This is a "must-have" kit when adjusting release "pop" pressures on older diesel mechanical fuel injectors. It is the internal spring "shim" thickness that determines the exact pressure required for the release of fuel at the tip of the injector. This kit will work on all Bosch injectors installed in the OM 615, OM616, OM617, OM601, OM602, and OM603 engines from 1961 to 1995. NOTE: These shims will also fit OM621 injectors from 1958 to 1968.
For Adjusting Diesel Fuel Injector Release Pressures
New in 2019. Designed so you can modify and/or build your own precise shim thicknesses.