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After two months I finally got my 5.0 block from the machine shop. I unwrapped the block today and put it in the stand. Started wiping it down and became more and more disappointed.
Machine shop guy told me the block was in good shape and needed only a hone job. #8 looks like it maybe needs more.
That's the remnants of rust from when the guy parting out the Explorer engine dumped the residual antifreeze into the cylinder last winter. The rule represents the limit of travel of the second ring.
On the top end of the bore, and in most other bores is an un-honed spot. Machine shop guy said these spots "don't hurt a thing".
The machinist always had the green light to do whatever was required for a good job.
I'm with Paul. There's no reason he shouldn't have bored that. I could see if there was very tiny marks, or just the faintest line from the ring ridge at the top of the cylinder, but I don't think this is acceptable.
Windsors have really short pistons.
The pistons rocks in the bores and that
leaves offset ring ridges.
If a skirt cracks the piston nearly
turns sideways.
I have had several bad 302 351 blocks.
The area of many little pits is near the bottom of the cylinder, so the rings will travel over it after the highest pressures, and power production, have passed. It would be interesting to assemble the engine as is, and do a compression test to see if it really matters.
I would run it as is, trusting the "expert opinion".
The area of many little pits is near the bottom of the cylinder, so the rings will travel over it after the highest pressures, and power production, have passed. It would be interesting to assemble the engine as is, and do a compression test to see if it really matters.
I would run it as is, trusting the "expert opinion".
That motor sat up a long time with the pitting at the bottom of the cylinder. That area isn't a real concern, but the area at the top is. That was caused by hard rings and needs to be bored to get rid of the wear, otherwise the new rings aren't going to last long and will break from being work hardened as they flex in and out of that groove. Oh, and I'd find another machine shop that's more competent in their work.
The area of many little pits is near the bottom of the cylinder, so the rings will travel over it after the highest pressures, and power production, have passed. It would be interesting to assemble the engine as is, and do a compression test to see if it really matters.
I would run it as is, trusting the "expert opinion".
What a timely resurrection of this thread! I just started a new one today regarding break in.
Oh, and I'd find another machine shop that's more competent in their work.
I believe that they are a very capable shop. I also believe that for some reason, he decided he didn't want to work for me.
New thread on Break In HERE
