Start and run the engine for a short period and
check for oil leaks. After any oil leaks have been
corrected and the engine has been stopped long enough
for oil from the various parts of the engine to drain back
to the crankcase (approximately 20 minutes), add
sufficient oil to raise the oil level to the proper mark on
Remove and Install Bypass Valve
If necessary, remove the filter adaptor from the
Remove the plug and gasket and withdraw the
Fig. 3- Bypass Valve
Wash all of the parts in clean fuel oil and dry
Replace Spin-On Filter
them with compressed air.
Remove the oil filter using strap wrench tool J
Inspect the parts for wear. If necessary, install
24783 which must be used with a 1/2" drive socket
wrench and extension.
Reassemble and install the bypass valve. Use
Discard the used oil filter.
only the current bypass valve and spring for service
(Fig. 3). The current thicker valve and stiffer spring
Clean the filter adaptor with a clean, lint-free
increase the bypass pressure from 13-18 psi to 18-21
psi (90-124 kPa to 124-145 kPa) to permit more efficient
filtration. Tighten the 1 1/4"-16 bypass valve plug to 95-
Lightly coat the oil filter gasket (seal) with clean
105 lb-ft (129-143 N·m) torque.
Start the new filter on the adaptor and tighten by
The current and early design bypass valves are not
hand until the gasket touches the mounting adaptor
head. Tighten an additional two-thirds turn.
Use a new gasket and install the filter adaptor.
Mechanical tightening will distort or crack the filter