Sensor O-ring 320/04057 JCB 444, aftermarket

Sensor O-ring 320/04057 is an aftermarket part for the machines with the JCB Dieselmax 444 engine. This ring seals the seat of an engine sensor.

When hunting a leak, check the joint's O-rings first, since many oil leaks come not from expensive parts but from these small rings failing. Whenever a joint is taken apart, renew its ring, as the old one has taken a permanent set and will not seal again.

Specifications

Compatibility

According to the product card, 320/04057 is an engine O-ring. Fit is confirmed by the part number. The catalogue also has the genuine version of this part. Other parts are in Seals and oil seals.

Fitting

On assembly, clean the groove and mating face, wet the ring with the working fluid or suitable grease and seat it without twisting. Protect the ring as it passes sharp edges and threads, tighten the joint to the specified torque and check for leaks under pressure. Spare rings are stored somewhere cool and dark, since rubber in sunlight cracks at the surface. Before fitting, inspect the ring for cracks and cuts.