Renault Scenic (1999 - 2003) - 2000 1.6 - crankshaft bolt

Honest John Back Room » Technical matters
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Tue 30 Sep 2008 18:09
2000 1.6 scenic crankshaft bolt - Number_Cruncher
There's *no* direct read across between the torque value and the angle tightening method, so, it's impossible to say with certainty that it will be OK.

Usually, when angle tightening is used, the bolt is put into its plastic defomation region, and usual good practice is to replace the bolt (some applications allow re-use if the bolt is measured to be below a specified length).

So, get a new bolt, and follow the specified tightening procedure properly - it's the only way to be sure.

The angle tightening method carried out approximately using a cheap protractor is far more accurate and repeatable in pre-loading the bolt than even the most accurate torque wrench in the world - it's the correct engineering specification for high performance joints.
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Tue 30 Sep 2008 22:38
2000 1.6 scenic crankshaft bolt - juggler
thank you for that, im hoping to replace the bolt within a couple of days, is it ok to tighten the bolt with the timing pin in and cam shaft bracket attatched to prevent the crank turning or would these attatchments not be sufficient for the torque involved, it is an automatic so cant i use the teeth on the starter ring. And should 100lb hold for now.

juggler
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Tue 30 Sep 2008 22:58
2000 1.6 scenic crankshaft bolt - Number_Cruncher
>>it is an automatic so cant i use the teeth on the starter ring

Why not?

Whatever you do, don't try to lock the crank by using anything on the cam - you'll cause serious damage.
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Sat 4 Oct 2008 13:23
2000 1.6 scenic crankshaft bolt - juggler
apparantly i read somewhere on the net, the flywheel on an automatic is of softer metal than a manual and the teeth wont take the torque?

so how do you stop the crankshaft from turning while tightening the nut?
use the timing pin to stop it turning?

thank you
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Sat 4 Oct 2008 15:56
2000 1.6 scenic crankshaft bolt - Peter D
The flywheel may be as it is not a clutch fiction material however the starter ring is the same. The proper tool for this has around eight teeth welded to a plate that are a negative image of the starter ring and the plate bolts onto the starter mounting and locks the flywheel. Speak to you local independant he may lend/rent it to you for a couple of hours. Regards Peter
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Sat 4 Oct 2008 19:09
2000 1.6 scenic crankshaft bolt - juggler
many thanks for the comments and answers, the situation is currently i have done about 300miles since my first question, ive obtained another bolt and attempted to remove the old one using the same principle as previous, but it hasnt budged and is still over 100lbs torque. i shall now obtain the tool as Peter D has mentioned and redo the job, er when ive found the starter motor!!!
great site, thanks, juggler
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