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#1
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OT, air compressor head bolt tq ?
I have a Craftsman 5 HP twin cylinder air compressor. It is all aluminum. It blew the head gasket so I bought 2 new ones. Anyone know the tq specs on something like that ? I bet I could get by with "feel" but if I can get the actual number I would appreciate it.
Thanks for any help. |
#2
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I couldn’t find the specs when I put a new gasket on mine either. I just kind of snugged em. Well the gasket blew out again a few months later, Argh! So I snugged them then let it run and cool down for a few cycles and found them to be pretty loose again. So I resnugged them. That did the trick as they haven’t given me a problem since.
Sorry , I know “snug” isn’t too helpful though!
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71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. ‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears. |
#3
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You can go by feel. Also it's a good idea to snug them up every so often.
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#4
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I found a parts lists for a Craftsman 106-175180 5 HP compressor. The scanned drawings were not very clear, but it looks like the head bolts are 3/8-16 (UNC). Standard torque for a grade 5 bolt of that spec would be 23-25 ft/lbs. Might be a place to start.
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Fort Worth/Dallas TX area 1966 GTO Fontaine Blue 389 CID Carter AFB Muncie 4 speed (orginally an automatic car) |
#5
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I'd suggest the german torque spec: gutentight
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************************************* 1968 Lemans. 37,000 original miles. GTO clone. 462ci/KRE 290 heads. UltraDyne 280/288 Solid/850 Qjet by Cliff/Performer RPM/TSP 9.5" in TH400/8.5" 3.42 gears/3950# Race weight/12.58@106 at Bandimere speedway high altitude |
#6
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I agree with head bolt torque at 25-30 ft-lbs (multiply by 12 to get in lbs). And also agree you must go back and re-check this after running a few cycles hot/cold after replacement. Or you can just say "click" out loud after tightening each bolt snuggly and let her buck.
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#7
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Quote:
"I" would drop the torque by ~20%, and coat the threads with antiseize, and the underside of the bolt heads with moly-based lube. Yes, retorque after heat cycling. |
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