Inspection of Oil Pump during V8 Engine Overhaul for 35, 39 and 42 Models
ENGINE
OVERHAUL
29
Oil pressure relief valve - remove
1. Remove circlip.
2. Remove relief valve plug.
3. Remove and discard ’O’ ring from plug.
4. Remove relief valve spring and piston.
5. Check piston and bore of relief valve in oil
pump body for scoring and corrosion.
NOTE: Light corrosion may be removed
using grade 600 emery cloth soaked in oil.
Oil pump - inspection
1. Thoroughly clean oil pump drive gear, cover
plate, rotors and housing. Remove all traces of
sealant from cover plate securing screws and
bolt - if fitted; ensure tapped holes in timing
cover are clean and dry.
2. Check mating surfaces of cover plate, rotors
and housing for scoring.
3. Assemble rotors and oil pump drive gear in
housing ensuring that reference marks are
aligned.
4. Using feeler gauges, check clearance between
teeth of inner and outer rotors:
Maximum clearance = 0.25 mm (0.01 in)
5. Remove oil pump drive gear, check depth of
any wear steps on gear teeth:
Wear step maximum depth = 0.15 mm (0.006
in)