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Old     (kitewake)      Join Date: Jul 2007       07-11-2010, 9:26 PM Reply   
My Sanger V210 has 520 hours on its Black Scorpion Mercruiser. This weekend I noticed a problem with the oil pressure. At riding speed (20-23 mph / 2800-2950 RPM), the oil pressure is low, and bounces around a lot. It varies from normal...down to the low/warning level in a random manner.

The oil level is fine. When I first noticed, I checked the was at the low end of the OK range. It took less than 1/2 Qt to top it that was not it. The oil looks clean (about 75 hours on this I will change soon.) The engine is running at normal temperature, and other wise seems fine.

When I speed the boat up to 25-30 mph (3100-3250 RPM), the oil pressure is rock solid normal.

If it were the gauge, it would be jacked up all the time. Any ideas what this could be...?

Thanks in advance,
Old     (wake_upppp)      Join Date: Nov 2003       07-11-2010, 11:03 PM Reply   
I would suspect an eratic guage, sender, wiring or guage control module before suspecting the engine myself. There should be a way to hook up a manual guage and at least scratch the engine off the list of possibilities.
Old     (kitewake)      Join Date: Jul 2007       07-12-2010, 12:37 AM Reply   

I was planning on doing that...but I don't really think it is the gauge. At 20-23 the oil pressure is all over the place...and at 25 mph + it is rock solid. If it were a gauge, wouldn't it always be erratic?

I have heard that the oil pump shaft can go bad, and the issues will first be apparent at lower RPMs....

That would I will have to pull the motor to change it.....
Old     (dave27)      Join Date: May 2005       07-12-2010, 8:03 AM Reply   
I had the same issue with my Mustang Cobra. I change the oil pressure sender on the block, 12 bucks at auto zone, and it fixed the problem. The gauge either works or not. My money is on the sender in the block.
Old     (wake_upppp)      Join Date: Nov 2003       07-12-2010, 5:57 PM Reply   
If it was a mechanical guage I would say yes it would be eratic all the time but since the signal is converted through the dash module before it reaches the guage, it's harder to diagnose.
Old     (dave27)      Join Date: May 2005       07-13-2010, 7:22 AM Reply   
My gauge that was all over the place was the electric kind. A sender in the block and a guage in the dash. Change the 12 dollar sender in the block. That is the cheapest and easiest compontant.
Old     (sdub)      Join Date: Jan 2003       07-13-2010, 2:15 PM Reply   
I am with Dave. I had a similar prob. with mine, at low rpm the dash alarm would sound and the display would say ' low oil p ". I replaced the sending unit and the problem went away.
Old     (kitewake)      Join Date: Jul 2007       07-18-2010, 6:54 PM Reply   
Thanks were close. It was a loose wire. The boot that attached the lead to the sender unit was super loose. Crimped it a the gunge reads fine. Problem solved.
Old     (dave27)      Join Date: May 2005       07-20-2010, 1:11 PM Reply   
Sweet. It's nice when its simple.


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