200 Mercury getting hot

[rod102]

I have a 1991 200 H.P. Mercury 2.4 Litre. It is getting hot at 3,500 rpm's. It was rebuilt about 2 months ago. The divider plate gasket was blown. replaced that and it still is getting hot. It is like the exhaust is getting into the water jacket. There is a lot of water pressure at idle on the gauge 35psi. This motor had a sleeve put in on #3 cylinder also. Any help will be appreciated.<br />thanks<br />Rodney

 

[Kenny Bush]

Re: 200 Mercury getting hot

Is this recently been happening or has it always got hot at higher RPM's? Also, I have never seen water pressure that high. Is your guage accurate? 10 lbs at idle is common, with it going up as high as 20 lbs at higher RPM's.

 

[gss036]

Re: 200 Mercury getting hot

Take a look at the poppet valve, could be stuck and not dumping excess water through the exhaust.

 

[rod102]

Re: 200 Mercury getting hot

This problem has just started happening. The hot horn is sounding. The poppet valve appears to be okay.<br />thanks<br />Rodney

 

[rod102]

Re: 200 Mercury getting hot

I have taken the poppet valve out and it keeps the hot horn from sounding. Any ideas?<br />thanks

 

[rod102]

Re: 200 Mercury getting hot

This motor is a 2.5 litre instead of a 2.4 litre.<br />thanks

 

[TampaTom]

Re: 200 Mercury getting hot

I have a 1997 200 (2.5L) and have had this problem (in fact having it again now.) It was the poppet valve. I took the poppet apart and cleaned everything and still had the problem. After going through everthing (impellor, thermostates, engine height) I went back and replaced the poppet valve. That did it. It happing again probably because I run in salt water and don't always flush.

 

[KCLOST]

Re: 200 Mercury getting hot

Replace the entire poppet assembly... Everything....<br />Poppet, carrier, grommet, spring, diaphram, washer, gaskets... And clean the metal parts and hole as well as you can before reassembly...

 

[rod102]

Re: 200 Mercury getting hot

Thanks for the help.<br />Rodney