WM 90 Repair Reassembly Procedures
wc_tx000389gb.fm 71
8.20 Break-in Operation
A new engine or one that has been completely overhauled by being
fitted with a new piston, rings, valves, and connecting rod should be
thoroughly run-in before being put into service.
Good bearing surfaces and running clearances between the various
parts can only be established by operating the engine under reduced
speed and loads for a short period of time.
Run-in the engine according to the schedule below. During the run-in
period, check for oil leaks, make final carburetor adjustments, and
regulate the engine operating speed.
Step Engine Load Speed (rpm) Duration (min.)
1 No load 2500 10
2 No load 3000 10
3 No load 3600 10
4 0.7 kW (1.0 hp) 3000 30
5 1.0 kW (1.9 hp) 3600 60
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