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Interior shot of the oil pump without the gears. Slight scouring
of the walls is due to debris in the oil - fortunately the gears still fit
within tolerance for radial clearance, end float and backlash. Note
the two large diameter bushes which take the opposing end thrust of the
two gears. The lid is fitted to the body without a gasket but a paper
gasket is used between the pump and the sump pan. |
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An outside view. The nut locates the spindle for the idler gear.
The upper central hole is the oil inlet; the other, raised, bushed hole
is for the driven gear shaft. |
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The oil pump gears are spline-driven by a hollow shaft from the bottom
of the 'A' side distributor. The driven gear spindle is also hollow
but blanked at both ends; oil being forced onto both gear spindles via the
drillings visible between the gear flukes. |
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A clean camshaft. When dismantled the cam lobes appeared to have
about 0.002" lipping on the front edges. Having cleaned away
the dirt this lip has now, thankfully, disappeared. The centre cam
bush had not been driven home correctly, when last re-assembled, which had
allowed the front gear to pull the shaft towards the front of the engine
by about 0.1" - the followers were not then running centrally on the
lobes. |
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Further evidence of this misalignment is shown by the off-centre polishing
of the gear teeth on both the camshaft and the cross-shaft. |