I just brought home my very first Mercedes. It is a 1974 240D. It seems a bit hard to start sometimes. What is the best way to test the glow plugs?

Thanks

What is the engine model number? I may have a diagnostic procedure for testing the GPs. If I do, I can scan the pages and e-mail them if you want.

ATK_MAN

Try posting in the Diesel Discussion area. There are many there that have your same car. As far as your problem here is a list of suggestions.

1) New glow plugs
2) Valve adjustment
3) New Fuel filters
4) Diesel purge
5) Check alternator output at battery with engine running, shoud be 13.5-14.2 V. If not tighten belt.

Also if you live in a colder climate a block heater helps in the mornings.