Posted by RN on October 01, 2008 at 07:21:39 from (96.60.81.245):
In Reply to: Head gasket on Cub posted by razimm on October 01, 2008 at 06:59:36:
White smoke is probably oil. Warm up and smoking stops- valve guide/valve stem clearance being reduced when warm or rings/piston clearance reduced when warm to stop the oil burning. Rebuild 2 years ago- how much heavy work has it gotten since then to seat rings? Did you put in new valves and guides or just grind and lap valves and seat? Knurling valve guides -accepted rebuild practice when not replacing guides- reduces oil consumption at startup a bit. Side valves without cup seals can normally smoke a bit when cold- old Harley G trikes and UL, Ks normally had white puffs when cold, Briggs and Tecumseh iron blocks also, Flathead Fords same. check radiator for oil film but probably the crankcase is dropping oil level just a bit- valve guides or a bit of gas indication is ring seating not quite complete when cold. Rings not seating would have some smoke when warm- I would check valves first. RN
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