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Old 07-15-2018, 11:35 PM   #1
Mini-Skoolie
 
Join Date: Sep 2016
Location: TEXAS
Posts: 42
Year: 1999
Chassis: MVP ER
Engine: 5.9 Cummins
Oil Pressure Issues

I have this problem with my oil pressure gauge reading about 95 psi at idle and 98 when loaded. Someone on here sometime ago said that most likely it is the oil pressure sending unit. So I decided to get it changed before I hit the road this Friday.

Where will I find that switch? I have a 1999, 5.9 Cummins rear eng., with 24 valves. I have found the fuel filter, external trans filter, and shame on me, I don't remember seeing the oil filter. It was late so I get back under there tomorrow.
Anyway the parts guy said that it should have 3 wires coming off of it. But where is located. Thanks.
budbud7 is offline   Reply With Quote
Old 07-16-2018, 12:39 AM   #2
Bus Nut
 
Join Date: Jun 2016
Location: Orange County, CA
Posts: 698
Year: 1990
Coachwork: integral
Chassis: Crown Supercoach II (rear engine)
Engine: Detroit 6V92TAC, DDEC 2, Jake brake, Allison HT740
Rated Cap: 37,400 lbs GVWR
Quote:
Originally Posted by budbud7 View Post
I have this problem with my oil pressure gauge reading about 95 psi at idle and 98 when loaded. Someone on here sometime ago said that most likely it is the oil pressure sending unit. So I decided to get it changed before I hit the road this Friday.

Where will I find that switch? I have a 1999, 5.9 Cummins rear eng., with 24 valves. I have found the fuel filter, external trans filter, and shame on me, I don't remember seeing the oil filter. It was late so I get back under there tomorrow.
Anyway the parts guy said that it should have 3 wires coming off of it. But where is located. Thanks.
Don't some oil pressure gauges show the maximum when their wires are shorted? It could be as simple as a short somewhere, maybe?

John
Iceni John is offline   Reply With Quote
Old 07-16-2018, 01:29 AM   #3
Bus Crazy
 
Join Date: May 2016
Location: Georgia
Posts: 1,161
Year: 2001
Coachwork: Blue Bird
Chassis: IH
Engine: T444E
Rated Cap: 14
Quote:
Originally Posted by Iceni John View Post
Don't some oil pressure gauges show the maximum when their wires are shorted? It could be as simple as a short somewhere, maybe?

John

I've had a failed oil pressure sensor cause the gauge to show excessively high readings.


More than once, if memory serves me correctly.
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Old 07-16-2018, 09:19 AM   #4
Bus Nut
 
Join Date: May 2014
Location: West Ohio
Posts: 839
Year: 1984
Coachwork: Bluebird
Chassis: International 1753
Engine: 6.9 International
Rated Cap: 65
Should be on the left side of the engine(passenger side if it is an RE bus)
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