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Putting bushings in ductile iron rockers? #1479950
08/05/13 09:40 AM 08/05/13 09:40 AM
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Kentucky
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vern73 Offline OP
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Anyone ever done this or had it done? I have a set of 1.6 Cranes I hate to get rid of but they are galled some on the bottom. I am a machinist by trade but wouldn't know which bushings to order. Thanks
Re: Putting bushings in ductile iron rockers? [Re: vern73] #1479951
08/05/13 09:59 AM 08/05/13 09:59 AM
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usa
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lewtot184 Offline
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i was thinking RAS or Drovak did the bushing thing. basically they put a .875 o.d.- .75 i.d. bronze bushing in the rocker and use a .750" shaft with some spacers to go between the shafts and shaft stands. being a machinist it wouldn't be difficult for you to fab your own set up. the only issue i see is choice of shaft material for strength and being compatible with the bronze.
Re: Putting bushings in ductile iron rockers? [Re: lewtot184] #1479952
08/05/13 10:29 AM 08/05/13 10:29 AM
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U.S.S.A.
JohnRR Offline
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I think it's that Dvorak sells the kit that downsizes the ID, RAS bores out the rockers and installs a bushing that fits the stock shaft. RAS will also correct any geometry issues.
Re: Putting bushings in ductile iron rockers? [Re: lewtot184] #1479953
08/05/13 10:30 AM 08/05/13 10:30 AM
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Ontario, Canada
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Stanton Offline
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You hone the rocker to close to .936. You press in a .936 o.d. x .062 wall bushing and hone it to size. What you end up with is a bushing with about a .030 wall.

You don't use thin shafts ... for all that effort and expense you could buy the most expensive rockers on the market and still be ahead!!
Re: Putting bushings in ductile iron rockers? [Re: vern73] #1479954
08/05/13 01:07 PM 08/05/13 01:07 PM
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Canada
WO23Coronet Offline
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If you're going to bore the rockers out, what would you use as a reference to keep everything square? I have a set of Crane 1.5's that are galled and have been considering doing the same thing. I was thinking of using the adjuster nut hole to hold it in a jig, and then dialing in the bore and then clamping it? Does anyone know how Dvorak and RAS does it?
Re: Putting bushings in ductile iron rockers? [Re: WO23Coronet] #1479955
08/05/13 01:20 PM 08/05/13 01:20 PM
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usa
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lewtot184 Offline
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i talked to Drovak about this several years ago and my impression was that his kit bushed the rocker and down sized the shaft.
Re: Putting bushings in ductile iron rockers? [Re: lewtot184] #1479956
08/05/13 02:04 PM 08/05/13 02:04 PM
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JohnRR Offline
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Quote:

i talked to Drovak about this several years ago and my impression was that his kit bushed the rocker and down sized the shaft.



That is what it does
Re: Putting bushings in ductile iron rockers? [Re: vern73] #1479957
08/05/13 03:00 PM 08/05/13 03:00 PM
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Rio Linda, CA
John_Kunkel Offline
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These guys bush the rocker arms and maintain the original shaft size.

http://www.rockerarms.com/pages/about.html

I've seen their work and it's first class.

The INTERNET, the MISinformation superhighway
Re: Putting bushings in ductile iron rockers? [Re: WO23Coronet] #1479958
08/05/13 07:16 PM 08/05/13 07:16 PM
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Ontario, Canada
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Stanton Offline
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Quote:

If you're going to bore the rockers out, what would you use as a reference to keep everything square?



"bore" is probably the wrong term to use. You would either ream them or hone them out. Either way, it would be self-centering on the current bore. If you want to get into optimizing the ratio ... well, good luck with that.
Re: Putting bushings in ductile iron rockers? [Re: JohnRR] #1479959
08/05/13 10:37 PM 08/05/13 10:37 PM
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South Coast of Oregon
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dweller Offline
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Quote:

I think it's that Dvorak sells the kit that downsizes the ID, RAS bores out the rockers and installs a bushing that fits the stock shaft. RAS will also correct any geometry issues.



My RAS bushed rockers run undersized shafts...
Re: Putting bushings in ductile iron rockers? [Re: dweller] #1479960
08/06/13 12:52 AM 08/06/13 12:52 AM
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U.S.S.A.
JohnRR Offline
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Quote:

Quote:

I think it's that Dvorak sells the kit that downsizes the ID, RAS bores out the rockers and installs a bushing that fits the stock shaft. RAS will also correct any geometry issues.



