Problem Removing Lower Fork Leg

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Bikes: 1955 FLH Harley Davidson and 1945 LE sidecar, 1954 R68 BMW, 1979 HD FXEF.
Location: Mass.

Problem Removing Lower Fork Leg

#1

Post by parts » Tue May 15, 2018 1:19 pm

Good Morning, I am trying to change my fork seals on my 1979 FXEF. The socket head cap screw that goes up into the dampener rod, which must be removed to take off the lower legs, just spins when I try to loosen it. This is the screw that you get to after removing the axle. Is there a trick to this.
Why does the dampener inside turn? Is it related to how much pressure is coming down onto it from the fork spring?
Thanks, Tom from Mass



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Re: Problem Removing Lower Fork Leg

#2

Post by RUBONE » Tue May 15, 2018 1:46 pm

As you guessed the damper is not locked in position by anything other than friction. The best way to remove it is an air impact to jar the fastener and get it to loosen. I've had one that I removed the spring and inserted a wooden dowel in the leg holding it upside down on the floor to apply pressure as an impact was applied to break it loose.

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Re: Problem Removing Lower Fork Leg

#3

Post by FL54 » Tue May 15, 2018 2:01 pm

Tom, there are videos on YouTube that take you step by step through the process. If memory serves, you use an impact to remove that nut to eliminate the spinning issue.

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Re: Problem Removing Lower Fork Leg

#4

Post by FL54 » Tue May 15, 2018 2:04 pm

Didn't see Robbie's post. I was trying to find the link to the video.

parts
Posts: 14
Joined: Thu Jun 28, 2012 12:44 pm
Bikes: 1955 FLH Harley Davidson and 1945 LE sidecar, 1954 R68 BMW, 1979 HD FXEF.
Location: Mass.

Re: Problem Removing Lower Fork Leg

#5

Post by parts » Tue May 15, 2018 2:28 pm

Hi everyone, Thanks for the suggestions. I will try using the wood dowel to increase the friction and use the air impact to try to break it loose. The air impact alone has not done the trick so far. I don't have time to try again until Wednesday evening, so will get back with the results after that.
Thanks again, Tom

parts
Posts: 14
Joined: Thu Jun 28, 2012 12:44 pm
Bikes: 1955 FLH Harley Davidson and 1945 LE sidecar, 1954 R68 BMW, 1979 HD FXEF.
Location: Mass.

Re: Problem Removing Lower Fork Leg

#6

Post by parts » Thu May 17, 2018 5:35 pm

Hello again, So last evening I finished up the fork seal replacement on my 1979FXEF. Taking the advice I got here I made a special tool to hold the dampener rod while loosening and tightening the stubborn screws. I cut a 3/4 inch diameter aluminum rod 19.5 inches long and tapped a 1/4-20 hole in one end. I put this rod into the top of the fork in place of the spring and snugged down on the big fork cap screw( but not too much). This holds the inner rod firmly and allows loosening and tightening of the bottom screw. I did not even need to use the air impact. The threaded hole allowed me to retrieve the rod without flipping the bike upside down. Another tool for the "special tools" box. Thanks for the suggestions. Tom from Mass.

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