Torque spec for LH thread oil pump worm gear nut (2008)

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Hello, I looking for information regarding a torque spec for the big LH thread oil pump worm gear nut that screws onto the timing end of the crankshaft. Old Britts website says, "Oil pump worm gear/nut (06-7889, LH thread) 15 ft lb". But that seems so low! Maybe torgue needs to be low to prevent distorting the triangle shaped backplate under the pinion gear?
 
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Jim, I think 15 ft-lbs is far too low. I usually do them up with a decent size knuckle bar to what I think is reasonable. I would guestimate about 50 ft-lbs.
 

L.A.B.

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As it is L/H thread, then the normal clockwise rotation of the crankshaft (when viewed from the R/H side) should prevent it from loosening off anyway?
 
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L.A.B., Yes, but I have an ulterior motive. I don't know why, but my timing pinion gear is only a very light press fit to the crank nose. So I want to put plenty of torque on the oil pump nut to make sure the pinion is clamped good and solid. However, it looks to me like if I go overboard with torque, I could make the triangular shaped backplate go saucer shaped!
 
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Jim, The triangular plate is a solid piece so don't worry about bending it with clamping force. It is just a spacer, but is triangular to allow the fitting of the legs of the crank pinion special puller for dissasembly.
 

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JimP said:
However, it looks to me like if I go overboard with torque, I could make the triangular shaped backplate go saucer shaped!

As Dave M has said you wouldn't damage the triangular spacer by applying some extra torque, and I would agree that 15 ft/lb is a bit low.
 

concours

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So, was there ever a number agreed upon? I see none published, and a narrow hex, points to good-n-tight, not crazy tight.
 

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My torque wrench says not to be used for undoing nuts, so how do you torque a left hand thread?
 

concours

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I’ve tightened it using experienced, 16oz. calibrated elbow. :cool:
Thanks.
 
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