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Cylinder pillar bolts torque setting #703753
08/03/17 1:12 am
08/03/17 1:12 am
Joined: Jun 2017
Posts: 26
Ireland
T
T120Wicklow Offline OP
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T120Wicklow  Offline OP
BritBike Forum member
T

Joined: Jun 2017
Posts: 26
Ireland
Hi guys, I'm new to the Britbike forum but have been lurking for a while.

I have a friend's T160 with the head off to replace a blown composite head gasket. I am aware that the pillar bolts can sometimes strip the threads in the rather soft alloy factory cylinder, thus allowing the head to lift and causing head gasket failure, but it appears that the pillar bolts are all tight in their threads. I know this engine was built very well and has survived 11 years until this gasket failure happened. However, I want to make sure that the pillar bolts are tightened to the correct torque so they don't undo when the head bolts come off at some stage in the future. I also don't want to over-tighten them.

I don't yet have a 7/16" socket bolt extractor to check the torque of the pillar bolts, but looking at the factory manual, I can't see any reference to torque settings for these pillar bolts. I see the figure of 18 lb/ft for the cylinder head bolts, but not the pillar bolts. Am I missing something? Can someone suggest a practical torque setting that works from their own engine-building experience with triples?

By the way, I have checked the cylinder head face and it is absolutely flat. And I will be using a copper head gasket.

Dave

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Re: Cylinder pillar bolts torque setting [Re: T120Wicklow] #703760
08/03/17 2:44 am
08/03/17 2:44 am
Joined: Jan 2004
Posts: 3,902
ca, us
D
DMadigan Offline
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DMadigan  Offline
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D

Joined: Jan 2004
Posts: 3,902
ca, us
The pillar bolts are not torqued. Just turn them in until the underside of the socket meets the cylinder. Torquing them will pre-stress the threads in addition to the head bolt load. Probably one reason the cylinder threads strip with the proper head torque.

Re: Cylinder pillar bolts torque setting [Re: T120Wicklow] #703761
08/03/17 3:30 am
08/03/17 3:30 am
Joined: Mar 2014
Posts: 636
Denver CO
J
Jerry Roy Offline
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Jerry Roy  Offline
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J

Joined: Mar 2014
Posts: 636
Denver CO
Be sure to anneal the copper gasket. JR

Re: Cylinder pillar bolts torque setting [Re: T120Wicklow] #703787
08/03/17 10:46 am
08/03/17 10:46 am
Joined: Jun 2017
Posts: 26
Ireland
T
T120Wicklow Offline OP
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T120Wicklow  Offline OP
BritBike Forum member
T

Joined: Jun 2017
Posts: 26
Ireland
OK guys, thank you for those wise words!

Re: Cylinder pillar bolts torque setting [Re: T120Wicklow] #703915
08/04/17 12:51 pm
08/04/17 12:51 pm
Joined: Sep 2001
Posts: 666
Great Southern Land
tridentt150v Offline
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tridentt150v  Offline
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Joined: Sep 2001
Posts: 666
Great Southern Land
I just do up tight/firm but not gorilla style. I also use Loctite, the green stuff Super strong and for heated area. Can get the number tomorrow if needed. Last time I used this stuff [on advice from a well respected Triple engine builder] I made up a paste of the green stuff and iron filings and used that. The idea is to lock them in permanently...never want them to move or come out. So far, so good!!!

Re: Cylinder pillar bolts torque setting [Re: tridentt150v] #704006
08/05/17 12:45 am
08/05/17 12:45 am
Joined: Jun 2017
Posts: 26
Ireland
T
T120Wicklow Offline OP
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T120Wicklow  Offline OP
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T

Joined: Jun 2017
Posts: 26
Ireland
tridentT150v - Ah, now that's interesting. Apologies for the late reply - I have been busy over the last few days and have only now read your post. Yes, if you could get the code, that would be very handy, thank you!

Last edited by T120Wicklow; 08/05/17 1:05 am.
Re: Cylinder pillar bolts torque setting [Re: T120Wicklow] #704011
08/05/17 2:32 am
08/05/17 2:32 am
Joined: Sep 2001
Posts: 666
Great Southern Land
tridentt150v Offline
BritBike Forum member
tridentt150v  Offline
BritBike Forum member

Joined: Sep 2001
Posts: 666
Great Southern Land
Number is 620.

Re: Cylinder pillar bolts torque setting [Re: tridentt150v] #704088
08/06/17 2:29 am
08/06/17 2:29 am
Joined: Jun 2017
Posts: 26
Ireland
T
T120Wicklow Offline OP
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T120Wicklow  Offline OP
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T

Joined: Jun 2017
Posts: 26
Ireland
Excellent, thank you T150v!



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