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How to replace the exhaust silent blocs #322600
30/11/15 07:22 AM
30/11/15 07:22 AM
Joined: Dec 2011
Posts: 304
South West France
C
CBY Offline OP
Learner Plates Off!
CBY  Offline OP
Learner Plates Off!
C

Joined: Dec 2011
Posts: 304
South West France
On my 2005 Plus 4 the main silencer silent blocs seem old. I have a different configuration vs the 2006 Morgan parts handbook. It seems that an additional support had been added at the front end,the silencer lies on 4 silent blocs, 2 front, 2 back.

Have you changed these silent blocs,what is the procedure?


Regards
2005 PLUS 4
Re: How to replace the exhaust silent blocs [Re: CBY] #322612
30/11/15 10:45 AM
30/11/15 10:45 AM
Joined: Dec 2008
Posts: 18,797
South Yorkshire
DaveW Offline
Roadster Guru
DaveW  Offline
Roadster Guru
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Joined: Dec 2008
Posts: 18,797
South Yorkshire
Yes! My first Morgan job because I replaced a sports exhaust system on my Roadster with the standard system the day after I brought it home.

It should look something like this:




First make a note or take a picture of how it looks before you start.
Then undo the exhaust U bolt nuts & remove the U bolt.

Next remove the lower two nuts & washers. If you lift the exhaust slightly at this point, the metal plate with the two rubbers should fiddle out. The exhaust will lift easier if both mountings are dealt with at the same time.

To remove the rubbers from the metal plate, you may need to grip the rubber (metal washer) baseplate to stop it rotating.



And after a bit of TLC it can look like this:


Note that some bobbin rubbers have extended studs, so if you get the long version you may need to shorten the studs slightly to get them to fit.



DaveW
2005 Corsa Red Roadster S1
2016 Saffron Yellow (Narrow) AR Plus 4
Re: How to replace the exhaust silent blocs [Re: CBY] #322615
30/11/15 11:00 AM
30/11/15 11:00 AM
Joined: Aug 2014
Posts: 5,491
East Anglia
madmax Offline
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madmax  Offline
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Posts: 5,491
East Anglia
Can be a bit tricky lining up all the bits to get the U bolt through as the metal plates move out of line , so be careful ! Did this when I took off pipe from silencer back and replaced with librands 90deg side pipe !


Geneva 2016 plus 8' The Green Godess' 4 side exits .


Re: How to replace the exhaust silent blocs [Re: CBY] #322634
30/11/15 12:26 PM
30/11/15 12:26 PM
Joined: Dec 2008
Posts: 18,797
South Yorkshire
DaveW Offline
Roadster Guru
DaveW  Offline
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Posts: 18,797
South Yorkshire
A very good point. The trick is to re-assemble loose then tighten everything.

The following picture shows how a "reputable dealer" dealt with a slight mis-alignment on my Roadstsr before I bought it. This was not necessary. A bit of finesse would have sorted it. The new bracket was sourced from Uncle Melvyn. It was the first one he'd had to supply.



DaveW
2005 Corsa Red Roadster S1
2016 Saffron Yellow (Narrow) AR Plus 4
Re: How to replace the exhaust silent blocs [Re: DaveW] #322656
30/11/15 02:31 PM
30/11/15 02:31 PM
Joined: Aug 2010
Posts: 3,193
Costock, South Nottinghamshire...
Paul F Offline
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Paul F  Offline
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Joined: Aug 2010
Posts: 3,193
Costock, South Nottinghamshire...
Originally Posted By DaveW
A very good point. The trick is to re-assemble loose then tighten everything.


Is it the same as old Minis - assemble loose and then tighten everything - starting at the front and working back?


Paul
Costock, UK
2014 4/4 Rolls Royce Garnet Red
Disco 4
Teddy - 17h1 Irish Draught cross
Re: How to replace the exhaust silent blocs [Re: CBY] #322704
30/11/15 06:09 PM
30/11/15 06:09 PM
Joined: Dec 2011
Posts: 304
South West France
C
CBY Offline OP
Learner Plates Off!
CBY  Offline OP
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C

Joined: Dec 2011
Posts: 304
South West France
Thank you all for your answers.

Job done. The front bracket was bent, 2 silent blocs are sheared, and I have to take it off and to straighten it.


Regards
2005 PLUS 4
Re: How to replace the exhaust silent blocs [Re: CBY] #322828
01/12/15 12:39 AM
01/12/15 12:39 AM
Joined: May 2010
Posts: 7,316
Llanelli
sospan Online happy
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sospan  Online Happy
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Joined: May 2010
Posts: 7,316
Llanelli
When I had to fit a new silencer box to my 1993 4/4 In 201o I had the same issues to work through.
Photos taken pre dismantling to remind me of final set up.
Cleaned everything and repainted brackets etc., fitted new u-bolts and rubber bobbins.
Loose fit of everything on reassembly.

Last edited by sospan; 01/12/15 12:40 AM.

Red Plus8
Re: How to replace the exhaust silent blocs [Re: CBY] #322836
01/12/15 06:47 AM
01/12/15 06:47 AM
Joined: Apr 2008
Posts: 9,165
Gloucestershire, UK
Hamwich Online content
Needs to Get Out More!
Hamwich  Online Content
Needs to Get Out More!

Joined: Apr 2008
Posts: 9,165
Gloucestershire, UK
It's always worth remembering with these rubber AV blocks that they are designed to be used in compression rather than in tension or shear.

Dave's pictures show them being used correctly, if one tries dangling one's pipes from them they won't last very long.


Tim H.
1986 4/4 VVTi Sport, 2002 LR Defender, 1957 R4 CV, 2005 Ferrari Vipar
Re: How to replace the exhaust silent blocs [Re: CBY] #322941
01/12/15 03:02 PM
01/12/15 03:02 PM
Joined: May 2010
Posts: 7,316
Llanelli
sospan Online happy
Talk Morgan Guru
sospan  Online Happy
Talk Morgan Guru

Joined: May 2010
Posts: 7,316
Llanelli
Yes, they must be in slight compression.
The end plates with thread parts are just glued to the central rubber bobbin. There is no straight through bolt as this would negate the rubber absorbing effect.
Any tension would eventually break the glue bond.


Red Plus8

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