killer dowel pin
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Joined: Apr 2009
Posts: 3,719
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From: Lexington SC
yep
Diesel Fan
Joined: Dec 2010
Posts: 37
Likes: 4
From: Sterling, Va
Dowel Pin Repair Kit for 94-98 Dowel Pin Repair Kit for 89-93 or 99-02
If you have heard of “dowel pin issues” on the 12 valve Cummins 5.9 with the P7100 Bosch injection pump then you may already have taken care of your truck. This dowel pin issue applies to all ’89-’98 12 valve Rams with Cummins engines and many other non-Dodge Cummins 12 valve engines. If you have not heard of the issue, or you heard yet have done nothing and you are the owner of one of these vehicles, listen up. A dowel pin failure could destroy your engine completely or do no damage at all.
The aluminum front gear housing on the 5.9 Cummins is precisely located on the front of the cast iron engine block using dowel pins. The dowel pin is about 5/16 inch diameter by 3/4inch length made of steel. During engine assembly the dowel pins are driven into holes drilled in the block such that about half their length protrudes. Matching holes in the gear housing permit a precise fit of the housing the block. Several cap screws are used to hold the housing to the block. The problem with the dowel pin occurs because the hole in the aluminum gear housing was drilled through. During engine operation vibration could cause the dowel pin to work its way out of the hole and fall into the gear case. When the dowel pin falls, it can drop right to the oil pan or land in the gear housing, causing no damage at all.
On the other hand, the pin can be caught in the camshaft gear and forced into the aluminum gear housing, breaking out a big chunk of the housing which would cause a huge oil leak and an expensive, time consuming failure.
Worst-case failure is when the dowel pin goes between the cam and crank gears, or cam and injection pump gears, breaking the gear off the camshaft. The camshaft stops rotating instantly causing valves to stop operating, leaving some valves open and some closed. The crankshaft continues to rotate for a few seconds, slamming pistons into valves, and possibly ruining block, crank, rods, cylinder head, and valve train. Almost no reusable parts in this case, a complete engine swap could be required.
If you are the owner of one of these 12 valve 5.9 engines and you haven’t taken preventive action, we suggest you take action before the vehicle strands you in a bad location and sticks you with an expensive repair bill. TST offers a “Dowel Pin Kit” that includes the parts you need to access the dowel pin, positively lock it in place so that it does not come out. Installing this kit requires removal of the engine fan shroud, fan, damper, and front gear cover to gain access to the dowel pin. Once the dowel pin is secured, a new crankshaft seal included in the kit is installed in the gear cover and all parts are reinstalled. This kit sells for $65 and takes about 4 hours to install. See DowelPina.pdffor complete installation instructions
Kit includes the parts needed to fix the famous dowel pin problem on the 1989-1998 Dodge diesels.
If you have heard of “dowel pin issues” on the 12 valve Cummins 5.9 with the P7100 Bosch injection pump then you may already have taken care of your truck. This dowel pin issue applies to all ’89-’98 12 valve Rams with Cummins engines and many other non-Dodge Cummins 12 valve engines. If you have not heard of the issue, or you heard yet have done nothing and you are the owner of one of these vehicles, listen up. A dowel pin failure could destroy your engine completely or do no damage at all.
The aluminum front gear housing on the 5.9 Cummins is precisely located on the front of the cast iron engine block using dowel pins. The dowel pin is about 5/16 inch diameter by 3/4inch length made of steel. During engine assembly the dowel pins are driven into holes drilled in the block such that about half their length protrudes. Matching holes in the gear housing permit a precise fit of the housing the block. Several cap screws are used to hold the housing to the block. The problem with the dowel pin occurs because the hole in the aluminum gear housing was drilled through. During engine operation vibration could cause the dowel pin to work its way out of the hole and fall into the gear case. When the dowel pin falls, it can drop right to the oil pan or land in the gear housing, causing no damage at all.
On the other hand, the pin can be caught in the camshaft gear and forced into the aluminum gear housing, breaking out a big chunk of the housing which would cause a huge oil leak and an expensive, time consuming failure.
Worst-case failure is when the dowel pin goes between the cam and crank gears, or cam and injection pump gears, breaking the gear off the camshaft. The camshaft stops rotating instantly causing valves to stop operating, leaving some valves open and some closed. The crankshaft continues to rotate for a few seconds, slamming pistons into valves, and possibly ruining block, crank, rods, cylinder head, and valve train. Almost no reusable parts in this case, a complete engine swap could be required.
If you are the owner of one of these 12 valve 5.9 engines and you haven’t taken preventive action, we suggest you take action before the vehicle strands you in a bad location and sticks you with an expensive repair bill. TST offers a “Dowel Pin Kit” that includes the parts you need to access the dowel pin, positively lock it in place so that it does not come out. Installing this kit requires removal of the engine fan shroud, fan, damper, and front gear cover to gain access to the dowel pin. Once the dowel pin is secured, a new crankshaft seal included in the kit is installed in the gear cover and all parts are reinstalled. This kit sells for $65 and takes about 4 hours to install. See DowelPina.pdffor complete installation instructions
Kit includes the parts needed to fix the famous dowel pin problem on the 1989-1998 Dodge diesels.
Diesel Bomber
Joined: Oct 2010
Posts: 1,150
Likes: 29
From: Childress,TX
would you really want to take that risk though? compare $65 and a few hours to a new engine and a lot of hours. of course it could still happen. it may just be slow or just pop out all of the sudden. $65 is cheap insurance
Diesel Enthusiast
Joined: Nov 2010
Posts: 111
Likes: 10
From: South Dakota
http://www.genosgarage.com/GenosGara...erDowelPin.pdf
From what I have read the dowl pin is a problem all the way to 01 or 02. Cummins was good on not leaving parts lay around, so if it was there for the taking it was put on the engine.
http://dieseldatabase.com/dodge-cumm...-dowel-repair/
Some more info on the kdp
http://dieseldatabase.com/the-infamo...mins-53-block/
Info on 53 block
---AutoMerged DoublePost---
From what I here its more of a problem on the 2nd gen 12vs. The non stepped cases have been found on 2nd gen 24vs. It is a concern on ALL 12vs. The pin killed the cam on my 91 about 6 years ago.
From what I have read the dowl pin is a problem all the way to 01 or 02. Cummins was good on not leaving parts lay around, so if it was there for the taking it was put on the engine.
http://dieseldatabase.com/dodge-cumm...-dowel-repair/
Some more info on the kdp
http://dieseldatabase.com/the-infamo...mins-53-block/
Info on 53 block
---AutoMerged DoublePost---
From what I here its more of a problem on the 2nd gen 12vs. The non stepped cases have been found on 2nd gen 24vs. It is a concern on ALL 12vs. The pin killed the cam on my 91 about 6 years ago.
Last edited by bulldog77; Mar 27, 2011 at 12:14 PM. Reason: Automerged Doublepost
