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V8 Jetboat Noob
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Discussion Starter #1
Trying to figure this out, coming from stern drives.

My hot-rodded (by others) Rally Sport Hombre has a water valve, then a spigot coming from the right side of the berkely at the transom. From there it tees to the front of each Nicson manifold.

I tried closing the valeve from the jet drive transom and [gravity] feeding RV antifreeze into the spigot, but only a little went in (and none seems to have come out!?).

I'm guessing that the jet feeds the water jacket by way of the manifolds (which seems backwards), and then the water dumps into the back part of the manifold?

Am I going to be able to gravity-feed antifreeze at all? Can't figure out any other way.

HELP! Feezing weather is here. Had the boat for a couple weeks only.

Thanks,

Dave
 

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Raise the nose of the boat so that everything will drain properly. Take the engine water inlet hose loose from the jet drive. Pump the antifreeze in with a bilge pump until it comes out of the exhaust antifreeze color; OR, add a piece of hose to the engine water inlet hose, (extend it somehow), to where you can raise the hose above the engine level. Then you can use a tranny funnel and gravity feed the system until the water coming out of the exhaust turns antifreeze color.
 

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Pump It Thru

I used one of these pumps I picked up at Home Depot, worked awesome. I have the same setup on my Spectra with a Berkeley. Run it till it dumps out the pipes.
 

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V8 Jetboat Noob
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Discussion Starter #4
What about the Thermostat?

Does the presence or absence of a thermostat have any impact on any of this? Seems like it would.

I did run it with the antifreeze gravity feeding from a tank, and some antifreeze came out the left but not the right exhaust, and continued to drip/flow. The temp gauge crept up slowly to 135ish, then rapidly from 135 to 180+ (where I shut down to prevent damage. Not sure what that was telling me :(

Dave
 

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Does the presence or absence of a thermostat have any impact on any of this? Seems like it would.

I did run it with the antifreeze gravity feeding from a tank, and some antifreeze came out the left but not the right exhaust, and continued to drip/flow. The temp gauge crept up slowly to 135ish, then rapidly from 135 to 180+ (where I shut down to prevent damage. Not sure what that was telling me :(

Dave



assuming I'm reading right and assuming your water outlet (top of the intake manifold) has only two outlets (or is an older Berkely packajet deal) you don't or shouldn't have a thermostat at all and the jet is the "waterpump" and supply for the engine while underway , running out of the water the boat would get hot quickly running with simply the water (or coolant) present in the block, heads and manifolds
 

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When I have one that dumps on one side like that and not the other, I take a pair of vise grips and pinch off the hose to the riser on the side that was dumping until if runs out the other side too.
 
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