Re: Leaking crankcase leads to overheat condition?

[johnyrude200]

Thanks for the advice Fleetwin. Will be careful with the shift lever removal and reinstall. To your point, the square washer is the one I’ve seen get stuck most times.

Zephyr – the cooling system on this motor is not the issue. I did a full tear down from the skeg to the manual starter, this is low-hour, fresh water motor, and it is the 1st 18-20-25 that I’ve seen run hot at WOT (and not super hot, but the situation predicates I split hairs since human life is in the balance based on motor performance, literally. There is no option for the motor to skip a beat when the moment calls for a 1/2 pull start and WOT 1 second later, without a single hesitation. It’s not what most motors were designed for [primarily father/son fishing trips], but it’s what the local town can afford on their budget so I’ll do what is necessary to make it fit the application).

The service manual calls for J4’s, it had J6’s (which I routinely put into my motors before they leave my hands), but in this instance, sustained WOT with no weird factors is causing it to run at 170° with a new thermostat and cause blisters on NOS J6’s, but not J4’s which are also J4’s (only after 2-3 mins of continuous WOT), impeller, clean impeller housing, no clogs or any evidence in any manner of water occlusions, new impeller grommet, etc.

It’s not a salt motor. This motor was aged, but in exceptional condition before I touched it. It was a 2-motor set up on a corson boat which I saved from the junkyard, and even before I put $400.00 worth of parts into it (retail), would have run reliably and been a workhorse. But when it comes to putting a motor onto an emergency vehicle, I’m going to take it an extra mile. The spark on this 1970 univeral magneto motor jumps 3/4 of an inch.

A tribute to all of the mentors/veteran mechanics of the AOMCI and the forums – as much as I appreciate CDi ignition – a fresh magneto throw spark in a competitive manner to the computer chips.

If I am just plain wrong in any aspect of this post, I have no problem being called out on it. Seriously.