shawn

Guys, thanks for the input, but my question involves the thermostat in the oil cooler, not the engine. What temp is it set for and do they need replacement?

thanks
Shawn

JaayTeee

The thermostat in the oil filter housing
should be fully open at 210*.

You can test it like I made mention of
earlier in the thread.

z.zuperboat

Now Who Has An Oil Thermostat At A Reasonable Price.

JaayTeee

Just so we're on the same page, here's a picture:



http://www.mercruiserparts.com/Show_...ER+AND+ADAPTOR

item # 2 is the "thingamajig" we're talking about

shawn

JT, that's the puppy I was talking/writing about. Before I put the crossovers on, the oil ran around 180/190 up to 200/210 at WOT, but since the engine thermostat has been removed, the oil temp doesn't show above 140/150, but there is no sign of moisture in the oil. I was just wondering if it should be replaced along with the spring?

Thanks
Shawn

Mudball

The water temps have a direct bearing on the oil temps.

Without a water thermostat and with little to no water temps, it takes forever for the oil temp to come up, and it won't stay up.

BTW: I believe my oil thermostat is 180 degrees. If it goes above that during a romp, it quickly drops back to 180, and then slowly drops from there if I go slow. It will drop down to 140 or lower after a while.

Kent

miamioffshore

Shawn,
Were you able to remedy this problem? If so how? I'm experiencing same symptoms with my hp500's

Mudball

I assume you are running crossovers, MOS.
===
Running a water thermostat and the Merc Racing pressure relief valve did the trick for me!

I have been running it for about a year now.
My setup:
1. EMI crossover WITH a bypass.
2. 140 degree water thermostat with three x 3/16 holes drilled in them just inside the lip for steam ventilation.
3. Merc Racing water pressure relief valve with a 1" dump.

The valve I have limits the pressure to 25psi. This is a MUST have item.

As I mentioned before, and as I'll bet Shawn found out, the oil temps are directly influenced by water temps.

Now, my water temps never go over 140, and get there quickly. My oil temps also warm up rather quickly, and run around 180-200 at cruise, and up to 220 at WOT. They will come back down to 180-200 fairly quickly after slowing. I have never seen above 220.

Please note that if you want to run a thermostat with a crossover, you MUST have the bypass (hose between the thermostat housing and the water intake to keep water flowing to the exhaust when the thermostat is closed.

What is interesting is that none of the crossover makers will even acknowledge a water pressure problem when running a thermostat!!!

Kent

vandeano

Mudball,

Where did you get the hose that goes from your water bypass down and under to your coolers? By the way sweet looking motor...

Mudball

Thanks, Vandeano...

I assume you mean the stainless piece going from the crossover to the P/S cooler? If so, that is from Jegs. It is a radiator hose for cars that comes with adapter rubber pieces that make it fit..
Actually, that is no longer on the motor. I wouldn't recommend it, even though it looks cool. It is actually the hose that would blow off before I installed the pressure relief valve!! So, in a sense, it is what saved the motor from sure head and/or intake gasket problems!
Kent