Marinette Boat Forum

Hi all wonder if I my get some help with an intermitten heat up problem
History-88 twin 360s.last weekend return trip port guage showed temp rising then hold at 200.shut down and returned on starboard motor.
replaced thermostat,same issue after running various rpm at dock. Replaced temp sending unit.Same thing.Replaced raw water impeller same results
Checked temp w heat gun ,verified guage was fine.temp gun showed only running warm on left side of motor.
warmer closer to front of motor near sending unit. where do i look next
Thanks Goby

I would back flush engine. Sounds like a piece from previous damaged impeller is clogging the flow.

Roger

This is why its important to have a signature.
I think you have a 1988 somekindofboat with twin 360's
Raw or Fresh Water Cooled (lake or ocean water running thru engine or self contained anti freeze like a car)
Do you have a good flow of water out the exhaust
bill

1988 Fisherman-Twin 360-freshwater raw water cooled.Appears to have plenty of flow at exhaust.
Have tried to post signature with no success.
Thanks for your help.
What is the,process to backflush
Goby

Goby - at upper left of page under the Board Index button is the User Control Panel. Click it, then the edit signature tab where at the bottom right you'll see a box to enter your descriptive/signature info.If you're tried that and your signature doesn't doesn't display, post a note for Admin Joe Howard.

Meanwhile, you reported you have "freshwater raw water cooled" engines. It should be one or the other.

I meant fresih water lake Erie as,opposed to to salt

If all the above in in proper order...

Check your intake strainer gasket and o ring (on the old salad bowls)

Had similar issue couple seasons ago and that was the problem. It was such a small air leak I did not notice it until very close inspection.

Mine on Port would start to warm up as I increased rpms. Never overheated but got up around 200. Drove me nuts until I found the air leak.

good hunting!

safe boating,
dave

goby wrote:I meant fresih water lake Erie as,opposed to to salt

Nice sugnature
I will assume your fisherman is a 32'
You may want to check all you hoses and clamps coming from the "salad bowl" to the pump.
While you down there, pull the hoses off the heat exchanger for the transmission and back flush it with a garden hose.
bill

Thank You to All for your valuable input!
It is really great to be able to receive help from the Forum.
As it turns out the problem was remedied by cleaning the "salad bowl" rim ,gasket, cover and making a tight closure on the cover.
Thanks for your suggestion Barkley Dave
Goby

Thanks for the signature.
bill