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How to manually crank engine

Started by sbetts, 13 April 2024, 05:16 PM

sbetts

Hello,

I have a 1974 450SEL than has not been driven in over 20 years. I want to see if the engine will move, but have never cranked an engine with a wrench. How do I? It looks like there is a plastic white cover over the crankshaft end, but before I pry it away I figured I'd check with you all to make sure that is the correct place to do this, and to hear other suggestions. What size socket would I need?

daantjie

For starters you need to remove all the plugs so you're not fighting compression.  You need a long wrench as well.  Turn clockwise facing the engine.  There is a large nut on the crank pulley for which you need correct socket and extensions as the nut sits pretty deep.
Daniel
1977 450 SEL 6.9 - Astralsilber

Pete49

I would add some light weight oil via the plug holes and let it sit for a while before trying to crank it. You would need to do a fluids before starting anyhow.
What this country needs are more unemployed politicians.
Edward Langley,  Artist (1928-1995)

Pete49

What this country needs are more unemployed politicians.
Edward Langley,  Artist (1928-1995)

Max-NL

You will need a 27mm socket. I would recommend a deep socket and a short extension.
1971 R107 350 SL
1972 W108 280 SEL 3.5
1975 W116 280 S
1975 W116 450 SEL 6.9 #140
1977 W123 230
1992 W124 230 CE
2001 Ducati Monster S4