1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

oil pressure? is this too low??

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Old Sep 13, 2012 | 12:29 PM
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Default oil pressure? is this too low??

ok i am recently new cummins owner as of 4 days ago. i am going to be doing a cummins swap in my chevy. the dodge i bought has 132k on it and i am trying to drive it and put some miles on it before i pull it. the truck didnt get driven much by the prior owner. i changed the oil and have been driving it. runs VERY strong i just as curious if i should be alarmed by the gauge reading this low. theres no numbers on the gauge so i am not sure as to what psi it is ACTUALLY at so if anyone could help me out it would be appreciated. i dont want to swap this in and have the motor grenade due to low oil pressure and waste all my money i paid for it.


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also another question is did these first gens all come with the same gear ratio in the rear end?? i am swapping this 12valve into my chev dually with smaller tires and she already is screaming high in the rpms at 60mph so curious as to what came in these
 

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Old Sep 13, 2012 | 12:35 PM
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put a real gauge on it before you pull the engine. that gauge is just a reference and its old. who knows if its accurate.
 
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Old Sep 13, 2012 | 12:41 PM
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Originally Posted by turbo2332
put a real gauge on it before you pull the engine. that gauge is just a reference and its old. who knows if its accurate.
makes sense wheres the best place on these motors to use to put the sending unit? whats acceptable psi range?
 
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Old Sep 13, 2012 | 01:14 PM
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min 10 at idle
min 30 working
max 70 working
 
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Old Sep 13, 2012 | 06:46 PM
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No, they did not all come with the same rearend or the same gear ratio.

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Some had 4.10 ratio, some had 3.73, etc.
 

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Old Sep 13, 2012 | 07:00 PM
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You fail to mention if that guage reading is at idle, or riding down the road.

Regardless, that image shows a pressure reading within the normal range. If you're concerned about its accuracy, replace the sender mounted on the driver's side of the engine block, right above the driver's engine mount.

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Old Sep 13, 2012 | 07:20 PM
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That reading is at idle
 
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Old Sep 13, 2012 | 07:52 PM
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I agree it's probably just the guage or sender, that milage it's just gettin broke in.
 
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Old Sep 14, 2012 | 09:21 AM
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Originally Posted by turbo2332
put a real gauge on it before you pull the engine. that gauge is just a reference and its old. who knows if its accurate.
^Ditto^ & that's an awesome low mileage 12 valve! Is the dodge body that bad to be installing it in a Chevy!!!! A restored 1st gen is BAD!
 
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Old Sep 18, 2012 | 03:58 PM
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So I am going to by an external oil pressure gauge and put it on before I pull the Motor so I can make sure there will be no problems. Where can I put the fiting on th
e block for the gauge?
 
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