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 Lehman 120 engine restriction ?
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Author Previous Topic: Fuel starvation one engine Topic Next Topic: which parts should I use? merc or indmar  

TJM

RO# 2909

Posted - Jul 11 2018 :  12:33:21  Show Profile  Reply with Quote
We have noticed that our port engine surges about 500 RPM after about an hour of driving.
Wicked confused on this one.
Engine synchronizer is engaged and working. RPM gages show the port engine is 700 RPM slower than starboard (nothing new on these old gages). Speed is OK at 8 kts. After the surge the RPM are almost balanced at 1750 RPM and the engines sound smoother and more in synch with each other and speed picks up .50 kts.

Bottom has been cleaned, running gear looks fine.

All of this happens with the engine synchronizer working.
Tom
41' President

Homeport: Essex, Ct

pdecat

RO# 842



Posted - Jul 11 2018 :  20:35:28  Show Profile  Reply with Quote
Try running with the syncs off and narrow the issue to the synchro

Bruce



Homeport: Gulf Coast FL Go to Top of Page
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