speedfever

I have a 1997 35' fountain with twin 500hp carb motors. The oil temp on my port motor runs about 215 at normal running and the water temp is at 130 degrees. Starboard motor oil temp runs about 180 and the water temp is 130. Last year it was fine. Today is the first time I had it in the water this year. Is this a gauge problem or a sending unit problem. Where would the sending unit be ?

Budman II

Switch gauges or sending units, and if the elevated temp follows it, you have found your problem. I would also check to make sure there is not a restriction in the oil cooler on the one that is running hot. Is it running oil T-stats? If so, one could be sticking closed.

Budman II

Also, I think the sending units are mounted in the remote oil filter pad on the HP 500's.

MILD THUNDER

Sounds like you may have a issue with the internal oil thermostat on the HP500. Your port one may not be opening properly

MOP

215 is not high, several oil garu's say 240-250 is where it should be under 200 is way to cold. Check with Chachi on the Dnet he is very knowledgeable he has worked for Specto Oil for man years, they make some very good racing oils.

MOP

Called Ken Chachi the temps I posted and run my stoker at are correct and are far more beneficial to the life of your engine, cold oil makes for the white goo in your valve covers which over time leads to broken springs we know where that leads!

speedfever

I was assuming that the 215 degrees on the port motor was high but after reading other post about oil temperature, it seems that 215 is ok and it is the 180 that is to low. I swapped the gauges and the problem followed. I bought 2 new gauges and will install this weekend and see what happens. I also swapped the sending units and nothing changed.

blue thunder

The problem w/ hp boat engines often is if you start at 240f oil temps cruising, after a wot extended blast you will be 280f or more. That is why they need to run cooler, like 200f cruise to give room for the wot blast.

Kidnova

That, from the high oil temp king LOL

blue thunder

You got that right old buddy. I'm a legend in my own mind )