Clutch master cylinder re-build.
Posted: Sat Apr 12, 2025 5:07 am
I couldn't find anything on the site to illustrate this so here are a few pics. concerning the M/C re-build using "Repair Kit For NISSAN 1600 311 SP311 1.6L K7762X". (The M/C is a Tokico 5/8" which is common to the 310 and the 311)
The master cylinder was still working OK but was losing fluid into the cabin and engine bay at the firewall.
Clearly we had a hydraulic leak and the seal(s) were suspect.
The piston was removed and here are the component parts.
The two large seals that fit over the piston are of different profile so make sure you note that and replace like for like.
I have laid out the rebuild seals in the same order to illustrate where everything goes.
You have to note which way the tiny seal on that pin on the LHS goes but it only sits correctly when you have it right.
Once assembled with a little PBR Rubber Grease all seems to be well
When I dissembled the seals from the piston the cabin side seal seemed to be harder than the engine bay side.
I guess lack of use had caused it to deteriorate and leak
Not a real hard job to do, but it does require good eyesight, dexterity and a vice to hold the item securely when re fitting the piston retaining circlip.
Clearly we had a hydraulic leak and the seal(s) were suspect.
The piston was removed and here are the component parts.
The two large seals that fit over the piston are of different profile so make sure you note that and replace like for like.
I have laid out the rebuild seals in the same order to illustrate where everything goes.
You have to note which way the tiny seal on that pin on the LHS goes but it only sits correctly when you have it right.
Once assembled with a little PBR Rubber Grease all seems to be well
When I dissembled the seals from the piston the cabin side seal seemed to be harder than the engine bay side.
I guess lack of use had caused it to deteriorate and leak
Not a real hard job to do, but it does require good eyesight, dexterity and a vice to hold the item securely when re fitting the piston retaining circlip.
