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Go Back   Madabout Kitcars Forum > Mad Build Area > Marlin Sportster, Cabrio, Berlinetta and Roadster builds

Marlin Sportster, Cabrio, Berlinetta and Roadster builds Enthused or Confused about your vintage Marlin build? Ask away here or show off your build.

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  #1  
Old 3rd November 2011, 21:55
Mike Mike is offline
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Smile Dual 7" Servo





I made a leap of faith and ordered the Dual 7" servo from Ducksville yesterday, and it arrived at 9am this morning.
The above shows that the trial fit is very good news. The studs attaching to the pedal box are on 85mm centres compared to the Metro ones at 90mm, so only minor hole fettling is required to make them fit.
The maximum diameter around the seam is identical to the Metro servo, so it fits the space available between engine and side panel.
The length front to back is 2" longer than the Metro, but the secondary chamber is 1" smaller in dia., so remains inside the bonnet line.
I am reasonably confident that after I have made a new adaptor plate and extension pushrod between servo and master cylinder it will still fit under the height of the bonnet.
And if I can get away without new brake pipes it will all have been so easy its untrue.
I am well chuffed - Thanks Jason for a very good spot!
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  #2  
Old 3rd November 2011, 22:19
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Well - now we know it fits. All we need now is an on the road assessment of performance!

I may have to get one myself. I might have to splash a little extra for a chrome one though, to bling up the engine bay.
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  #3  
Old 4th November 2011, 08:44
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Originally Posted by GreatOldOne View Post
Well - now we know it fits. All we need now is an on the road assessment of performance!
Jason/Robin

You are welcome to borrow mine if you would like to "try before you buy". There will be a bit of work as it will need a new adaptor plate, and push rod conversion, and probably an extension piece between servo and cylinder?
I will make permanent alterations to mine as I do not like Marlin's double pivoted extender, but I can do all that later if you are up for giving it a test?

I shall not have my car on the road for a few months yet, so I'd be interested to see what benefit you guys who have your cars on the road feel it gives. Let me know.....................
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I may have to get one myself. I might have to splash a little extra for a chrome one though, to bling up the engine bay. )
I thought about Chrome but ................American chrome? They do a polished Stainless one though.
Mike
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Old 4th November 2011, 08:22
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Quote:
Originally Posted by Mike View Post
I made a leap of faith and ordered the Dual 7" servo from Ducksville yesterday, and it arrived at 9am this morning.
The above shows that the trial fit is very good news. The studs attaching to the pedal box are on 85mm centres compared to the Metro ones at 90mm, so only minor hole fettling is required to make them fit.
The maximum diameter around the seam is identical to the Metro servo, so it fits the space available between engine and side panel.
The length front to back is 2" longer than the Metro, but the secondary diaphram is 1" smaller, so remains inside the bonnet line.
I am reasonably confident that after I have made a new adaptor plate and extension pushrod between servo and master cylinder it will still fit under the height of the bonnet.
And if I can get away without new brake pipes it will all have been so easy its untrue.
I am well chuffed - Thanks Jason for a very good spot!
Hey Mike that is good news for all of us with doubts about brake performance. What about the connection between the Servo and pedal - does that look OK as well?

Cheers

Robin
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  #5  
Old 4th November 2011, 08:52
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Originally Posted by MartinClan View Post
Hey Mike that is good news for all of us with doubts about brake performance. What about the connection between the Servo and pedal - does that look OK as well?

Cheers

Robin
Robin

I will post some photos of the new Dual 7", but it will require some adaption to make it fit the pedal. I plan to weld an extension to the push rod as I did with my Metro one, so there are no potential pivot points, and I will now have a back up servo if this one ever goes wrong.

My Metro servo adapted




I would say the Dual 7" servo seems a lot more sturdy than this Metro - typical American engineering - big and heavy!
Mike
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  #6  
Old 4th November 2011, 09:46
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Bah! Duksville are out of stock now.

Thanks for the offer of a try before you buy - but as you're going to weld / modify the pushrod - and no two sportsters are the same... I'll get one of my own once they're back in stock and modify it so it fits Vikki.

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  #7  
Old 4th November 2011, 10:29
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I suspect the new servo will need a longer extension between servo and cylinder than the Metro, as the output push-rod is inset deeper within the servo. The adaptor plate will be bigger too as the fixing hole centres are wider. The push rod is threaded and more substantial, so it will be easier to make this rigid, yet adjustable, by making a threaded extension with a fixed yoke. This will be better for adjusting/setting the final position of the brake pedal after driving it for a while.





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Old 4th November 2011, 11:06
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Wow - seeing the metro and the dual side by side really reinforces how much more assistance you'll get.
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  #9  
Old 4th November 2011, 13:07
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Hmmm - proof is in the pudding, but I'd put our cars in the lightweight 'street rod' catagory. And does the 7" they talk about there have dual or single diaphragms?
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  #10  
Old 4th November 2011, 13:19
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This is interesting - it is obviously a true "dual". Even though the 7" is not a 7" diaphragm.

