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Hard To Find Leak

Gerald K4NHN on Mon October 31, 2011 7:50 PM User is offlineView users profile

Year: 1986
Make: Isuzu
Model: Trooper II
Engine Size: 2.2
Refrigerant Type: R-12

I've been working, restoring some front end damage and also other Diesel work on a Trooper II that I picked up last year. While I was dong the diesel work I had replaced the condenser because of the wreck damage. It took me four condensers to finally get one that was good. I would have purchased a new one but Isuzu doesn't support these any longer and I couldn't find a direct drop in so a used one was what I had to go with. I had pulled a good vacuum and replaced the drier while I was doing the diesel work and it help for several weeks while I did the other work. When I was finished, I opened the fill plug on the compressor, SD-508, I think that was the compressor number, without running next door to check on it, add the oil, put an elbow on the service port of the drier because of where it is located right next to the fender edge. I noticed that the vacuum didn't want to hold. So I put in a couple of oz and started to sniff and put the bubble test to work. I found that there was a leak in one of the rubber hoses fittings so I had a new one made up and thought I'd be on my way to putting the Trooper back on the road, but not yet. I've gone over the joints of the new hose, the elbow and the fill plug with the sniffer and the Big Blue bubble stuff and I can't find the leak The vacuum looks good for about 4 hours and then it'll take about 3 to 4 day to make it back to 0... It seems that maybe it started after I put the oil in and then rotated the compressor with a wrench about a dozen times. It held for several weeks and now I have this leak. I guess I'll have to find me a shower cap and try and put it over the front of the compressor. Sniffing at the water drain and the vents don't show anything... Anyone have more suggestions at what to look at.

Gerald K4NHN
Cayce, SC

emsvitil on Mon October 31, 2011 9:06 PM User is offlineView users profile

Dye in the oil with a UV lamp will help.


Gerald K4NHN on Mon October 31, 2011 11:33 PM User is offlineView users profile

I've put dye in with the oil, I was hopeing to find the leak before I had to put a lot of R-12 in it, but may have to.

Dougflas on Sat November 05, 2011 6:36 PM User is offline

Some leaks won't show up under a vacuum. Try pressurizing the system. You can use R134 for testing in order to save prrcious r12.

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