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Compressing Rubber Mounts

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MJKTuck(at)cs.com
Guest

Posted: Sun Apr 19, 2015 2:23 pm Post subject: Compressing Rubber Mounts

I'm busy rehanging the engine with fresh rubber mounts.



Is there an easier way of compressing the rubber mounts such that you 

can get the threads of each bolt to show through enough to put the 

washers and nut on?



When I installed the engine first time round I seem to remember 

struggling with some kind of clamp but I can't remember what I did now. 

I figured this must be a common problem so perhaps I've missed a trick.



Any help would be appreciated.



Regards,

Martin Tuck

JonathanMilbank

Joined: 14 Apr 2012
Posts: 391
Location: Aberdeen area

Posted: Sun Apr 19, 2015 3:49 pm Post subject: Re: Compressing Rubber Mounts

What compressing? I don't understand. Admittedly I have a Classic with a different engine cradle frame, but I can't conceive that the Lord mounts would be greatly different. Yes they are fiddly and difficult to assemble and keep from falling apart while trying to hang the engine bearer onto the undercarriage frame, but if the engine is suspended at a suitable angle using straps and a hoist, with slow careful manoeuvring it all comes together until enough thread pokes through to engage the nuts on the bolts.



The last time I did this (about the 5th time), I fastened little cable tie-wraps tightly around the bolt shanks after assembling the Lord mounts into the engine bearer. This helped to minimise the tendency of the Lord mount assemblies to disintegrate while manoeuvring.



Slowly and carefully seemed to work for me.

MJKTuck(at)cs.com
Guest

Posted: Sun Apr 19, 2015 6:27 pm Post subject: Compressing Rubber Mounts

Thanks Jonathon,



The instructions say that the four AN5-40 mounting bolts must be 

tightened fully to compress the rubber anti-vibration mounts (MT04) onto 

the steel spacers MT03. That is the compressing I refer to. There is 

probably about .20 inch of compression needed on each rubber mount - 

about .40 inch in total which is about the about amount of thread needed 

to allow the nut to grab once the washers are on. In their 'relaxed 

state' when assembled there isn't enough thread poking through to engage 

the nuts on the bolts.



I assume that the steel spacers set the distance between the large cap 

washers MT02.



I can use longer bolts to get the rubbers compressed and then I like the 

idea of the tie wraps to keep them compressed while I switch out the 

bolts to the correct length ones.



I think later manuals call out AN4-41 bolts so I suspect this was a 

problem in the past.



Martin



On 4/19/2015 6:49 PM, jonathanmilbank wrote:

 	  Quote: 	
		   



 What compressing? I don't understand. Admittedly I have a Classic with a different engine cradle frame, but I can't conceive that the Lord mounts would be greatly different. Yes they are fiddly and difficult to assemble and keep from falling apart while trying to hang the engine bearer onto the undercarriage frame, but if the engine is suspended at a suitable angle using straps and a hoist, with slow careful manoeuvring it all comes together until enough thread pokes through to engage the nuts on the bolts.



 The last time I did this (about the 5th time), I fastened little cable tie-wraps tightly around the bolt shanks after assembling the Lord mounts into the engine bearer. This helped to minimise the tendency of the Lord mount assemblies to disintegrate while manoeuvring.



 Slowly and carefully seemed to work for me.





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=441011#441011

JonSmith

Joined: 21 May 2010
Posts: 110

Posted: Sun Apr 19, 2015 10:02 pm Post subject: Re: Compressing Rubber Mounts

Hi Martin, I remember having the exact problem you describe when I built mine - the uncompressed assembly being longer then the bl(at)(at)dy bolts!

I seem to remember assembling and compressing the mounts in a vice off the aircraft with the nuts and bolts, binding them tightly with locking wire, removing the bolts, assembling onto the aircraft, snipping the locking wire off then finally tightening them permanently.  (Then finding the whole things got to come off again for something else....!).   Took a while to perfect the technique and doubtless most other people have got a far more elegant method.....!

_________________
G-TERN
Classic Mono

grahamsingleton(at)btinte
Guest

Posted: Sun Apr 19, 2015 11:34 pm Post subject: Compressing Rubber Mounts

Jonathan

the rubber mounts on the Classic were not "Lord", unless supplied by Rotax. The ones that came with the Classic were much

 harder. rubber. They came from a different supplier.



Graham

  



     On Monday, 20 April 2015, 7:04, JonSmith <jonsmitheuropa(at)tiscali.co.uk> wrote:

  

  



 --> Europa-List message posted by: "JonSmith" <jonsmitheuropa(at)tiscali.co.uk (jonsmitheuropa(at)tiscali.co.uk)>



Hi Martin, I remember having the exact problem you describe when I built mine - the uncompressed assembly being longer then the bl(at)(at)dy bolts!

