496 Engine Temp
#1
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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.
Any input would be greatly appreciated.
#2
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Join Date: Aug 2003
Location: Fairfax, Va.
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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?)?
I believe the motor goes into safe mode at about 190 degrees.
Have you changed the impeller for the raw water pump (neoprene?)?
#3
OSO Moderator
Charter Member
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.
Time to check impeller.
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BillR
'00 Scarab Sport 302 CC
'02 Cigarette Top Gun TS
'02 PQ 340
'00 PQ 280
'98 Scarab 22
'97 Baja Outlaw 20
'72 Checkmate
'65 Glastron
BillR
'00 Scarab Sport 302 CC
'02 Cigarette Top Gun TS
'02 PQ 340
'00 PQ 280
'98 Scarab 22
'97 Baja Outlaw 20
'72 Checkmate
'65 Glastron