Pulley Problem

[Zlishous]

Hi all,

I have a pulley problem. On the crankshaft pulley there are three grooves for belts. The front two i assume are for power steering and A.C. which are no longer on my car, so obviously there are no belts in those two grooves. My front pulley has come loose, how doi either A) take it off or B)tighten it back up and what do i use to (tool wise) to do it. I was going to replace my fan anyway so would this be a good time to do that? Do i need to pull radiator to do that? Sorry for all the basic questions, i just need a little guidance, i know i can do these things, just don't know how!

Thanks,

Zlish

[Bambikiller240]

Zlish:

Whatever you do, DO NOT continue to drive the car with the pulley loose. You run the risk of it coming completely adrift, and it will drift right into your radiator, fan and waterpump destroying at least the radiator and probably all three.

On my 72 240Z the pulley is held on by a large bolt (30mm as I recall). I suspect that it is the same size on a 260Z. On my car I do not need to remove the radiator to tighten, or loosen the bolt, nor to remove the fan. It is close quarters there, but you just have to watch out for your knuckles on the radiator fins.

The torque value is quite HIGH for this bolt (sorry, I don't have my shop manuals at home to give you the spec) so you may need an extension on a torque wrench to get it right.

Good Luck!

[2ManyZs]

Torque is 116-130ft/lbs.

As stated, don't drive it until you get it fixed.

[kmack]

I have the same setup on my 240. 3 groove pulley with only one groove being used. On mine, there are 2 10mm hex-head bolt holding the outer 2 grooves onto the main pulley, along with the main crank bolt which holds all 3. To remove the outer 2 grooves, you'll need to pull out the 2 smaller bolts, then remove the big crank bolt (the one with the high torque value).

Just for reference, the crank bolt head size is big. I used 1-1/16" socket to get mine off. But I also used an impact wrench.

[Bambikiller240]

From what I've been told, on 240Z's, the One groove pulleys are EURO spec (no smog pump) Two groove pulleys are normal for US spec 240Z's. I have a extra engine from another 72 that has a TWO groove factory pulley, and ONE extra groove mounted (as kmack describes) to accomodate the aftermarket a/c added by dealers. (no factory a/c was available back then)

[Zlishous]

Thanks guys, lots of good advice there! Don't worry, me no drivey till fixey.

Thanks again,

Paul

[Marty Rogan]

In addition to getting the tension correct on that big bolt, there may be another issue at fault in the first place. The pulley is kept from spinning on the bolt by a key slot, that I belive goes into the crank. If the key slot retainer pin breaks and falls out, the pulley can spin. I would suggest you remove the pulley and make sure the key slot retainer is still there. If it is missing, you should be able to get one from the dealer.

Good luck,

Marty