Therefore, as the diaphram is the same as the original Metro it ought to offer double the boost?

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  #11  
Old 4th November 2011, 13:28
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You didn't have to get the angle grinder out Mike...

Just rang Duksville. No more Duals until after Christmas, as if he orders them he has to get 50 at a time. Rats.

I knew I should have kept this to myself...
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  #12  
Old 4th November 2011, 14:11
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I am totally bemused by this now.
I found an American site showing a 7" servo as 7" across the diaphragm chamber - which is what you would expect.
Yet the Dual 7" that I have measures only 6" across the diaphragm chamber.

So what have I received?
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  #13  
Old 4th November 2011, 14:14
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Maybe the 8" is actually the 7", and people are taking the external diameter and selling them as such, rather than the more accurate internal diameter.
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Old 5th November 2011, 09:40
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Interesting stuff, this is what happens when I don't look at the forum for a few days!!!
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Old 8th November 2011, 21:56
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I have begun the process of making adaptors to allow me to fit the Dual 7" servo:



The steel backplate is made from 6mm mild steel, and turned out on a very old lathe.
The Metro push-rod, seal and nipple are from a standard servo. I plan to use the yoke to attach the servo to the pedal.

Useful tip: there are plenty of Metros in scrapyards, but removing a servo is incredibly difficult. Buy one cheap from ebay, or.......
Go to scap-yard - find metro - remove clevis pin to pedal: remove master cylinder ( 2 x 13mm easy access nuts): then use brute force and intelligence to drive a sharp chisel into the servo and smash the plunger out the bottom. 15 minutes start to finish - trying to remove the servo could take hours - if you don't give up in total frustration!..... (Like me!) Total cost of parts - £2
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Old 9th November 2011, 00:50
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Mike. I suspect that there may be an avalanche of Marlineers interested in this upgrade. I certainly am for my disc/ disc Hunter. Keep the info coming please. You could even manufacture and sell an adaptor kit of parts for us?
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Old 15th November 2011, 19:33
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Originally Posted by Grey V8 Pete View Post
Mike. I suspect that there may be an avalanche of Marlineers interested in this upgrade. I certainly am for my disc/ disc Hunter. Keep the info coming please. You could even manufacture and sell an adaptor kit of parts for us?
Pete

I have given the idea of making an adaptor plate some thought.
My concern is that there may be owners with different master cylinders and different fixing hole centres and angles.

However, may be a way round this is to make a batch of adaptor plates with the large centre hole, and the two holes to attach to the servo, and the cut out for the vacuum elbow: but not include the master cylinder fixing studs.
Each user could then drill two holes to match their own master cylinder, and fix with counter sunk set screws? There is no need to ensure a vacuum seal, so as long as the screws are seated below the face there will be no problem.

Is anyone interested in this option?

I don't know what the cost would be, but if I can get 10-15 made locally they shouldn't be too expensive in self colour.
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Old 15th November 2011, 21:03
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Quote:
Originally Posted by Mike View Post
Pete

I have given the idea of making an adaptor plate some thought.
My concern is that there may be owners with different master cylinders and different fixing hole centres and angles.

However, may be a way round this is to make a batch of adaptor plates with the large centre hole, and the two holes to attach to the servo, and the cut out for the vacuum elbow: but not include the master cylinder fixing studs.
Each user could then drill two holes to match their own master cylinder, and fix with counter sunk set screws? There is no need to ensure a vacuum seal, so as long as the screws are seated below the face there will be no problem.

Is anyone interested in this option?

I don't know what the cost would be, but if I can get 10-15 made locally they shouldn't be too expensive in self colour.
Count me in for a 'univesal' adaptor plate.

Thanks to Mike for pursuing the idea and to Jason for finding the source and for the trial and testing phase. Well done!!
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Old 16th November 2011, 08:43
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Quote:
Originally Posted by Mike View Post

However, may be a way round this is to make a batch of adaptor plates with the large centre hole, and the two holes to attach to the servo, and the cut out for the vacuum elbow: but not include the master cylinder fixing studs.
Each user could then drill two holes to match their own master cylinder, and fix with counter sunk set screws? There is no need to ensure a vacuum seal, so as long as the screws are seated below the face there will be no problem.

Is anyone interested in this option?

I don't know what the cost would be, but if I can get 10-15 made locally they shouldn't be too expensive in self colour.
Put me down for one of those as well please :-)

Cheers Robin
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Old 9th November 2011, 09:07
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Quote:
Originally Posted by Mike View Post
The steel backplate is made from 6mm mild steel, and turned out on a very old lathe.
I assume this is the adaptor plate between the servo and the master cylinder? Looks as if you've cut a rebate for the sealing o-ring into it...
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