I'm planning on doing a commpression test on an 83 300D possible purchase. I've believe that I've read that this engine is tested easier at the glow plugs. Yes? Does anyone know where I can purchase a glow plug adapter for the 83 300D? Would this adapter work on the 603? Are the glow plugs on these engines the same size? What is the size?

I've got a tester with a 500 PSI gage. I have a 27 MM injector adapter on order to run a check on my 603 engine car. It appears easier to test this car via injectors.

When replacing the injectors after running a compression test on a 603 are there any seals or sealing washers, etc, that should be replaced with new parts to ensure proper install? Thread sealant or anti-seize? Thanks to any and all who might offer their advice and experience.

Billybob, my only experience is the 603 961 engine. I learned the hard way to not leave the metal seals/heat shields in the ports not being tested, while doing the test on another. They get blown out, and one of mine was never seen again. I replaced them all.

The site I bought my tester from, http://www.tooldesk.com, had adapters for $12. Check out the site and email Dave at that site to find out if his adapters will fit your tester. He has good prices and is very helpful. I have no interest other than being a satisfied customer.

Harry
86 300 SDL

I think it will be just as easy or easier to test through the injectors. You will have to remove the fuel lines to have adequate access to the glow plug holes anyway. I expect that the rear glow plug hole may be difficult to access, even with the spider removed.

Good luck,