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 TM 55-1905-217-12
c. Installation.
(4) Remove the jam nut from the bolt and
save the nut; then, thread the bolt back into the flywheel
(1) Affix a new gasket to the flange of the oil
until the end of the bolt just contacts the forward clutch
pump body.
piston.
(5) Remove the remaining emergency
NOTE
engagement bolts and jam nuts, and reinstall the bolts as
outlined above.
The oil pump to flywheel housing gasket and the flywheel
(6) Tighten all of the bolts uniformly, thus
housing small hole gasket are very similar in design.
locking the forward clutch plate (47) between the piston
When installing a new oil pump to flywheel housing
(3) and the drive plate (4). Install the starter in the
gasket, be sure to use the proper gasket to prevent oil
flywheel housing.
leaks. The oil pump gasket has an inside diameter of
approximately 3 17/32 inch.
NOTE
(2) Position the oil pump assembly in back of
The emergency engagement bolts must be tightened
the flywheel housing as shown in figure 4-57. Then, with
uniformly to prevent bind between the close-fitting piston
the teeth on the drive coupling hub in position to mesh
and the bore in the flywheel.
with the teeth in the drive coupling, place the pump
agains the flywheel housing and secure ion place with
bolts, lockwashers, and nuts.
NOTE
(3) Complete the installation in reverse order
of removal.
When the emergency engagement bolts are engaged,
(4) For hulls 8540 thru 8560 and 8580 thru
do not use reverse drive or the gear will be damaged.
8598, adjust a newly installed transmission hydraulic oil
pump as follows:
4-70.
Transmission Oil Pump
(a) Remove the allen head plug in the
transmission oil filter.
a. General
(b) Insert a pressure gauge (300 psi
(1) Oil pressure to operate the forward and
min.) at the filter.
reverse-clutches of the torqmatic marine gear is provided
(c) Remove acorn nut and back off
by a positive displacement rotor-type oil pump mounted
locknut of the pressure regulating valve on the pump.
on the rear face of the flywheel housing. The pump is
(d) Back off the regulating valve
driven by the blower drive shaft through two hubs and a
adjusting screw to the left.
coupling.
(e) Start the engine.
(2) For hull numbers 8500 thru 8539 the
(f) Insert a screw driver into the slot of
pump has a constant flow control valve incorporated with
the adjusting screw and turn clockwise until the pressure
the pressure relief valve, forming a constant flow and
gage reading is 180 PSI.
relief valve assembly. At all engine speeds, the oil flow
(g) Lock adjusting screw with locking
is approximately 6 gpm. For hulls 8540 thru 8560 and
nut and install acorn nut.
8680 thru 8618, the pump relief valve is factory adjusted
(h) Stop engine and after a few minutes
and permanently closed.
carefully remove the pressure gauge and install the allen
(3) Pumps are built for right-hand and left-
head plug to the oil filter.
hand rotation depending on the engine model on which
(i) During the adjustment cycle the oil
they are used. The direction of rotation is marked on the
pump body.
dipstick should be check 2-or 3-times to insure that oil
(4) A bleed hole in the oil pump body and the
level is about half way up to the PULL mark.
cover leads from the oil seal cavity to intake side of the
pump to avoid a pressure build-up back of the oil seals.
NOTE
b. Removal (fig. 4-57).
For hulls 8540 thru 8560 and 8580 thru 8618, prior to
(1) Disconnect the tachometer drive cable
replacing the HYDRECO engine driven hydraulic pump,
from the drive.
deactivate existing pressure by removing the acorn nut
(2) Remove the transmission oil strainer.
and turning the adjusting screw clockwise. Replace the
(3) Disconnect the oil pump outlet hose.
acorn nut.
(4) Remove the bolts, nuts, and lockwashers
securing the oil pump to the flywheel housing. Then,
remove the oil pump from the flywheel housing.
4-61
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