Anti-Dive Fork Explosion

Hey all!

I have been in the process of rebuilding my '82 Seca 750's forks and noticed there wasnt a whole bunch of information online. Here is what the anti-dive forks look like exploded on a 1982 XJ750RJ

I thought I'd upload these photos and share them-


Every piece of a single fork laid out




This is a view of the Antidive valve minus the nylon bushing(goes between the bolt and piston). Notice that on this particular model you would NOT damage anything by overturning the adjustment screw at the bottom(its inside the castlenut looking thing)


Another view of the Anti-dive valve



The anti-dive actuator plus the brake hose. The brake hose attaches to the brake caliper banjo-bolt and when you hit the brakes the piston is pushed out.


Another view of the Anti-dive actuator




The air valve(for changing the air pressure in the fork) is on the left, it simply slides onto the outside of the chrome inner.


Same thing, another view




Dust Seal, circlip, washer, oil seal, cupped washer, lower bushing and oil lock. The oil-lock is the piece right in front of the fork lower and it gets sandwiched between the bottom of the lower fork and the damper rod.

 

Great pictorial layout of the anti-dive and forks Special-edy , thanks. And for variety my '81 and the '82 have threaded fork caps

 

WOW very well done special ed !! this will be of great help to me in the future !

 

Great job...........but not shown is the two special paper-thin washers that fit INSIDE the oil-lock valve unit........one is a flat washer and the other is a bent (wave) washer, perhaps they were missing from these forks OR they are "stuck" down inside he oil lock valve?

This thread:

http://xjbikes.com/Forums/viewtopic/p=159288.html

has a decent view of those two wahers in the photos just before the "re-assembly" section.

 

The washers are there; first pic, just above the lower end of the damper rod.

 

You are right, my bad!! My bad eyes, that is.........

 

What is missing from the picture though is the taper spindle. It should go onto the damper rod between the spring washer and the oil lock.

 

Here are some pictures of the damper assembly


The damper rod assembled, the lower fork tube and chrome upper are laid approximately where they would sit on the damper rod. The allen head bolt goes through the bottom of the fork tube, through the oil lock and into the damper rod. The damper rod is thus bolted to the bottom of the fork.


An assembled fork, you can see the oil-lock in the bottom hole and the damper rod in the upper hole.



The spring washer holding the taper spindle against the oil lock. This is how it normally sits against the bottom of the fork tube.



This is how the blow off valve operates.



The damper rod installed in the upper chrome stanchion. The nylon ring on the damper rod makes a almost airtight seal. This is how it sits with the fork unloaded/uncompressed. The bolt on the far left(bottom of the oil lock) would be bolted through the very bottom of the lower fork tube.



This is how the damper rod sits in the upper when the fork is bottomed out or fully compressed. Notice that the upper tube and the damper rod basically form a syringe.

 

THANK YOU so much for this, it will definitely come in handy when I tear my forks apart this weekend!

 

Yes it feels great to know that so many people found it helpful.
I've also got some pictures of the reassembly that I need to upload.

 

Right, I've been trying to wrap my head around this.
Thanks

 

Thanks for a detailed pictorial! While my Seca 550 doesn't have anti-dive, I can see how this would be a real mother for anyone trying to look at a crappy drawing in a Clymer's (ask me how I know this...)
Kudos to you for your efforts and excellent photography!

 

Awesome job. Will definitely help when doing mine. Thanks.

 

Fantastic job! Send this to clymer + show them how it's done!

 

Superb! Pls do the rest of the bike :lol:

More anti dive here:

http://www.xjbikes.com/Forums/viewtopic ... rt=15.html