BillD
Admiral
- Joined
- Sep 1, 2011
- Posts
- 8,138
- Likes
- 3,890
- Boat Make
- 27 H&H with Cummins QSB 5.9 480 power
I finished servicing the after coolers on my Cummins 370s.
Decided I wanted to "pressure test" the units after I took them apart, cleaned the cores,caps and housings.
How to do?? How to do ????
I picked up a "used" inner tube at my local tire dealer and a couple of clamps.
Cut the valve and a piece of rubber out of the tube and clamp blocked the ends.
I plugged the zinc threads and "aired it up"
1st try....a couple of leaks around the rubber pieces.
2nd try....and this is funny.....a "blowout" ! LOL too much pressure. Scared the crap out of me....sounded like a gunshot in my garage !!!!
3rd try......an assembled after cooler that "holds air" and should NOT leak!
FWIW,
Bill D.
btw, cost for pressure testing parts..........under $5 bucks

Decided I wanted to "pressure test" the units after I took them apart, cleaned the cores,caps and housings.
How to do?? How to do ????
I picked up a "used" inner tube at my local tire dealer and a couple of clamps.
Cut the valve and a piece of rubber out of the tube and clamp blocked the ends.
I plugged the zinc threads and "aired it up"
1st try....a couple of leaks around the rubber pieces.
2nd try....and this is funny.....a "blowout" ! LOL too much pressure. Scared the crap out of me....sounded like a gunshot in my garage !!!!
3rd try......an assembled after cooler that "holds air" and should NOT leak!
FWIW,
Bill D.
btw, cost for pressure testing parts..........under $5 bucks



