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AC Compressor head bolt torque

conolo on Mon September 15, 2008 1:30 PM User is offline

Year: 1991
Make: Volvo
Model: 740
Refrigerant Type: 134A
Pressure Low: 40
Pressure High: 175
Country of Origin: United States

I installed a gasket and o-ring kit on my Diesel-Kiki model DKS 15BH compressor. The goal was to stop a leak at the o-ring on the port end. I torqued the six head bolts to 25 foot-pounds. Within about a day I saw the green glow at the port end head o-ring, using my UV light . It's leaving a small puddle of lubricant on my garage floor as well.

Would anyone know the correct torque to use on the head bolts?

Here in the northeast U.S. we use salt on our roads to melt the ice and snow. My guess is the aluminum sealing surfaces have been corroded with pits by the salt. The pits were big enough to notice when I had the compressor apart. I'm thinking it's to the point where a reasonable torque just won't seal the thing.

Thanks in advance for your help.

bohica2xo on Mon September 15, 2008 2:21 PM User is offline

An O ring will not seal visible pits.

A new compressor from this site's sponsor is about 240 bucks. AC Kits Volvo 740 Compressors


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