Can't cool down my Black Max 150!!!

[szealuss]

Ok same as everybody, 1986 merc 150 runs hot on a load. Just got this motor so change water pump completely, and new poppit kit. Starboard side was hot, so the temp guns says. replaced head gasket and cover gasket, also. No difference.
ANY IDDEAS?
Took the head down had it shaved .015 to correct it, new gasket, same problem. put another gasket thought jugs were out, same problem. Compression is an even 120 psi accross the board, BTW.

Put a water pressure gauge on and at idle 10 psi, (have not been able to go out to see at wot where it stands.) Tguns says the cylinder head cover is hot throwing the alarm, not the rest. so i did run until other side wentover 200 on gauge . I am convinced I have an exhaust gasket or plate issue.

I also took off exhaust cover to inspect the water jackets (all good). Also has good t-stats, as well. I even inspected the water tube on both ends and sealed the divider between exhaust and pump

Is there a procedure I can do to test my theory, or Do I just have to dig in!!
And are these old mercs worth the hassle? It does get up and go, just can't go anywhere

 

[szealuss]

Re: Can't cool down my Black Max 150!!!

Even though there is no replies to this forum, I have fixed this 150it runs almost ice cold. I have took it down to the exhaust plates and changed the gaskets. But the problem was a pinhole in the casting at the impellor on starboard side was siliconed shut and the impellor base plate had the wrong gasket underneath it. I fixed that and the exhaust plate gaskets, but i could not find anything wrong with any gasket i changed. Put it back together and Shazamm! In the wind I went. GOOG LUCK with your150. Ohh and i put a water pressure gauge(must have).