Dave M

I'm pretty sure the 525 manual says that the oil temp should be below 220. The motor has almost 250 hours on it, runs great, oil looks fine.

BTW, I'm getting my numbers from Smartcraft, if that matters.

MILD THUNDER

iTrader: (3)

I was just being a wise azz . But yes , I also belive the smart craft buzzer will sound at 220 on the 525?

ROB FREEMAN

iTrader: (2)

my high temp light comes on when my oil hits 250 witch it did this past weekend running the four hoarsman on lk winnabaggo this past weekend . freaked me the hell out . was on 25 mile run to first stop at 4 to 5 k average . I was disappointed my Teague coolers didn't keep oil temp down .. 17 pd of water pressure too . just when I was getting to some calmer water to lettr eat .anyway 250 light came on for the record .

abmotorman

Hi Rob, didn't realize that was you loading a couple boats be hide me. (I didn't do the run this year) Have you always had 17 PSI of water pressure? Might a flow restriction be starting. That chain has quite a bit of sand. Your boat sounded good. Andy

BUP

iTrader: (9)

You are correct about merc racing 525 hp listing the MAX allowable oil temp of 220 degrees. They never listed the reason why..

ROB FREEMAN

iTrader: (2)

yes . water t stat . deffinately didn't expect those engines run that hot . im glad my alarms let me know . caught it instantly . it really jumped up quik . . . yikes

bobl

Let me see if I can add to the confusion. Most mercury applications are measuring temps after the cooler as it enters the block. That would explain why they want a relatively low temperature, it's a lot hotter in the pan. A couple of posters mention they were measuring temp before the cooler, hence they get a higher number. If you compare the temp reading on the gauge to that of a gun you quite often see a large difference. Where are you reading with the gun? Pan or filter before the oil is cooled perhaps? Gauge isn't wrong. It's reading cooled oil. Just more food for thought...carry on.

Bob Lloyd
Full Throttle Marine

ROB FREEMAN

iTrader: (2)

ys

ROB FREEMAN

iTrader: (2)

thanks .ill c my strainers . I get 17 to 23 wide open . both gauges seem to be very close though

ROB FREEMAN

iTrader: (2)

just thinking here lookout . on a restriction would water pressure surge or sufer ? id say surge higher but id rather know for sure lol sorry for the triple post