Chevy 250 Cid engine problem...UPDATE

Posted by Mike Burdick on July 29, 2005 at 17:27:34 from (67.4.47.60):

Hi,

For those of you who are interested I have an update as to my problem with a 250 chevy engine.

My original post:
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I have a pickup with a GM 250 Cid engine, 6 cylinders – carburetion.

About a week ago it suddenly started running badly and then I noticed the oil pressure gauge dropped to zero. I immediately shut the engine off and towed the pickup back to the ranch.

A couple of days later I had time to look at it and started it. The oil pump immediately had the required pressure but the engine still ran badly – like it was out of time. I retimed it (it was okay by the way) and started it but it still ran rough.

I took the compression in each cylinder and all were even and within specification. I removed the pan and looked at the oil pump and it was fine.
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The problem turned out to be a broken push rod. It had broken off the tip of it which is about 3/16".

I guess it had just enough movement to allow the valve to move just a little thereby giving a passing compression test.

What gets me now is the loss of oil pressure. Could the broken lifter have caused the momentary loss of oil pressure?

Thanks everyone....

Mike

• The original thread...

Follow Ups:

• Re: Chevy 250 Cid engine problem...UPDATE Redmud 19:18:04 07/29/05 (1)
  • Re: Chevy 250 Cid engine problem...UPDATE Mike Burdick 20:03:38 07/29/05 (0)

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