KDP investigation...
03-18-2018, 04:28 PM
#32
Registered User
If you haven't did the kdp fix you are playing russian roulette with your engine. It's not that hard of a job to take the chance. That was one of the first things I did when I bought my truck 18 years ago.
03-18-2018, 07:23 PM
#33
Registered User
KDP problem can effect any 6bt engine from the 91.5 IC 1st gen ( not the non-IC 1st gen’s as they have a different gear cover with a blind dowel pin boos ) all the way through to around 24v 2000 year engines. Somewhere in the early 2000’s Cummins changed up the gear housing again to a dowel pin blind hole.
Reason it effects the p-pumped engines more than not is the harmonic’s of the p7100. The pump takes quite a bit of torque to just turn over, unlike a VE or VP which is easily turned by hand.
Reason it effects the p-pumped engines more than not is the harmonic’s of the p7100. The pump takes quite a bit of torque to just turn over, unlike a VE or VP which is easily turned by hand.
Edwin
03-18-2018, 08:40 PM
#34
Registered User
So far both the NON I/Ced motors I know have been opened up this week, have not had the "blind hole".
It is an interesting piece of info. that I will see how plays out with the more NON I/Ced motors I open up.
Since I run several NON I/Ced rigs that I have not checked the KDP on, I would love to believe it that 100% of all NON I/Ced rigs came like that. So far my research doesn't seem to make it look that way.
03-18-2018, 09:07 PM
#35
Registered User
Hmmmmm... Well now we have two sources I consider to be authoritative on the subject with different experience.
I'll have to eventually tear into it to see I guess.
I wonder why the variance? Is there any way to tell from the engine serial number?
I'll have to eventually tear into it to see I guess.
I wonder why the variance? Is there any way to tell from the engine serial number?
03-19-2018, 02:28 PM
#37
Registered User
The KDP was an issue for all 6BTs ranging from 89-02 and quite possibly years earlier than 89, but this is in regards to the trucks. The timing gear case and cover for 94-02 was a slightly different shape from what I understand also. Quite a bit of work is required just change the gear housing over. Tabbing over the hole or peening the case material around the hole works the same. The task is far less involved and takes far less time to perform.
03-20-2018, 10:55 AM
#38
I've personally "killed" the KDP (and had to tap back in) on all of my non I/C engines over the years. (1989, 1990, 1991.0)
03-21-2018, 09:39 AM
#39
Registered User
I would agree Mark really knows his Cummins stuff.
So far both the NON I/Ced motors I know have been opened up this week, have not had the "blind hole".
It is an interesting piece of info. that I will see how plays out with the more NON I/Ced motors I open up.
Since I run several NON I/Ced rigs that I have not checked the KDP on, I would love to believe it that 100% of all NON I/Ced rigs came like that. So far my research doesn't seem to make it look that way.
So far both the NON I/Ced motors I know have been opened up this week, have not had the "blind hole".
It is an interesting piece of info. that I will see how plays out with the more NON I/Ced motors I open up.
Since I run several NON I/Ced rigs that I have not checked the KDP on, I would love to believe it that 100% of all NON I/Ced rigs came like that. So far my research doesn't seem to make it look that way.
The "new improved" gear covers being sold now, are the same....with the machined step in cover.
The following 2 users liked this post by nascar mark:
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PapeCAT (03-22-2018)
03-22-2018, 10:44 AM
#40
Registered User
One of the KDPs from last week had worked itself out to flush with the front of the timing cover, so I am not sure about the machined step in.
Why if they knew about the problem of the KDP in '89-'91.0 and had a fix for it, did they stop making the step up in the later cases? I can not imagine that there is a cash savings in designing a new cover without the small step in the dowel pin hole.
Why if they knew about the problem of the KDP in '89-'91.0 and had a fix for it, did they stop making the step up in the later cases? I can not imagine that there is a cash savings in designing a new cover without the small step in the dowel pin hole.
03-22-2018, 11:33 AM
#41
Registered User
Cummins wasn’t aware of any KDP issues until late in the 90s and I hope you know Cummins sold these engines to Dodge with no warranties.
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mknittle (03-23-2018)
03-22-2018, 11:37 AM
#42
Registered User
I should have also added the dowel has a slight taper on both ends which allow it to be flush with the cover but not allowed it to come out any farther.
03-22-2018, 11:41 AM
#43
Registered User
Cool photos, thanks!
03-22-2018, 03:54 PM
#44
Registered User
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mknittle (03-23-2018)
03-23-2018, 08:13 AM
#45
Registered User
That tooling was available but kind of rare. I had a couple forming tools like that in the 1980s when I was programming Mazak mills.