Citroen Xsara Picasso (2000 - 2010) - 2000 2.0HDi Crank Pulley Bolt

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Fri 20 Feb 2009 11:24
2000 2.0HDi Crank Pulley Bolt - herworsehalf
Hello there,

I was wondering if anybody could be kind enough to let me know the Torque/Angle specified for the crank pulley bolt for my Picasso 2.0 HDi.

It's all back together after a cambelt change, but I can't find my book with the figures in!

Thanks in advance,
Rich

{corrected typo in header}

Edited by Dynamic Dave on 20/02/2009 at 12:39

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Fri 20 Feb 2009 11:42
2000 2.0HDi Crank Pully Bolt - thomp1983
50nm plus 62 degrees plus 5 degrees

chris

Edited by thomp1983 on 20/02/2009 at 11:43

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Fri 20 Feb 2009 12:04
2000 2.0HDi Crank Pully Bolt - herworsehalf
Thanks very much Chris, that's very kind of you.

Can I just ask why the angle setting is split into two steps on this one? All the ones I've done previously have had a single setting, and I'm just wondering why you'd have a second angle stage on a single bolt?

Cheers,
Rich
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Fri 20 Feb 2009 13:24
2000 2.0HDi Crank Pully Bolt - thomp1983
I've no idea, there are two settings listed, one for pre '99 cars which is 40nm and 51 degrees and one for post '99 which is the one i gave you, i personally can't see the difference between doing it at 67 degrees in one go and splitting it unless there just wouldn't be enough room to move the torque wrench through that range.

chris

Edited by thomp1983 on 20/02/2009 at 13:26

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Fri 20 Feb 2009 14:14
2000 2.0HDi Crank Pully Bolt - Number_Cruncher
>>i personally can't see the difference between doing it at 67 degrees in one go

Not wise.

Angle tightening methods tend to take the bolt into its plastic region - i.e., beyond yield. Also, after initial tightening, the joint tends to relax over a minute or two, as any asperities plastically deform, and yield.

So, you do the initial tightening, and then after a short while, top up with the 5 degrees to account for the joint relaxation, which won't happen again once the joint is settled.

If you do 67 in one go, you'll overstress the bolt, and the joint will relax further than the inital setting.
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