To qualify this, I haven't rebuilt a PCP or air pump in probably 5 years. Being an old guy, I forget stuff.
My Crosman air pump has be needing a repack for some time. Since my scuba tank was down to 2000PSI, I decided to use the pump to bring it up to 3000. Well, the Forster fittlng was sticking a little so I sprayed it with Silicone Spray which has not cause any issues in the past. This time, I forgot to wait for the carrier to evaporate before I started pumping.
I started pumping vigorously as I do until the pump pressure equalizes with the gun pressure. Just about the time that happened, I heard a pop and the pump stroke felt odd.
I reached down to disconnect the Foster fitting and it was hot. I felt the gun reservoir and it was hot and the pressure gauge was pegged.
I quickly starting cocking and shooting until the reservoir was empty. The first shot told me the gauge was lying as the valve wasn't locked. I proceeded to dump the reservoir and the gauge never moved.
After disassembling the pump, I saw what happened. The silicone spray carrier detonated and the flame path ran through the whole system as well as the gun. I just finished cleaning all the black carbon crap out of the pump and didn't see any damage. I am about to start on the Prod and expect the same it it.
I just wanted to get this out there so folks know that dieseling is not an old wives tale and it can happen to anyone, even those who are supposed to know better.
My Crosman air pump has be needing a repack for some time. Since my scuba tank was down to 2000PSI, I decided to use the pump to bring it up to 3000. Well, the Forster fittlng was sticking a little so I sprayed it with Silicone Spray which has not cause any issues in the past. This time, I forgot to wait for the carrier to evaporate before I started pumping.
I started pumping vigorously as I do until the pump pressure equalizes with the gun pressure. Just about the time that happened, I heard a pop and the pump stroke felt odd.
I reached down to disconnect the Foster fitting and it was hot. I felt the gun reservoir and it was hot and the pressure gauge was pegged.
I quickly starting cocking and shooting until the reservoir was empty. The first shot told me the gauge was lying as the valve wasn't locked. I proceeded to dump the reservoir and the gauge never moved.
After disassembling the pump, I saw what happened. The silicone spray carrier detonated and the flame path ran through the whole system as well as the gun. I just finished cleaning all the black carbon crap out of the pump and didn't see any damage. I am about to start on the Prod and expect the same it it.
I just wanted to get this out there so folks know that dieseling is not an old wives tale and it can happen to anyone, even those who are supposed to know better.