i have been having some problems with my crank pulley in the last 6 months it has come off twice i redid it today after it came off two days ago does anyone know why it might be doing this i checked every thing out and nothing seems to be worn out or broken and i have been torqing it down with the correct torque using a torque wrench.

 

put a little thread lock on

 

cool will do do you know offany reason why it might be popping off

 

Could be vibration, but most likely an issue in the stack up of parts during assembly and it's not tightening up correctly. OR, it's not getting tightened up correctly/enough.

I would remove it and loosen up the belt and see if the lower sprocket will come off if it without using a puller - remove and inspect it and the key.

Check out the key for the lower pulley too. Also, is it (pulley) turning true with engine running?

If you do opt for Thread Locker - Clean up the internal threads on the end of crank with a Q-Tip cotton swab and rubbing alchohol or shoot it with some brake cleaner - keep it off the seal and pan gasket. Clean the bolt the same way and use a small amount of BLUE thread locker such as Loctite 242. DO NOT USE RED OR YELLOW.

Whenever using thread locker, the thread surfaces must be clean for it to work properly.

I always have trouble torquing the lower pulley bolt with a torque wrench - keeping the engine from turning over. For the past several years I have used a 3/8" drive impact gun. I know this gun at 100 psi and the **** on bottom of handle set to #2 puts ~70 ft lbs on something if your hammer it for a second or two after it pulls tight. I give it a few more raps than the lug bolts get - prolly 100 ft lbs. Used it on wheel lugs enough times with wheels jacked off ground only to be followed with torque wrench set to 70 ft lbs after I set it down. It's pretty close.

Honestly, it shouldn't be coming loose. Make sure the keys and keyway isn't dorked up. I suspect something is wrong with the mechanical stack up and parts interface.

Also, check bolt with pulley off to ensure it threads all the way up past where it will interface with pulley. Should go in by hand. Use anit-sieze on threads to ensure proper torque is achieved.

Book says 119 ft lbs is the number. I can't imagine that bolt backing out with that much grunt on it.

What happens when "It comes off"? Does it actually fall off? I can't imagine it's in very good shape if it has done this a couple of times. Maybe you need to make a trip to junk yard and get another one? How well does it fit up on the end fo crankshaft? AT 119 ft lbs if torqued up and fit properly, it shouldn't EVER spin loose.

 

i thought it was because the way the engine turns makes the bolt loose?

 

Morning bro.

Viewed from pulley end, drivers side. Pulley (crankshaft) rotates anti-clockwise. Bolt turns clockwise to tighten. Standard engineering protocols for rotating shafts. Everything from lawn mower blades to electric fans do it that way.

 

I stand corrected