110 head torquing issue
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Cruiser
Joined: Oct 2010
Posts: 118
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110 head torquing issue
Rebuilding an 07 cvo RK and I'm at installing heads with Cometic gaskets. Been through the sequences and I'm at the 42 ftlb final round. After completing that I'm going around in sequence and checking them till nothing moves. All good but right hand side on the rear head. Torque rear one then front on and they both move. Back to rear and it moves and then the front again,some thing. What gives?
Tourer
Joined: Feb 2015
Posts: 268
Likes: 36
From: Athens Greece
1) did you check the studs were tight before reassembly? maybe youre tightening the studs along with the head bolts..
2) is the gasket in correctly? maybe youre crushing the brass rivet??
3) is the head sitting correctly?
4) did you use antisieze? that will change the torque value alot
thread locker does too but almost nothing
FYI, i found the best way to seat an MLS is to let it sit for 10-15 mins between the final 2 stages of torqueing.. i came across this by accident letting the bike sit over night disassembled, i double checked torque next day before reassembly and they lost an average 2 lbs, some none, some 3, one lost 4lbs
2) is the gasket in correctly? maybe youre crushing the brass rivet??
3) is the head sitting correctly?
4) did you use antisieze? that will change the torque value alot
thread locker does too but almost nothing
FYI, i found the best way to seat an MLS is to let it sit for 10-15 mins between the final 2 stages of torqueing.. i came across this by accident letting the bike sit over night disassembled, i double checked torque next day before reassembly and they lost an average 2 lbs, some none, some 3, one lost 4lbs
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Cruiser
Joined: Oct 2010
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Everything checks out. In place proper,tight,rivets have clearance. Followed manual and used oil on underside of bolt flange and on threads. On further inspection,the one bolt isn't actually torquing more each time,it's flexing. I think I've got a bolt that isn't seating on the head properly. Guess the head is coming back off.
Grand HDF Member
Joined: Sep 2017
Posts: 4,359
Likes: 1,219
From: Dubuque, IA
Light coat of oil. Very light. Too much oil on the threads will give ya a wet torque.
Also, using mls gaskets you don't use orings. You didn't by chance leave one stuck in the head?
Just throwing that out there.
Also, using mls gaskets you don't use orings. You didn't by chance leave one stuck in the head?
Just throwing that out there.
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Cruiser
Joined: Oct 2010
Posts: 118
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I don't think I used to much oil but I'm gonna clean everything up and give it another try this evening.it seems like the front bolt is bottoming out before it fully seats on the head,but the stud doesn't seem to be sticking up any higher than the rest. Can a guy clean up the threads on the bolt with a tap?maybe there's some gunk up in there?
Tourer
Joined: Feb 2015
Posts: 268
Likes: 36
From: Athens Greece
use a wire brush to clean them, dont chase them, you might cut into the walls of the thread and weaken the thread, the OEM threadlocker, dirt, etc etc might provide enough resisitance to push the thread cutter into the threads them selves and cut into them
Last edited by ghost183; Feb 25, 2020 at 02:25 PM.
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