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Author Topic:   Oceanrunner 225 Running Temp
orca25 posted 06-17-2004 09:05 AM ET (US)   Profile for orca25   Send Email to orca25  
Just bought a 86 Outrage 25 with a 98 Oceanrunner 225 mounted on an Armstrong bracket. Had a motor check done before I bought it at Nauset Marine and everything looked fine. Ran it for the first time and noticed engine temps around 170 at speed. Dropped down to around 150 at idle. Is that normal? Also have a stumble which I think is just carb buildup. Motor will turn 5500rpms. Not thrilled with the boat speed, but more on that in another post.Plan on getting a repair manual ASAP anyway. Plenty of water coming out of pump outlet, but little out of the exhaust of the engine. No steam either. I am assuming that the impeller could be shot. No alarms went off. Boat spent its previous time on Cape Cod in saltwater, now on the CT River with warmer freshwater temps.
Peter posted 06-17-2004 11:02 AM ET (US)     Profile for Peter  Send Email to Peter     
Sounds like its fine but if you want reassurance you should have the water pump and thermostats replaced.
Bigshot posted 06-17-2004 11:03 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Ditto...my thermos broke and helped cause a piston failure.
orca25 posted 06-17-2004 12:37 PM ET (US)     Profile for orca25  Send Email to orca25     
I plan on going through the motor when I haul it out after this weekend. Just bought it so I had to run it for awhile to see what it needs. Definitely, for peace of mind, I will do the impeller and t'stat. Don't want a meltdown. Don't know when the last tuneup was done so new plugs, fuel filter and gearcase oil too. I'm going to de-carb as well and hopefully the slight stumble at low speed will clear up. Thanks for the info.
where2 posted 06-17-2004 12:48 PM ET (US)     Profile for where2  Send Email to where2     
If 170°F is the reading off a Teleflex gauge, then I wouldn't be surprised. Especially if there is a 1/4" gap between 150°F and 170°F.

That being said, the typical operating temps of an OMC in the manuals I have between model years 1967 and 1994 describe an OMC's "normal" temp range between 125°F and staying under 163°F. One should make specific note that they check this at the TOP of the head (top being UP and furthest from the lower unit, not meaning the part where the spark plug screws in). If a V4 or V6, they check the temps on both heads to be sure neither is running above 163°F.

OMC tests engines up through 1994 (maybe later, but I don't have newer manuals) using a Markal Thermomelt Stick (a wax crayon with a specific melting point). They check with the 125°F stick to see if thermostats are stuck open. They check with the 163°F stick to see if obstructions or poor flow are causing overheating.

It would be interesting to compare the temp gauge temp readings to reality using a kitchen thermometer and some oil in a pan on the stove... If the 98 Oceanrunner has some sort of digital gauge, then maybe the Markal sticks are the way to go. If the gauge is analog and leaves a lot of room for user interpretation, then check the gauge. Remember that corrosion in the wiring harness can alter the gauge readings so be sure to check your resistance to the gauge at the sensor, and at the back of the gauge before you disassemble too much.

Bigshot posted 06-17-2004 03:34 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
My 225 runs about 145 I believe on a laser. Gauges are not accurate and hence why most made for outboards are just a swoop with a red part at the top so you know where it "usually" sits and where it should not be.
Knockerjoe posted 06-24-2004 11:06 AM ET (US)     Profile for Knockerjoe  Send Email to Knockerjoe     
On the teleflex web site it says it's temp gauges are accurate to plus or minus 15%. So chances are the gauge is off a bit or your horn would be blasting.

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