SOHC.co.uk Forums > CB350/400
CB400/4 FRONT FORK REFURB BY JULIE
Nurse Julie:
A slight diversion from the engine building today. On a couple of occasions the front forks have bottomed out and stayed stuck down momentarily. Also the forks seemed to be very hard to me on normal riding. Therefore decided to take them apart and refurb. I know many of you are expert with front forks but this is the first time for me doing this on an old Honda, so I thought I would share.
Here they are out of the bike.
[ Guests cannot view attachments ]
I took the top nut off with the air wrench.
[ Guests cannot view attachments ]
I also used the air wrench to remove the bottom bolt. This is an Allen head bolt, so needed an Allen bit, plus a little extension bar to get in between the studs. Before using the wrench I gave the Allen bit / extension bar a couple of good whacks with the big persuader.
Trig said it is always best to use the air wrench as this can prevent the part that the bolt is attached to inside, the bottom of the under seat pipe, turning with the nut.
[ Guests cannot view attachments ]
The old oil seal stop was then removed
[ Guests cannot view attachments ]
and then the old oil seal.
[ Guests cannot view attachments ]
The fork pipe was pulled out from the bottom case. The fork was then turned upside down to drain all the fork oil. All the internals were then taken out. The spring, the under seat pipe, the oil lock piece and the external drain bolt.
Every part was then cleaned thoroughly in solvent and dried. Including getting a long piece of stiff wire with a rag attached right down to the bottom to make sure all the old crud had been removed. As Trig was doing some polishing at the time, he polished the bottom cases for me.
Nurse Julie:
All parts cleaned and ready for reassembly.
[ Guests cannot view attachments ]
The oil lock piece was dropped down inside the fork pipe, then the new seal was inserted. A little red rubber grease helped this go in but even then it was still a very tight fit.
[ Guests cannot view attachments ]
The under seat pipe and the spring were inserted and the socket bolt re inserted and done up with the air wrench.
The under seat pipe
[ Guests cannot view attachments ]
All internals back in and showing the top of the spring.
[ Guests cannot view attachments ]
As this was a total strip down the amount of fluid to be put in is 160 to 165 mls. I wanted them on the softer side so went for the 160 mls.
The new seal in place in the bottom case with the oil seal stop in place and the fork pipe in situ.
[ Guests cannot view attachments ]
Nurse Julie:
New O ring applied to the top nut and done up using a normal spanner.
All back together and standing upright for 24 hours to make sure there are no leaks. All copper washers were changed where necessary.
[ Guests cannot view attachments ]
A nice little job to do. I did find that I needed more than one pair of hands at times, so I got Trig to help.
PatM:
Excellent photos- no reason to understand why the forks jammed down though.
the 2nd to last looks like the spring ring is displaced?
Nurse Julie:
--- Quote from: PatM on December 15, 2017, 05:08:24 PM ---Excellent photos- no reason to understand why the forks jammed down though.
the 2nd to last looks like the spring ring is displaced?
--- End quote ---
I will check the spring ring Pat.
Navigation
[0] Message Index
[#] Next page
Go to full version