Last year I installed HP 500 oil thermostats on my motors and could not get them to woik. I tried to plumb them both ways and got the same results. Contacted Mercury Hi Performance and they could give me no help. My oil temp,never warms up at idel likes it's suppose too. Any ideas?

What do you mean both ways? There is only one way. Are you running a water t-stat? Crossover?

Try this


http://www.offshoreonly.com/forum/sh...ghlight=filter

Running crossover, Should of stated that motors are not Mercruiser's. What I meant by both ways was from the oiler coolers to thermostat have installed oil lines on both sides of cooler. I have a twin engine application and have 1 motor set-up one way and the other reversed and get the same results, NO HEAT TO OIL. I hope that makes some sense.

D&A

You using a t-stat with your x-over? Are you even getting water temps? Both motors are running the same temps, oil and water? If no t-stat or bypass hose, very possible you are flow too much water and not building up enough engine heat which is keeping your oil temp low. This would be my guess on your setup given your cool temps. Is this just an idle condition or all around? Has it ever worked?

If what you mean both ends of the oil coolers, I assume that means you just swaped the 2 lines on the cooler itself. That will really make no difference in itself.

Just so we are on the same page. Your oil filter /t-stat unit------the square black aluminum block that also mounts the oil filter and has 4 oil lines going to it. Right? Just so we are not talking about just a remote filter unit. Are your lines hooked up correctly? The 2 on the side with the cap and snap ring, go to the cooler and makes no difference which goes to which side on the cooler. All you are doing by swapping these 2 lines around is flowing oil the other direction thru the cooler itself. It's not changing anything else.
Are you sure that the t-stat itself is not stuck in the full open(cooling) position? Course for them both to be like this.......

Yes we are talking about the cooler not just the remote filter housing. Have not tried to check the thermostats yet because still winter and motors are out of boat. I do plan on checking the thermostats. Just odd that everthing I do I get the same results on both motors. Both thermostats were brand new and who might think the thermostats would be bad on both units.

I quess that's a draw back living in a cold weather climate. Have to wait till the spring to find out what changes you make over the winter work. If they don't work I suppose we have all summer ( 3 Months ) to try and figure them out.