5.0 Mercruiser average running temperature and Oil Pressure?

[madurodave]

Still trying to get used to the new to me boat. What is your average running temp and Oil Pressure? Mine sat at 175-180 degrees all weekend, Oil around 40psi. What does yours run?

 

[Bondo]

Re: 5.0 Mercruiser average running temperature and Oil Pressure?

Ayuh,... Your water temp is High,.... Should be 160? or 140?, depending on which T-Stat you've got...
Changed the Impeller lately,..??

Acceptable Oil Pressure for a SBC is 10lbs. per 1000rpms....

 

[dvan1901]

Re: 5.0 Mercruiser average running temperature and Oil Pressure?

I've got a 2007 5.0 MPI (Mercruiser) and my temp is about 150'ish and my oil will be about 40 at idle and 60 when running.

 

[madurodave]

Re: 5.0 Mercruiser average running temperature and Oil Pressure?

ruh roh! Glad I asked. Need to check the impeller!

Oil pressure seems to be ok based on "10lbs. per 1000rpms"

 

[cpubud]

Re: 5.0 Mercruiser average running temperature and Oil Pressure?

my 2000 5.0 160 t stat runs at 165 to 170 , oil psi is 40 at idle and 45 to 50 psi running. new impeller at start of season.

 

[gadget73]

Re: 5.0 Mercruiser average running temperature and Oil Pressure?

One runs 145, the other runs 160. Oil pressure in the 40-50 range. Every needle on the starboard engine is one needle width higher than the port motor, so they both probably run the same temp but I can't actually swear to it. Same thermostat on both motors, both impellers replaced at the same time (this year).