B250 3/4 Ton Van V8-318 5.2L VIN T FI (1992)
REMOVAL of oil pump for servicing requires oil pan to be removed and oil pump unbolted from rear main bearing cap. With pump removed,
disassemble pressure relief valve by pulling out cotter pins and drilling a 1/8 inch hole into center of relief valve retainer cap. Insert a self-threading sheet
metal screw into cap and secure head in vise. While supporting pump body, remove cap by tapping body with soft hammer. Discard retainer cap and
remove spring and relief valve. On V8 engines, relief valve spring has a free length of 2-1/32 to 2-3/64 inch and should test between 16.2 and 17.2 lbs.
when compressed to 1-11/32 inch. On V6 engines, relief valve spring has a free length of 1.95 inches and should test between 19.5 and 20.5 lbs. when
compressed to 1-11/32 inch. Replace spring that fails to meet specifications. Unbolt oil pump cover and discard oil seal ring. Inner rotor and shaft can
now be removed as well as outer rotor. Clean all parts thoroughly and inspect for damage or wear. If mating surface of oil pump cover is scratched or
grooved, replace pump assembly. Lay a straightedge across pump cover surface. If a .0015 inch feeler gauge can be inserted between cover and
straightedge, replace pump assembly. If outer rotor thickness measures .825 inch or less on 238 and 318 engines, or less than .943 inch on 360 engine, or
the diameter is 2.69 inches or less, replace the outer rotor. If inner rotor measures .825 inch or less on 238 and 318 engines or less than .943 on 360
engine, replace inner rotor and shaft assembly. With outer rotor inserted into pump body, press rotor to one side with fingers. If clearance between rotor
and pump body is .014 inch or more, replace oil pump assembly. With inner rotor inserted into pump body, place a straightedge across face between bolt
holes. If a feeler gauge of .004 inch can be inserted between rotors and straightedge, replace oil pump assembly. Shaft and both rotors should be replaced
if tip clearance between inner and outer rotor exceeds .008 inch on V6 engines and .010 inch on V8 engines. Using new parts as required, assemble
pump. Prime pump before installation by filling rotor cavity with engine oil.
