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Old 07-31-2011, 06:02 PM   #13
Andy G
Hospitality Officer
 
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City: Pittwater
Vessel Name: Sarawana
Vessel Model: IG 36 Quad Cabin
Join Date: Sep 2010
Posts: 1,897
RE: 120 Lehman overheating

"I filled the coolant, it took 2 gallons"

That's a lot of water you have lost from a closed loop fresh water cooling system. From my understanding of the Lehman 120, the engine does'nt take more than a couple of gallons or so in total, so you have lost a fair proportion of your fresh water coolant. The question then is where did it go & how did it get out?

I have just had a similar problem on my Lehman losing fresh water coolant, having to top up the sysytem regularly only to find it sitting in the drip tray below the engine. The problem turned out to be a slightly warped manifold and end caps, once they were taken off and machined that fixed the problem. Not as expensive as it sounds. This may not be your problem but it's worth crossing off the list.

Good luck.

PS Regarding the petcock that John P mentioned, we once bled the system and did'nt tighten it up properly and lost most of the coolant , the engine temp rose to 220+ in a very short time.Something tokeep in mind.
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