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TR2/3/3A Clutch issue maybe master cylinder

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Got_All_4

Got_All_4

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Started noticing last week after 400 miles and after rebuild that the clutch was getting a mushy feel. (rebuild means the car, including clutch plate replaced, through out bearing and a thorough bleeding of hydraulics). Turns out there is now a 1/2 inch of play in the master cylinder push rod. Last week it might have been 3/8" so it could be getting worse. Fluid level is at the top. I can push the rod forward a 1/2" before it hits the piston. What could be going on?

Another problem has arrived with the water pump after a 50 mile ride tonight. I'll post a separate message.
 
HighAltitudeTR3

HighAltitudeTR3

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I had to bleed my clutch a few times to get the bubbles out, not sure why, its such a short run.

Have you tried bleeding it again?
 
CJD

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It sounds like the piston may not be returning all the way. That would be the likely explanation for an increase in the pedal linkage play at the MC.

I once rebuilt an MC, and had that issue. I had to disassemble it again and polish the cylinder bore so the piston would return fully. Of course a weak return spring (also inside the cylinder) could also prevent the piston from returning fully too.
 
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Got_All_4

Got_All_4

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Who ever said the return spring is broke won! No can I go to a hard where store and get a spring to work out of one of their assortments?
 

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charleyf

charleyf

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Or the auto parts store for a rebuild kit. You would need to determine if you have a .75 ( likely) or .70. But with either kit you should get the spring. The remainder of the kit would be for good measure, if you use it.
Charley
 
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titanic

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I don't think the springs are included in rebuild kits. I have some old ones, yours for the postage, or I can measure one and give you the dimensions.
Berry
 
donbmw

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Make sure you also have the outside return spring. This can cause the same problem over sometime.

Don
 
Sarastro

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I've seen MC rebuild kits that included springs, but usually they don't. In the worst case, you can get a new MC from Victoria British for $32. If it were me, though, I'd try to find a new spring at the hardware store. Just the way I am--hate to throw good hardware away.
 
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Got_All_4

Got_All_4

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I was watching the IRL race Saturday night and during the big crash I went into the garage and started rummaging through a bunch of old parts I've got around. Found a TR7 clutch master cylinder and by eye ball site they looked close. Took it apart and low and behold it had a perfectly good spring and it was the exact size. Reassembled after the race and went on a 80 mile trip Sunday and worked perfect. I did stop at the hardware store and they did have a spring that was the correct diameter and length. put it in the glove box. You never know.
 
Sarastro

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TomMull

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CJD said:
It sounds like the piston may not be returning all the way. That would be the likely explanation for an increase in the pedal linkage play at the MC.

I once rebuilt an MC, and had that issue. I had to disassemble it again and polish the cylinder bore so the piston would return fully. Of course a weak return spring (also inside the cylinder) could also prevent the piston from returning fully too.
Click to expand...
Have the same issue with a newly rebuilt cylinder, worked fine on the bench but started to hang as soon as it got fully rinsed with DOT 5. Curious as to how you polished it.
Tom
 
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