Reply To: 1972 85 hp V4 overheated…..

[amuller]

Thanks.

The first time I did this job I didn’t know what the white plastic sleeves were for, and wasn’t confident the tubes were in place, So I dropped it again to make sure.

Don’t recall if I used an BRP or Sierra impeller. Is that important?

My local waters are “no wake” for a mile or so from the ramp, and the channel in is 2-3 feet depth. So whatever happened didn’t happen at high power. But picking up a bag or similar trash seems really possible.

I’m reluctant to disturb the head bolts. Guess I could see taking out one at a time, cleaning, and retorquing.

On cooling, the manual is interesting. Stat is supposed to open at 145. Block temp measured with thermosticks is supposed to be 100-130. Hot horn sensor is supposed to close at 211 +/- 6. Are all these numbers consistent?

I know some motors can get airlocked which is a good reason for a telltale plumbed to the top of the water jacket. I have one plumbed into an existing 1/8″ tapping that was maybe, at one time, for a water heated choke. It’s maybe 1/3 of the way down from the top.

These motors are complex; obviously I have more to learn. Would like a real temp gauge.