www.iFourWinns.com

Hi everyone,

I have a 2005 horizon 230/240 with a 5.7 GXI-F in it. My oil pressure varies a little and I wanted to see if anyone else notices the same thing. If I have my RPMs around 3500-4000 the oil pressure gauge will usually show 40. If the engine is warm and I am idling it will usually be at 20... Sometimes just below. Any thoughts on whether this is normal or not is greatly appreciated!

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2005 Horizon 230 5.7 GXI-F Duoprop

It sounds very normal. As the engine oil warms it gets thinner and oil pressure is less at idle. Most marine engines do not have an oil cooler. The harder and longer you run it the more heat and thinner the oil. It takes a while for the oil to cool.

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Surface Interval: A scuba diving term for that time between dives to relax and prepare for life's next great adventure.

Current boat: '02 FW 268 Vista
Previous boat: '95 FW 190 Horizon

I have the same model and have to say, that seems low to me. It will vary depending on RPM's and engine temperature, but I'd expect it to always be in the 40-60 range. What oil are you using?

It's also possible that your gauge, sender, or the connection between them has an issue.

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Mike
2005 Four Winns 230/240
VP 5.7GXi/DP
1998 F-150 XLT
Boat Pic

Mine is about 60 at speed, 40 at idle except after coming off plane were it drops to 20, but after the oil cools it goes back to 40.
The idle readings are also affected by idle speed; if your idle is set very low it can drop as low as 10-15 psi....

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88 Four Winns 200 Horizon
4.3 OMC Cobra-4bbl
2002 Walker Bay 10/2012 Suzuki 2.5
2008 Walker Bay 8

1998 Jeep Grand Cherokee 4.0/Selectrac
2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II