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Diesel This is a forum dedicated to diesel engines and their applicable accessories.

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  • 1 Post By chucklesR
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Old 07-23-2013
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Yanmar injector pump fail?

I have a 2010 Bene 43 with a 4 cylinder, normally aspirated diesel with less than 120 hours. A couple of months ago, I was coming back from Annapolis to Balto, and began to have lots of white smoke at 2500 RPM, slightly less at lower RPM.

In dock, I checked the engine, and several of the coolant water lines were loose at their attachment points with loose hose clamps. I tightened every hose clamp on the engine (!) and the problem seemed to be solved.

Two weeks ago, returning to dock under power I had lots of white smoke again. In dock, I checked the clamps again. All tight. Checked the fuel pump. Pumping strong to the injector pump. It seems, though, that the injector pump is not pumping fuel to the injector rail.

So, do I need to replace the injector pump? Can it be re-built? I bought the boat used, and unfortunately it is out of warranty....

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Old 07-23-2013
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Re: Yanmar injector pump fail?

Have you had to add coolant? If so, it appears it is finding its way into the cylinder, bad head gasket? Does it heat up? If it is running, the injector pump is probably OK? Other possibilities: Partially plugged filter(s), tank pickup partially blocked, tank not venting?

IIRC, white smoke can be coolant, assuming you have a heat exchanger.

Any recent work done on the engine?

Paul T
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Old 07-23-2013
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Re: Yanmar injector pump fail?

Originally Posted by eisselhardt View Post
It seems, though, that the injector pump is not pumping fuel to the injector rail.
How do you know this?

If the injector pump is not pumping fuel to the injector rail your engine wouldn't start and run at all.

Do you have a temp gauge? How hot is the engine running? (If you don't have a temp gauge an inexpensive IR electronic temp instrument is worth the investment.)
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Old 07-23-2013
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Re: Yanmar injector pump fail?

The only way it can be the injector pump / rail is if it's been adjusted and now the timing is off. Your problem is not (can not be) that it's not pumping, but may be that it's pumping incorrectly.

White smoke is raw diesel coming through combustion unburned.
It's causes are:
bad injectors - could be one is clogged (simple to test at home).
bad timing - # 1 thing to look at, unfortunately you can't do it.
Low cylinder pressure
Cracked head / bad gaskets- water leaking in (i.e. it's steam not smoke)

Since you have a 3 year old engine which previously had a cooling water issue of loose clamps if it's not the timing issue I suggest that would be the issue. It's obvious someone has 'worked' on the engine.
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