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Old 02-17-2019, 09:28 PM   #1
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1994 5.9 dowel pin

I have a 1994 Dynasty, with 170,000 miles on it. I bought it new. It has the 5.9 ,with the 3060 six speed Allison. I have heard that the dowel pin is a problem, for this motor. I am now 84 and I sure don't want to worry about this potential problems. Any advice would be appreciated. Larry
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Old 02-17-2019, 10:11 PM   #2
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Yes, it is a potential problem. You can go to this site and read the thread: https://www.dieselbombers.com/94-98-...l-pin-fix.html It is a problem for all the 5.9 Cummins engines through 2002. I have done the fix to my coach, but do not recommend the fix as something to do in a home shop. The flywheel, pulleys, and entire valve gear case cover has to be removed to reach the steel pin(s). You also do not need to purchase the kit to make the repair, the existing pins (yes, there are more than one) that align the timing gear case to the engine block can be driven back in place and the holes peened to hold them. On your Dynasty you do not have a radiator blocking access, so I would expect a diesel repair shop could do the job rather economically.
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Old 02-17-2019, 10:13 PM   #3
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Quote:
Originally Posted by lmcintosh View Post
I have a 1994 Dynasty, with 170,000 miles on it. I bought it new. It has the 5.9 ,with the 3060 six speed Allison. I have heard that the dowel pin is a problem, for this motor. I am now 84 and I sure don't want to worry about this potential problems. Any advice would be appreciated. Larry

Here is info about the 'Killer Dowel Pin' (KDP) from Cummins and how to eliminate the potential damage
5.9L 12v Cummins Killer Dowel Pin (KDP) Information


ANY competent mechanic can do the install of the kit.
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Old 02-17-2019, 10:19 PM   #4
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Old 02-18-2019, 07:43 AM   #5
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If it's a 1994 and still running good, it's not something I would worry too much about. Just relax and enjoy it.
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Old 02-18-2019, 09:50 AM   #6
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Thank you for info. I think it should be alright, can't worry about it. Does it matter how many miles on engine if it fails? I guess as you age you think about things going wrong. RV always in heated shop, and maintained by the book. Thanks again Larry
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Old 02-18-2019, 08:45 PM   #7
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Decent vid on this including flat tab vs stairstep (in comments)






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Old 02-18-2019, 09:29 PM   #8
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Since i had head off my motor i decided to check it for the KDP and was surprised to find it working its way out at 65k miles. Its a 1998.5 24 valve ISB. Ive heard Cummins changed the block design in later models deleting the pin but I donít know when.

Heres a pic i took of it. I bought the kit from genosgarage which worked great and also stopped the front seal from leaking with the new seal provided. Pin is in lower right of pic.
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Old 02-19-2019, 10:02 AM   #9
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The issue with those pins is the different rate of expansion and contraction between the iron engine block and the aluminum timing gear cover. It simply works the pins out, and the top one (known as the killer) drops into the timing gears and usually results in destroying the case and a couple of gears. The aluminum cases on the engines manufactured after 2002 have a ridge in those holes to keep the pin from floating out and dropping. When you open one of these up and find the pin sticking out, you are right at the point of impending failure. The bolts that hold the case to the block will be loose too, also from differing expansion rates. Remove those, clean them and the threaded holes, then use blue LocTite to reinstall the bolts.
On a coach with a side radiator it is much easier and far less expensive to make the fix than on a rear radiator coach.
Because your Dynasty is one of the very good coaches out there, I would spend the few bucks now to prevent a catastrophic failure down the road. Any competent diesel mechanic can make the repair.
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Old 02-19-2019, 11:16 AM   #10
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I also blue loctited all the bolts as well. All were tight before.
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