Another reason for the oil/coolant heat exchanger is about this time last year it was about 0°F. I cranked up my 7.4L and it was knocking really bad. Before I fired it up I had ran the 5,500w coolant heater for the normal amount of time, then continued to run it for about 5 minutes. Because I thought it might be air in the lifters. After it didn't go away I figured it could be a rod bearing.
A few days later when it was 40°F I went to fire it up to trouble shoot the knock and it was gone.
It was a collapsed lifter that was full of air.
Later when I tore the engine apart I found an air bleeding lifter oil galley plug had been clogged up with a chunk of oil sludge. So the air could only escape from the lifter oil galley when it was some what mild out.
So cold oil does you no favors.
Now I will be able to use the inherent power of my 5,500w coolant heater, and/or my two 600w engine block heaters to help warm the oil.
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 4th Gen disc brake fbody rear end.
Last edited by oil pan 4; 01-11-2017 at 11:39 AM..