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500 EFI High temp Low pressure

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500 EFI High temp Low pressure

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Old 05-14-2018, 09:01 PM
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Default 500 EFI High temp Low pressure

High oil temp and low pressure… STILLThis problem started late last year. I was running pretty hard in some rough water and we came down hard on our starboard side. A few miles later my alarm sounded. The starboard motors oil temp was 230+ and oil pressure was dropping to 22 PSI. Got it home. Motor was pulled, oil pump checked with a drill at 60+ PSI. Replaced the pump and pick up anyway. Than with a drill checked it and its at 70 PSI. No damage was seen on the old parts. Oil cooler was replaced with a new one. Oil thermostat was replaced and again no damage seen. So today both engines have new oil and filters, Spark Plugs, New 140 deg. thermostats in the intake, Starts on the second try after all winter. Take it out and run it and all is good until I start getting over 4000 RPMs. Just like before starboard oil temp climbs to 200 - 210 – 215 than 220 degrees and rising and oil pressure drops to 22 PSI from 40. Shut it down. Port motors oil temp holding at 172-174 degrees. Water temps 160 and 162 per side, volts 14 per side, Water pressure 15-18 PSI per side. Last year these oil pressures were backed up by a manual set up. I am at wits end. 500 EFIs 560 hours and 40 hours after complete rebuilds. What am I missing ?
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Old 05-15-2018, 01:07 PM
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Do you have oil thermostats? If so it could be failed not letting the oil flow through the cooler........................never mind, I just reread your post and see where you replaced it.
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Old 05-15-2018, 01:11 PM
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How about the lines and fittings going to and from the oil cooler? Have they been checked for blockage?
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Old 05-15-2018, 02:02 PM
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I was thinking about replacing the lines. I dont know about them being blocked I was thinking maybe one could be sucking shut. I dont know.
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Old 05-15-2018, 03:33 PM
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That would be where I'd start.
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Old 05-16-2018, 08:08 AM
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where does the water come from,drive,thru hull?
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Old 05-16-2018, 08:49 AM
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Originally Posted by sutphen 30 View Post
where does the water come from,drive,thru hull?
Are you thinking corrosion at the transom fitting?
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Old 05-16-2018, 09:02 AM
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Originally Posted by payuppsucker View Post
Are you thinking corrosion at the transom fitting?
yup
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Old 05-16-2018, 10:59 PM
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Originally Posted by sutphen 30 View Post
where does the water come from,drive,thru hull?
Thru the outdrive. I never thought of that. Thanks guys I will check it out.
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Old 05-17-2018, 07:08 AM
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Keep us posted............
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