Fast Marina Magazine

Posted: **Thu Feb 18, 2021 6:06 pm**

Thanks Chris
My intention is to follow the Haynes manual - I have a later version which appears to cover the later type cylinder which I believe I have. I'll get back to you if i get into trouble....

Cheers, Robin

Posted: **Thu Feb 18, 2021 7:14 pm**

Don’t forget your tampons

Posted: **Thu Feb 18, 2021 7:36 pm**

balmy wrote: Thu Feb 18, 2021 7:14 pm Don’t forget your tampons

Doh. I must have missed that bit in Haynes instructions.

Robin

Posted: **Sat Feb 20, 2021 7:22 pm**

Well I attempted to dissasemble the master cylinder and it's just one mass of rust. I don't think it's worth saving.

master_cylinder_us by Robin Martin, on Flickr
So the hunt is on for an alternative. After a lot of Googling i found the GMC234 which is used on the TR6. It is designed to be mounted at an angle, and the bore is 20.3. I bit larger than the cylinder used on the Marina but probably not disastrously so.

gmc234 by Robin Martin, on Flickr
It also has the advantage that the servo it is used with (still available new) looks pretty much identical to that used on the Marina.

Cheers, Robin

Posted: **Sun Feb 21, 2021 8:18 am**

A late Sherpa LDV cylinder will fit, but again bore is larger/. Which will mean less pedal travel but also less brake pressure as brake hydraulic pressure is inversely proportional to mater cylinder bore size.
Dave

Posted: **Sun Feb 21, 2021 10:50 am**

I must collect mine from you Dave.
Once lockdown finished of course
Was the other one any good? Presumably not.
Hope you're good!

Posted: **Sun Feb 21, 2021 11:11 am**

martinclan wrote: Sat Feb 20, 2021 7:22 pm Well I attempted to dissasemble the master cylinder and it's just one mass of rust. I don't think it's worth saving.
master_cylinder_us by Robin Martin, on Flickr
So the hunt is on for an alternative. After a lot of Googling i found the GMC234 which is used on the TR6. It is designed to be mounted at an angle, and the bore is 20.3. I bit larger than the cylinder used on the Marina but probably not disastrously so.
gmc234 by Robin Martin, on Flickr
It also has the advantage that the servo it is used with (still available new) looks pretty much identical to that used on the Marina.

Cheers, Robin

Robin - I would take that as an exchange unit, as long as it’s all still there.

Posted: **Sun Feb 21, 2021 9:47 pm**

Hi Robin, that pedal box had been out of a car for many, many years and i did say I had no idea of the condition of things internally but I do feel bad that the condition of it is so poor inside so I have refuned you some of the money to help out with the parts you are going to need to get it sorted out.

Barry

Posted: **Mon Feb 22, 2021 9:03 am**

MarinaCoupe wrote: Sun Feb 21, 2021 11:11 am Robin - I would take that as an exchange unit, as long as it’s all still there.

Hi Chris - yes it's all still there. I think I am going the TR6 route but you are welcome to it if it would be useful to you. I must admit, when faced with the oodles of rust that fell out when eventually managing to get the reservoir off, plus the fact I couldn't even get the pin out that sits under one of the reservoir ports (first step according to Haynes), I decided to call it a day. Someone with more experience and persistance than me might be succesful in dismantling it further.

Cheers, Robin

Posted: **Mon Feb 22, 2021 9:23 am**

Thanks Robin - that will definitely go again. I get the bores lined in stainless steel and the two part pistons, seals, springs etc replaced (hence the cost). I’ll pm you.

Posted: **Mon Feb 22, 2021 2:33 pm**

wfb wrote: Sun Feb 21, 2021 9:47 pm Hi Robin, that pedal box had been out of a car for many, many years and i did say I had no idea of the condition of things internally but I do feel bad that the condition of it is so poor inside so I have refuned you some of the money to help out with the parts you are going to need to get it sorted out.

Barry

Hi Barry. Much appreciated thank-you. Cheers Robin

Posted: **Thu Feb 25, 2021 9:10 pm**

The TR6 servo and master cylinder arrived today. Pretty much a perfect fit other than the servo needed packing out about 6mm. Temporarily done with washers but I willl make a proper spacer. The angle of the reservoir on the master cylinder is identical to that of the standard Marina one so fluid level should be good. I do like it when a plan comes together

new_pedal_box by Robin Martin, on Flickr

I should mention that the marina pedals are shortened for use in the Marlin and someone has drilled go-faster holes in them

Cheers, Robin

Posted: **Wed Jul 23, 2025 3:18 pm**

Hi everyone!
Robin I have the exact same issue and the exact same part in my 76 Marina, here in Portugal. It has been a nightmare to find a replacement and I was wondering if you finally got it fixed with the TR6 servo?
I might do the same with mine because that’s all it needs to get back on the road..
Best wishes,
Tito

Fast Marina Magazine

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