Cummins 6bta oil pressure issue

[Raymond Slingerland]

1986 Trojan International 10 meter express, Cummins 6bta 300hp, about 1992. CPL 970. Oil pressure gages read pressure by oil pressure not dc signal of some kind. No wire to it, just the tube. Starboard reading high about 80 at idle, before warm up and oil change. Swapped gauges. Then the other one read high, and the previous high gage read 60 which was consistent with previous pressure for the engine now hooked to it, so don’t believe it is the gauge. Changed oil and oil filter. Put in 13 quarts, with 1/2 quart in filter. This should be the low oil mark per your notes. Reading on dip stick indicates about 3/8 inch below the low oil mark which was inscribed on the present dip stick so don’t believe overfilled is the problem. Cranked it up and oil pressure went to 75 at idle while cold. Advancing throttle pegged the gage. After it warmed up gage read around 50psi at idle, but upon advancing throttle, say 2200rpm, it pegged again. Reduce throttle, back to 50 psi at idle, 725 rpm. Now maybe the oil sender unit to the gage is bad? Is that possible? Is there more involved than just a tube hooked to a hole in the engine? Don’t know about them. What are the situations with the engine that could be causing the high pressure?
As a note, when sea trialing the boat, that engine didn’t want to turn up, and temp increased, Owners mechanic suggested aftercooler causing a problem. Was told he took aftercooler off and cleaned it. We brought it home at 2400rpm, 3 hours, temp., ok but oil pressure about 80-90. on that engine. Thanks

Topic

[Rob Schepis]

Raymond Slingerland wrote:

It is apparent we need to exercise the boat more frequently. Turn up at dock doesn’t do it. Our bad.

No truer words ever spoken!

Running the engine at the dock is good for checking on things, that is it, otherwise it does more harm then good.

You’re making progress………

[Raymond Slingerland]

Update and can close this one.

Do appreciate the forum. Update. Taking the boat over to the marina the oil pressure settled down at max of 75psi and 35 idle, and although one turbo didn’t turn up during the trip, it did later after changing the fuel filter. It is apparent we need to exercise the boat more frequently. Turn up at dock doesn’t do it. Our bad.
With those lessons behind us I have just ordered your SMX 1730 sea water pumps and going to replace existing ones even though the sales ad for the boat said “new pumps”. The picture seems to belie that assertion.. Kevin in your parts did a good job, Since the 300 hp wasn’t listed in your sales ad I give him a call and after I sent him a picture he said they would fit.Also going to put on the new air filters I got from you as well.
So appreciate all your tips–I’m and old guy, 85, so appreciate putting up with me.

[Raymond Slingerland]

oil pressure

Sorry I am wasting your time. Appreciate your opinion, but answer to question would be helpful regarding oil pump. Help me know how to respond to Mech.
As to function and process for fix. Also, “not one hook up is proper”. Does that mean those shown on the engine are incorrect? Is the pressure line to the gage from the oil pump housing wrong? As noted, there will be a gage and it will be hooked up by a mech. that knows a lot more about it then me. Not sure about the “spend $150.00 and get a gage when it was noted that was going to be done. But it would be helpful if I knew the next step when the $150.00 gage shows high oil pressure so i know how to respond to the Mech’s call what ever it is. But sorry trying to find that information was wasting your time. Rest assured I won’t waste any more of your time after this post. Ray

[Tony Athens]

How can someone make that call based on what you have in you pictures and have done to this point.. .. Not one hook-up is proper………Nor, do you have a proper gauge to make proper readings…………… NOT ONE.

Spend less that $150 and get yourself and proper gauge , a proper 3-5ft hose whip, a few fittings and do it right.. Until you do that you are just wasting your valuable time, along with everyone here that is trying to help..

Tony

1 user thanked author for this post.

David Wesner

[Raymond Slingerland]

oil pressure next step

Talked with mech where we will be pulling the boat Wed. He is going to meet us tomorrow when we bring it in. He suggested oil pump not bypassing as rpm comes up and pressure builds up. Have to lift the engine to remove oil pan to get to the pump. ??? Mech. will have a pressure gage to hook up first. Will he hook up at the top of the oil filter housing where the source to the gauge on the instrument panel originates? And do you have to remove oil pan to get to the pump?

[Corey Schmidt]

Let’s get good accurate numbers first and understand how you’re getting them…. and then let’s discuss “next steps”…

[Raymond Slingerland]

high oil pressure?

Will have gage hooked up tue. afternoon and go on the hill Wed morning. If pressure is high what is the next step?

[Raymond Slingerland]

oil pressure

Ok, will do. If pressure reads high as before what is the next step?? Thanks

[Rob Schepis]

I’d go with an independent line and gauge off the main oil galley. A liquid filled 100++ psi gauge on a short hydraulic type hose.

[Raymond Slingerland]

oil pressure

Ok, got some help. Pressure comes off of the top of the oil filter housing in a large hose. Od looks to be at least a 1/2 inch. Than in the bulkhead up to the gage it narrows down to the very small house as picture. Even though I changed the oil filter, would remaining residue else where in the system cause the oil pressure to be high coming out of the top of the oil filter housing?

[Raymond Slingerland]

oil pressure

Than would pic. 2 represent the oil pressure to the gage?
Also, are there some sources here on the forum that would show the type, location, etc. of the zincs on the engine?

[Tony Athens]

Pic 004 is measuring boost or intake manifold pressure ————???

Tony

[Raymond Slingerland]

Update with numbers and pic.s

Here are pictures and numbers.

Picture and numbers. Appears to be two hoses off top of block, forward on the engine. The smaller hose seems to match the hose on the gage.

Numbers– Outside air temperature 68 degrees. 3pm in afternoon, with sunshine

RPM Engine Temp Oil Gage pdi
Cold start 730 No indication yet 78
2 min. run time idle None yet 73
1500 None yet past 80
1675 155 degrees 80
2000 160 85 psi
Back to idle
732 160 38 psi.

[Tony Athens]

Post a really good picture of the gauge and one of where i/ how it connected to the engine(s)..

Tony

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