Prior to 1979 all V8 engine oil pumps were fitted with an aluminium bronze driven gear (UE5832) on top of the oil pump which meshed with a steel drive gear (UE5767) on the crankshaft. From 1979 (VIN 39627 approx) the pump was replaced with one (RH14136) with a steel drive gear (UE42783) on top of the pump which meshed with an aluminium bronze gear (UE41034) on the crankshaft.
Bentley have superceded the gears so they now only supply the steel drive gear UE42783. It is absolutely crucial that if you are replacing an oil pump or just the driven gear that you have one bronze gear and one steel gear on the oil pump and crankshaft. Failure to do so will lead to the two gears destroying each other and a subsequent rapid loss of oil pressure.If you are unsure please speak to a member of our sales team. Please also note that a few cars between VIN 39529 and 39627 were fitted with the later style pump.
We also recommend that you check the part number stamped into the cover plate of your oil pump (located on the base of the pump). Although all the pumps are interchangeable according to Bentley and supercede to UE39346, you need to be aware that the O ring that sits on the end of the feed pipe (UE5833) is different depending on which pump body you are fitting the pipe into. There may also be difficulties in fitting an early pump body to a later car.
S2 models (1959 - 1962) were originally fitted with a cover plate number of UE5822 . S3 models (1962 - 1965) and SY models prior to VIN 8742 were originally fitted with cover plate number UE9832CC. These pumps are supplied as UE36683SXR and accept O ring UA11326R.
From VIN 8742 to 39627 (approx) pumps had a cover plate of UE35255.This pump is supplied as UE39346SXR and accepts O ring SPC1468.