KILLER DOWEL PIN REPAIR KIT ('89-'93, 12V and '98.5-'02, 24V - 5.9L)

Item #: TST-KDP04
  • About This Product
  • Reviews
  • Install And Tech Information


We are all familiar with the 5.9-liter Cummins engine dowel pins in the '89-'93 and '98.5-'02 Dodge Turbo Diesel trucks. They are typically used to help locate and line up a housing-to-housing assembly. Such is the case with the Cummins 12-valve engines (and some early model 24-valve engines) where the gear case/timing cover assembles to the engine block.

The dowel pin used in the Cummins engine can back out of its bore. When it does, it can fall into the camshaft gear and cause all types of expensive engine damage.

The folks at TST Products have developed a kit to cover the dowel pin and prevent its movement. These year engines have a step, or shelf, between the tab retaining bolt, and the dowel pin. These kits come with a bent tab to accommodate the step.

The kit is inexpensive protection and includes:

  • Killer Dowel Pin cover tab
  • Timing cover seals
  • RTV sealant for timing cover
Unfortunately the labor involved to access the KDP and cover it with the cover tab is time consuming. However, clear instructions make it a job that they DIYer can handle. Read about dowel pin containment from TDR Issue 57. Click to open PDF (3 meg).

**This kit does NOT include a new cover gasket, rather a tube of RTV sealant like Cummins used on later B engines in place of a gasket. If you want to use a gasket on your '98.5-'02 truck, order Cummins part number 3918673.


Write a review
Almost everything you need
Dec 13, 2017  |  By Jeremiah
This kit is good and the instructions are good. I did order the timing cover gasket separately since reusing the old one or replacing the gasket with rtv didn't sound like a good idea. I think this gasket should be included in the kit. Be careful to install the main seal correctly with the plastic guard or you'll get a leak like I did(should have slowed down).

KDP kit needed shimmed to work
Dec 1, 2017  |  By Andy
I have a 93 12 valve I just recently purchased. I ordered this part and it arrived on time, the instructions were great. Very detailed. The only issue- my block had a ridge between the kdp and the bolt used to hold the small plate in place. I had to put a washer and lock washer behind the plate the shin it out far enough to seat properly. I don't know if this is a common issue with the earlier 12 valve trucks or just my block is different. Anyway it worked fine.

Great product
May 20, 2017  |  By Curtis De
The kit was perfect. I took care of my kdp and thanks to Geno's Garage I don't have to worry about it anymore

98-02 KDP kit
May 19, 2017  |  By Chris
I purchased the KDP kit for my 2001 Ram 2500, I noticed when taking of my timing cover that I had the newer timing case that had a grove around the KDP to prevent it from coming out. So I did not need the KDP and it would not fit either way on the newer style case. Best pricing for the KDP kit regardless and needed to do my Crank seal so I guess it wasnt a pointless purchase.

93 Cummins
May 6, 2017  |  By Robert Leigh
My kdp washer bend was not big enough bend to make it over the dowel step which caused the washer to not sit flush on the timing case. I had to chip at the flange in the timing case and cut a small portion of the washer off at the bend to get it to where I was comfortable. I would have gone with a different kit if I had known it would lead to the extra work. Would not have been that big of a deal but I did not fix it the first time and it kept bugging me. When I went back in the bolt was not backed out, but was definitely loose.

93 cummins KDP
May 2, 2017  |  By Jason S.Pierre
excellent product, exact fix and well made kit

Apr 29, 2017  |  By Donald Egolf
Great product, parts are high quality.made job easy !

Killer dowelpin kit
Mar 23, 2017  |  By Wade Stewart
Kit arrived in a timely manner no damage during shipping .kit was installed without any issues and has performed extremely well so far and no leaks from the seal or gasket material thanks

Good Service, Good Product
Feb 7, 2017  |  By Matt
The KDP kit had everything I needed for a good install on my '93 D250. Install instructions are very thorough and detailed. Customer service was great, I had one question and Robin went back and got my answer from a tech. in a few seconds.

Jan 14, 2017  |  By Timothy Bailey
Repair kit appears to be high quality and has great instructions. Genos even sent me a 2017 calendar..very cool!!!

Install and Tech Information

'Killer Dowel Pin' Instructions.pdf