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View Full Version : Exhuast and water temp



hyperlite98
07-12-2004, 10:06 AM
My 4.3 carb merc is showing 180 on the water temperature guage at about 4000RPM and above, is this too hot? Also the port exhaust manifold is hotter to the touch than the right??? Is this normal?

thanks,
jeff

GKricheldorf
07-12-2004, 10:22 AM
Jeff,

That seems to be high. My 454 runs about 150 after it's warmed up. Do you know if you have a 140 degree thermostat in it?

Glenn

Pismo
07-12-2004, 02:49 PM
Do you have closed cooling? Does it run cooler at low rpms? If so change the impeller. Is it a stock engine, if so it is a little high.

hyperlite98
07-12-2004, 03:26 PM
Hi,

Its a stock 4.3L (190HP) the temp does go down at lower RPM's but is usually hanging around 180 during cruising speeds. I'm not sure what the thermostat is, I just bought the boat and it only had 4 hours on the engine (1999 sweet 16).

jeff