Dual Sleeve Crank Pulley Question

[60s Refugee]

I am adding a bolt on second sleeve (pulley) to the crank pulley. When I took the dampner/crank pulley off, there was a big thick washer under the bolt that filled the entire recessed spot there the bold goes in. The washer makes sense there because otherwise there would be nothing for the bolt to pull tight against. The bolt on second pulley fits into the place where that washer was, and as most of you know, is secured by three bolts. There is a 9/16" hole for the crank bolt to go through in the center, but no machining to accomodate a washer. A bolt tightened there would secure the assembly without needing that big washer.

Question, does the second pulley constitute the washer and the crank bolt go in without any? I presume it will need a longer bolt since the thickness of the second pulley is about 3/8".

Harry

 

[aribert]

I read your post a few days ago and went to look at a '66 200 engine that I have that had the 2nd, bolt on pulley sheeve. This setup appears to be from a stock (w/ A/C) Mustang. In this case the dampener mtg bolt had a 1.5 dia washer and the second sheeve had a 1.625 ID bore.

Now that I have reread your post, I seem to remember having the same issue when adding a 2nd sheeve onto the harmonic balancer on my '61 170 Falcon. Tomorrow I will be stopping by my workshop garage (10 miles from home, can't just walk out back and have a look) and have a look under the hood of my Falcon to confirm that I did what you are contemplating. I'll post again on what I did.

 

[60s Refugee]

Thanks!

 

[aribert]

Confirmed, I did what you are planning on doing. Engine is still in my Falcon and the clearance to the radiator is not that great so it was a bit hard holding a flashlight, inspection mirror and calipers but the washer that I used appears to be about 1.75 in. in dia. Make sure that it is a hardened washer and I would suggest a grade 8 bolt. If you do not have good hardware sources, you can order on-line at McMaster-Carr (they have almost everything industrial)

 

[60s Refugee]

Thanks. I still have the washer that was on the single. I have a new bolt too, but it has a shoulder that is too long. I'll run a tap down it and trim it off to make it the right longer length.

I wonder why they didn't use lock washers too? Same with the cam bolt, no lock washer.

Harry

 

[mustang6]

Lock washers are not needed in the ends of rotating items moving in the right direction related to the threads. The rotation makes them self-tightening.