Profile Picture

Cummins Single Disc Pump Disks

Posted By Randy Sallay Last Year
You don't have permission to rate!
Author
Message
Randy Sallay
Posted Last Year
View Quick Profile
First Gear

First Gear (35 reputation)First Gear (35 reputation)First Gear (35 reputation)First Gear (35 reputation)First Gear (35 reputation)First Gear (35 reputation)First Gear (35 reputation)First Gear (35 reputation)First Gear (35 reputation)

Group: Forum Members
Last Active: 7 days ago
Posts: 23, Visits: 621
Steve,
How about just remanufacturing existing discs and covers?
Randy.
dieselsteveo
Posted Last Year
View Quick Profile
Third Gear

Third Gear (372 reputation)Third Gear (372 reputation)Third Gear (372 reputation)Third Gear (372 reputation)Third Gear (372 reputation)Third Gear (372 reputation)Third Gear (372 reputation)Third Gear (372 reputation)Third Gear (372 reputation)

Group: Forum Members
Last Active: Yesterday
Posts: 284, Visits: 3.6K
Aaron (10/22/2020)
Steve, what would it take to make new discs for those pumps.




Money :)

But other than that, we’d have to:
- reverse engineer a disc to make a print, which would be easy.
-manufacture the disc: also pretty easy with our modern CNC machines
-figure out how to machine it to flatness tolerances to generate a seal: probably a bit challenging
-figure out if there is a way to machine/recon old distributor caps to mate with new discs, or be forced to make new caps...which would be hard as they’re cast
Aaron
Posted Last Year
View Quick Profile
13th direct

13th direct (4.0K reputation)13th direct (4.0K reputation)13th direct (4.0K reputation)13th direct (4.0K reputation)13th direct (4.0K reputation)13th direct (4.0K reputation)13th direct (4.0K reputation)13th direct (4.0K reputation)13th direct (4.0K reputation)

Group: Forum Members
Last Active: 2 hours ago
Posts: 3.4K, Visits: 10.8K
Steve, what would it take to make new discs for those pumps.


Driving the greenies nuts
http://www.killcarb.com/
dieselsteveo
Posted Last Year
View Quick Profile
Third Gear

Third Gear (372 reputation)Third Gear (372 reputation)Third Gear (372 reputation)Third Gear (372 reputation)Third Gear (372 reputation)Third Gear (372 reputation)Third Gear (372 reputation)Third Gear (372 reputation)Third Gear (372 reputation)

Group: Forum Members
Last Active: Yesterday
Posts: 284, Visits: 3.6K
Tony Bullard (10/20/2020)

The new radius is so the sharp edge wouldn't score the OD bushing as the disk is removed.





Seems legit. Radius on the edge of the disc would not help with lubrication. All disc lube comes from the fuel supply and I can’t see how the disc would care if it had a small radius on the edge or not.

Reducing risk if bushing scratch seems like most likely benefit.

I can’t say I’ve seen a disc with a radius on its edge, nor do I have any good documentation on all the SD changes. The SD pump I have in my garage right now has sharp edges, but just 1 data point

Tony Bullard
Posted Last Year
View Quick Profile
13th direct

13th direct (4.1K reputation)13th direct (4.1K reputation)13th direct (4.1K reputation)13th direct (4.1K reputation)13th direct (4.1K reputation)13th direct (4.1K reputation)13th direct (4.1K reputation)13th direct (4.1K reputation)13th direct (4.1K reputation)

Group: Administrators
Last Active: 3 hours ago
Posts: 3.6K, Visits: 16.8K
Randy Sallay (10/20/2020)
I've had a few of these Cummins Single Disc Pumps partially disassembled, mainly to inspect the distributor discs. Most of them had some scoring, but one I got a couple years ago was in very good shape, with a mirror like finish. Most of the discs had sharply defined square edge around the upper circumference. But this last one had a radiused edge around the upper circumference
Could this be a remanufactured disc, with perhaps a product improvement added?
Could this radiused edge be an improvement for lubrication of the disc against its bushing?
Anyone see this before?
Steve?

Randy Sallay

The new radius is so the sharp edge wouldn't score the OD bushing as the disk is removed.



Tony
Tony Bullard
Posted Last Year
View Quick Profile
13th direct

13th direct (4.1K reputation)13th direct (4.1K reputation)13th direct (4.1K reputation)13th direct (4.1K reputation)13th direct (4.1K reputation)13th direct (4.1K reputation)13th direct (4.1K reputation)13th direct (4.1K reputation)13th direct (4.1K reputation)

Group: Administrators
Last Active: 3 hours ago
Posts: 3.6K, Visits: 16.8K
I'm guessing it's just a radius on the blank before it was ground and lapped.

http://forums.justoldtrucks.com/uploads/images/476dadc9-1810-4981-9737-59e3.jpg

You could send them to a good machine shop to get them cleaned up. 



Tony
Randy Sallay
Question Posted Last Year
View Quick Profile
First Gear

First Gear (35 reputation)First Gear (35 reputation)First Gear (35 reputation)First Gear (35 reputation)First Gear (35 reputation)First Gear (35 reputation)First Gear (35 reputation)First Gear (35 reputation)First Gear (35 reputation)

Group: Forum Members
Last Active: 7 days ago
Posts: 23, Visits: 621
I've had a few of these Cummins Single Disc Pumps partially disassembled, mainly to inspect the distributor discs. Most of them had some scoring, but one I got a couple years ago was in very good shape, with a mirror like finish. Most of the discs had sharply defined square edge around the upper circumference. But this last one had a radiused edge around the upper circumference. 
Could this be a remanufactured disc, with perhaps a product improvement added?
Could this radiused edge be an improvement for lubrication of the disc against its bushing?
Anyone see this before?
Steve?

Randy Sallay


Similar Topics