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Old 07-12-2019, 15:32   #61
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Re: #1 cyl at TDC. Valves closed. Cam pulley 180deg off... HOW?! Lombardini LDW 903

Ok, no worries about seawater (raw water) in the engine's cooling system. Most marine engines including outboards are cooled either directly(raw water) or indirectly by the stuff the boat floats on be it seawater or freshwater as the liquid has much better heat transfer qualities than air. On your system, the liquid coolant is cooled by air via the radiator much like an automobile, although you could convert it to the more efficient marine cooling system it would cost $$$. So, I'm curious about how the hot air from the radiator is vented?
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Old 30-07-2020, 13:55   #62
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Re: #1 cyl at TDC. Valves closed. Cam pulley 180deg off... HOW?! Lombardini LDW 903

I have recently bought a nice little sailing boat with a fitted Lombardini LDW502, run about 600+ hours and had it running for approx. 20 hours over 4 days on the way home. I had trouble cranking the engine on the way back (clicking noise from ignition, no crank), found a loose connection on the startermotor from the ignition - and now it cranks but no combustion (cranks but won't keep going).

I've tried with two different mechanics who knew nothing of it, and I have been told that it's either poor timing or bent valve - but I'm a little sceptic on both accounts.

As I have read from this very informative forum, the TDC is determined by the markings on the crank pulley (2nd picture), aligned with the timing cover (PMS, and three lines) - I also have the indicator of an arrow (triangle) on the engine block right above the crank pulley, I did not understand what this was for? (3rd picture). White markings are chalk markings, not painted.

I missed a picture with the cover on - but if anybody can help I can deliver such.
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Old 30-07-2020, 14:17   #63
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Re: #1 cyl at TDC. Valves closed. Cam pulley 180deg off... HOW?! Lombardini LDW 903

That timing belt looks fine, I doubt that it slipped. Are you sure that you were not hydrolocked?
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Old 30-07-2020, 14:42   #64
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Re: #1 cyl at TDC. Valves closed. Cam pulley 180deg off... HOW?! Lombardini LDW 903

Dirty primary filter?
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