BenzWorld Junior Member
Date registered: Jan 2012
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78 300D low compression
I bought a 78 300D with 274K miles about 3 months ago. Now it will not start. After replacing the glow plugs, injectors, adjusting the valves and checking the fuel system, I have narrowed it down to low compression. My compression is below 200 in all cylinders. A shop checked compression a few months ago and said is was very good.
What could cause such a loss in compression in all cylinders? Is it more likely something with the head, or piston rings?
Last time I drove it, it ran fine. The next morning it would not start.