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Monaro202, I still think the best direction to Torque anything is like Volvo (F7 Truck) state... Tension in sequence to the Second Stage and then + 1/4 or 5/16 of a turn extra for the final Torque. This Eliminates the magnified effects of thread Edited by user Monday, 18 September 2006 5:15:25 AM(UTC)
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666 |
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666.. this works fine for the later model bolts with torque controlled tension the threads on these bolts are rounded rather than sharp edged and are designed for that. they also should be replaced each time which is very nice little earner for the manufa
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JP,
We never used to replace any of the Bolts (unless visually sus), these Trucks weren't new models either (80's), althouugh they were always Volvo and Benz engines.
Thanks 4 checkin the Haynes, now it's just the procedure I need find to dis/prove th |
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If the bolts are the type where you do them to a certain torque, for instance 60n, and then tighten them a further 1/2 or 3/4 turn, rather then to a tension, they are the replacement type bolts. The idea is that the engineers have worked out exactly how f
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JP,
Thats the first time ive heard that reason, I thought instead of saying 80Nm the engineers had worked out (from the pitch on the thread) that by going to 60 Nm and then a further 1/2 a turn that this would = 80Nm.(regardless of Oil or Dry install) |
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Hi Guys.
These bolts are called 'Torque-to-Yield' bolts & are now very common on passenger car engines. Don't know about truck engines, but I would suspect the same. The bolts are 1 use only & must be replaced, but of course many don't.
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Dr T, I supose these days everything is becoming cheaper to make and more disposable, (even the cars themselves). Replacing them would also save time V labour(to clean) for mechanics now. Just know that youd think twice B4 replacing 42 of 22 x 180 bo Edited by user Tuesday, 19 September 2006 6:37:38 PM(UTC)
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Thanks terry I couldn't remember what they were called. The gasket catalogues have a writeup on these.
666 as for time saved cleaning a few bolts, how much time would it cost if you had put in 41 of them and then had to remove them because one had broke
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JP, If u broke a head bolt on an F7Volvo u only hafta take 1 of the 6 Heads off (7 Bolts in each). I think uv missed my point when I suggested "the best way to tension a bolt" is to calculate how far it should be tuned to reach a Torque from - lets sa Edited by user Friday, 22 September 2006 9:38:30 AM(UTC)
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666..that sort of argues against your idea of reusing the old bolts doesn't it?
Also I would think 250nm would not bother 22mm bolts anyway.
and we were talking about the torque to yield bolts which you are not using apparently.
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