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496 Engine Temp

Old 05-09-2004, 05:44 AM
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Default 496 Engine Temp

My '02 275 with 496 HO has been running on plane and idling at 180 degrees. I can't remember how hot it was running last year. Does the 496 have 160 degree thermostat? Is 180 a potential problem? What temps are others 496's running? Also, I've heard that 496's have a brass impeller, is that true?
Any input would be greatly appreciated.
 
Old 05-09-2004, 06:52 AM
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My Merc. 496 service manual list the thermostat at 160.

I believe the motor goes into safe mode at about 190 degrees.

Have you changed the impeller for the raw water pump (neoprene?)?
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Old 05-09-2004, 07:14 AM
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Mine runs about 165-170. It only gets to maybe 180 after a hard WOT run, but cools back down quickly.
Time to check impeller.
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Old 05-11-2004, 03:35 AM
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Thanks for your input guys. I'm going to attempt to pull the seawater pump and replace the impeller. Do I need to lubricate the new impeller? Anything else I shouold know?
 
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