Posted by Billy NY on November 02, 2008 at 06:44:30 from (205.188.117.74):
In Reply to: Re: Ford 800 Head posted by Homerville Bill on November 02, 2008 at 06:06:24:
Not sure why such a grumpy response, what he is saying is to do the job right, that is once you determine that 172 4 cyl is worn, and you want to do a rebuild, it's best to do a complete job if possible, all the measuring is going to confirm what you have, then you can determine what is out of tolerance, what to do to correct it, which may entail a rebuild. Some of those 172's are sleeved/ have liners, I think the earlier ones with a diamond on each side of the serial number above the starter, on the flat spot on the transmission.
Now you have shed some light on something and no one has responded to the gas odor in the oil. Gasoline thinned oil will cause damage, oil is thinned out, depends on how much gas, but with excessive carbon soot out the stack, you have a fuel system issue, maybe it's not thinned enough to cause a failure, but it could be accelerating internal wear very easily. Not sure what this engine does when out of time, I'd check the timing as well. Thinned oil is going to get past the rings, could wash the cylinder bore, not an expert but it's not good, not sure if it could glaze the cylinder bore, then the bottom half, engine main bearings and gas thinned oil not a good comination, solve the fuel problem with the carb, change that oil out and see how it runs.
Aside from the valve and seat, the mating surface of the head should be checked to see if it is warped, and you may want to have the head magnafluxed to check for cracks, hairline fractures, prior to reinstalling. Again, not an expert on any of this, I've seen bad results from just doing the top half of a motor, where things are mismatched, compression comes up, engine gets worked hard, but the lower half is worn and can't take it, and fails. Lot of variables with this, so once you take something apart, I think it's a good idea to do the right job, measure all components and know what is what.
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