Mercury 175 Black Max overheating.

T

TampaBoater

Petty Officer 1st Class
Joined
Feb 23, 2012
Messages
207
Ok, took the boat out to my mechanic today, he says compression is good, but the right power head is heating up as much as 20 deg more than the left. He thinks is the poppet valve, or thermostat. I noticed that the poppet valve housing is not as I've seen in other motors. The housing seems "imcomplete". You know how the housing have (from an outsideview) a larger circle where the actual valve sits, then another smaller circular piece just to the left of the larger one, ussualy where the water inlet sit. Whell that smaller circular piece is absent. Is this right? Is it suppossed to be like this?
Everything else is fine.
Thanks.
 
Faztbullet

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,620
Re: Mercury 175 Black Max overheating.

He thinks is the poppet valve, or thermostat
Click to expand...
Well the poppet valve holds the water in the block so that aint it as if it was both side would be getting hot. The t-stat would be a good start but if its only a 20? difference thats normal as the right bank runs a tad warmer than the left. You have the first design water water cooling system and it only has a 2 bolt cover over t-stat as the other end is cut off from factory.
 
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