SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: kasanator714 on August 30, 2017, 10:29:51 AM

Title: Overheating
Post by: kasanator714 on August 30, 2017, 10:29:51 AM

454 BBC is overheating. Bassett T is fine. Need to replace some anodized blue fittings if anyone has any suggestions on where to get them cheap please let me know. Also going to replace the gate valve because it was corroded and full of calcium build up. Found out it never had a thermostat so wondering if we should put one in or leave it without one. Looks like the water lines are clear of any debris. Still can't tell where the main cooling issue is coming from. What else should we check?? Email me @ Kasaundra_shep714@yahoo.com
Any help would be appreciated


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Title: Re: Overheating
Post by: dat1dsm on August 30, 2017, 11:18:54 AM

I had similar problem when I first purchase my hull. Tried replacing all the lines and Basset T and valves. Ended up being my jet was shot. Guess previous owner forgot to mention the impeller was wore out and ended up carving into housing. Not saying that's your problem but something to look at.   

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Title: Re: Overheating
Post by: TrollerDave on August 30, 2017, 01:14:42 PM

For AN fittings, a lot of people use G and J in Ontario.
http://www.socaljetboats.com/engine-mechanical-electrical/steel-braided-line-20839/msg237170/#msg237170

I'm sure there are places closer to HB, just look up steel braided hose or AN fittings.

Probably about 98.75365976% of jet boats don't run a thermostat. If you really want or think you need one, do it after your overheating problem is dealt with.

When your boat is running, do you have a strong stream of water coming out of the dump line?
Is this something that just started happening? Does it overheat quickly after you've launched?
The build up on the gate valve "might" be enough to cause the problem. Is the valve on the jet or the dump line?

Sometimes sand can build up in the water jackets around the cylinders. There should be some plugs (3/8 pipe I think) on both sides of the block. You can take those out and run water through the block and flush out any sand or debris. Don't let water go to the headers.

Title: Re: Overheating
Post by: SomeThingWilder on September 01, 2017, 11:39:19 PM

Sweet Performance in Placentia will have every/ any AN fitting u will need. and he's an old boat/car racer so his knows exactly what u want and need

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Title: Re: Overheating
Post by: herrhauptman on September 04, 2017, 09:52:26 AM

I assume it is a jet boat. I have seen this before, and if not fixed it could destroy your engine. If the bearing starts to go in the pump, it lets the impellor start to machine it's way forward in the suction piece housing. It fills the water intake with debris and causes overheating. Eventually it works it's way forward far enough that it pushes on the crank and takes out the main bearings.

Title: Re: Overheating
Post by: dat1dsm on September 05, 2017, 12:26:11 AM

Quote from: herrhauptman on September 04, 2017, 09:52:26 AM

I assume it is a jet boat. I have seen this before, and if not fixed it could destroy your engine. If the bearing starts to go in the pump, it lets the impellor start to machine it's way forward in the suction piece housing. It fills the water intake with debris and causes overheating. Eventually it works it's way forward far enough that it pushes on the crank and takes out the main bearings.

I know that for a fact lol. Happened to me

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Title: Re: Overheating
Post by: kasanator714 on September 07, 2017, 09:32:52 AM

If anyone is willing to come take a look at it cuz i don't know too much about it. I live in hb.


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