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Lombardini not starting

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Good Morning,

Is there a decompression lever on a Lombardini LDW 602? Engine was running well and then refused to start. Fuel, solenoid, filters, glow plugs all checked/replaced. Compression 80psi on cylinder 1 and 190 on cylinder 2, odd that piston rings or valves should fail suddenly so wondered if there is a decompression lever that is stuck.

Any advice much appreciated!

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A teaspoon of hydraulic oil in the bore will raise the compression for a retest if the rings are bad, no help to the valves so can be a good diagnostic tool. 

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