sherpa servo with std master cyclinder

[kstrutt1]

Thought this may be useful to others. My servo stopped working so I thought as I have M16 calipers I would replicate the TR8 set up with larger servo and standard master cylinder. Firstly the problem was not the servo anyway it was the seal between the cylinder and servo, but I thought I would push on. the sherpa servo bolts straight in but the problem is the rod which pushes into the master cylinder is longer and a bigger diameter on the sherpa servo.
found out the rod is just held in with a simple spring clip which can be hooked out easily enough. hook behind the fingers of the clip and it pops out, the rod then just pulls out, to re-fit the clip a piece of tube is needed to push it back in, as I had already fitted the servo to the car I welded a washer to the end to keep it centralized. fitted with a new seal the cylinder went back in and I now have reliable assistance and a lighter pedal effort. I have some photos but no other site to load them to.

[tr7sprint1]

Please post pictures here....




<b>"GETTING SPEED OUT OF A LOW POWERED CAR IS OFTEN MORE REWARDING, THAN WITH TIRE-SMOKING BRUTES" </b>
<h4><center>http://cliffstr7sprintconversion.blogspot.com/</center></h4>

[FI Spyder]

<blockquote id="quote"><font size="1" face="Century Gothic, Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by kstrutt1</i>

I have some photos but no other site to load them to.
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

You can load them to any free photo hosting site like Photobucket then link them to here.


- - -TR7 Spider - - - 1978 Spitfire- - - - 1976 Spitfire - - 1988 Tercel 4X4 - Kali on Integra - 1991 Integra - Yellow TCT

[kstrutt1]

does this work?

[kstrutt1]

[kstrutt1]

[kstrutt1]

[img]http://i1300.photobucket.com/albums/ag95/kstrutt1/BILD1128.jpg[/img

[kstrutt1]

Well I have finally managed to add some photos, one shows the two rods side by side, one shows the clip which holds it in, the smaller ones show the tool I made to fit it and the other the failed seal, finally one of it in the car with the cyhlinder about to go on.

[Chunk]

The Sherpa servo normally comes with a Sherpa master cylinder, so it would have the correct push rod fitted. This shows the importance of matching parts. The short rod fitted to a Sherpa would give a long pedal. Not good.

1979 TR7V8 FHC.
DJE 4.6 Block and Heads.
22 years of tinkering and tuning......So far!
Now available in red.

[dursleyman]

Wouldn't it have been much easier to fit the Sherpa cylinder as well which is a bit larger bore that the TR7/8 and would avoid the extra complications? Should work nicely with the M16 calipers.

I found an "uprated" servo assembly on Ebay which came off a TR7V8. The seller couldn't remember which supplier it came from but he assured me it had not done much work. I have fitted new seals to the cylinder just to be sure.
The servo drum is black so its probably based on an SD1 (Sherpa ones are gold according to Roger Williams book) and is about 225mm diameter. The brake cylinder has a bore of 22.2mm so together that wiil give quite a good increase in pressure and fluid movement.
It looks to be a really neat swap but I guess there are not too many SD1's left to act as doners these days.
It will go onto the car together with a 4 pot brake kit based on the SD1 Vitesse so the increase in stopping power will be considerable.



Russ

1980 TR7 Sprint DHC
Dursley
UK

[kstrutt1]

I wanted to take advantage of the reduction in pedal effort, hence why I wanted to use the std master cylinder, I had never felt the pedal travel long either, so didn,t see the need to move to a sherpa cylinder.

It was actually very easy to do the whole job took less than an hour.