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CATEGORY LISTINGS > CUMMINS > Problems with with a Cummins 6CTA model C8.3-325 engine no 4535827B Ref. No. 53-34874-004 [ REFRESH ]
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Problems with with a Cummins 6CTA model C8.3-325 engine no 4535827B Ref. No. 53-34874-004

Created On Saturday May 17, 2014 09:40 Diesel Talk
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Note Saturday May 17, 2014 09:40 View users profile View thread in raw text format
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I have a 1997 American Dream MH with a Cummins 6CTA model C8.3-325 engine no 4535827B Ref. No. 53-34874-004 (see attached pictures of the data pate)

I purchased this MH last fall and have been having two ongoing problems, although the engine runs and pulls great.

Problem one is the oil pressure seems low.

I have taken several long trips (Arizona to New York, New York to Epping New Hampshire and back, New York to Bowling Green Kentucky and Back, and New York to Florida and back, and finally from New York to St Louis and back).

The running oil pressure has fallen a little bit during each trip to a point that currently after running for four hours at 65 MPH in 78 degree weather pulling a 28 foot trailer the oil pressure gauge reads just above 40 PSI. (Regular Oil changes and filter changes have been performed ). See attached picture of the dash (i tried to attach a link of a picture of the dash and cannot figure out how to do that (Help)

I should also mention that when started up cold, aloud to warm up and then driven the oil pressure reading is steady at 70, but sometimes spikes to 100, and then starts to fall off.

I have done a lot of reading on the internet (which is not a good source of information) and have found responses from don't worry about it to checking a number of things, several samples are below.

"There is a oil pressure regulator within the oil cooler housing"
"Actually the Cummins service manual spells out that 10 psi at IDLE with engine at operating temperature is the MINIMUM . But there are several areas that can cause this misread oil psi(1) as mentioned the oil pressure regulator valve ( oil cooler). (2) the wrong oil filter. (3) oil pressure sender weak."
"Oil pressure at start-up is 60 lbs.+, stays at 40 lbs running down the road at 65 mph. Drops to 10 Lbs at idle when fully warmed up."

I have been unable to find a "Good" Cummins repair shop in this area. I have found a gentleman that works for Rochester Transit System as their road mechanic that is willing to work on this unit.

I would very much like to hear your knowledgeable input on this concern.

I'm thinking what I will do about the oil pressure problem is replace the sending unit, the oil thermostat, the oil pressure regulator, the oil pump. All those parts are relatively inexpensive and easy to get to.

Problem number two is the engine continues to run after the key is turned off

It runs for up to 60 seconds and then shuts off. I have tried using injector lubricant but seems to have no effect on the problem

The shut down problem is not so easy, the price on the Fuel Shut Off Solenoid ranges for 500 to 700 dollars and I still have not found a way to tell if it is the Fuel Shut Off Solenoid or the valve.

link to shut off replacement

Glenn R. Lever
Rochester, New York 14617-2012
My Cars http://www.leverfamilysite.com/vehicles.htm

Front Engine Dragster Forum (I am an Administrator) athttp://www.frontenginedragsters.org/forum/index.php

Edited: Saturday May 17, 2014 at 09:44 by GlennLever
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