I'm replacing my under drive pulleys......i cant get my harmonic balancer bolt off. my elec impact wrench coulndt take it off. anyone have any suggestions??

 

Use a breaker bar and a socket. Rest the breaker bar against the frame or the ground or something solid. Remember that the engine turns clockwise. Crank the truck for a second but dont let it start (you may want to pull the efi fuse). The torque from the starter will loosen the bolt for you. When you put the bolt back in remember to torque the bolt to spec. On most vehicles you can run the bolt in with an impact but on the modular motors it will warp the crank sensor plate and cause misfire codes.

-Jon

 

yeah, we toyed with that idea, but then how do I torque it to spec if I had to use such an abstract method to loosen it. I purchased an elec impact wrench from sears and i think it aint powerful enough to break it. The instruction says to torque it 75 ft/lbs. Could that be done with my freind holding it while i torque?

 

i got them installed now i get jerky throttle response.

 

What did you use to tighten it?

JMC

 

an air impact gun. 18mm socket.
the mechanic who was watching me said thats how he always does it for automatics.

 

Here is how you are supposed to do it......

Using a new crankshaft pulley bolt, install the crankshaft pulley bolt and washer. Using the special tool to hold the crankshaft pulley, tighten the bolt in four stages:
Stage 1: Tighten the bolt to 90 Nm (66 lb-ft).
Stage 2: Loosen the bolt one full turn.
Stage 3: Tighten the bolt to 50 Nm (37 lb-ft).
Stage 4: Tighten the bolt an additional 90 degrees.


JMC

PS Any idea what the torque was that you excerted on the bolt?

 

i dont know how much torque I put on it. do you think that might be what it is?

 

HI!... Sounds to me like YOU f#%^#D up your truck. The pullies are a easy 30 minute install and will not effect your timing AT ALL. While installing them you must of disconnected a wire harness or pulled a wire/sensor by mistake. Just go over everything on the truck to make sure all vacuum lines/sensors/harnesses are plugged in and working. Did you perhaps reroute the belt wrong on the pullies. There is another WRONG way to route the belt on the modulars that looks right but actually will spin one the acceseries the wrong way.

 

sounds to me like its ****ed up too.
but nothing that i did. I've looked throughout my entire engine bay to see if I accidentally disconnected something. nothing disconnected.
Do you think it could be because I dont have the fan shroud installed? I highly doubt that though.