pilot bushing help
Thread Starter
Pro
Joined: Jan 2003
Posts: 528
Likes: 5
From: Templeton Ca
pilot bushing help
I just finished pounding a brass pilot bushing into my crank . It had to sit in the freezer overnight to get it in and now it won't budge further and has about an 1/8 in to go until flush with the crank . Is it in far enough ?
Race Director
Joined: Dec 2004
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From: PARADISE
St. Jude Donor '09-'11-'12-'13-'14
Flush with what part of the crank? Is the bushing bottomed out in the hole? Post a photo if you can.
Thread Starter
Pro
Joined: Jan 2003
Posts: 528
Likes: 5
From: Templeton Ca
pilot bushing
I think it should be flush with the edge of the hole in the crank ,but it sits up about 1/8 inch . There seems to be a little more depth left in the hole but the bushing won't move now and is beginning to distort .
Le Mans Master
Joined: Nov 2000
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From: Going too fast over the hill. Iowa
IMO the only way to be positive, is to mount the bellhousing and measure the distance to the transmission's mounting face, which you can compare to the distance from the face of the transmission to the input shaft bushing surface.
Race Director
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From: Canada's capital
2020 Corvette of the Year Finalist (appearance mods)
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I take it you didn't measure it against the old one for width and depth? I never had to freeze one and they went it fairly easy on an old input shaft. You better be sure before you put it all together.
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Le Mans Master
Joined: Nov 2008
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From: columbus oh
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Drifting
Joined: Feb 1999
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From: Cloud 10, Pangea
Instructor
Joined: Jan 2007
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From: Southern, Ontario
You could tap the pilot bushing with a 5/8 nc tap and jack it out with a bolt. See what the problem is . Chances are the pilot bearing has collapsed. Try the tranny input shaft in the bushing to see if its damaged.
Pro
Joined: Nov 2009
Posts: 667
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From: Milpitas Calyfornua
Where did you get this bushing and what is the part number? Perhaps is the wrong one for your crank. An ill fitment can cause a wide range of problems from unexplainable drive line vibrations to clutch chatter to damaging front transmission main shaft gear bearing, to gear clashing when shifting. I think that i would likely start over before moving forward with buttoning it up.
Safety Car
Joined: Feb 2003
Posts: 4,068
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From: St. Joseph Mo
Bushing bore is way too big for 11 tpi. Closer to tap drill size for 18 tpi. More thread engagement.
Last edited by 67L36Driver; Mar 1, 2010 at 11:25 AM.
Drifting
Joined: May 2006
Posts: 1,469
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From: Southold New York
1) You shouldn't have to pound it in
2) It should be flush with the end of the crankshaft
3) If it has begun to distort it is already toast. Take it out and start over with the correct part.
2) It should be flush with the end of the crankshaft
3) If it has begun to distort it is already toast. Take it out and start over with the correct part.
Team Owner
Joined: Aug 2007
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Army
Having to freeze a bushing and then pounding it in is certainly not normal.....
Race Director
Joined: Mar 2009
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From: Canada's capital
2020 Corvette of the Year Finalist (appearance mods)
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You should take it out and check it anyway. Use the old mechanics trick of packing the hole with heavy grease (wheel bearing) and using an old input shaft or anything of same diameter, start tapping it into the hole, put in more grease as you need it, and amazingly the grease pushes out the bushing. Then get the right one!
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