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Agfours
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Re-Torquing Heads after Rebuild
I know I'm asking permission here for a shortcut, which is not recommended, but I'll make my question either way to gauge the response on seriousness of my actions...
![]() Last week I opened up the valve covers to do a valve adjust. There was a top end done about 10k miles ago, and this was overdue as a second valve adjust (did one at ~1k, but got clicky again soon thereafter). There was a bit of an oil leak from the 1-3 cyl bank, and so I decided to check the head stud torque specs... sure enough the nuts/studs were about 5-10lbs shy of 23.5lbs specification. The 4-6 bank were all in spec. Now, for the shortcut...I didn't remove the rockers to get to studs/nuts #1-8 in the head diagram for torquing order (as specified in Bruce Anderson's rebuild book), but went ahead with retorquing studs #9-18 in order and pattern recommended. This means that the outside nuts/studs are in spec but the inside 8 could be undertorqued...but the perimeter nuts/studs are tight. Will this be problematic? Any experience on this approach?
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Paul Present and accounted for: 1986 Carrera Coupe, 2021 Audi SQ8...Gone but not forgotten: 1987 Carrera Coupe, 1996 911 Carrera C4S, 1985 911 Carrera Cabriolet M491, 2011 Cayenne Turbo, 2001 Boxster S....Me: "What is your return policy?" FLAPS rep: "We really expect you to keep it..." |
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Registered
Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,502
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Are you torquing the head nuts (10mm) Allen or the cam carrier 8 mm nuts?
Bruce |
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Agfours
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The head nuts (10mm) and Allen bolt heads - of which there are 18 total as specified in the cross torquing pattern for the heads.
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Paul Present and accounted for: 1986 Carrera Coupe, 2021 Audi SQ8...Gone but not forgotten: 1987 Carrera Coupe, 1996 911 Carrera C4S, 1985 911 Carrera Cabriolet M491, 2011 Cayenne Turbo, 2001 Boxster S....Me: "What is your return policy?" FLAPS rep: "We really expect you to keep it..." |
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Registered
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Agfours
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Er, um. Yes. The cam carrier bolts...just went back and looked again at the diagram with caption, and I evidently misread what I was tightening...so I actually just retorqued the cam carrier bolts.
![]() ![]() Question remains, if the cam carriers are not retorqued with the inner nuts but only those accessable with the rockers in place, am I looking at issues...i suppose less serious given these are not head studs ![]()
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Paul Present and accounted for: 1986 Carrera Coupe, 2021 Audi SQ8...Gone but not forgotten: 1987 Carrera Coupe, 1996 911 Carrera C4S, 1985 911 Carrera Cabriolet M491, 2011 Cayenne Turbo, 2001 Boxster S....Me: "What is your return policy?" FLAPS rep: "We really expect you to keep it..." |
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Join Date: Mar 2000
Location: Colleyville, TX
Posts: 129
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Well, the torque spec for those is 18 ft-lb so they were ok to start with and you over tightened the ones you could reach. I'd just leave it alone at this point.
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Registered
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I actually might be inclined to fix it. ..you want the cam to run true in the center of that thing. I wouldn't want a mix match of torque throughout. Could be over kill but the last top end I did we followed Waynes book using lock tite under the cylinders. The loctite set unevenly and the cam locker up tighter than a drum when we bolted the carrier down....so they are somewhat sensitive to variation. I'm not a pro builder like others on the board, so it's good to solicit other opinions.
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Registered
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I actually might be inclined to fix it. ..you want the cam to run true in the center of that thing. I wouldn't want a mix match of torque throughout. Could be over kill but the last top end I did we followed Waynes book using lock tite under the cylinders. The loctite set unevenly and the cam locked up tighter than a drum when we bolted the carrier down....so they are somewhat sensitive to variation. I'm not a pro builder like others on the board, so it's good to solicit other opinions.
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