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MGA Master Cylinder Push Rods

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MGA Master Cylinder Push Rods #1 This topic is about my 1957 MG MGA 1500 Coupe
3066james Jim Cheatham MOSELEY, VA, USA Sign in to contact 1957 MG MGA 1500 Coupe	Topic Creator (OP) Sep 29, 2016 09:49 AM Top Contributor Joined 12 years ago 4,492 Posts

Why do the master cylinder push rods have two nuts? I know one is to tighten against the fork but the other one is just there without serving any purpose as far as I can see. Is it supposed to be tightened against the first one as a lock nut? That's the only purpose I can think of. Mine were separate when I got the car as shown in the attached illustration.

Jim

image.jpg 19.9 KB

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Re: MGA Master Cylinder Push Rods #4
3066james Jim Cheatham MOSELEY, VA, USA Sign in to contact 1957 MG MGA 1500 Coupe	Topic Creator (OP) Sep 29, 2016 11:33 AM Top Contributor Joined 12 years ago 4,492 Posts

Chuck,
My car is a 1500. There are two nuts on each rod even though only one is pointed to in the illustration I attached to my original post. The "hex formed on the rod" is actually a nut on my rods. Gary's reference to Barney's site answered my question. Here's what it says - "According to the SPL, the 1500 model is a plain rod with two hex nuts, implying that one of the nuts has to be jammed against end of thread to be one with the rod, providing wrench flats to turn and hold the rod during adjustment, while the other nut is used as jam nut against the clevis. According to the SPL, the 1600 model has a cold headed hex in the middle of the rod, and one hex nut to be used as jam nut against the clevis."

Thanks
Jim

In reply to # 3364117 by cschaefer There is only one nut (#27) in the phicure. It is used as a stop nut (locking nut) against the threaded clevis (#28) Are you thinking the hex formed on the pushrod itself is a nut? It is used to rotate the pushrod into, or out of, the threaded fork. Then the locknut is tightened against the clevis.

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Re: MGA Master Cylinder Push Rods #5
bobs77vet bob K. northern Va, VA, USA Sign in to contact	Sep 29, 2016 02:26 PM Top Contributor Joined 11 years ago 8,263 Posts

i always assumed they were jamb nuts, i have seen these on lots of my old cars

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Re: MGA Master Cylinder Push Rods #6
cschaefer Chuck Schaefer West Chicago, IL, USA Sign in to contact 1969 MG MGB GT	Sep 29, 2016 08:15 PM Top Contributor Joined 15 years ago 2,862 Posts

Jim right you are. My '56 1500 had 2 nuts. I was working off your factory diagram and a poor memory. Sorry if I lead you astray. Perhaps a judicious application of Permatex Threadlocker would be a belts and suspenders to simply running the one nut up to the end of threads. (or an application of J-B Weld), just to lock that nut to the pushrod for long term.

Bob, the forward nut should be locking against the clevis, not the rear nut.

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Re: MGA Master Cylinder Push Rods #7
3066james Jim Cheatham MOSELEY, VA, USA Sign in to contact 1957 MG MGA 1500 Coupe	Topic Creator (OP) Sep 29, 2016 08:49 PM Top Contributor Joined 12 years ago 4,492 Posts

Chuck,
Don't worry. I've been lead astray before for worse things! smiling smiley

Now that we have that straight, how do you know how far to push the rods into the master cylinder?

Jim

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Re: MGA Master Cylinder Push Rods #8
Rob Z Rob Zucca Camarillo, CA, USA Sign in to contact 1948 MG TC 1960 MG MGA	Sep 29, 2016 09:06 PM Top Contributor Joined 8 years ago 4,041 Posts

Push the rods in until they just touch the piston and the clevis drops over the pedal end and the pin will slip through. Then adjust the rod with either the cast hex or rear nut until you get about 1/32 of front to back movement with the pedal at rest. Then snug the jam nut up against the clevis so the rod can't spin.

"Time flies like an arrow......Fruit flies like a banana"

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Re: MGA Master Cylinder Push Rods #9
3066james Jim Cheatham MOSELEY, VA, USA Sign in to contact 1957 MG MGA 1500 Coupe	Topic Creator (OP) Sep 29, 2016 09:14 PM Top Contributor Joined 12 years ago 4,492 Posts

Thanks Rob

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Re: MGA Master Cylinder Push Rods #2
Gary E Gary Edwards Kernersville, NC, USA Sign in to contact 1962 MG MGA MkII	Sep 29, 2016 11:09 AM Top Contributor Joined 17 years ago 16,300 Posts

Re: MGA Master Cylinder Push Rods #3
cschaefer Chuck Schaefer West Chicago, IL, USA Sign in to contact 1969 MG MGB GT	Sep 29, 2016 11:13 AM Top Contributor Joined 15 years ago 2,862 Posts

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