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Old 27-10-2013, 17:53   #1
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Ford Lehman 80hp injection pump.

Hey guys. My mate has a 4cyl 80hp ford lehman that he installed in his boat to replace the dead one. The prob is the one he used was from a trawlers AC alternator so it appears the injection pump has been derated for this purpose. The engine sounds and starts well and all, but it will not rev over 1000rpm in forward.

Does anyone has a solution for this? Does anyone have or know where we can get another injection pump? The one from the original engine was left to corrode with the injector lines disconnected.

Thanks.
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Old 27-10-2013, 19:17   #2
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Old 27-10-2013, 19:48   #3
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Re: Ford Lehman 80hp injection pump.

G'day,

Generator motors are fitted with a constant speed class b govenor. He will have to take the fuel pump to an injection workshop to be altered for variable speed operation. Just out of curiosity, what revs does the engine do when reved flat out in neutral??
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Old 27-10-2013, 19:52   #4
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Re: Ford Lehman 80hp injection pump.

The throttle does work. When in N we can rev it up and down. However I do not know the exact RPM as the tacho is not working. When it N it revs much higher than when in gear. I guess maybe around 2500-3000 in N but in gear it wont go much past 1000.

Looks like these guys should have a clue. No contact details?

http://www.americandieselcorp.com/
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Old 28-10-2013, 04:24   #5
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Re: Ford Lehman 80hp injection pump.

More info needed;
Was old engine a 80hp 2712e?
Has the new engine been fitted to the original gearbox?
Has the prop remained the same?
Is the new engine fitted with a Simms or Cav fuel pump.

Close coupled Aussie ford powered gensets need to be run at 1500rpm to produce 50 cycles ,without a tacho maybe your 1000rpm could be 1500. Check the FP tag class A or class 1= variable speed gov, class B or 2 = set speed gov.
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Old 28-10-2013, 15:49   #6
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Re: Ford Lehman 80hp injection pump.

G'day Shakey,

The old engine was indeed a Dorset 2712E. I believe it was running a P5128 Cav Minimec, but I would have to double check when I'm next in Iluka/Yamba as that's where the defunct engine lay.

I used the flywheel off the old engine; as the new one had a massively weighted flywheel presumably to stabilize input power to the alternator. I bolted up the old velvet drive, prop-shaft and prop all original and matched to the old 2712E.

The plate on top of the new motor states Max 1550RPM, and fuel sys: AB.
The Cav Minimec currently used is a P5127 /3.

I found a little info as to spec differences here at boatdiesel.com:

http://boatdiesel.com/Forums/index.c...hread_ID=49552

But could not view the rest of the thread as I need to be a paying member.

I did have a working cable driven tacho before the cable snapped; this is where I got my max reading of 1000RPM when in Forward gear. I have wound out the max RPM screw, and can achieve over 2500RPM in Neutral. When in gear, the throttle moves a 1/4 through its range of motion with a corresponding change in revs, the other 3/4 does nothing at all (except when in Neutral).

I emailed Bob Smith, he says I should take the pump to a diesel specialist and have it built to spec. Others though have suggested that it is not so simple. I also have a spare P5537 /A Minimec. Though it has been sitting around for a long time, and I'm not sure if it works.

Thanks for any and all of your help,

Cheers.
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Old 28-10-2013, 21:21   #7
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Re: Ford Lehman 80hp injection pump.

Take both to a diesel shop for evaluation it would appear that the fitted pump is indeed a constant speed unit.

Cheers.
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