Loose Crankshaft Pulley

[daredevil95]

Hi, I have a 86 GN, I recently changed my waterpump, removed the intercooler and intercool small fan on crankshaft serpentine belt pulley. As i was reassembling and i went to install the intercooler small fan onto the crankshaft pulley, the fan connects to the serpentine belt pulley and I noticed this serpentine pulley was loose....I could slide it back and forth about an 1//8" to 1/4" of movement...i don't remember this movement being here in the past? I could be wrong? Motor was rebuilt about 2 years ago and a new harmonic balancer was installed so, Is the movement with the serpentine pulley normal? or should i replace or maybe tack weld in place?

 

[turbohh]

DM sent about a good used RJC pulley I have if you decide to replace ...
John A, Turbohh

 

[WE2Regal]

You can see a bolt missing from the crankshaft pulley. Better check to make sure you have all of them in and tight. Also make sure the balancer bolt is tight. You'll have to remove the intercooler fan to check it.

 

[pacecarta]

^ as he said the pulley is held on the crankshaft hub with 6 bolts , three were from the fan and you removed them and as your pic shows at least two of the pulley bolts are missing maybe all three , replace the missing bolts (m8x125 x16mm) and forget the welding idea

 

[pacecarta]

and considering the bolts are missing and may have fallen out from improper torque and as you said your balancer was replaced , as has been posted by we2regal ..pull the fan and reach in and check the large crank bolt ( should be torqued to 225lb/ft) and while you're there check the 6 bolts (1/2" head 5/16-18 x 1.00) that hold the hub to the balancer

 

[BEATAV8]

If it’s just the pulley that’s loose then just tighten it up.
More likely the balancer is loose. If so it’d be best to remove it and inspect it. Look for cracks in the key way. Inspect crank sensor and reluctor wheel.

 

[daredevil95]

Mannnn....I didn't notice the 3 missing bolts! Yes, they were there prior to engine rebuild., I looked up a pic I had from when I removed engine. Now that I'm looking at it, I'm not sure what those bolts do but, I will install them today. Thanks, The engine has a new harmonic balancer and engine builder installed that 200lb+ balancer bolt and I will check it out. Thanks for the feedback. I appreciate it.

The bolts were there!

 

[daredevil95]

If it’s just the pulley that’s loose then just tighten it up.
More likely the balancer is loose. If so it’d be best to remove it and inspect it. Look for cracks in the key way. Inspect crank sensor and reluctor wheel.

It is actually the Pulley itself is loose on the hub that connects to the crank. The bolts inside the hub connecting to the crank are tight. Although I'm missing bolts on pulley so, that may lock it down? IDK? I'm tryting to figure out how that works.

 

[daredevil95]

and considering the bolts are missing and may have fallen out from improper torque and as you said your balancer was replaced , as has been posted by we2regal ..pull the fan and reach in and check the large crank bolt ( should be torqued to 225lb/ft) and while you're there check the 6 bolts (1/2" head 5/16-18 x 1.00) that hold the hub to the balancer

Hi, do you know the size of the missing pulley bolts? I'm still google researching for size? Ill stop today and pick up new bolts vs digging through my bolt drawers for more time then I would like to spend sifting. lol

 

[outatime86]

Hi, do you know the size of the missing pulley bolts? I'm still google researching for size? Ill stop today and pick up new bolts vs digging through my bolt drawers for more time then I would like to spend sifting. lol

Post #5

 

[pacecarta]

actually i posted in #4 (m8x1.25x16mm, he was missing the fan (can see the flange marks ) and its bolts in the pic at post #7, must have used the three that are in the pic after the rebuild

 

[outatime86]

Nicely done!

 

[pacecarta]

Mannnn....I didn't notice the 3 missing bolts! Yes, they were there prior to engine rebuild., I looked up a pic I had from when I removed engine. Now that I'm looking at it, I'm not sure what those bolts do but,

The bolts were there!

in this post you say you're not sure what those bolts do
the serpentine pulley is steel and the hub is cast iron, to make that you need two separate parts and the 6 bolts hold the pulley ring onto the hub
in the pic you posted of the motor before rebuild there are three missing bolts ..those were holding the fan on (can see marks from fan flange) the other three bolts in pic were still holding the pulley on the hub
i dont see the mystery as to why you'd say they were there when the pic shows they werent when it went to rebuild