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Old 11-06-2014, 09:52 AM   #1
City: newport
Country: usa
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lehman injector pump

I'm looking to buy an older grand banks with twin lehman 120 motors
The port engine was just rebuilt and they said the cause of the engine failure was a wrong setting on the injector pump. They said it was set for automotive use not marine use. Does that make sense?
It would seem to me that the engine doesn't know where it is and the pump needs to match the fuel needs of the engine regardless of where it is.
What do you think?

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Old 11-06-2014, 10:33 AM   #2
City: LI or Fla
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Hmmm, not a Lehman expert by no means, but if you over fuel, it will smoke alot, but won't cause a failure, if you under fuel loose performance, but again can't see a failure, timed wrong, I guess if really far out, I don't know doesn't sound all the plausible, maybe also post on boatdiesel dot com

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Old 11-06-2014, 11:07 AM   #3
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Unless they over-fueled the timing so bad it washed the rings and scored the cylinders/pistons. That was often a problem with injected gas motors used in performance applications back in the day, but that was a long time ago.

Maybe it was struggling and they just kept pushing it?
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Old 11-06-2014, 11:24 AM   #4
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Never heard that one before. Talk with the people at American Diesel and see what they say. 804-435-3107
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Old 11-06-2014, 01:14 PM   #5
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Like Capt. Bill, I have never heard that. I have both the Lehman and Ford of England service manuals for the engine and neither one of them makes any mention of different settings for the injection pump.
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Old 11-06-2014, 02:46 PM   #6
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I haven't heard that before either, but over fueling could lead to high EGT and that could cause cylinder wall scuffing and engine failure.
Jay Leonard
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Old 11-06-2014, 05:11 PM   #7
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Have a Lehman question, Call American Diesel. They are an incredible resource and literally invented the marinized version of this engine. They have the knowledge and the parts for the Lehmans.

I have no relationship with American Diesel other than as a satisfied customer.

Good luck,

Marine Trader 36. Completed the Great Loop (single handed). Now cruising the east coast and Bahamas.
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