas are bulkheaded on both sides and really keep the water rough. I can still find areas with glass waters. Still more boat traffic than what I see on the Colorado though. I put in at Churchhill out of habit. I grew up in Jones Creek. McNeil is still a steep ramp. I always liked the Colorado below the golf course. Fished there a few times but too far to drive to ski. We are lucky to have these rivers close for water skiing---I never enjoyed skiing on the lakes. The rivers spoiled me.
    07-12-2011 10:19 AM
    Last time I went over there it was very crowded. (4-5yrs ago) I skiied over there a lot during the late 80's and early 90's. Do you put in on 521 (Churchill bridge IIRC) or do you have a place on the water with a dock/boat lift?
    Bay City is my home town and thats where I like to ski. Low traffic and always skiable water.
    My Dad still lives there and I can alway stay the night, if I choose to.
    07-11-2011 10:30 AM
    It's the Colorado River in Bay City TX.

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  • About oldairboater
    Team MasterCraft Member
    Boat Owned
    Mastercraft, Prostar, 1992, 351 Ford


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  • Last Activity: 07-03-2012 09:44 PM
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