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BBF-ER

  • Karma: +0/-0
overheating issue
« on: September 25, 2021, 11:02:33 am »
My 1976 Hallett has a 455 olds w/a berk jet. With it on the trailer in the water starts to over heat quickly, Would a valve between the block and jet help or could it be something else? Thanks for any advice.
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sgriffin

  • Karma: +0/-0
Re: overheating issue
« Reply #1 on: September 25, 2021, 11:55:52 am »
Oil check/plug check

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mobboss

  • Karma: +15/-0
Re: overheating issue
« Reply #2 on: September 25, 2021, 02:06:08 pm »
id say the block is filled with sand and rocks try flushing out the block!!


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BoatsNhoes

  • Karma: +14/-0
Re: overheating issue
« Reply #3 on: September 25, 2021, 02:28:14 pm »
Start from the beginning  where the water is picked up from the jet housing and go from there . Make sure all the hoses are clear from that point going forward . The two main reason for this is low heat transfer which is scale and dirt or sand for sure  and restriction to flow , something stopping the water from flowing at a correct rate from supply to water pump from pump to block and so on “” I’m sure there dudes here that can offer way more than me but it’s happened to me and a friend and at the end of it all , in one case if we would have started at the beginning we would have caught  the  problem sooner Good luck  Brother and good hunting


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BBF-ER

  • Karma: +0/-0
Re: overheating issue
« Reply #4 on: September 25, 2021, 03:19:11 pm »
Thanks guys for the input. I checked the plugs and it does look like its running a bit rich and oil looks good. block was flushed and haven't had it in a situation where it could suck up shit. I will start at the intake and check all lines from there. Thanks again.
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BoatsNhoes

  • Karma: +14/-0
Re: overheating issue
« Reply #5 on: September 25, 2021, 04:50:57 pm »
Good start !!! Solid plan !!!    I’m sure you’ll find the problem . Even if you find it at the end of your cooling system at least you would have inspected you system and that alone should give you piece of mind on the integrity and efficiency  of your system. Phew “”” that was way too much thinking and way too many big words lol” Boat on bro”s   Stay safe “””


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Roadrunner

  • Karma: +12/-0
Re: overheating issue
« Reply #6 on: September 26, 2021, 11:35:57 am »
Does your driveline only contact the splines on the pump this much? Or was this a pic with the motor out?


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Roadrunner

  • Karma: +12/-0
Re: overheating issue
« Reply #7 on: September 26, 2021, 11:44:02 am »
It looks to me like you are using an RV water pressure regulator. That would definitely restrict water flow to a point where your motor would run hot/overheat. I would install a 2-3” long pipe coming straight off of the jet. Install a 3/4” gate valve. Then run your rubber hose to the T. High water pressure blowing out gaskets is a big deal on an Olds. You don’t want that gate valve wide open. Start at the halfway mark and aim for an idle temp of 160 degrees.


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BBF-ER

  • Karma: +0/-0
Re: overheating issue
« Reply #8 on: September 27, 2021, 08:36:17 am »
The driveline to the pump was like that when i got it. Does it look like that could be a problem? I will redo the water line with a gate valve. Thanks Roadrunner
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Roadrunner

  • Karma: +12/-0
Re: overheating issue
« Reply #9 on: September 27, 2021, 01:23:26 pm »
The driveline to the pump was like that when i got it. Does it look like that could be a problem? I will redo the water line with a gate valve. Thanks Roadrunner
Please post a pic of your entire driveline.


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96Laveycraft21Xt

  • Karma: +0/-0
Re: overheating issue
« Reply #10 on: October 14, 2021, 03:54:53 pm »
Any update? 

I had a 455 once that after about 6 months between having it on the water, the 2 - 90 fittings that went into the front water ports to the block had plugged with white powder.  Launched off the trailer, got hot, floated to the shore and started troubleshooting, found the problem, cleaned them out with a screw driver and slowly added water with a water bottle.  fired it back up and never had a problem again.
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