I seem to remember assembling and compressing the mounts in a vice off the aircraft with the nuts and bolts, binding them tightly with locking wire, removing the bolts, assembling onto the aircraft, snipping the locking wire off then finally tightening them permanently.  (Then finding the whole things got to come off again for something else....!).   Took a while to perfect the technique and doubtless most other people have got a far more elegant method.....!



--------

G-TERN

Classic Mono





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=441032#441032





< --> http://forums.matronics.com</                     -Mats.com/contribution" target="_blank">http://www.matronics.com/contribution==============

  

 

  



 [quote][b]

davidjoyce(at)doctors.org
Guest

Posted: Mon Apr 20, 2015 12:12 am Post subject: Compressing Rubber Mounts

Martin, A couple of those long adjustable clamps that carpenters use for compressing things like joints on chairs, did the job for me. Regards, David Joyce, GXSDJ 

   

 

On 2015-04-19 23:22, Martin Tuck wrote: [quote]  	  Quote: 	
		  --> Europa-List message posted by: Martin Tuck <MJKTuck(at)cs.com (MJKTuck(at)cs.com)>



I'm busy rehanging the engine with fresh rubber mounts.



Is there an easier way of compressing the rubber mounts such that you can get the threads of each bolt to show through enough to put the washers and nut on?



When I installed the engine first time round I seem to remember struggling with some kind of clamp but I can't remember what I did now. I figured this must be a common problem so perhaps I've missed a trick.



Any help would be appreciated.



Regards,

Martin Tuck



ttp://www.matronics.com/Navigator?Europa-List

ics.com

.matronics.com/contribution



	
 [b]

grahamsingleton(at)btinte
Guest

Posted: Mon Apr 20, 2015 1:15 am Post subject: Compressing Rubber Mounts

I remember what I did now, (from 20 years ago!) I used longer bolts and extra washers.



Graham

  



     On Monday, 20 April 2015, 9:11, "davidjoyce(at)doctors.org.uk" <davidjoyce(at)doctors.org.uk> wrote:

  

  



   Martin, A couple of those long adjustable clamps that carpenters use for compressing things like joints on chairs, did the job for me. Regards, David Joyce, GXSDJ

  

  

 On 2015-04-19 23:22, Martin Tuck wrote:

 [quote]  	  Quote: 	
		  --> Europa-List message posted by: Martin Tuck <MJKTuck(at)cs.com (MJKTuck(at)cs.com)>



I'm busy rehanging the engine with fresh rubber mounts.



Is there an easier way of compressing the rubber mounts such that you can get the threads of each bolt to show through enough to put the washers and nut on?



When I installed the engine first time round I seem to remember struggling with some kind of clamp but I can't remember what I did now. I figured this must be a common problem so perhaps I've missed a trick.



Any help would be appreciated.



Regards,

Martin Tuck



ttp://www.matronics.com/Navigator?Europa-List

ics.com

.matronics.com/contribution



	
 

[b]

johnwigney(at)windstream.
Guest

Posted: Mon Apr 20, 2015 6:31 am Post subject: Compressing Rubber Mounts

Hi Martin,



It is a long time ago, but I think that I bought some 1/4" hardware 

threaded rod and (i) cut it into 4 judicious lengths.

(ii) I then bolted the whole assembly up tight at each mount.

(iii) I then removed one threaded rod at a time and inserted the correct 

bolt.



I think that works.



Cheers, John

N262WF, mono XS, 912S

Mooresville, North Carolina



From: Martin Tuck<MJKTuck(at)cs.com>

Subject: Compressing Rubber Mounts

I'm busy rehanging the engine with fresh rubber mounts.



Is there an easier way of compressing the rubber mounts such that you

can get the threads of each bolt to show through enough to put the

washers and nut on?



When I installed the engine first time round I seem to remember

struggling with some kind of clamp but I can't remember what I did now.

I figured this must be a common problem so perhaps I've missed a trick.



Any help would be appreciated.



Regards,

Martin Tuck

grahamsingleton(at)btinte
Guest

Posted: Mon Apr 20, 2015 6:49 am Post subject: Compressing Rubber Mounts

I think it does work John

I did something similar

Graham

  



     On Monday, 20 April 2015, 15:32, John Wigney <johnwigney(at)windstream.net> wrote:

  

  



 --> Europa-List message posted by: John Wigney <johnwigney(at)windstream.net (johnwigney(at)windstream.net)>



Hi Martin,



It is a long time ago, but I think that I bought some 1/4" hardware 

threaded rod and (i) cut it into 4 judicious lengths.

