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Old 12-20-2018, 10:31 PM   #1
Steve91T's Avatar
City: Huntersville NC
Vessel Name: Abeona
Vessel Model: Marine Trader 47 Sundeck
Join Date: Sep 2016
Posts: 896
Lehman 225 high idle only even warm?

Hello all. My new to me boat has an odd issue. The idles when cold are 500-600. The starboard ending actually shakes at cold idle, as if the idle is too low. I usually bump the throttle up just a hair when cold to calm it down. I usually let them idle for a 5 minutes or so before leaving the slip or anchorage. They never try to quit when going in and out of gear.

But once up to operating temp, both idles are right at 1000 in neutral, but drop to 700 ish in gear, but they clunk more than Id like going in and out of gear.

Im thinking of lowering the idle when hot and just dealing with a low cold idle.

Anyway, just wondering if this is normal to have such a difference between hot and cold idle.


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Old 12-20-2018, 11:06 PM   #2
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City: Au Gres, MI
Vessel Name: Never Say Never
Vessel Model: President 41 DC
Join Date: Jul 2015
Posts: 11,747
I am not a mechanic so I am not sure exactly how it works, but my SP225s have a cold high idle switch on them. Before I start them when they are cold I push the throttles full open. There is a push button switch that sets the high idle. I push the button, pull the throttles back to idle and start the engines. They idle at a higher RPM until they warm up. Works great. Not sure how to install such a system but you might try Brian at American Diesel.

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Old 12-20-2018, 11:09 PM   #3
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City: Gibsons, B.C., Canada
Vessel Name: Island Pride
Vessel Model: Palmer 32'
Join Date: Oct 2007
Posts: 3,455
I'll second contacting American Diesel. Likely there is an adjustment for both the cold and the hot idle.
They should be able to tell you Just what is the procedure.
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