Pressure Lube - Briggs & Stratton Twin Cylinder L-Head Repair Manual

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PRESSURE LUBE

Engine Models 400440, 400770, 402440, 402770, 404440, 404770, 422440, 422770 and 462770, are equipped with
a full pressure lubrication system with an oil filter.
A direct drive oil pump supplies lubrication to all bearing journals at 10-50 psi (.0.7-3.4 Bar), Fig. 27, Fig. 29.
The oil pump draws oil through a screened pick up in the engine base and pumps the oil through the oil filter. The
filtered oil flows through oil galleries (passages) in the crankcase cover or sump where it is distributed to the PTO
bearing and cam gear bearing.
An oil gallery in the cam gear connects to the oil gallery on the magneto side of the cylinder, lubricating the magneto
bearing.
Oil galleries in the crankshaft supply oil from the main bearings to the crank pins, lubricating the connecting rods,
Fig. 28, Fig. 30.
Engine oil pressure will vary with oil viscosity, ambient air temperature differences, operating temperatures and engine
load. Follow the oil recommendation in General Information, Section 1, page 5.
Oil filters are available through your Briggs & Stratton source of supply. Order Part #491056.
A shorter oil filter (2-1/2" (6.4 mm)) is available for restricted access applications. Order Part #492932.
Fig. 27 – Full Pressure Lubrication System Fig. 28 – Full Pressure Lubrication System
Horizontal Crankshaft Vertical Crankshaft
CAM
GEAR
DRIVE GEAR
PUMP HOUSING
SHAFT
& ROTOR
OUTER ROTOR
ROTOR
AND SHAFT
"O"-RING
OUTER
ROTOR
PUMP
COVER
Fig. 29 – Oil Pump Horizontal Crankshaft Fig. 30 – Oil Pump Vertical Crankshaft
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