i have a 160 t-stat and just ordered a 140.i heard og people drilling 1/8 inch holes in the stat.where do you drill the holes and why.and my thermostat housing has no spring loaded balls at the end.is this a problem?

You drill the hole if you have a crossover. Changing the thermostat to 140 will not accomplish much. It will open at 140 instead of 160. 140 is to cold to be running an N/A engine. What is your current water temp, I read all the postings and never saw it. It started with oil temps to high, and now talkin about water.

water temp is 150-160.if i can lower water temp won't it lower oil temp also?

Some of your increased oil temp is probably due to your motor running leaner due to the ethanol in the fuel. You need to increase jet sizes or change metering rods depending on what carb you have.

Maybe your cooler is rigged like mine was?

liquid tell me you are joking

Back to your problem, it is only high oil temp?
What temp did the oil run before?

If it jumped from 220 to 300 there is a problem and I don't think you are going to find it in the oil cooler, you might want to cut open your oil filter and see if there is any metal in there. That would cause high oil temps

The blocked tubes also speed up the water through the rest of the cooler, making it that much less efficient.

No joke here...that is what we found when we pulled the motor!! The fuel cooler was as big a mess. Classic case of buyer beware.

my temps have always been high since i bought the boat last year.found impeller pieces in cooler last year and it seemed like it took longer to get hot after i backed flushed the cooler.when i replaced the sea pump all i replaced was the impeller.should i replace the plastic housing and wear plate too?have good water psi.my sender is in the filter housing before it goes thru the cooler.