Mercury Racing Remote Oil Filter
 

How do you know which line is out and which is the return on a remote Mercury oil filter unit????

Re: Mercury Racing Remote Oil Filter
 

Assuming you mean the oil filter t-stat unit used on the HP500's?

Ports on side with t-stat unit :
Port closest to the mounting plate= OUT to cooler
Remaining port closest to filter= IN from cooler

Ports on Bottom of unit:
Port Closest to mounting plate= IN, from block pad's offset center pad(Out from oil pump)
Remaining port closest to filter=OUT, on to the center port at the block pad.

Re: Mercury Racing Remote Oil Filter
 

US1
Thanks for the info. That is what I was looking for. I failed to mention the lines which fed the oil cooler.
Do you know what temp the stat is to open?