how to replace throttle shaft bushings

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Moose
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how to replace throttle shaft bushings

#1

Post by Moose »

can anyone tell me how to get the old throttle shaft bushings out and new ones in on a m74

thanks
FlatHeadSix
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Re: how to replace throttle shaft bushings

#2

Post by FlatHeadSix »

Its easy Glenn, you can do it in your mailbox! :wink:

seriously, I have never tried to do one myself. I send them to Cotten, he knows what he's doing, and they come back like brand new.

mike
indianut
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Re: how to replace throttle shaft bushings

#3

Post by indianut »

Just screw a Tap into them and pull them out. They are not in that tight. Then push the new ones in and, Ideally, Hone them on your Sunnen. Or do it by hand.
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Re: how to replace throttle shaft bushings

#4

Post by Cotten »

Moose!

As per Palmer's,
the bushings can be removed by turning a sacrificial M7x1 tap into each one, and drifting it out from the other side.

Installation requires cleaning and inspection of the casting bores,
choosing bushings of an appropriate press-fit,
lubeing them,
and then pressing them in while aligned with a ground shaft and precision-bore pucks as shown.
THRTLTUL.jpg
The bushing should be pressed no farther than flush, and left proud if there is apparent wear on the thrust surface around the bore.

Beware that not all casting's bushing bores are aligned to each other, as many have been distorted by over-torquing.

....Cotten
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PanPal
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Re: how to replace throttle shaft bushings

#5

Post by PanPal »

How's the shaft look? I thought I needed bushings but a new shaft was all that was needed.
Moose
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Re: how to replace throttle shaft bushings

#6

Post by Moose »

I have a new shaft but the lower bushing is too loose


how much clearance should be between the shaft and the bushing
Cotten
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Re: how to replace throttle shaft bushings

#7

Post by Cotten »

Moose!

A little as possible without bind.

....Cotten
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