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Very strange clutch problem

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Very strange clutch problem
#1
jaheba33 Avatar
jaheba33 Shaun P
Jeffersonville, VT, USA   USA
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1970 MG MGB MkII "Odin"
Car ran just fine with a great clutch. Parked it overnight, and the next morning when I was ready to take the 70B for a ride, there was very little clutch. It engaged very quickly about an inch from the floor. Just plain weird. Fluid is good. Could it be the master cylinder or the slave cylinder. Could it just need bleeding. Of course the weather, about 10 degrees for the past few days doesn't help, but I have never had a clutch go bad so quickly. I just replace the master brake cylinder, and wondering if I should just replace all clutch components as well. Thanks so much guys.

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Re: Very strange clutch problem
#2
lewisrn Avatar
lewisrn Gold Member Bob L
Danville, IN, USA   USA
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1980 MG MGB "The "B"
In reply to # 2857164 by jaheba33 wondering if I should just replace all clutch components as well. Thanks so much guys.

Sounds like that's what you need to do. Change master, slave and hose for many years of peace of mind.


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Re: Very strange clutch problem
#3
oldredsel Avatar
oldredsel Silver Member Rick Crosby
South Dartmouth, MA, USA   USA
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1959 Edsel Villager "OLD Red EDSEL"
1969 MG MGB GT "Barn-ey Rubble"
1969 MG MGB GT "Emma"
1974 MG MGB V8 Conversion "The Hot Rod"    & more
Good Morning Shaun,

Since you just replaced the master, I'd try re-bleeding it first. Unless of course, I saw fluid leaking at the master (wet pedal?) or the slave. Nothing to loose but a little bit of labor.

Cheers,

Rick

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Re: Very strange clutch problem
#4
herculesmgb1971 Avatar
herculesmgb1971 gerard boulanger
Hercules, CA, USA   USA
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1971 MG MGB MkII
Replace clevis pin as well at slave

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Re: Very strange clutch problem
#5
dipstick Avatar
dipstick Kenny Snyder (RIP)
La Center, WA, USA   USA
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1941 Ford N-Series
1958 MG MGA 1500 Coupe "Rosie"
1970 MG MGB GT "Pat's GT"
1971 MG MGB "Gifted To Me"    & more
"...and the next morning when I was ready to take the 70B for a ride, there was very little clutch."

I have never experienced a pressure plate/clutch disc/release bearing failure with the car (any car) sitting still not running. Several experiences waking up to a failed slave cylinder and/or clutch master cylinder. The first suspect is the slave cylinder.


Be safe out there.
Kenny

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Re: Very strange clutch problem
#6
ErnieY Avatar
ErnieY Ernie Y
Albatera, Alicante, Spain   ESP
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1976 MG MGB GT
I had a slave go in the matter of 30 minutes, parked it up it was fine came out of where I was and zero clutch, and I mean ZERO !

Fortunately where I'd just been just happened to be an MG restorer in Rotterdam so I was able to go back in and buy a seal kit and fix it there and then, lucky or what ?

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Re: Very strange clutch problem
#7
RAY 67 TOURER Avatar
RAY 67 TOURER Ray Marloff
Fort Bragg, CA, USA   USA
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1967 MG MGB "My Girl"
A drop in temperature can cause a slight shrinkage of a rubber seal. This will cause your master cylinder to "bypass" the fluid past the new seal and result in almost no clutch action. I've seen this quite a few times. RAY

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Re: Very strange clutch problem
#8
lehmanb Avatar
lehmanb Bart Lehman
columbia, s.carolina, USA   USA
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1962 Austin-Healey 3000 "Driver"
1973 MG MGB
I agree with Ray. Park it where it can be warmer and see what happens. Maybe you only need a kit for the master. Bart

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Re: Very strange clutch problem
#9
HiPowerShooter Avatar
HiPowerShooter James Booker
Lake Winneconne, WI, USA   USA
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1973 MG MGB
This is why so many Subaru OB's from the early 2K's smell like gas when the temp drops below 20 or so. The injector seals shrink slightly allowing a tiny amount of fuel to seep through after sitting overnight. After it warms up...it's gone. Low temps do strange things to rubber seals sometimes.

In reply to # 2857315 by RAY 67 TOURER A drop in temperature can cause a slight shrinkage of a rubber seal.


"One test is worth a thousand expert opinions"--Alvin "Tex" Johnston...Boeing test pilot.

"Who do you think you are? I am."...Pete Weber

73 MGB. Tires: Round, black, hold air. Oil: Sometimes old, sometimes new...always slippery. Oil filter: Yellow, usually full of oil. Carbs: 2 SU HIF. Distributor: Yes. Headlights: Not that bright but bright enough. A bunch of other stuff most cars have but not really important enough to itemize. Oh, wait...it has a cool sounding exhaust with stickers on the chrome tips. Really slays the ladies...

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Re: Very strange clutch problem
#10
Donthuis Avatar
Donthuis Don van Riet
Rijswijk, ZH, Netherlands   NLD
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1972 MG MGB MkIII
In reply to # 2857192 by dipstick "...and the next morning when I was ready to take the 70B for a ride, there was very little clutch."

I have never experienced a pressure plate/clutch disc/release bearing failure with the car (any car) sitting still not running. Several experiences waking up to a failed slave cylinder and/or clutch master cylinder. The first suspect is the slave cylinder.

No statistically it is the master cylinder, which fails much more often than the slave sad smiley

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