Oil Pressure Question

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I was wondering what is the common oil pressure in the CPL 804 engines (pre intercooled, those built before Jan. 1991) My 1989 idles at 27-28 PSI but at highway cruising approx. 1900 RPM. it only runs in the low 40-41 PSI. I would think if the bottom was getting tired the low idle oil pressure would also be low. I was beginning to be suspect of the relief valve. Looking for some insight here. Thanks John.

 

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I don't know the exact measurement on the pressure, but I do know the electric sender
on mine only works intermittently.
The family mechanic/fire chief who services
all the municipal emergency vehicles(Macks and Navistars) and a few Dodge/Cummins around town said the sender failure is very common, the only sure-fire way of getting a proper pressure reading according to him,
was to use a mechanical gauge as opposed to an electrical one.
just a thought
joe

 

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I am using a mechanical 0-80 Stewart-Warner 270 degree sweep indicator and the feed point is the main oil rifle (same as factory) Sorry I didn't mention it .

 

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Mine dides hot at the first or second hash mark, and runs at hiway speeds at the fourth hashmark. I'm told that is normal!

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http://coffeewithJesus. homestead.com/web1.html 89 1-ton, Amsoil System 3000 5-30,K&N air filter, cleaned-up exhaust, Dynomax straight-thru, rebuilt pump, 12cm wastegated turbo, thermostaticly controlled twin 14" electric fans, intercooler, modified 518 OD transmission, Gear vendors OD controler, R-134, louvered fenders, 93 aftermarket smoothe grille; 78 35'Avion, 93 Lance 900 slide in with generator and power jacks. Jesus saves!

 

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The Cummins Spec is 30 psi minimum at full load and 10 psi at idle. You could replace the pressure regulator spring and see if there is improvement, next item would be the oil pump.

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'93 W350 Club Cab, Bright White, 5 sp. , 132K, Factory Options: LE, 4. 10 Limited Slip, 7600 lb. rear springs, tachometer, front stabilizer bar. Mods: Banks stinger plus, Linex bedliner, 25,000 lb gooseneck ball, 10,000 lb receiver, Tekonsha brake controller, POWER WAGON injectors-WAY faster than stock!.