Posted by jdemaris on February 08, 2008 at 15:10:50 from (67.142.130.14):
In Reply to: Valve removal? posted by Paulinkansas on February 08, 2008 at 08:28:07:
Kind of too late now, but it's pretty easy to put in new valve seals without taking the head off. Just hook and air-line to a spark-plug hole to keep the valves from falling in, and take the retainers off - one cylinder at at time.
In regard to valves making smoke at start up - yes but that is just one of the typical issues. Valve seals leaking will also cause smoke anytime the engine is running faster than the carb-shutter is open for - like when you hold yourself back coming down a steep hill with the trans in a low gear. Engine revs but carb-shutter is almost closed and the engine sucks oil through the valve-guides. Also, if an engine is heavily sludged up under the valve-cover, the oil-drain-holes can get plugged, it fills up too high with oil, it leaks through the valve guides, and it smokes all the time. This was very common back when non-detergent oil was common - and just about never seen with modern oils. Old diesels that used air-chokes for engine shut-offs were known for having bad valve-seal leak problems. Some older Mercedes cars would suck oil from the valve-guides and keep on chugging away when the air-choke was pulled.
Back to your tractor - since you DID pull the head - seems now you can look at the cylinderwalls and piston tops pretty close and see if they are scored, rings are loose, etc.
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