Cummins air compressor


For you lovers of the Class 8's and bigger.

Golden Jubilee
Golden Jubilee

Posts: 4408

Joined: Thu Nov 29, 2012 9:28 pm

Location: Lyman, IA

Post Thu Jun 21, 2018 2:05 pm

Re: Cummins air compressor

Pulled the damaged steps off. couldn't get the cab, up do to broken fittings on the lift cyl, Pulled to bumper and replaced temp with brass, as steel were not available. Come to find the radiator is leaking, likely a crack tube to header joint cause by the impact.
Now to see if I can get any money from the car's insurance.

Golden Jubilee
Golden Jubilee

Posts: 4408

Joined: Thu Nov 29, 2012 9:28 pm

Location: Lyman, IA

Post Mon Jul 23, 2018 10:13 am

Re: Cummins air compressor

Got the truck in for an estimate, now its a waiting game with insurance companies fighting it out.

Golden Jubilee
Golden Jubilee

Posts: 4408

Joined: Thu Nov 29, 2012 9:28 pm

Location: Lyman, IA

Post Sat May 04, 2019 2:44 pm

Re: Cummins air compressor

Brought it home from the body shop today, not done, but all the body/paint stuff that I can't do it finished. Needs a lower grill, turn signal, 3 tires and a windshield.
Still not sure on the radiator, but it is not leaking bad enough to worry about it for now.
After paying the body shop I have funds left over from the settlement to finish it without getting hurt.
It has been started may be 3 times in the 8 months it was down there, Fired right off. Says alot for the super capacitor.
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Yard Art
Yard Art

Posts: 61

Joined: Wed Nov 28, 2018 4:10 pm

Location: Bay Area, California

Post Sat May 04, 2019 3:20 pm

Re: Cummins air compressor

Glad to hear this is coming back together!
1936 International C40
2002 Chevy Avalanche
1962 Triumph TR4

Golden Jubilee
Golden Jubilee

Posts: 4408

Joined: Thu Nov 29, 2012 9:28 pm

Location: Lyman, IA

Post Wed Apr 01, 2020 9:30 am

Re: Cummins air compressor

Yesterday I modified the Delco 26 SI alternator. It is almost identical to the 25SI I did for the '89 so I didn't take more pictures, the difference is 26SI takes the little white "triangle" regulator instead of the circuit board regulator. The 26SI regulator is not adjustable, however so is not my 1st choice.
Both the 25 and 26 are semi-sealed, the two coils (field and stator) have air drawn over them by the fan but the rest of the electronics are in a gasketed and sealed area. To retain this property the case is drilled and nylon "stand off" insulators are installed in the holes with fiber washers to insulate the stud from the case. The field connection are in this way brought external to the case. The original regulator is left inplace and connected. In the 25SI I set the internal reg to 13.8 volts or about the "float charge voltage" on the 3 step "marine" regulator. This provides a failsafe if one or the other regulator fails, and also splits the field current between two regulators. It one of the recommendations the makes of the 'Marine" regulator recommends. I tried controlling with just their reg but had problems with it shutting down. Since running both I have not had a problem.
I also had to change out the pulley. It had worn to the point the belts were riding on the base of the groove and would slip. The "gray ghost" is living up to its name, outlasting several inframes and over 30 years.
Here are some pictures of the 25SI conversion.
Attachments
Delco 25si.jpg
Delco 25si 2.jpg

Golden Jubilee
Golden Jubilee

Posts: 4408

Joined: Thu Nov 29, 2012 9:28 pm

Location: Lyman, IA

Post Tue Apr 21, 2020 5:46 pm

Re: Cummins air compressor

Finely got the Marine regulator hooked up. I have been waiting for the Weatherpak connectors. The place sent the wrong ones, and is sending more, but it is take 10 days for the US mail to get a package from Pontiac, MI to western Iowa!
I am still waiting! So I hard wired it in and will have to cut and put the Weatherpak's in when they get here. That way I can make a harness on all my Delco Gray ghost alternators, and make it so any of them will interchange with any other, and just require the output, ground wires and then plug the harness.
If the marine reg goes out I can unplug it and the internal reg will keep the battery charged, just not as fast. If the internal reg quits the marine reg should continue to work.
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