Huh. This is interesting, iznit:
Attachment:
TSB_66DT-40s.jpg [ 231.57 KiB | Viewed 4751 times ]
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| Factory Advice on Exhaust Manifold Crack Avoidance https://www.slantsix.org/forum/viewtopic.php?t=64107 |
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| Author: | SlantSixDan [ Mon Sep 30, 2019 4:15 pm ] |
| Post subject: | Factory Advice on Exhaust Manifold Crack Avoidance |
Huh. This is interesting, iznit: Attachment: TSB_66DT-40s.jpg [ 231.57 KiB | Viewed 4751 times ] |
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| Author: | nuttyprof [ Mon Sep 30, 2019 4:27 pm ] |
| Post subject: | Re: Factory Advice on Exhaust Manifold Crack Avoidance |
good to know. |
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| Author: | Rick Covalt [ Mon Sep 30, 2019 5:10 pm ] |
| Post subject: | Re: Factory Advice on Exhaust Manifold Crack Avoidance |
Guess I might as well get my hammer out and break the little tab off now. It will save me time later breaking it off by accident! 
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| Author: | DadTruck [ Mon Sep 30, 2019 7:04 pm ] |
| Post subject: | Re: Factory Advice on Exhaust Manifold Crack Avoidance |
Having spent some time in resolving design defects that show up as field failures. Fixes like the one RH Kline bulletinized was really frowned upon in the organization that I worked in. His plan may reduce the likely hood of a second manifold cracking, but does nothing to prevent the crack on the initial manifold. The goal field service failure evaluation should be to prevent the first failure, not the second one. I am thinking that if RH Kline's resolution was actually effective Chrysler Engine Engineering would have changed the part print to have the notches in all slant six manifolds. I know that we were not allowed to change the part from the released print to resolve a customer issue. If the part needed to be changed to resolve the issue, then the part print was changed, which put the change in all subsequent production. Chrysler in the 60's was probably a different animal. |
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| Author: | GregCon [ Mon Sep 30, 2019 7:21 pm ] |
| Post subject: | Re: Factory Advice on Exhaust Manifold Crack Avoidance |
Seems like that would negate the usefulness of the cone nut (or washer?) . |
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| Author: | MadScientistMatt [ Tue Oct 01, 2019 5:29 am ] |
| Post subject: | Re: Factory Advice on Exhaust Manifold Crack Avoidance |
Quote: Having spent some time in resolving design defects that show up as field failures.
This does raise the question of why subsequent revisions of the manifold don't have this change. Perhaps they had simply change the diameter of the holes instead of slotting them completely, or added some other change to the manifold, and this was an interim fix?
Fixes like the one RH Kline bulletinized was really frowned upon in the organization that I worked in. His plan may reduce the likely hood of a second manifold cracking, but does nothing to prevent the crack on the initial manifold. The goal field service failure evaluation should be to prevent the first failure, not the second one. I am thinking that if RH Kline's resolution was actually effective Chrysler Engine Engineering would have changed the part print to have the notches in all slant six manifolds. I know that we were not allowed to change the part from the released print to resolve a customer issue. If the part needed to be changed to resolve the issue, then the part print was changed, which put the change in all subsequent production. Chrysler in the 60's was probably a different animal. |
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| Author: | Greg Ondayko [ Tue Oct 01, 2019 8:21 am ] |
| Post subject: | Re: Factory Advice on Exhaust Manifold Crack Avoidance |
note how it came out as a truck depart. document. Cars must have been less susceptible to this issue when the motor was in the first 10 years of service. Greg |
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| Author: | Reed [ Tue Oct 01, 2019 1:40 pm ] |
| Post subject: | Re: Factory Advice on Exhaust Manifold Crack Avoidance |
Remember that Dodge was putting the slant six in industrial trucks up to the five ton rated models. Those sixes would have worked much harder than a Dart getting groceries. The benefit of the TSB would be preventative maintenance for owners still running an uncracked manifold. The notch could be ground or chipped out without removing the manifold (if one had the clearance and access) and notching the front and rear eyes is much easier than removing the whole manifold stack. |
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