This is a new O-ring seal in Viton material for the TDI injection pump's cast iron "head". The O-ring goes between the aluminum pump body and the cast iron head and be advised that replacement requires moderate technical skill and very clean working conditions. Viton is generally regarded as superior to the Buna O-ring as supplied by Bosch. The kit also comes with the 6mm x 55mm Allen stop screw and eight plastic dust caps are also provided to seal off the four injectors and four output valves on the injector pump during this procedure. The 55mm stop screw is used to keep the pump head from coming out too far during the seal swap.

Click here for the replacement procedure.

If you already have or do not need an Allen stop screw and would like to order multiple o-rings you may use the dropdown menu below to do so. If you order more than one unit of selection "A", we will only send one 55mm Allen stop screw and one set of eight red plastic dust caps along with your o-rings.

Pick USPS Priority Mail during checkout for cheap and fast shipping!