| Type | High-pressure system. Wet sump. |
|---|---|
| Oil Pump | Gear type. |
| Minimum pump radial clearance | .0015 in (0.038 mm) |
| Maximum pump radial clearance | .0035 in (0.089mm) |
| Oil Pressure | 35 to 55psi. (250 to 400 kPa) |
| Relief Valve spring free length | 4-27/64 to 4-29/64in. (112 to 113.1 mm) |
| Relief Valve spring load at 2-37/64in. (65.48mm) | 17 to 18lb (7.7 to 8.16kg) |
| Relief Valve spring rate | 9.5lbs/in. (1.72kg/cm) |
| Oil Pressure Warning | 9 psi. (62 kPa) |
| Oil Filter | |
| Engine Nos. 2001 to 35156 | AC type FK.1. Renewable element, by-pass |
| From Engine No. 35157 | AC 720. Renewable element, full-flow |
| Bypass valve spring load at 1-7/32 in. (30.96mm) | 2-1/4 to 2-1/2 lbs (1.02 to 1.34kg) |
| Oil Strainer | Wire gauze on pump intake |
| Pressure Relief Valve | Non-adjustable |
Oil pump drive gear changes tooth profile & size at Engine No. RL.35157 to match the modified drive gear on the camshaft introduced at the same time. This gear can be identified by measuring the outside diameter: 1.362 to 1.366 in. (34.59 to 34.96mm).
At Engine No. RL.45095, a new oil pump drive gear with offset distributor drive dogs was introduced. This prevents reassembly with the distributor 180° out. This is part No. 6332508, and should be matched with distributor drive sleeve part No. 7952552 with a correspondingly offset slot.
Upon reassembly with the new drive dogs, the steel ball in the flywheel should be aligned with the centre of the timing aperture notch, with No. 1 piston on compression stroke.
Install the oil pump so that the distributor drive dogs are at 90° to the axis of the camshaft, or within 14° clockwise of this position, with the dogs offset to the rear of the engine.