Re: "Newer" 25/35hp OMC compatibilities

[collectorinspector]

Quote "So I ended up fabricating a new plate from 1/16th aluminum (same thickness as the original baffle)."

My last two cents worth.

Personally I suggest that you do not go down this path…..not even contemplate Aluminium unless you know what are the mechanical properties and exactly what type of aluminium.

With aluminium it is not the temperature that is the problem adjacent to the exhaust ports.

The fault you will find is a seven letter word beginning with the letter "E".

Also the last pics (1978) show no evidence of overheating as the Johnson white paint on the block and head is not even burnt yet. Yes, they can burn paint and still be a runner later with luck. I am so confused now as this post is being edited and chops and changes. No engine plate details yet and no confirmation as to what the serial is on the block medallion.

You have put it back together with Glue? You have to fix the broken threads……..any good machine shop easy!

Also pics of the power head?

Have you actually had the head water jacket plate removed and cleaned all of the in and out passages and is the spring on the thermostat free to relieve pumping pressure? Information seems to be in dribs and drabs so far…… so how can we help with a guess.

SO Sadly

I will just follow this post with no further comment from now on.

B