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ContinuousWave: Whaler Performance
redline threshold-Johnson '83 140 V4
|Author||Topic: redline threshold-Johnson '83 140 V4|
posted 07-23-2004 10:09 AM ET (US)
I'm trying to figure out highest safest RPMs for my Johnson 1983 V-4 140HP
can't seem to find stat. in the manual
my neighbor says around 3500?
what's redline for this engine?
reason asking, was overheat alarm was going off this summer for first time-never did in colder water months(fall/Spring)
posted 07-23-2004 10:35 AM ET (US)
Huh? Your redline is like 5500 on that engine. You have a clog somewhere or water pump is not OK.
posted 07-23-2004 12:11 PM ET (US)
I was thinking redline was around 5000.
posted 07-23-2004 12:47 PM ET (US)
Yes...Is the bottom smooth? Is your prop hub slipping?
posted 07-23-2004 12:59 PM ET (US)
I'll check, could you be specific, Big, as far as prop hub slipping-thanks
would putting "fins"- on solve the problem?
posted 07-23-2004 02:17 PM ET (US)
The overheat alarm would go off on one of 110 omc motors on the 22 outrage. The water pump was pumping fine and the temp. gauges showed ok, but every time I would run hard the alarm would go off . Turned out to be a slight blockage in the water passage way near the overheat alarm sensor. The rest of the engine including the other cylinder bank where the sensor for the temp. gauge is located did not heat up. Took a trip to the shop to find the problem.
Mine were proped to turn 5500 rpm
posted 07-27-2004 09:11 AM ET (US)
me thinks aong with a couple neighbors that problem was cavitation, so I took the easy way out and bought dolefins, instead of checking to see if it was overheat alarm sensors (i already put new thermos in thinking that was the problem, and there were no thermos in there)
sure enough the fins solved the problem, no cavitation, no alarm!
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