Folks,
I have offered to make a crank handle for my friend's MG Y.
It would be appreciated if someone could advise me of the details of what is needed: (a) at the end of the crank handle which engages the nut on the fan belt pulley. (b) how long the shaft of the crank handle needs to be to clear the front bumper bar.
(I don't have access to the MG Y as my friend lives in a distant city.)
Thanks for your help.
Regards, Bruce Simpson Perth, Australia
You will need some dimensions from your friend. Usually the material is
5/8th or 3/4 inch diameter bar. You want the crank bend not to overhang too far past the hole in the bumper. I would say two inches maximum. The end that fits the crank snout usually only needs a cross hole with a 5/16 or 3/8 inch pin driven in. You will need the diameter of the crank snout hole, the cross pin diameter and the length from snout to bumper. The hole shape in the bumper also gives you some ideas on the cross pin size. I used to make these up in high school for Austins and of course my Land Rover. Of course you and your friend know not to wrap your thumb around the crank handle?? Lifting the handle up is also safer than pushing down. RandyI have offered to make a crank handle for my friend's MG Y.
It would be appreciated if someone could advise me of the details of what is needed: (a) at the end of the crank handle which engages the nut on the fan belt pulley. (b) how long the shaft of the crank handle needs to be to clear the front bumper bar.
(I don't have access to the MG Y as my friend lives in a distant city.)
Thanks for your help.
Regards, Bruce Simpson Perth, Australia
Please tell me about the " Y " . Ihave been a sports car "nut" for about 50 yrs and never heard of that model. As I remember it they started with TA TC (don't think the TB ever went ino prod.) TD TF then the A and last I knew the B . Thanks. ...lew...
-- Jeff R.
Would it be possible to build in a one-way rachet system? I'm not understanding 100% how the crank handle works, but what keeps it from spinning wildly?
The pin on the end of the crank handle engages a half-circular "groove" with a tapered approach. (Hard to explain) When the engine fires, the pin (and thus, the handle) is thrust out of the hole, and disengages.
Only danger is a "backfire" and a brief backwards turn, which grasps and spins the handle.
At least, that's how my '49 Ford Anglia did it.
-- Jeff R.
"Joe AutoDrill" wrote: Would it be possible to build in a one-way rachet system? I'm not understanding 100% how the crank handle works, but what keeps it from spinning wildly? ^^^^^^^^^^^^^^^^^ Picture the screw heads in a public rest room. The "slot" has a vertical side in the *drive* direction, and a ramp in the *slip* direction.
engine starts pushing the crank rather than the other way around. Look at those one-way anti-vandalism screws used on public bathroom fixtures for the principle (if not the actual scale)!
I think the rotary lawnmower starter cord is a good example of how to do this perfectly right even in the presence of backfires, but the crank isn't so bad.
Tim.
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