525 efi oil pressure loss?
07-16-2006, 04:58 PM
#41
Lakeside Restorations.com
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Re: 525 efi oil pressure loss?
I too prefer a bit cooler running temp myself. Engines fluid viscosities stay where they should easier & the combustion chambers are les likley to have detonation. 
Jamie / Lakeside
Jamie / Lakeside
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We Make Fast Toys Faster, Cool Toys Cooler and Old Toys New!.. Performance, Custom & OEM Parts & much MORE![/CENTER]
07-16-2006, 07:40 PM
#42
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Re: 525 efi oil pressure loss?
Originally Posted by gsmith9898
my manual says do not use straight weight oils. The problem I'm having now is not the oil. I have not changed oil. I have always used mobile one 15-50. My pressure was around 80# and went to 20# and will peak out at 22#. I ran all last year and and run all day and never drop below 50# in july. This is something wrong, not oil thickness.
I dont know what nmanual you are looking at but merc this is out of the mers 525 service manual
07-16-2006, 10:10 PM
#43
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Re: 525 efi oil pressure loss?
Originally Posted by GOODT
I dont know what nmanual you are looking at but merc this is out of the mers 525 service manual
07-17-2006, 07:23 AM
#45
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Re: 525 efi oil pressure loss?
Originally Posted by GOODT
I agree 25 40 is the best but what I posted is from the 525 merc service manual straight from merc
07-17-2006, 07:42 AM
#47
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Re: 525 efi oil pressure loss?
2005 42 Executioner, 525 EFI's, Synthetic oil 40W, Fresh oil/filters (merc racing), 140 hrs TT on all. 3 hrs on oil/filters and impellers.
Many thanks
Many thanks
07-18-2006, 09:38 AM
#48
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Re: 525 efi oil pressure loss?
Originally Posted by gsmith9898
I took the boat out for the first time this year and every thing was fine for about 10 minutes than oil pressure dropped to 21 pounds and the alarms went off. Checked the oil pressure with the smartcraft scanner and it is around 22 pounds at higher rpm and around 20 at idle. Any ideas of what the problem is? Also the oil temp was around 230 with a short 80 mph pass and that seems high for such a cold day and cold lake water.
What I had done was just changed the oil and took the boat to the lake for a weekend with the family. I noticed that my oil temps were kind of high and was concerned about that so I was really watching everything closely. As oil started to fill all of the lines from the coolers and filters I started to see my preassure start to sipke and drop. The water was rough and I can only assume that as the pan oil was filling the voids and the boat rocked the pump itself would hit oil and spike the pressure and then come out of the oil and drop pressure. Got the boat back to the trailer and pulled the filter off and it was about half full at best. I put a bucket under the filter housing and cranked the engine over and it spit out no oil at all. Talk about a close call, while your filter is probably the cause of your problem I just thought I would share my problem with you.
Last edited by Deltarat; 07-18-2006 at 09:50 AM.
