5-5
BREAK-IN OPERATION
An
engine 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 back 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.
While the engine is being tested, check for oil leaks.
Make final carburetor adjustment and regulate the engine operating speed.
I
Steps
Load Engine speed Time
Step
1
60
min
3000
rpm
4.0
HP
Step
4
30
rnin
3000
rpm
2.0
HP
Step
3
10
min
3000
rpm
No
load
Step
2
10
min
2500
rpm
No
load
-
40-
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