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Crank Pulley Nut

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Noble66 Avatar
Noble66 Gold Member Noble Bradford
Orlando, FL, USA   USA
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1964 MG MGB "Black Betty"
1966 MG MGB "Betty White"
1969 MG MGC GT "Lola"
The crank pulley on my 69 MGC GT fell off. Apparently the PO didn't use a lock tab. Regardless I thought this an easy fix until I realized it is attached with a nut, not a bolt as there are no threads on my crank shaft nose for a nut. I have checked the nose of the crankshaft and there seem to be threads in there. Is there a stud that can be fitted to this? Or will a bolt suffice? I was planning on trying the nut off the MGB that I have but that might be a long shot. I did manage to recover the pulley damper from the road and it seems undamaged. It is a hearty chunk of metal. I would hate to have to replace the entire crankshaft for this as this a strong running engine with great oil pressure.

Any help will be appreciated.

Noble

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kirks-auto Robert Kirk (RIP)
Davenport, IA, USA   USA
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In reply to # 3192248 by Noble66 ...as there are no threads on my crank shaft nose for a nut.
I have checked the nose of the crankshaft and there seem to be threads in there....

Noble,
Good to see you aren't always lurking! winking smiley


It can't be both ways. Either you have threads or they are stripped off. Which is it?
I have the correct nut and it isn't MGB I can assure you.



Regards,
Robert Kirk

kirkbrit@yahoo.com
E-mail PLEASE for quote/questions/orders

Business phone 563 323 1017

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Swamperca Avatar
Swamperca Swamper Ca
Calimexistan, North Mexico, -----------------   ---
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1970 MG MGB GT
1971 MG MGB "Rubee"
1974 MG MGB "Groovy B"
Picture?

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Swamperca Avatar
Swamperca Swamper Ca
Calimexistan, North Mexico, -----------------   ---
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1970 MG MGB GT
1971 MG MGB "Rubee"
1974 MG MGB "Groovy B"
Here is a couple of what you should have.


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Noble66 Avatar
Noble66 Gold Member Noble Bradford
Orlando, FL, USA   USA
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1964 MG MGB "Black Betty"
1966 MG MGB "Betty White"
1969 MG MGC GT "Lola"
I will get a picture when I get home. What I see is just the smooth crankshaft nose and I felt the keyway. There is no threaded portion extending past that. When I put my fingertip in the end I feel threads on the inside. That's why I thought it would be an easy fix. It looks just like the crankshaft nose on a B.

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BAHAMIAN C Avatar
BAHAMIAN C Dave Burley
Roscommon, Up North Michigan, USA   USA
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Noble-

I don't believe there are any female threads in the nose of a C crank. As per Swamper's pics.,it should be male threads to accept a big ass'd nut. MGBs use a bolt in that location, but, it's about the same size as the male threaded portion in Swamper's pics.

Hate to say without pictures, but, it sounds like your crank nose may have broken right at the step-down to the male threads. Even if the hole in the nose of your crank is female threaded, that bolt wouldn't be near large enough to hold the balancer on without the use of some sort of fender washers.

Not trying to be a "Debbie Downer" but, all C cranks really should have a male threaded nose.

Hope to be proven wrong when you post some pics.

Hope it works out-

Dave

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Noble66 Avatar
Noble66 Gold Member Noble Bradford
Orlando, FL, USA   USA
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1964 MG MGB "Black Betty"
1966 MG MGB "Betty White"
1969 MG MGC GT "Lola"
As it turns out I'm feeling quite the fool. The belt was laying on the threads. Robert, I'm going to need that nut now. And a key and lock tab. Lol.

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BAHAMIAN C Avatar
BAHAMIAN C Dave Burley
Roscommon, Up North Michigan, USA   USA
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Noble-

So glad to hear my "worst case scenario" turned out to be false! smiling bouncing smiley Just don't forget the Blue Loc-Tite thread locker!

And, be sure to read Swamper's thread... Crank pulley Nut "Torque Spec".

Glad it's working out! thumbs up

Dave

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ron neal Avatar
Coastal, SC, USA   USA
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1962 MG MGA MkII
1968 MG MGC
1969 MG MGC
1969 MG MGC GT    & more
Noble
Glad to hear its sorted. I have never had any issues with the lock tabs failing but see no issues with a little lock-tite insurance.

Dave
Getting cold up north? Gonna get a little freeze here Sunday.
Ron

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romeo69 Avatar
romeo69 Stephen Curtis
, Berkshire, UK   GBR
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1967 MG MGC
If it done the crank key way due to being lose . It will be a crank replacement

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ga duke Avatar
ga duke Mike Dooley
Newnan, GA, USA   USA
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Swamper:
Don't forget to put your harmonic balancer on before you install...might leak a little!!!

M

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