front crank bolt and key

[allisue]

I have just got to my crankshaft pulley and there is no "key" or bolt there. The pulley was just spinning. My question is: What size bolt and key is this? I have a 50 8n front mount 6v. The pulley is cracked where the notch is. Next question: Can I get these at O"Reilly"s or NAPA or must I order them. Anyone know who might have pulley, bolt, and key without going to 3 different places. Any other advice about putting this back on also. Thanks, Allisue

 

[Dell (WA)]

Allisue........the woodruff "key" is p/n: 74156-S, 1/4x1-1/8.

Gitt ridd of that flimsy sheetmetal front pulley and gitt a real solid billet replacement pulley for frontmount hydraulic pumps like illustrated. $50 (cheap)

The pulley won't accept the "crownhead" bolt, so just use a 5/8-18x1" grade 8 finethread bolt, use a flat washer, torqued to 150ft/lbs.

Tip: stuff some soft 1/4" rope down enny sparkie hole to keep the crankshaft from doin' a full 360 by squashin' the rope against the cylinderhead. Torque 150ft/lbs.

 

[allisue]

Thanks for the help.

 

[Danny in CO]

All,

This site has the pulley. See the link below. The bolt and woodruff key are easy to find at most parts houses.

Danny
YT Pulley

 

[Hobo,NC]

The key can ONLY B replaced if you take the whole front off the engine,,,, drop the pan and remove the front crank gear,,, lovely ain't it...

I would git the replacement pulley,,, Hope it fits the snout of the crank sorta good,,, test fit it to see if it would bite the key that retains the front crank gear,,, if it fells OK index the key to the new pulley for the install

I would then use the OEM brank bolt but first counter bore the center of the new pulley to accept the taper on the OEM bolt OR git me a new 5/8'X 1" find thread bolt grade 5 or 8 and nail it,,, course i would put some sealer or locktight on the I.D. of the new pulley so it don't leak.

You are gonna have to remove the front axle and support enny way you go,,,,your call if the key is still good,,, its not much more work to git a good look at it,,, If usable thats great,,, if worn out then the job gits nasty

Pix will show ya taint much to werk with