Re: When does a head need rebuilding on an F-20 ?

Posted by Pete L on March 03, 2004 at 13:31:27 from (198.36.89.4):

In Reply to: When does a head need rebuilding on an F-20 ? posted by Pete L on March 03, 2004 at 10:30:51:

Guys - Thanx for the quick feedback. The tractor, as purchased, would run well, spark advanced, under a heavy load at any speed. Remove the load, at any speed, and the engine misses 30-40% of the time, but those cylinders firing sound fine as an advanced spark timed engine should. Retard the spark to TDC, and it runs near fine, at any speed without the load. An overhaul was deemed necessary.

Yes, the engine had been torn down by myself for 2 sleeve replacements (due to water damage pitting), new rings all around (cylinder-to-piston tolerance well within specs now), carb rebuilt, mag rebuilt, valves ground (some seats were very pitted and marginally sealed), wet & dry compression test done and hovered around 60psi after rebuild, intake system tested for leaks and all is well, new gaskets upon overall reassembly, Autolite 3076 plugs, new wires, spark and valve timing was verified several times, spark checked with timing light on all cylinders and it is constant and steady. Upon starting up and running, the missing situation described earlier had not changed. All work had not affected the problem. A mag and carburator from a good running tractor were temporarily installed and the missing problem was still there. This ruled out the mag and carb as the issue. Am running out of things to check. All work done till now has not bothered the missing problem. When last run, I was noticing that as the tractor missed, a light "popping" was heard thru the carburator, but never a back fire. This link has lead me to believe I have a head issue. Yup, I'm aware of the manual oiling needed to the valve train and have kept it wet, along with replacing the wicks. With this feature, I can see worn valve guides as possibly being an issue. Also, during the regrinding of the valves, the head & valves were cleaned and valves hand ground in, but not professionaly, nor did I check them for warping. This is where I think my problem lies, and why I was looking for tell-tales on failing head operation.

With all this background, what's your thoughts now ?

Thanx for your time and thoughts.

Pete

Follow Ups:

• Re: Re: When does a head need rebuilding on an F-2 Bob Kerr 21:00:51 03/04/04 (0)
• Re: Re: When does a head need rebuilding on an F-2 Bruce 17:49:03 03/04/04 (0)
• Re: Re: When does a head need rebuilding on an F-2 F-man 15:17:07 03/03/04 (0)

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