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When I built my RV-12 the torque specification on these bolts was 40 Nm (the Heavy Maintenance Manual edition 1, rev 3 section 71-00-00 page 20).  

I see that this manual has been updated.  Edition 2, rev. 0, September 2022 section 71-00-00 page 20 now says that the torque specification is 60 Nm AND Loctite 243 is be applied to the threads. 

With 60 hours on my plane I have some questions on how to make this change. 
1.) Can these four bolts be reused or should they be replaced?
2.) Can the engine continue to be supported by Engine Suspension Frame while the bolts are individually removed, Loctite 243 applied and then torqued to 60 Nm?
3.) Is just increasing the torque to 60Nm without applying the Loctite to avoid having to remove the bolts a good alternative?

4.) Anything else that I should be considering/doing?

 

Thanks. 

Brett 

Columbus, IN

  • Re: Torquing the Engine Suspension Frame to Engine Housing Bolts

    by » one year ago


    Hi Brett

    The Vans RV12 uses a Vans mount.  Given this perhaps you need to check with Vans regarding this question.  I have never seen an RV12 mount bolt come loose so don't get worried about it.  If this was an issue Vans would issue a bulletin.  

    As a lifelong mechanic I will offer my opinion if you still want to increase the torque.  First you must be sure that the bolt removed shows no signs of galling or corrosion.  The contact into the block must be at least 25mm (1") by Rotax specs.  If the bolt is good you can apply 243 and reinstall it to the new value.  I agree with just doing one at a time.  Be careful since the mount may have flat washers used as shims to get correct spacing between the block and mount.  The mount should have no stress points on install so the shims, if any, are important.  

    Cheers

    36511_2_Rotax ring mount assembly 2023-07-02_06-23-30.jpg (You do not have access to download this file.)

  • Re: Torquing the Engine Suspension Frame to Engine Housing Bolts

    by » one year ago


    Many thanks for your reply.  That was very helpful. 

    Any idea why Rotax increased this torque?

    With the additional parts that are now attached to engine as compared to when the engine mount was originally attached to the engine (i.e., in particular the Van’s drip trays), it is now much more challenging to torque these bolts.  I will contact Van’s about the need to make this change. 

    Thanks. 

    Brett 

     

     


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