Volvo D3 diesel engine "start" question

[BartW]

a question for the (Volvo) diesel engineers,

some here might know that the basic motor block on one of my two D3-190's has been replaced under warranty, all ad-on parts are still original.

after 9hours testing the almosty "new" engine works good,
- temperature on both engines is +/- 1°C the same
- acceleration is the same
- Turbo pressure is the same
- max RPM is the same
and even the trottle position is level

so I am happy with the repair, apart from one concern;

- The old engine alway's starts with one good cycle of the engine
- The new engine alway's starts but only after 3 or 4 cycles of the engine,

What could be the cause of this, I have been thinking / adviced about two possible causes:

1) the electric starter engine on the new engine, has been heavyly stressed just before the engine block was replaced many start attemps,
so the starter engine might be damaged and has lost some power ???

2) perhaps the camshaft sensor to detect the cycle and position of the pistons is not well connected after this major repair.

any advice for a test is welcome,

I have not yet contacted Volvo service for this, but I think I should do this, as it is part of this job/repair

thank you for your comments

 

[AntonW]

Lazy Start

Try hand priming the engine before trying to start the engine by using the hand pump on the fuel filter pump until it is stiff. If the engine starts more readily then air is getting in somewhere.

Could be in fuel supply anywhere.

Anton

 

[BartW]

Try hand priming the engine before trying to start the engine by using the hand pump on the fuel filter pump until it is stiff. If the engine starts more readily then air is getting in somewhere.

Could be in fuel supply anywhere.

Anton

Thank you Anton for the advice,
I've got similar advice (air in the fuel system) by PM
but your sugested test is very simple to try out,
will try this asap when I'm at the boat,

we have involved the VP dealer also, and are waiting their advice