Oil Pressure Issues

[CrewCabDiesel]

I beginning to think I put in both sets of jets, any way to block the saddle jets?

 

[cerberusiam]

What engine do you have, SO or HO. IIRC, the SO would have had only saddle jets, the early HO's I think had both saddle and j-jets. If you had the engine hot tanked and did not replace the saddle jets it probably blew them out or the hot tank ate them out. Drop the pan and pull number 6 main and see if you bearings are wiped out, fastest way to see if you have an issue there.

Did you clearance the bearings when you installed them? You for sure had the correct clearances on the mains?

 

[CrewCabDiesel]

I had the machinist mic crank for bearing size and I plastic gauged both mains and rod journals, to be sure their in spec. I had two early 2004 complete Cummins motors I was working with, the original motor block had a couple of cylinders badly worn with a really nice rotating assembly, crank had no wear. The other Cummins was a low mileage motor that a oil change company left the oil filter loose and it dumped all the oil and spun half the rod bearings. That block and head were machined, head ported, the original motor crank and rods with new pistons/wrist pins were balanced. Both motors are 305 hp, built 11/2003 and 12/2003
Today that motor has about 100k miles, has no blow by, used a quart of oil at 6000 mile oil change. Oil used is rotella T6 15W40. It was on a Dyno with 4:10 gears pulled a 663 hp at rear wheels. Truck now has 3:73 gears

 

[CrewCabDiesel]

Still driving the truck oil pressure holding at 98 degrees outside and full engine temp. at 10 psi at idle and in gear, at 2500 rpm, running 60 psi.
Question, anyone by chance bolt and thread size for the main bearing caps? Was thing of making bolts to raise and lower the crank shaft if ! need to do something with the saddle jets. make for 4 longer bolts using the bearing caps to make access to the saddle jets while the motor is still in the truck. Any ideas on that?

 

[cerberusiam]

Don't think you can get to the saddle jets form the bottom. IIRC, only accessible thru the cylinder.

 

[CrewCabDiesel]

Thought they were installed from under the main bearings?

 

[cerberusiam]

Saddle just on top of the main bearing assembly drilled into the block adjacent to the main bearing oil feed. J-jets are tapped of the cam oil feed, you have to have the crank and pistons out to really work on things.

 

[CrewCabDiesel]

Well it's the worst case scenario, pulled the pan yesterday, I did have both J Jets and saddle jets installed. bearings and crank shaft look fine. Some wear on mains but nothing major. Cylinders and pistons look great, a little carbon build up. Order all new bearings, new rings and Attitude Performance saddle jet plugs along with new gaskets. Should I use a zinc additive for break in again? and am I forgetting anything?
Thanks Kyle

 

[cerberusiam]

Better than normal if it did not wipe out the rear 2 main bearings. Did you get the good Clevite main bearings with the 1 piece thrust bearing? Did you order the rings with the wider gap on them?

Not gonna hurt to run the additive again with new bearings.

 

[CrewCabDiesel]

Rear mains had some wear, but still had many miles on them to go, rod bearings looked very good. No metal in the bottom of oil pan. I ordered Clevite bearings, Mahle Rings, Cummins head gasket, front and rear main seals. rings are .020 over to match the pistons and I will gap the rings. What do you recommend for ring gap, stock top .010-.014, middle .033-.045 oil ring .010-.022? I'm now reading stock gap is a bad idea for non stock motors and heavy tow applications. S**t, I just realized I forgot to order exhaust gaskets.

 

[cerberusiam]

IIRC, .020-.022 on the top ring the rets stock. Make sure the bearing set has the 1 piece thrust bearing. This is what happens with stock ring clearance son top ring and too much heat.

 

[CrewCabDiesel]

Motor is back together and running, oil pressure is at cold idle is 70 psi, hot idle 31 psi. Motor running much better, very smooth. Finishing putting the final touches and will be break in driving today.
I do need help with one thing , forgot to take a picture of the injector wiring harness on the top motor, can someone post a picture of their motor?
Thanks
Kyle