My RAS bushed rockers run undersized shafts...



When were yours done ? The set I have that I bought off a member back in June of 2011 have stock size shafts, they are cranes, I just looked at them.
Re: Putting bushings in ductile iron rockers? [Re: Stanton] #1479961
08/06/13 11:06 AM 08/06/13 11:06 AM
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Canada
WO23Coronet Offline
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Quote:

Quote:

If you're going to bore the rockers out, what would you use as a reference to keep everything square?



"bore" is probably the wrong term to use. You would either ream them or hone them out. Either way, it would be self-centering on the current bore. If you want to get into optimizing the ratio ... well, good luck with that.



When I said bore I meant "material removal". Boring .030" using a boring head on a mill is easy. You could also use a reamer, but if your hole is off or crooked compared to the rest of the rocker a reamer won't fix that, it'll follow the existing hole, whereas a single point tool in a boring head won't, it will cut true. Good luck honing .060" out, hope you have alot of time to waste on your hands.
Re: Putting bushings in ductile iron rockers? [Re: WO23Coronet] #1479962
08/08/13 08:15 AM 08/08/13 08:15 AM
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Kentucky
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vern73 Offline OP
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I tried the rockerarms.com web site and it wouldn't come up. I would like to know where to get the bushings mentioned above .938 diameter and try it myself. What kind of material would they need to be? Or if anyone knows how to contact the rockerarms.com business let me know please.
Re: Putting bushings in ductile iron rockers? [Re: vern73] #1479963
08/08/13 09:43 AM 08/08/13 09:43 AM
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
Dodgem Offline
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Last edited by Dodgem; 08/08/13 09:47 AM.
Re: Putting bushings in ductile iron rockers? [Re: Dodgem] #1479964
08/08/13 10:48 AM 08/08/13 10:48 AM
Joined: Oct 2005
Posts: 8,872
Ontario, Canada
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Stanton Offline
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Stanton  Offline
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Ontario, Canada
Quote:

Quote:

Quote:

If you're going to bore the rockers out, what would you use as a reference to keep everything square?



"bore" is probably the wrong term to use. You would either ream them or hone them out. Either way, it would be self-centering on the current bore. If you want to get into optimizing the ratio ... well, good luck with that.



When I said bore I meant "material removal". Boring .030" using a boring head on a mill is easy. You could also use a reamer, but if your hole is off or crooked compared to the rest of the rocker a reamer won't fix that, it'll follow the existing hole, whereas a single point tool in a boring head won't, it will cut true. Good luck honing .060" out, hope you have alot of time to waste on your hands.



I think building a jig and trying to correct geometry would be a much greater waste of time. In the end you'll just be older with a little more self-satisfaction but no performance gain. And you'd be surprised how fast a hone will cut those cast rockers !!!
Re: Putting bushings in ductile iron rockers? [Re: vern73] #1479965
08/08/13 01:04 PM 08/08/13 01:04 PM
Joined: Jan 2003
Posts: 5,894
Florida
Locomotion Offline
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Florida
I got a set done by RAS, maybe about 10 years ago. The rockers are bushed down and run on smaller shafts. They did this to maintain the strength of the rockers. They tend to break with higher spring pressures when bored out for a bushing or the body under the tip is relieved for clearance. I think they are 273 rockers. I don't know how accurate of a job they did with the ratio. But I switched to Harland Sharp roller rockers because they became legal.
Re: Putting bushings in ductile iron rockers? [Re: Locomotion] #1479966
08/08/13 08:50 PM 08/08/13 08:50 PM
Joined: Feb 2005
Posts: 4,313
Prospect, PA
BSB67 Offline
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Prospect, PA
My RAS bushed rockers are on a smaller dia. shaft.
Re: Putting bushings in ductile iron rockers? [Re: BSB67] #1479967
08/09/13 07:31 AM 08/09/13 07:31 AM
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Posts: 926
MICHIGAN
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BB65Barracuda Offline
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MICHIGAN
Talk with Cab Burge, I know he does this.
Im sending him a few of my old rockers so he can bush them for something he is presently working on.

1957 Power wagon wm300 original 10.000 mile truck, 1964 dodge Polara Convertible numbers matching

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