When doing a compression test you must properly seal the inner surface of the pre-chamber with the fuel injector hole adapter. Copper washers work the best for this to ensure a 100 percent seal. Do not use the engine's heat shield washers. After a few uses, these will flatten out and must be discarded. As of February 2021, we are shipping our compression testers with four of these sealing rings. It is good to have extras if you plan to do multiple compression tests.
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Related Products:
All 61x and Some 60x Diesel Engine Compression Tester Kit With Test Guide
For use on all*** Mercedes diesels 1959 to 1993. BUT PLEASE NOTE THERE ARE SOME LIMITATIONS ON THE LATER MODELS. Test compression on 110, 115, 116, 123, 126, 201,124 AND 140 chassis. Almost ALL models up through 1987 can be tested through the fuel injector hole.
OM602 and Late OM603 Special Adapter for Compression Tester
This is a hard-to-find adapter that will need if you have one of the early 1990s 5 and 6 cylinder turbo diesel engines. We machine this right here in our shop and it is designed to work directly with our OM61x compression tester ( see related products below):