Houston I think we have a problem. I went to install the pilot busing in the end of the crankshaft and it slid in with no interference. The pilot bushing measures 1.095" but the hole appears to be approximately 1.117". I used a socket to approximate it since the calipers wouldn't reach. Are there any solutions short of replacing the crank?
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Re: C1 Pilot Bushing Problem
ted------
Usually, the problem involves cranks with a slightly smaller pilot bushing bore than the standard size or, in some cases, a much larger pilot bushing bore size (cranks originally used for Turboglide applications). For those situations, Dorman offers special adapter pilot bushings. However, I don't think that they offer one for your bore size.
What you could do, though, is to obtain the Dorman Turboglide adapter bushing, Dorman #690-035 which has an OD of 1.722" and have it machined down to the OD you need.In Appreciation of John Hinckley -
Re: C1 Pilot Bushing Problem
ted------
Usually, the problem involves cranks with a slightly smaller pilot bushing bore than the standard size or, in some cases, a much larger pilot bushing bore size (cranks originally used for Turboglide applications). For those situations, Dorman offers special adapter pilot bushings. However, I don't think that they offer one for your bore size.
What you could do, though, is to obtain the Dorman Turboglide adapter bushing, Dorman #690-035 which has an OD of 1.722" and have it machined down to the OD you need.In Appreciation of John HinckleyComment
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Re: C1 Pilot Bushing Problem
Thanks Joe, This is on a '58 283 (don't know the history of the crank). I just measured again and the socket that fits tight is 1.115" so I'd gues it's around 1.117". The surface has some grooves in it so maybe someone spun a bearing. I wonder if I get one in if I'd ever be able to get it back out. Thoughts?
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Re: C1 Pilot Bushing Problem
Thanks Joe, This is on a '58 283 (don't know the history of the crank). I just measured again and the socket that fits tight is 1.115" so I'd gues it's around 1.117". The surface has some grooves in it so maybe someone spun a bearing. I wonder if I get one in if I'd ever be able to get it back out. Thoughts?
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Re: C1 Pilot Bushing Problem
you just use a 5/8"-11 tap. thread it into the pilot hole and just keep turning till the bushing is forced out caused by the tap bottoming out on the crank pilot bushing boreComment
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Re: C1 Pilot Bushing Problem
you just use a 5/8"-11 tap. thread it into the pilot hole and just keep turning till the bushing is forced out caused by the tap bottoming out on the crank pilot bushing boreComment
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Re: C1 Pilot Bushing Problem
Ted,
I had that problem with the 4577 crankshaft in the 63, the bore measured 1.083 so my solution was easier than yours. The standard 1.094 bushing was turned turned to give .002 interference fit and it went together fine. After inspecting the old bushing you could see where it had just been driven in to the crank and peeled the old bushing somewhat. Not what I wanted with my new input shaft!Comment
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Re: C1 Pilot Bushing Problem
Ted,
I had that problem with the 4577 crankshaft in the 63, the bore measured 1.083 so my solution was easier than yours. The standard 1.094 bushing was turned turned to give .002 interference fit and it went together fine. After inspecting the old bushing you could see where it had just been driven in to the crank and peeled the old bushing somewhat. Not what I wanted with my new input shaft!Comment
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Just talked with a guy and he indicates.....
there are about 4 bushings to choose from. He said GM had multiple bushing to accomidate for "mistakes". He said there's one that is a "top hat" bushing that actually had the interference fit with the outside diameter. He's supposed to get me the dimensions on Monday.Comment
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Just talked with a guy and he indicates.....
there are about 4 bushings to choose from. He said GM had multiple bushing to accomidate for "mistakes". He said there's one that is a "top hat" bushing that actually had the interference fit with the outside diameter. He's supposed to get me the dimensions on Monday.Comment
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Re: Just talked with a guy and he indicates.....
Ted......Another way to get the old bushing out is to fill the cavity with grease and insert an old trans input shaft into the hole and use a 2-3 lb. sledge to smack the shaft. I've never seen one so tight that the grease will not pop the bushing right out.....Good luck!.....BradComment
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Re: Just talked with a guy and he indicates.....
Ted......Another way to get the old bushing out is to fill the cavity with grease and insert an old trans input shaft into the hole and use a 2-3 lb. sledge to smack the shaft. I've never seen one so tight that the grease will not pop the bushing right out.....Good luck!.....BradComment
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I've run into this
I've run into this before. There was a 283 truck engine which used a different end & a larger bushing, some were alot shallower than the regular boss. I've also seen a few bushings that spun in the bore & wore it out. So here's what you need to do. Have your parts guy look up a bushing for a Jeep. I usually go with the 66 with a 327 because I can remember it. This is an AMC engine, not a Chevy, it's just a coincidence the Jeep bushing is a hair oversized than the Chevy. (the inner diameter is the same). But this was a very common pilot bushing for AMC/Jeep/Rambler, I think it was used from the 50's Ramblers all the way up into the 70's, maybe 80's, with lots of drivetrain combos. It's gotten me out of a few jams. Of course I have the part number someplace safe where I won't lose it. If you can remember where I put it, let me know. Meantime, the Ram website has a chart that might help.
http://www.ramclutches.com/Products/accessories.htm
By the way, use a bolt to thread the bushing out. If you break that tap trying to force out the old bushing, you've got a bigger headache.Comment
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I've run into this
I've run into this before. There was a 283 truck engine which used a different end & a larger bushing, some were alot shallower than the regular boss. I've also seen a few bushings that spun in the bore & wore it out. So here's what you need to do. Have your parts guy look up a bushing for a Jeep. I usually go with the 66 with a 327 because I can remember it. This is an AMC engine, not a Chevy, it's just a coincidence the Jeep bushing is a hair oversized than the Chevy. (the inner diameter is the same). But this was a very common pilot bushing for AMC/Jeep/Rambler, I think it was used from the 50's Ramblers all the way up into the 70's, maybe 80's, with lots of drivetrain combos. It's gotten me out of a few jams. Of course I have the part number someplace safe where I won't lose it. If you can remember where I put it, let me know. Meantime, the Ram website has a chart that might help.
http://www.ramclutches.com/Products/accessories.htm
By the way, use a bolt to thread the bushing out. If you break that tap trying to force out the old bushing, you've got a bigger headache.Comment
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