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Old 07-18-2019, 11:33 AM   #1
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Raising my idle on a Lehman 120

Hello All:
One of my engines has an idle that is around 500 RPM which causes my engine to stall sometimes, mostly when docking.
I have tried AD and they have responded quickly but with pictures of a Minimec injector pump that I do not have.
My pump is a Minimec CAV but I do not have "adjusting" screws on either side of the pump. The pictures they sent have a vertical bar with two horizontal adjusting screws with locknuts to restrict the arm movement that controls the fuel from the throttles.

How do I raise my RPM ?
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Old 07-18-2019, 11:48 AM   #2
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Post some pics of your injection pump.
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Old 07-18-2019, 11:48 AM   #3
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Either at the engine or control by adjusting the nuts on the throttle cable.

If you have the Morse dual lever control, there are adjustment screws under the plate on top where the idle can be sped up or down. If the adjustment screws are not long enough to get the speed up, replace with a longer screw.
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Old 07-18-2019, 12:21 PM   #4
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What is the recommended idle speed in neutral? Is it + or - 650 ?
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Old 07-18-2019, 01:14 PM   #5
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To reduce vibration, an idle speed between 650 and 800 was recommended by AD.

I have mine at 700.
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Old 07-18-2019, 01:51 PM   #6
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My manual says 600-700.
Mine is around 575.
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Old 07-18-2019, 01:57 PM   #7
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This reminds me I need to adjust my port engine idle speed.
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Old 07-18-2019, 03:08 PM   #8
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Just above where the doors and drawers rattle open.
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Old 07-18-2019, 03:38 PM   #9
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That’s the correct answer, also add not so high that you hammer the damper plate when you shift.
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