Re: Here, Take a Poke at Me

Posted by captaink on October 13, 2004 at 07:29:20 from (66.115.214.56):

In Reply to: Here, Take a Poke at Me posted by Allan in NE on October 13, 2004 at 04:55:36:

Please see my post under “H engine broke in have oil question” that I put in yesterday.

I agree whole heartedly with Allen’s band-aid analogy of using heavier oil to bolster oil pressure. Doing so probably will cause more harm, and may mask more severe problems such as worn bearings, leaking oil pump gaskets, or warped or worn oil pump parts. Before putting in that heavy oil to bring up lackluster oil pressure, ask yourself these questions:

1.) Is the weather so hot that I don’t feel comfortable using a multi-weight oil such as 10W-30 (viscosity of 10 weight on start up, 30 weight after oil reaches operating temp).
2.) Is low oil pressure the only reason that I’m adding heavier oil? Oil pressure at idle above 25# hot is sufficient for any engine I’ve ever seen.
3.) If the answer to #2 above is yes, do you really want to take the chance that the oil pump is not the problem?

If you still want to put in that heavy oil, consider what might happen in the future if you do. If the oil pump has a bad gasket or is worn, lack of oil will cause premature bearing failure. This could result in having to tear down the engine, grind (or worse yet replace) the crankshaft and/or possibly connecting rods and if left go long enough replace the camshaft and lifters as well? Worst case is that the bearing will seize on the crank, snap the connecting rod and toss it out the side of the block. Hmm…

Sorry to sound like a lecturer, but bad oil pressure is caused by a problem somewhere in the engine. My “M” once had bad oil pressure, almost nothing at idle, and half gauge at full throttle warmed up. I took the pan off and found a bad connecting rod bearing. I got by with a .010 crank grind and new crank and camshaft bearings. (While I had it apart, I re-built the whole engine, but really wouldn’t have had to do the pistons and rings.)
Think about the old addage "A stitch in time saves nine."

Lecture over.

Follow Ups:

• Re: Here, Take a Poke at Me Allan in NE 07:57:29 10/13/04 (0)

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