Oil pump relief valve 02/202447 Perkins 1004, genuine

Oil pump relief valve 02/202447 is a genuine JCB part for the Perkins 1004 series engines. The card also lists 4138A054, 4138A056, 997-123.

The relief valve limits oil pressure at the outlet of the engine oil pump: when pressure exceeds its setting, it opens and returns the excess oil to the pump inlet or the sump. This protects the filter, seals and oil cooler from over-pressure on cold, thick oil. A valve stuck open gives low oil pressure and a lit oil lamp, and one stuck shut gives excessive pressure on cold starts. The valve is used on Perkins 1004 series engines; the Perkins number is 4138A054. The valve is mounted on or near the oil pump and, together with the pump, sets the pressure in the engine lubrication system. When the sender shows low pressure, confirm it first with a mechanical gauge, then remove the valve and check the plunger moves freely and the spring is not broken. The valve is supplied new.

Specifications

Compatibility

The catalogue also has the aftermarket version of this part. Other parts are in Hydraulic valves.

Fitting

Clean the mating face before fitting and check that the moving part inside the valve is free. On first start, confirm the oil lamp goes out within a few seconds.