240D Replacement Engine 17 10 2009

Description

A used replacement OM616912 engine fitted to a 1982 W123 240D (same as original engine). A compression test was carried out after fitting the engine to the car with the following results: No.1 300-310psi, No. 2 340psi, No. 3 410psi, No. 4 420+psi. (Valve clearances were adjusted before compression test). Factory specification for cylinder compression is 425psi with max difference between any cylinder of 45psi. Engine is knocking. This knocking appears to stop when fuel line on No. 1 injector is loosened, also suggesting that knocking is from No.1. Lower frequency knocking is audible in cabin, possibly as a result of out of balance forces on the crankshaft (due to the difference in cylinder pressures).

Keywords

240D, OM616, Engine, sound, Mercedes, Diesel

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