Mechanics

CHEVY CRATE ENGINE WITH LOW OIL PRESSURE

2000 Chevrolet Truck

Engine Mechanical problem
2000 Chevy Truck V8 Four Wheel Drive Automatic 128 miles

This motor only has 128 miles on it with a short block. The oil pressure dropped from #40 tp #10 and I imediatly parked it. Upon ck. Ing the dip stick it showed 3Qts. Low. Filled the motor oil to normal and now only have 20# of oil pressure. Could I have spun a cam bearing or what. I was told the installer was suppose to break in the camshaft. What's involved in breaking in a camshaft. What other problems could be lurking. Is it possible that the engine was rebuilt with wrong size pistons and/or rings.
With all the brand NEW cars and trucks I've bought over the yrs. I've never had a problem with break-in.
Any and all replys will be greatly appreciated as I'm at a lose as to what's next.
Thank you in advance
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OLDMAN100
March 4, 2009.



I'm sorry to hear that, you have some very serious problems, until I get some more information, I know just about as much about it as you, I will make you a list of some of the questions I need to know.
1. Did you have any head work done? And if so what?
2. Was the engine rebuilt at a shop? Or do you do it? Or one of your friends?
3. Did you use the same block? And if so how many miles did the engine have on it? And what did you do to the block? Did you use new pistons?
4. Did you put a new cam and lifters in?
5. What kind of oil are you using?
Those are just a few questions I need to know and anything else you can tell me.
Now to answer your question about the cam " I was told the installer was suppose to break in the camshaft" that is untrue, the cam shaft breaks in on first start up, after about 15 minutes of running, and the assembler should have used a special grease, to lubricate the cam for Break-in. Now to answer your oil pressure problem, the vehicle only holds 5(five qt.) The pan holds 4 (four) and the oil filter holds 1 (one) so if you had to add 3 (three) that means you only had 1 (one) in the pan, I'm sorry, that's not good enough, what you have probably done is damage the bearings, not necessarily spun one, if you spun a bearing you would have no oil pressure, but if you've damaged them, you have cut the life of that engine, by over 1/2 (half), what I suggest you do, it is drop the oil back out of it, and the filter, and installs straight 50W weight, if your oil pressure increases, you have damaged the bearing.

Dr Loot
Mar 7, 2009.