chrispratt
Well Known Member
Are any of you familiar with overhauling the Grove Brake Master Cylinder Model 673-13 used on the RV-8? I have the overhaul kit and instructions from Grove.
The Grove equipment is very nicely made and quite a bit different in construction than some other master cylinders (think Matco). They have worked well for 16 years but the master cylinders seem to be having a hard time holding the -8 in place even for a runup. I see no visible hydraulic fluid leakage anywhere and have already replaced the O-rings in the brake pucks (twice) and bled the system three times. The O-rings in the cylinders seem the only other suspect.
I have two questions I could use some experienced help on:
1. Instruction 2.c says “using a pliers, unscrew the spring guide from the lower end of the piston rod. (See highlighted area of photo 1.) It would seem to me that using a pliers would severely score the metal which is something I do not want to do. Is there another way or a trick (like a special type of pliers) to keep the surface as pristine as it is now.
2. Once I’ve installed the O-Rings from the overhaul kit and start reassembly, Instruction 4.e says “Apply Lock-Tite 262 to the lower threads of the piston rod. Allow to dry for 24 hours before exposing to hydraulic fluid.” Is there a readily available alternative to Lock-Tite 262. I haven’t found any at Home Depot, or Lowe’s or auto stores like O’Reillys. I found some on Amazon but it won’t arrive until the end of November.
So the simple task (or so I thought) of overhauling the master cylinders is becoming a challenge and I’d appreciate any suggestions from someone who has actually done this and is willing to share.
Thanks.
Chris
The Grove equipment is very nicely made and quite a bit different in construction than some other master cylinders (think Matco). They have worked well for 16 years but the master cylinders seem to be having a hard time holding the -8 in place even for a runup. I see no visible hydraulic fluid leakage anywhere and have already replaced the O-rings in the brake pucks (twice) and bled the system three times. The O-rings in the cylinders seem the only other suspect.
I have two questions I could use some experienced help on:
1. Instruction 2.c says “using a pliers, unscrew the spring guide from the lower end of the piston rod. (See highlighted area of photo 1.) It would seem to me that using a pliers would severely score the metal which is something I do not want to do. Is there another way or a trick (like a special type of pliers) to keep the surface as pristine as it is now.
2. Once I’ve installed the O-Rings from the overhaul kit and start reassembly, Instruction 4.e says “Apply Lock-Tite 262 to the lower threads of the piston rod. Allow to dry for 24 hours before exposing to hydraulic fluid.” Is there a readily available alternative to Lock-Tite 262. I haven’t found any at Home Depot, or Lowe’s or auto stores like O’Reillys. I found some on Amazon but it won’t arrive until the end of November.
So the simple task (or so I thought) of overhauling the master cylinders is becoming a challenge and I’d appreciate any suggestions from someone who has actually done this and is willing to share.
Thanks.
Chris
