Author Topic: fork seal leaking  (Read 907 times)

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Offline eigenvector

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fork seal leaking
« on: July 22, 2015, 04:39:59 PM »
Since my fork rebuild I have noticed that the right fork is leaking - or rather the tube is slick with oil.  Nothing dripping, but clearly it's leaking.

My suspicion is that the spring on the seal got messed up when I drove it into the fork body.  Have new seals on order, but it wasn't what I was expecting to do so soon.  Certainly don't want to ride around with one fork undamped.
Rob
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2018 HD Softail Heritage
1979 CB750K Limited Edition
1977 CB550K
1984 CB700SC Nighthawk
1983 VF750S Sabre

Offline flybox1

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Re: fork seal leaking
« Reply #1 on: July 22, 2015, 04:43:45 PM »
bummer. 
check out that youtube video by hackaweek on fork rebuilds.  he's got some good tips.

Riding with us this Sunday?
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline BobbyR

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Re: fork seal leaking
« Reply #2 on: July 22, 2015, 05:33:08 PM »
One thing you must do is polish the fork tubes. If you can feel something with your fingernail it will cause a leak. It can be a is tedious process, but it pays off in the long run.
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Offline Flyin900

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fork seal leaking
« Reply #3 on: July 22, 2015, 06:30:48 PM »
I have found that using Honda OEM seals rather than aftermarket ones usually has better success with seeping after a rebuild.

I checked out the hack guys rebuild tips and one thing you need to be aware of is the forks must be the same type as what he is rebuilding. If you have a later model fork that uses slider bushings just below the fork seal and down on the bottom of the fork tube where the rebound damper assy is located then a totally different procedure is required.

You would never be able to place the fork seal in the lower fork leg first like he did and still put the fork tube back into the lower leg afterwards. The slider bushings wont allow the fork tube to pass through the seal like it did in his rebuild.
Common sense.....isn't so common!

1966 CL77 - 305cc - Gentleman's Scrambler
1967 CL175K0 - Scrambler #802 engine
1972 CB350F - Candy Bacchus Olive - Super Sport
1973 CB350F - Flake Matador Red - Super Sport
1975 CB400F - Parakeet Yellow - Super Sport
1976 CB400F - Varnish Blue - Super Sport
1976 GL1000 - Goldwing Standard
1978 CB550K - Super Sport
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Offline eigenvector

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Re: fork seal leaking
« Reply #4 on: July 22, 2015, 06:40:40 PM »
It was just my technique I'm sure.  I get my parts from Honda so I don't have to worry about aftermarket imperfections.  I pulled the boot off and yes indeed it is leaking, quite a bit more than I realized actually.  Other fork is perfectly fine, but I refined my technique of putting the seal in after that first one.

Bummer indeed.
Rob
--------------------------------
2018 HD Softail Heritage
1979 CB750K Limited Edition
1977 CB550K
1984 CB700SC Nighthawk
1983 VF750S Sabre

Offline Stev-o

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Re: fork seal leaking
« Reply #5 on: July 23, 2015, 02:39:14 AM »
I use the old seal to drive in the new.
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline eigenvector

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Re: fork seal leaking
« Reply #6 on: July 23, 2015, 05:13:44 PM »
Yeah, that's a pretty good idea really, right size, and who cares if it gets scuffed.

It was one of those "I'm so worn out from trying to pry this old seal loose I just don't give a #@$!" and well - that's why you take a break in between jobs.

Live and learn.

And, sorry Flybox, but the only working bike I have right now is the BMW, so I won't be able to make it.
Rob
--------------------------------
2018 HD Softail Heritage
1979 CB750K Limited Edition
1977 CB550K
1984 CB700SC Nighthawk
1983 VF750S Sabre

Offline flybox1

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Re: fork seal leaking
« Reply #7 on: July 23, 2015, 09:19:12 PM »
Yeah, that's a pretty good idea really, right size, and who cares if it gets scuffed.

It was one of those "I'm so worn out from trying to pry this old seal loose I just don't give a #@$!" and well - that's why you take a break in between jobs.

Live and learn.

And, sorry Flybox, but the only working bike I have right now is the BMW, so I won't be able to make it.
Aight...no worries.  We might be in for a stormy weekend anyway....
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline eigenvector

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Re: fork seal leaking
« Reply #8 on: July 24, 2015, 07:10:07 PM »
Those can make for the best rides sometimes.  Bummer I'll miss it.

On a positive note, I finally got the 750 running, be getting some seat time on that rickety beast this weekend.  Trying to get the front wheel bead to seat symmetrically.
Rob
--------------------------------
2018 HD Softail Heritage
1979 CB750K Limited Edition
1977 CB550K
1984 CB700SC Nighthawk
1983 VF750S Sabre

Offline flybox1

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Re: fork seal leaking
« Reply #9 on: July 24, 2015, 07:21:20 PM »
Those can make for the best rides sometimes.  Bummer I'll miss it.

On a positive note, I finally got the 750 running, be getting some seat time on that rickety beast this weekend.  Trying to get the front wheel bead to seat symmetrically.
Get it sorted by sunday....weather is looking good.  Duanob, me, and 3 guys from work are going. 
Itd be nice to meet another from the forum.
Details are in the pnw thread, or you can PM me.
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"