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Clutch-Crankshaft Bolts (AAZ)
by
BP10000
on 09 Sep, 2009 10:50
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What is the proper torque for these? The 6 M12 bolts holding the pressure plate to the output flange on the crankshaft.
My haynes (I know...) manual says 44lb-ft +90deg, which seems like an awful lot. I read 22lb-ft in a post on this forum.
If it is the higher figure, should I be replacing the bolts?
I am transferring a used sachs clutch from my blown engine to my replacement one.
Also, would this clutch likely contain asbestos? I'm not blowing the dust around anyway, but it would be nice to know.
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#1
by
rallydiesel
on 09 Sep, 2009 10:57
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Those bolts always need to be replaced. All stretch bolts need to be replaced since they deform on the first use and weaken if stretched again. It's 22 ft lbs plus 90 degrees for the 1.6 so the AAZ would probably be the same. Also, they must have threadlock compound on them.
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#2
by
Turbinepowered
on 09 Sep, 2009 13:24
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According to the Mk3 Bentley I have, the tightening torque for the six bolts on an AAZ is 44 ft-lbs plus a 90* turn.
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#3
by
burn_your_money
on 09 Sep, 2009 16:14
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I read 22lb-ft in a post on this forum.
That would either be in reference to the bolts that hold the flywheel to the pressure plate, or it's a mistake. It most certainly is the 44 + 1/4 and they are definitely one time use bolts. Although I do reuse them and I even install them with an impact gun
That's the midnight I-have-to-have-this-thing-running-in-the-morning mechanic coming out though. If you have the time, do it right
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#4
by
rallydiesel
on 09 Sep, 2009 17:32
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I read 22lb-ft in a post on this forum.
That would either be in reference to the bolts that hold the flywheel to the pressure plate, or it's a mistake. It most certainly is the 44 + 1/4 and they are definitely one time use bolts. Although I do reuse them and I even install them with an impact gun That's the midnight I-have-to-have-this-thing-running-in-the-morning mechanic coming out though. If you have the time, do it right
Tyler, you made me check my Bentley twice!
For the 1.6, it is indeed 22 ft lbs plus a quarter turn.
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#5
by
BP10000
on 09 Sep, 2009 19:22
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ok, where do I get new 12.9 grade bolts? Facca fasteners tried to sell me 8.8 like I wasn't paying attention. I figure this is a case where it makes a difference.
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#6
by
Syncroincity
on 09 Sep, 2009 19:40
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Facca da customer before-a he find out
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#7
by
theman53
on 09 Sep, 2009 19:47
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I will send a pm. I can get ANY bolt...some of the weirder ones you may have to pay for. Metric 12.9 are some of my better sellers. Just call me when I send you my phone #. Thanks Lucas ><>
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#8
by
burn_your_money
on 10 Sep, 2009 04:49
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That would either be in reference to the bolts that hold the flywheel to the pressure plate, or it's a mistake. It most certainly is the 44 + 1/4 and they are definitely one time use bolts. Although I do reuse them and I even install them with an impact gun That's the midnight I-have-to-have-this-thing-running-in-the-morning mechanic coming out though. If you have the time, do it right
Tyler, you made me check my Bentley twice!
For the 1.6, it is indeed 22 ft lbs plus a quarter turn.
[/quote]
Well that's kind of strange. Thanks for the correction. Any idea why it would be different?
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#9
by
lord_verminaard
on 10 Sep, 2009 06:51
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That's weird. I'm gonna check mine when I get home. Having just done this I could have sworn it was more than that. I think the flywheel to pressure plate bolts, (the really small 12-point ones) were something like 22 but I thought the bigger ones to the crank were more.
These are stretch bolts, so you cannot use normal grade 12.9 in this application, you have to use the VW stuff. German Auto Parts sells a clutch install kit that comes with new crank/pp bolts, and flywheel/pp bolts, along with some other things.
Brendan
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#10
by
Turbinepowered
on 10 Sep, 2009 08:56
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According to the Quantum turbodiesel section of that Bentley, 1.6 flywheels get secured with bolts torqued to 55 ft-lbs (nonshouldered) or 74 ft-lbs (shouldered bolts).
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#11
by
Rabbit on Roids
on 10 Sep, 2009 09:10
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That's the midnight I-have-to-have-this-thing-running-in-the-morning mechanic coming out though. If you have the time, do it right
LMFAO. i so understand where you are coming from here...
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#12
by
rallydiesel
on 10 Sep, 2009 09:14
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According to the Quantum turbodiesel section of that Bentley, 1.6 flywheels get secured with bolts torqued to 55 ft-lbs (nonshouldered) or 74 ft-lbs (shouldered bolts).
Yeah but flywheels bolts and pressure plate bolts are two different things, especially on the ass backwards IDI's.
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#13
by
Turbinepowered
on 10 Sep, 2009 09:18
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According to the Quantum turbodiesel section of that Bentley, 1.6 flywheels get secured with bolts torqued to 55 ft-lbs (nonshouldered) or 74 ft-lbs (shouldered bolts).
Yeah but flywheels bolts and pressure plate bolts are two different things, especially on the ass backwards IDI's.
Don't ya mean the ass backward transverse IDIs? My longitudinal diesels all have the flywheel and pressure plate in the right places.
Yup. To clarify, that's the values for flywheel-to-crankshaft bolts.
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#14
by
BP10000
on 10 Sep, 2009 10:27
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I thought the pressure plate attached to the crankshaft and the flywheel attached to it.
I tried reusing the bolts but at least one of them gave it up on final torquing (44+1/4), so it's off to the stealership for me. At least they have free cookies.