c1802362

Member
My "41H has started smoking intermittently. Its either the rings or valve guides, based on the fact the engine still pulls strong and doesn"t miss - it just blow smokes at me on and off - it doesn"t seem to make a lot of difference in load.

The tractor S/N has an X3 designation, which suggests distillate. I"ve run it on 87 octane for the last 10 years. Don"t think the engine was ever rebuilt or replaced, but if there"s a way to tell when I open the engine up, please share..

I"m leaning toward the valves, and was wondering what the collective thoughts are about head jobs - I"m used to automotive heads where I"d put in hardened seats, new guides, valves, and possibly springs (if it would be a performance engine).

Comment? Suggestions? Know of any good machine shops within 50 miles of Hartford, CT?

Art
 
If it smokes on start up, high vacuum conditions like coasting etc a good set of valve seals would probably help a lot . If you pull head, original pistons were cast iron, 3 3/8 bore, next was aluminum 3 3/8 and then later thin wall sleeve 3 7/16 bore aluminum. It most likely has been apart a few times, maybe several and needs to be pulled down again.
 
Repair the H head same way you do an automobile head; guides, hardened seats, etc. Springs are not as strong since the engine is supposed to run less than 2000 RPM.
 
Use a leak down tester just like diagnosing an automobile. That will tell you exactly what needs to be repaired or replaced! Good luck.
 
Absolute nonsense! A leak down test will not show bad guides, broken valve springs or worn camshaft lobes. Very few test s are defiitive. They will tell if a part is bad, but not if the part is good.
 
thanks to all - I'm guessing valve guides based on 25+ years of automotive rebuilding. I've only used leakdown type tests to check for valve seating problems. Sometimes it smokes on startup - sometimes not...

Art
 

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