CUB CADET 1000

[spankyscamp]

Rebuilt k241 (oil ring stuck). now runs hot and valves will not keep their clearance. Replaced rings, gaskets, cleaned everything. ran about 30 min.
then the problem started. Right after. cut grass till engine got hot then loss
of power. let cool, checked clearance and it was to wide. Reset ran again
same thing. yesterday took head off, had carbon, cleaned, lapped valves,
reset clearance. ran it and the same thing happened.

 

[ILENGINE]

Flywheel key sheared, camshaft not properly times to crankshaft, points not set correctly, and in some cases reuse of head bolts can all be possible issues.

 

[spankyscamp]

Flywheel key not sheared. Camshaft is in line with crankshaft mark. Points are set correct. If all of this was wrong, why would the valve clearance be changing.

 

[Auto Doc's]

These K241s are not as critical about loose valve clearances as the newer OHV rocker style engines. Being that it has had repeat overheating, the valve seats could be slipping in their machine fit grooves of the block (rare).

The overheating issue is likely due to a lean fuel mixture. Dirty main carburetor jet? Intake sucking a little air where it mounts to the head? Main throttle shaft has too much play from many years of use?

Or the exhaust is carbon choked from age and the previous oiling issue.

Are all of the sheet metal covers installed? They must be in place so the flywheel cooling fins can circulate proper airflow while the engine is running.

I serviced many of these engines when they were new back in the early 80's.