Re: fouling advice

Posted by Allan In NE on February 27, 2007 at 11:44:08 from (148.78.243.26):

In Reply to: Re: fouling advice posted by the Unforgiven on February 27, 2007 at 11:12:31:

Nope,

Not trying to be a Doubting Thomas or anything, but there is nothing worse than a junk-yard fix.

If you just replace the rings, you are only re-newing 1/4 of the wear surface. That tiny little outer edge of the ring that touches the sleeve wall. Now you've got a new surface wearing against an old surface.

The upper and lower land surfaces of the piston ring groove are still worn, the skirt is still worn, the wrist pin is still worn, the sleeve wall is still worn and odds are that the wall is wavy, egg-shaped, bell-mouthed and out-of-round anyway.

Rest of the story is that when you tighten up the top end, shortly there after the bottom end goes because it can't stand the extra pressure.

The deck is totally stacked against this kind of a repair. Do it right the first time and it will outlast both you and I put together. :>)

Now, in your case where you had a head crack and fail, I'd first check to see if there is any shake in the pistons and how much of a lip there is at the upper stroke of the ring.

Then if that area seems okay, I'd pull the pan and inspect the bearing inserts. If they are really, really in good shape, good and beefy and you feel that they are good to go, I'd just throw the head back on 'er and leave that cylinder area completely alone.

Simply putting a new set of rings in could make it worse than it was, not better.

Allan

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