(ii) I then bolted the whole assembly up tight at each mount.

(iii) I then removed one threaded rod at a time and inserted the correct 

bolt.



I think that works.



Cheers, John

N262WF, mono XS, 912S

Mooresville, North Carolina



From: Martin Tuck<MJKTuck(at)cs.com (MJKTuck(at)cs.com)>

Subject: Compressing Rubber Mounts

I'm busy rehanging the engine with fresh rubber mounts.



Is there an easier way of compressing the rubber mounts such that you

can get the threads of each bolt to show through enough to put the

washers and nut on?



When I installed the engine first time round I seem to remember

struggling with some kind of clamp but I can't remember what I did now.

I figured this must be a common problem so perhaps I've missed a trick.



Any help would be appreciated.



Regards,

Martin Tuck

http://www.matronics.com/contribution

dpark748(at)icloud.com
Guest

Posted: Mon Apr 20, 2015 11:38 am Post subject: Compressing Rubber Mounts

Ditto

Dave Park G-LDVO



Sent from my iPhone



On 20 Apr 2015, at 15:46, GRAHAM SINGLETON <grahamsingleton(at)btinternet.com (grahamsingleton(at)btinternet.com)> wrote:

[quote]I think it does work John

I did something similar

Graham

  



     On Monday, 20 April 2015, 15:32, John Wigney <johnwigney(at)windstream.net (johnwigney(at)windstream.net)> wrote:

  

  



 --> Europa-List message posted by: John Wigney <johnwigney(at)windstream.net (johnwigney(at)windstream.net)>



Hi Martin,



It is a long time ago, but I think that I bought some 1/4" hardware 

threaded rod and (i) cut it into 4 judicious lengths.

(ii) I then bolted the whole assembly up tight at each mount.

(iii) I then removed one threaded rod at a time and inserted the correct 

bolt.



I think that works.



Cheers, John

N262WF, mono XS, 912S

Mooresville, North Carolina



From: Martin Tuck<MJKTuck(at)cs.com (MJKTuck(at)cs.com)>

Subject: Compressing Rubber Mounts

I'm busy rehanging the engine with fresh rubber mounts.



Is there an easier way of compressing the rubber mounts such that you

can get the threads of each bolt to show through enough to put the

washers and nut on?



When I installed the engine first time round I seem to remember

struggling with some kind of clamp but I can't remember what I did now.

I figured this must be a common problem so perhaps I've missed a trick.



Any help would be appreciated.



Regards,

Martin Tuck

http://forums.matronics.com

;                   -Matt Dralcontribution" target="_blank">http://www.matronics.com/contribution

  

 

  



  	  Quote: 	
		  



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a-List"">http://www.matronics.com/Navigator?Europa-List

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[b]

MJKTuck(at)cs.com
Guest

Posted: Mon Apr 20, 2015 6:21 pm Post subject: Compressing Rubber Mounts

Thanks all for suggestions.



I managed to get them all done tonight using a combination of tie wraps 

and a small clamp along with longer bolts to compress the rubbers first. 

Then replaced each one with the aircraft grade AN5 bolt.



Took about an hour and it wasn't easy as the tie wraps kept slipping off 

the curved cap washers at first.



The bottom ones were easier as the weight of the engine compressed one 

side of the rubber mount enough that I could get the washers and nut on.



All the best,

Martin



On 4/20/2015 9:30 AM, John Wigney wrote:

 	  Quote: 	
		   Hi Martin,



 It is a long time ago, but I think that I bought some 1/4" hardware 

 threaded rod and (i) cut it into 4 judicious lengths.

 (ii) I then bolted the whole assembly up tight at each mount.

 (iii) I then removed one threaded rod at a time and inserted the 

 correct bolt.



 I think that works.



 Cheers, John

 N262WF, mono XS, 912S

 Mooresville, North Carolina



 From: Martin Tuck<MJKTuck(at)cs.com>

 Subject: Compressing Rubber Mounts

 I'm busy rehanging the engine with fresh rubber mounts.



 Is there an easier way of compressing the rubber mounts such that you

 can get the threads of each bolt to show through enough to put the

 washers and nut on?



 When I installed the engine first time round I seem to remember

 struggling with some kind of clamp but I can't remember what I did now.

 I figured this must be a common problem so perhaps I've missed a trick.



 Any help would be appreciated.



 Regards,

 Martin Tuck

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