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Crank pulley Nut "Torque Spec"

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Crank pulley Nut "Torque Spec"
#1
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"
Anybody know the torque spec for the harmonic balance nut???? My manuals don't seem to give one.

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Re: Crank pulley Nut "Torque Spec"
#2
BAHAMIAN C Avatar
BAHAMIAN C Dave Burley
Roscommon, Up North Michigan, USA   USA
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John-

Manual probably doesn't give torque spec. because they call for one of those "fold-over" lock tab washer. Those OEM lock tab washers worked well, because they were good firm steel. New replacements are so flimsy, they can't be trusted... Don't ask how I know!eye rolling smiley

I think it was Rick Ingram that posted once, all bolts get tightened to "just shy of the point of shear". Good advice for that particular nut.

I lost mine once. First, they're very expensive to replace. Second, with that nut loose or AWOL, it sounds like the whole crank is flopping around in the oil pan. Third, it makes a heck of a mess of the Woodruff keyway in both balancer and crank nose.

I have since gone the belt / suspenders / belt route. Tight as I can get it with a 24" Crescent wrench, Blue LOC-TITE, and the best lock-tab washer I can find.

Hope this helps-

Dave

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Re: Crank pulley Nut "Torque Spec"
#3
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"
I've got it at 100' lbs and I used blue Lock-Tite thread locker. New lock tab bent over should hold it.

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Re: Crank pulley Nut "Torque Spec"
#4
BAHAMIAN C Avatar
BAHAMIAN C Dave Burley
Roscommon, Up North Michigan, USA   USA
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The problem I've found with the tab washers available nowadays is that they're so flimsy that the little tang that fits into the keyway shears off very easily. Great care has to be taken that the washer doesn't turn AT ALL, when tightening the nut.

But, I'm sure you knew all that. thumbs up

Later-

Dave

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about 1 week and 3 days later...
Re: Crank pulley Nut "Torque Spec"
#5
windjammerusn40 Avatar
windjammerusn40 Gold Member windjammerusn40 McCord
East Peoria, IL, USA   USA
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1968 MG MGC GT
So if you have an automatic, what do you place where to hold the crank still while you try to tighten the nut?

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Re: Crank pulley Nut "Torque Spec"
#6
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"
That's a good question! Maybe put a couple of bolts into the from of the harmonic balancer where the smog pump pulley bolts on and a stiff breaker bar across them to the floor so it won't turn. Just sort of an idea. I used a bar thru the drive shaft universal but I have manual trannies.

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Re: Crank pulley Nut "Torque Spec"
#7
m.s.macrae Murray MacRae
Wellington, Wellington, New Zealand   NZL
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1968 MG MGC
1994 Subaru Impreza WRX
2000 Subaru Outback "A Bit Of A Dog"
2008 Mazda 6
a pry bar against the ring gear with the starter removed?
Just a thought.
Murray

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