Reassembly Procedures WM 130/170/270 Repair
wc_tx000379gb.fm 78
9.32 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.)
WM 130 WM 170 WM 270
1 No load 2500 10
2 No load 3000 10
3 No load 3600 10
4 1.5 hp 2 hp 3.5 hp 3600 30
5 3 hp 4 hp 7 hp 3600 30
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