(3) Tighten the oil pressure adjusting screw
(4) Remove the crankcase breather tube
locknut (8).
baffle (8).
d. Oil Pressure Adjustment.
(5) Lift out the breather valve (1) from the
breather cap (2).
(1) Start the lubricating unit until operating
temperature is reached.
b. Cleaning, Inspection, and Repair.
(2) Check the oil pressure on the oil pressure
(1) Soak the cap, valve, and crankcase
gage (18, fig. 21).
Under normal
breather baffle in an approved cleaning
operating conditions the oil pressure
solvent.
should be 20 to 35 pounds pressure.
(2) Wipe out the crankcase breather tube with
(3) Loosen the locknut (8, fig. 18) on the oil
an approved cleaning solvent.
pressure adjusting screw (9).
(3) Replace the tube, cap, valve, or baffle, if
(4) Turn the adjusting screw clockwise to
defective.
increase oil pressure or counterclockwise
c. Installation.
to decrease oil pressure.
(1) Install the crankcase breather baffle (8) in
(5) Watch the oil pressure gage while making
the crankcase breather tube (7).
the adjustment. After the adjustment is
(2) Install the crankcase breather cap (2) and
completed, securely tighten the locknut.
valve (1) in the crankcase breather tube
(7) and secure with spring clip.
127. Oil Drain Line
(3) Install the crankcase breather assembly in
a. Removal.
the cylinder block, and connect the short
(1) Remove the crankcase drain plug (9, fig.
piece of tube between the crankcase
23) and drain all oil from the engine
breather cap (2) and the air cleaner (3).
crankcase.
(2) Remove the oil line (8) from the
126. Oil Pressure Regulator
crankcase.
a. Removal.
b. Cleaning, Inspection, and Repair.
(1) Loosen the oil pressure adjusting screw
(1) Clean all parts with an approved cleaning
locknut (8, fig. 18) mounted on the
solvent.
crankcase.
(2) Inspect all parts for damaged threads,
(2) Turn the adjusting screw (9) out of the
external defects and internal obstructions.
crankcase.
(3) Replace parts as necessary.
(3) Remove the bypass spring and valve
from the crankcase.
c. Installation.
b. Cleaning, Inspection, and Repair.
(1) Install the oil line (8) on the crankcase.
(1) Clean all parts in an approved cleaning
(2) Install the drain plug (9) in the oil line (8).
solvent.
(3) Inspect the oil drain line for leaks.
(2) Replace the bypass spring if weak or
broken.
128. Clutch Adjustment
(3) Replace the valve if damaged.
a. Stop the engine and disengage the clutch lever
(6, fig. 30).
(4) Replace the adjusting screw if the threads
are damaged.
b. Remove the top plate (13, fig. 20) from the
clutch housing (7, fig. 30), by removing the four screws
c. Installation.
(14, fig. 20) which secure the plate to the housing.
(1) Install the bypass spring and valve into
c. Turn the plate by hand until the adjusting
the crankcase.
(2) Install the adjusting screw (9).
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