How to Replace Crankshaft Pulley 1988-98 GMC Sierra K1500
Created on: 2017-03-23
How to repair, install, fix, change or replace a broken, noisy, squeaky, worn or groaning serpentine belt tensioneron 96 GMC Sierra K1500 5.7L.
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step 1 :Removing the Fan Shroud
- Unclip the wiring retainer from the fan shroud with a flat blade screwdriver
- Pull the wiring off the fan shroud and set it aside
- Remove the seven 10mm bolts from the fan shroud
- Lift the fan shroud up and out
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step 2 :Removing the Fan Clutch
- Attach an adjustable nut to the fan clutch nut
- Tap the wrench with a hammer to loosen the nut
- Attach a 3/8 inch drive ratchet to the serpentine belt tensioner
- Turn the tensioner as far clockwise as possible
- Tap the adjustable wrench with the hammer again
- Remove the ratchet and the adjustable wrench
- Spin off the fan clutch
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step 3 :Removing the Serpentine Belt
- Familiarize yourself with the route of the serpentine belt
- Insert the 3/8 inch drive ratchet into the tensioner
- Turn the tensioner clockwise to loosen the belt
- Pull the belt off the alternator
- Release the tensioner
- Pull the belt off by hand
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step 4 :Removing the Crankshaft Pulley
- Remove the three 14mm crank pulley bolts
- Remove the 16mm center bolt
- Remove the pulley
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step 5 :Installing the Crankshaft Pulley
- Insert the pulley into the engine
- Tighten the 14mm bolts to the pulley
- Tighten the 16mm center bolt and washer by hand
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step 6 :Installing the Serpentine Belt
- Loop the belt around the crank pulley
- Bring it around the water pump
- Bring it under the power steering pulley
- Bring it around the A/C Pulley
- Bring it around the belt tensioner
- Bring it under the idler pulley
- Pull the tensioner clockwise with the 3/8 inch ratchet
- Pull the belt over the alternator
- Release the tensioner
- Torque the center crankshaft pulley bolt to 74 foot-pounds
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step 7 :Installing the Fan Clutch
- Start the fan clutch nut onto the pulley by hand
- Attach an adjustable nut to the fan clutch nut
- Tap the wrench with a hammer to tighten the nut
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step 8 :Installing the Fan Shroud
- Line up the fan shroud
- Fasten the seven10mm bolts into the fan shroud
- Place the wiring on top of the fan shroud
- Clip the wiring to the fan shroud
Tools needed
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Adjustable Wrench
Hammer
Socket Extensions
Flat Blade Screwdriver
Torque Wrench
3/8 Inch Drive Ratchet
3/8 Inch Impact Gun
Complete Metric Socket Set
Hi, I'm Mike from 1AAuto. We've been selling auto parts for over 30 years! We're dedicated to delivering quality auto parts, expert customer service, and fast and free shipping, all backed by our 100% satisfaction guarantee. So visit us at 1AAuto.com, your trusted source for quality auto parts.
In this video, we're going to be working with our 1996 GMC Sierra K-1500.
We're going to show you how to remove and replace your vehicle's crank shaft pulley. If you like this video, please click subscribe. We have a ton more information on this and many other vehicles. If you ever need parts for your car, you can follow the link down in the description over to 1AAuto.com.
Here are the items you'll need for this repair: full metric socket set, 3/8" ratchet, socket extensions, small flat blade screwdriver, adjustable wrench, hammer, torque wrench, impact gun
Using a small flat blade screwdriver, pop open the wire retainer on the top of your fan shroud, lift the wire off, and it's long enough that you can just lay it back in the engine bay. You can remove it from the battery, and take it out completely, if you'd like to, but this should give you plenty of room to work.
Remove the seven 10 millimeter bolts along the fan shroud. There should be two on the bottom on each side. Ours is missing two bolts, and then three along the top, and the same two bolt locations on this side. We'll remove these with a 10 millimeter socket ratchet and extension. Once the hardware is removed, lift up, and remove the upper fan shroud from the vehicle.
We're going to use an adjustable wrench, because we don't have the right size open-end wrench, but that would work as well. As well as, some pipe wrenches. We're going to place that over the clutch fan nut, and then strike it quickly with a hammer.
Using the drive of a three-eighths ratchet – you could also use a three-eighths breaker bar –, go into the slot on the serpentine belt tensioner, and rotate it as far as we can clockwise, to put some extra tension on the serpentine belt. Then, try hitting the wrench again because this should keep the pulley from turning. Once it's loose, you can remove your ratchet, spin the clutch fan off.
Now use a 3/8 drive ratchet to turn the tensioner counter clockwise and remove our serpentine belt. Make sure you have a belt path for this, either under the hood somewhere. Take a picture or draw one yourself. You don't need to remove your water pump. However, we already had it off and it makes it a lot easier to show you what's going on.
Remove the three 14 millimeter crank pulley bolts. Now these tend to be pretty stuck on there, so you may need to use a strap wrench or something to hold the crank in place, but I found that if you crack them all loose before you remove any of them fully, and you kind of give them a little shock with the ratchet by just giving them a quick little jerk, sometimes you can free them up without needing to remove anything. Once you've cracked all the bolts loose, you can remove them fully.
Now use the 16 millimeter socket, ratchet, and extension to try to break loose the center bolt on the balancer. However, this is really torqued on there, so you may need to use an impact gun or some type of holder to get it off. Now you may be able to use a strap wrench, some kind of holder. If you have a manual transmission, you may be able to just lock it in place, but for us, the easiest method is going to be to break it loose with an impact gun. You can then remove the bolt and pulley from the harmonic balancer.
Reinstall the crank shaft pulley with the three 14 millimeter bolts. Tighten those down with the 14 millimeter socket, ratchet, and extension. Reinstall your 16 millimeter crank bolt and washer. For now, we'll just tighten down the crank bolt as much as we can with the 16 millimeter socket and ratchet. Once we get the belt on, we should have a little more leverage to torque it.
Loop your serpentine belt under the crank pulley. We'll then go under the water pump, around the top, down and under the power steering pump, and over the A/C compressor pulley. On the left, we'll go over the tensioner and over the alternator. We'll then hold down where it will go below the idler pulley.
Using the drive from a 3/8" ratchet, we'll turn the tensioner counter clockwise. Slide the belt under. Take a quick look to make sure everything is aligned. There we go. Put tension back onto our belt. Using your ratchet, put tension on the serpentine belt by rotating the tensioner clockwise. Using your 16 millimeter socket, torque the crank bolt to 74 foot-pounds.
Reinstall the clutch fan and just snug it up by tapping it on with a wrench.
Reinstall your upper radiator fan shroud. Reinstall the seven 10 millimeter bolts secure in your fan shroud. Tighten them down with a 10 millimeter socket and ratchet. Reinstall the wire along the top of your shroud. Lock it back into place.
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