Posted by Matt Weltz on November 06, 2007 at 11:43:05 from (12.216.122.181):
I have a big-block 360 in a friends farm truck that is a total nightmare!!! I rebuilt the motor last June with a basic .060 over rebuilt kit. Got the motor back in the truck and had it running for about five minutes. At that time, there was a loud snap and we immediately shut it down. I pulled the motor back out and apart to find that the Melling oil pump had locked up and the snap was the oil pump drive shaft breaking in two and falling into the oil pan. Replaced with a high volume Melling pump and HD drive shaft. Also checked all bearings again to make sure there was no damage. Got the truck going again and it ran great until about a month ago. Friend brought truck back to me saying it wasn"t running good and had a knock. Turns out the ignition coil went bad and the charging system was no longer working. Replaced the coil, battery, alternator and voltage regulator. Upon further inspection the two-piece harmonic balancer had deteriorated and needed replaced. Then assumed the knock (only knocked at idle after warmed up) was probably the front main bearing. Pulled the pan and plasti-gauged the main bearings twice again. Ironically, they were all still good along with the rod bearings that were also checked at that time. Put the pan back on and drove the truck around (knock is now gone). After a good 30 minutes, the truck was good and warmed up and I noticed that it was showing no oil pressure at idle. Shut down again, pulled pan and removed oil pump. Had the pump tested and it was bad! Now have replaced with a Federal Mogul high pressure pump. When truck is first started up, it has about 80lbs. of pressure and half an hour later it has 12lbs of pressure at idle (reading from manual pressure testing gauge - not gauge in truck dash). Truck is not leaking or burning oil so not sure why pressure is so low. Sorry for the long post but justed wondered if you guys had any ideas and wanted you to have the full story. Thanx!!!
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