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rear dampers thread size please


stugrip

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I have x threaded the bolt that secures the damper to the axle, although my manual shows a stud from the axle mine is a bolt and whilst rplacing a damper the bolt has entered the hole in the axle off square. It has only gone in 2 turns so i hope to use a thread restorer to corect it, but size i am unsure of. is it 12mmx1.25 it appears a bit tight and i dont want to force it. Any help welcome

stu

 

L7 VVC

Its blue 150 bhp

I like it

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  • Area Representative

A bit more detail would help. If it's an Arch chassis it will be imperial. Are you talking about a de dion tube mount? Mine is 1/2 inch UNF bolt.

 

Paul Richards

Area Representative - L.A.D.S. (Lancashire and District Sevens)

LADS Website

Growing old is compulsory - Growing up is optional

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sorry yes de dion mount i fixed the top mount on the damper and realised too late the entry angle of the bottom bolt, so i will try to rescue it with a tap. i checked the bolt with a thread comb but it was metric only and appeared a close match but not conclusive . Do i need spring compressers to enable the damper to be fitted without the top mount? It appears i need to hold the damper with the top leaning toward the front of the car or rotate the dedion tube anti clock (when looking from drivers side) a few degrees.... but that cant be right!!! any guidence welcome.

stuart

 

L7 VVC

Its blue 150 bhp

I like it

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sorry to sound stupid, but if i try to fit the bottom first i cant get the bolt to enter at the right angle becuase the only place to put the top of the shock is in its fixing point. I have tried to jack under the disk in a hope it woul rotate the axle but it just raises vertically then the shock becomes too long.

stuart

 

L7 VVC

Its blue 150 bhp

I like it

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Stu,

 

Are you supporting the car via the DD tube, or the chassis somewhere else?

 

The assembly guide says:

Rear Suspension

 

REAR SPRING DAMPER ASSEMBLIES

NOTES

(1) The rear spring damper units are only

fitted at this point if the standard roll over bar is

to be installed.

(2) If the track day roll over bar or roll cage is

to be installed do not install the spring damper

units yet, refer to Section 16.

12 Insert a sleeve into the top bush of the

damper unit (close coils of spring are at the top),

align the top bush with the top mounting and

insert the top mounting bolt (4) through the

access holes provided in the seat back panel.

Tighten to 54 Nm once the spring damper unit

has been attached to the De Dion tube.

13 The lower spring damper mounting is

secured to the threaded boss welded to the

underside of the De Dion tube. Pass bolt (3)

through spring washer (16), plain washer (13),

the spring damper unit and plain washer and

secure to the De Dion tube. Tighten to 54 Nm.

NOTE

Because the suspension is not under load, the

bottom bush of the damper unit and the

mounting on the De Dion tube will not be in

alignment. Take great care not to cross-thread

the bottom mounting bolt. If necessary remove

the mounting bolt from the rear of the ‘A’ frame

to allow more movement of the De Dion tube.


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