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Old 06-24-2019, 08:35 PM   #1
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Cummins Dowel Pin Failure

I have a 98 Monaco Diplomat with a Cummins ISB motor with only 87,000 miles on it. Appears I have a KDP - killer dowel pin problem, which lead to cracked inner gear cover, and gear housing needing to be replaced. Anyone have experience with this, and/or suggestions? Any chance Cummins may pay for the repair despite the motor's age? Motor ran good until this happened. There's a lot of labor involved. There is a lot on the internet about this problem. Thank you!
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Old 06-24-2019, 09:45 PM   #2
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The only KDP, I dealt with in 14 years at a Dodge dealership , was 18 years ago and Cummins wouldn't get involved then because the engine was 2 years out of warranty .

Because the camshaft has to come out ( drive gear is heat shrunk onto the shaft ) to remove the broken cover the time involved gets huge.

Before you go any further , check the block ; you don't want to spend the $$$ if you also have the #53 block. You did say ISB, so I'm assuming 24 valve engine.
It might be time to look for a different engine.

http://www.drivingline.com/articles/...eries-cummins/
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Old 06-25-2019, 09:09 PM   #3
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Quote:
Originally Posted by Skip426 View Post
The only KDP, I dealt with in 14 years at a Dodge dealership , was 18 years ago and Cummins wouldn't get involved then because the engine was 2 years out of warranty .

Because the camshaft has to come out ( drive gear is heat shrunk onto the shaft ) to remove the broken cover the time involved gets huge.

Before you go any further , check the block ; you don't want to spend the $$$ if you also have the #53 block. You did say ISB, so I'm assuming 24 valve engine.
It might be time to look for a different engine.

www.drivingline.com/articles/5-fatal-flaws-of-the-b-series-cummins/
And that's the bottom line. If you decide to buy a used engine, make sure it already has the KDP fix performed. That is an indicator the previous owner cared about the engine.
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Old 06-25-2019, 10:09 PM   #4
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Is your motor the 5.9 cummins. I have never heard of the killer dowel pin before.
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Old 06-25-2019, 10:11 PM   #5
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Is your motor the 5.9 cummins. I have never heard of the killer dowel pin before.
Click on the link in post #2.
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Old 06-25-2019, 10:54 PM   #6
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thx Now more to worry about. lol
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Old 06-25-2019, 11:05 PM   #7
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I was well aware of the KDP issue with my 5.9. I eventually decided that mine wasn't one that would likely have the problem but I did keep a folder on how to get ahead of it so it wouldn't drop out. In 15 years, never got to drilling the hole in the cover and adding the pin.

Those engines really didn't seem to be designed for heavy duty use. Also watch out for oil in the antifreeze. Just a sheen. Means there's a leak between pressurized oil system and the water pump. I forget where now, just remember it's expensive to fix. Most mechanics told me to ignore it.
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Old 06-26-2019, 07:58 AM   #8
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Not designed for heavy duty use? The ungodly equipment and places i have seen these little engines used would say otherwise. If there is oil in the coolant I would suspect an oil cooler/ gasket issue. Just my two cents though.
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Old 06-26-2019, 08:36 AM   #9
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Not designed for heavy duty use? The ungodly equipment and places i have seen these little engines used would say otherwise. If there is oil in the coolant I would suspect an oil cooler/ gasket issue. Just my two cents though.
I should say that it was my OPINION that they weren't designed for heavy use. I found several issues with that engine like the KDP and the expensive oil leak into the coolant...most of them I don't remember anymore. I use to know all about that leak but I've forgotten now. I do remember it required lots of cash money to fix.
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Old 06-26-2019, 04:19 PM   #10
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I'm sorry you have problems. The little Cummins ISB was originally designed by both Case and Cummins as a tractor engine. Jack Roush engineering did the work to install it into a Dodge pickup and it has been a fantastic engine. There are millions of these engines out there in all different configurations. Most are trouble free and last quite a long time.

You are going to have to do some homework to get this repaired without spending the bank.

I would first price the cost of a used Cummins 5.9 engine and the labor to install it.
I would then price out the replacement parts required to repair your engine and the labor to install them. Do the parts search yourself and look at every source possible.

I would not use a Cummins dealer as their parts and labor rates are going to be double that of a private shop. Try to find a small independent shop that will agree to work on a motor home.
Best of luck!
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Old 06-26-2019, 07:41 PM   #11
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This is a complete engine out of an 03 Bounder RV. This one only has 31k miles on it before the coach interior caught fire.
https://www.ebay.com/itm/USED-CUMMIN...YAAOSwtcNc~pzE

Another complete engine very reasonable. 1998 model. However, I would worry this one could potentially have a dowel pin issue in the future.
https://www.ebay.com/itm/1998-Cummin...YAAOSwRXhc0Z5q

This is a remanufactured engine with a 2 year unlimited mileage warranty.
https://www.ebay.com/itm/CUMMINS-5-9...EAAOSwC-xavO9V
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Old 06-26-2019, 10:48 PM   #12
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Originally Posted by Jim_HiTek View Post
I should say that it was my OPINION that they weren't designed for heavy use. I found several issues with that engine like the KDP and the expensive oil leak into the coolant...most of them I don't remember anymore. I use to know all about that leak but I've forgotten now. I do remember it required lots of cash money to fix.
I once owned a 1996 Dodge CTD 5.9, never had any problems with it, but then it only had 141,xxx miles on it when traded in for a new pickup.
The Cummins ISB is the only medium-duty rated diesel engine ever used as OEM in pickups. It is also OEM in many medium duty trucks.
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Old 06-28-2019, 07:15 AM   #13
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I dont beleive the ISB is the only medium duty engine used in a pickup. The 6.9 Navistar was used in plenty of medium duty applications and was used in Ford pickups.
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Old 06-28-2019, 08:48 PM   #14
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I dont beleive the ISB is the only medium duty engine used in a pickup. The 6.9 Navistar was used in plenty of medium duty applications and was used in Ford pickups.
Off-topic, but I did bring it up.

The 6.9 and 7.3 was a light-duty engine developed for Ford. I had a 1987 3/4T Ford, doggy diesel engine.

Only the 7.3 was used in medium-duty trucks.
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