Crank Pulley

[Montezuma]

The crank pulley on our 78 280Z is wobbling. Everything was fine but today when the kid drove it home, it was making a clanging sound. I was able to see why very quickly. The front pulley is good but the rear that is closest to the block is the one that is wobbling. Ideas and fixes?

[Curtis240Z]

You need a new one. The rear one is usually part of the vibration damper which is held in place by a rubber interface. If the rubber fails you need to replace the damper. MSA sells a new performance damper that is a good deal.

[Montezuma]

You need a new one. The rear one is usually part of the vibration damper which is held in place by a rubber interface. If the rubber fails you need to replace the damper. MSA sells a new performance damper that is a good deal.

Aloha,

That's what I thought. I have euro damper in the box in the garage but it will do me no good because the car has A/C. Thanks for confirming my initial thought. Mahalo

[Pop's Z]

David, I have no personal experience with this shop, but he rebuilds harmonic balancers for Zs and Corvairs. www.dalemfg.com/daley_001.htm

He was talked about on another site and they all had good things to say about him. Much cheaper than a new one from MSA. Just my 2cents.

Cheers, Mike

[Montezuma]

Does anyone know what the bolt size on the front of the pulley is?

[Bonzi Lon]

If the 78 is the same as my 73, it is 27mm or 1 1/16 inch.

Bonzi Lon

[sblake01]

I bought one from Nissan about 8 months ago so as far as I know they're still available. Same bolt for all except the earliest L24. 12309-21000 is the bolt and 12308-65000 is the washer. Total was about $9 IIRC.

[Montezuma]

Thank you Bonzi and Steve, I have 27mm spocket in the garage so I am GTG. We plan to reuse the bolt but if it is also defective as was the pulley we will get one from Nissan using the part number listed. I hope this replacement goes well. We got a new factory pulley from MSA, got it for a good price.

Any last minute advice before we tackle the project?

[sblake01]

Pretty straightforward from there, just don't get the 'while I'm at its' like I did. I set out to replace the pulley and then I decided to do the front cover seal and the timing chain tensioner. By the time I was done, I ended up doing a valve job as well since I had ruined the head gasket taking off the front cover.

[Montezuma]

Thanks Steve....everything is off except the pulley itself. I thought I had a good puller...but no, the bolt is too long and don't want to remove the radiator to use it. I am off to find one...Napa...Sears...here I come.