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Old 06-22-2012, 11:01 PM   #1
cf43
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Cat 3406B low oil pressure

Hi, new to the board and need help diagnosing an oil pressure problem with a CAT 3406B. Just did an in frame and while we cranked the motor over with the starter the gauge was showing 40+lbs of oil, after enabling the fuel system and firing it up for the first time the oil pressure dropped to about 15lbs at idle and 30 at high RPM's. Replaced the oil filter thinking that it was clogged but that didn't help the oil pressure come up any at all. Hooked up a 2nd pressure gauge which verified the low oil pressure readings.

Any ideas on how to correct the oil pressure issue? Before the in frame the oil pressure was great. The engine was overhauled due to high mileage and a broken piston. The oil pump was not replaced during the in frame.

I've read that if the jake brakes are hooked up incorrectly it will cause low oil pressure. Pretty sure we hooked those up right but how do we check to make sure they were installed correctly? The jakes seemed to be working properly when the truck went for its maiden voyage.

Thanks for the help!
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Old 06-22-2012, 11:19 PM   #2
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I would pull pan right now and check the o/rings on the oil pump pipes and then pull plunger out of pump and check. Also if you have droped a rag in there you will find it around the oil pump pick up screen. Just a tought but check the size of brg that came out to the new brgs installed.
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Old 06-23-2012, 01:53 PM   #3
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Everything theakerstwo said and check to make sure a piece of shrapnel isn't caught in the bypass valve
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Old 06-23-2012, 08:22 PM   #4
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Yanked the oil pan off and here's what we found: two piston oil jets in the oil pan. Had a guy working for us who didn't do too well of a job on some other areas of the engine, so far everything he's touched we've had to go thru and redo.

Anybody know how much of a bear it is to change out the oil jets with the crank still in place?
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Old 06-23-2012, 10:15 PM   #5
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Quote:
Originally Posted by cf43 View Post
Yanked the oil pan off and here's what we found: two piston oil jets in the oil pan. Had a guy working for us who didn't do too well of a job on some other areas of the engine, so far everything he's touched we've had to go thru and redo.

Anybody know how much of a bear it is to change out the oil jets with the crank still in place?


Piece of cake. A long extension (12"+) and the correct socket. 7/16 IIRC for most. Remove the bolt/jet and reinstall a new one.

The more important thing is how the engine was run when it was run/test driven. Chances are it is fine, but if it had been hauling a trailer or a load then I would be looking very closely at the two cylinders that have the broken jets. If there was alot of heat put to the cylinders for a period of time then the cylinders may be scored up. If it was just test driven for a few miles it will probably be fine, but should still be checked out.
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Last edited by AaronF; 06-23-2012 at 10:20 PM.
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Old 06-23-2012, 10:36 PM   #6
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Piece of cake. A long extension (12"+) and the correct socket. 7/16 IIRC for most. Remove the bolt/jet and reinstall a new one.

The more important thing is how the engine was run when it was run/test driven. Chances are it is fine, but if it had been hauling a trailer or a load then I would be looking very closely at the two cylinders that have the broken jets. If there was alot of heat put to the cylinders for a period of time then the cylinders may be scored up. If it was just test driven for a few miles it will probably be fine, but should still be checked out.
The engine has maybe two miles on it since the rebuild and not even two hours of run time tops, it has yet to see a trailer so my hopes are high that we haven't messed anything up.

Would you happen to know the torque specs for putting in the oil jets? Also, is there any type of gasket or washer that goes between the jet and the block?
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Old 06-23-2012, 11:37 PM   #7
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Yanked the oil pan off and here's what we found: two piston oil jets in the oil pan. Had a guy working for us who didn't do too well of a job on some other areas of the engine, so far everything he's touched we've had to go thru and redo.

Anybody know how much of a bear it is to change out the oil jets with the crank still in place?
Let me tell you this. The first thing i learn to do years ago before pulling the pistons is to pull the piston cooling nozzles. You can do it and ant no problem to do. I have seen mechanics that has do this for years not pull them and their story is always the same that i am carefull when i pull them out. The problem is when you install the rods and pistons you can be sure if you bent one or just cracked it. So pull them and you dont have a problem later.Your mechanic is not been working on cats or macks or DD much. The 855 cummins is no problem and the later cats can be done but why take a chance. glenn
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Old 06-24-2012, 01:54 AM   #8
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Let me tell you this. The first thing i learn to do years ago before pulling the pistons is to pull the piston cooling nozzles. You can do it and ant no problem to do. I have seen mechanics that has do this for years not pull them and their story is always the same that i am carefull when i pull them out. The problem is when you install the rods and pistons you can be sure if you bent one or just cracked it. So pull them and you dont have a problem later.Your mechanic is not been working on cats or macks or DD much. The 855 cummins is no problem and the later cats can be done but why take a chance. glenn
Lesson learned for sure! I'm just thankful that we didn't learn it any harder than we did.
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Old 06-24-2012, 02:04 AM   #9
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I am glad youn found it the easy way instead or having to tear it down again.
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Old 06-24-2012, 01:45 PM   #10
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Would you happen to know the torque specs for putting in the oil jets?
I don't know the torque specs. I'm sure they are here in the Heavy Duty section somewhere.
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