Engine/Transmission (1994 - 1998) 12v Oil cooler jets?

[Fordiesel69]

While at breakfast last weekend I overheard clearly a conversation between two guys and the one was stating he had owned over 20 rams w/CTD's thru the years since they first came out. He claimed that all the engine since first introduction had flaws that allowed the piston oil jets to come out and fall into the oil pan, and that the damage was being done slowly over time until finally a cylinder started to burn oil. After happening to alot of his trucks he said the only soltion was an aftermaket remanufactured engine that had a "redesigned" jet that the rebuilder made.



After doing lots of searches, I have read that this is common on the 24v, but I was not able to find anything on the 12v. Is this really a problem and how would you ever know if a jet falls out? Of course eveyone who is unsatisfied will over exagerate and I think that is the case with this guy.

 

[PRattenbury]

Well, I won't make this an overblown statement, but when I had my 12 valve rebuilt, 3 of the oil jets were not there anymore. It could be they fell out when I disassembled the engine, or maybe they fell out during the 230k miles I had on it at that time. I couldn't say for sure. But I did have scored cylinders, and that might be the reason why.

 

[Fordiesel69]

Is there a way to look thru the oil plug hole to see if they are laying in the bottom? If they do fall out will you ever kow? Or is it silent destruction?

 

[Hammer]

The oil pan on my truck was changed at about 165,000 when we installed the chromed pan. Nothing other than the lost second KDP was found inside the pan at all... ..... Andy

 

[Lightman]

They cant just fall out if they do come out its likely because they were crackek or broke when installed. There are two different lengths long and short which one is required depends on the year of the block. They are plastic so they will break easy when installing. Many people like to use a hammer and a punch to tap them in, thats a big no no. They will crack and break and it wont even show.

 

[MCummings]

The 3rd gens use metal jets so I've been told.



Merrick

 

[Vaughn MacKenzie]

On the 3rd Gen engines which have gallery cooling (in addition to piston cooling) you have two sets of jets, the ones on the rods for the pistons like all 5. 9 Cummins have, and the ones mounted on the block (the Q jets) to spray oil into the piston crown gallery. The gallery cooling I believe is on the HO 3G engines, and all 600 series.

As far as jets coming out of the rods I never heard it before, but sounds like it's possible. I've only heard of the cases of the jets getting clogged by Fram oil filters failing, which quickly destroys a cylinder under load.

 

[Missouri Mule]

I've read where the 24 valves are plastic but the photos of the 12 valves looked to be metal. But they coluld of been painted silver/grey to look like metal.

 

[tgordon]

I have not heard of this on the Cummins, but the Powerstroke is a differant story. Neighbor had it happen, and the only reason he knew was because it came out when he changed the oil, but those are on the block. The dealer said they could replace it but he would not like the bill, and told him he should just baby the engine. Needless to say he got rid of that truck.



I would think you could take a borescope and look up through the pan drain hole, or even more in depth pull the oil pan.

 

[ata]

On the 3rd Gen engines which have gallery cooling (in addition to piston cooling) you have two sets of jets, the ones on the rods for the pistons like all 5. 9 Cummins have, and the ones mounted on the block (the Q jets) to spray oil into the piston crown gallery. The gallery cooling I believe is on the HO 3G engines, and all 600 series.



All Cummin's 5. 9's have piston cooling jets in the block. They are pressed in to the block, under the block half of the main bearing. There are no jets in the rods of a 5. 9. The jets have a shoulder on them to hold them in the block. If they are improperly in stalled (by to much pressure) the shoulder will crack and separate from the barrel and the barrel will push out. Cylinder damage will happen sooner or later. There is no way to inspect them without removing the crankshaft and bearing.

The later 350 hp 650 tq engines have oil piston cooling nozzles. (which are metal tubes protruding from the jet holes) The nozzle is aimed at a hole in the bottom of the piston. Which is the opening to an oil galley in the top of the piston. When the piston is at near bottom of the stroke the oil is shot in to the hole and circulates inside the top of the piston. Plus the oil is sprayed on the bottom of the piston at the same time.

 

[Vaughn MacKenzie]

All Cummin's 5. 9's have piston cooling jets in the block. They are pressed in to the block, under the block half of the main bearing. There are no jets in the rods of a 5. 9. The jets have a shoulder on them to hold them in the block. If they are improperly in stalled (by to much pressure) the shoulder will crack and separate from the barrel and the barrel will push out. Cylinder damage will happen sooner or later. There is no way to inspect them without removing the crankshaft and bearing.

The later 350 hp 650 tq engines have oil piston cooling nozzles. (which are metal tubes protruding from the jet holes) The nozzle is aimed at a hole in the bottom of the piston. Which is the opening to an oil galley in the top of the piston. When the piston is at near bottom of the stroke the oil is shot in to the hole and circulates inside the top of the piston. Plus the oil is sprayed on the bottom of the piston at the same time.

Ah OK, makes sense, thanks for setting me straight on that ata

 

[ROADWARRIOR]

There was a guy here that lost a motor to this problem maybe a year ago.