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Thread: ohlins forks

  1. #1
    Superbike Twin
    Join Date
    Mar 2011
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    184

    ohlins forks

    Hi guys wonder if you can help stripped my Ohlins forks down to change the oil , just wondered is there a critical setting for the fork caps to screw on too the internal rod which has the 17 mm nut on to lock the cap into place , mine are currently at the bottom of the thread of the rod ( cant remember where they were when i stripped them down )

    Thanks eddie

  2. #2
    Baby Twin bollockchops's Avatar
    Join Date
    Feb 2011
    Posts
    82
    here you go mate this will help ya

    Below is a basic "how to" on the Ohlins R&T forks
    Get front up in the air and remove tire and brake calibers. Note were your preload is set (turns out from fully clockwise) so you can return them to the same position during assembly. Remove all preload. Loosen completely the top triple clamp pinch bolts, use fork cap tool to loosen cap. Three general methods; Ohlins specific tool - pricey, Dan Kyle's tool sold here on AF1 or use the preload nut to loosen cap (the backyard mechanic I don't care method). Id recommend you use masking tape on the blue preload nut regardless as its easily marred. Adjust both rebound and compression damping fully counter clockwise. Remember to count if you don't already know your settings from fully clockwise. Remove forks from bike.

    Completely clean fork(s) paying particular attention to the lower slider. Make sure no nicks, dirt or debris that may cut your fork seal. If you have a nick I use 800 grit or finer wet/dry sandpaper wrapped on a small square block of wood. Add a little oil to the sandpaper and carefully sand just the nub/nick/rough edge till its smooth.

    Continuing....Loosen completely the fork cap. Let top slider fall and rest on lower stanchant. The fork cap is held on by the 17mm nut underneath it. Push the sleeve below it down to get your 17mm wrench on the nut. This is under tension from the spring. Use wrench on cap and loosen. Turn compression damping fully clockwise. Remember to be gentle when the adjuster bottoms. You do this to keep the damping rod up while your disassembling. Otherwise once you remove the cap it slooowly falls into the fork tube. No big deal just a pain to get it back up. Remove fork cap. Remove preload tube, spring and aluminum rebound damping rod. This rod is in the middle of the tube that the 17mm is screwed on. Its long isn't it? This is what adjusts rebound damping by pressing down into the rebound cartridge and closing off the orifice. Turn 17mm counter clockwise till last couple thread hold it on and leave it there.

    At this point I'd measure the oil height. Should be any where from 105mm to 115mm in my experience with factory levels. Motionpro.com makes a couple tools for this. One is a cheap turkey baster and the other a cool rod and holder. Both have measured marked increments or you can make your own.

    Obviously you'd be changing the oil so go ahead and pour it out. Always keep control of both fork pieces. Now you must remove all the oil thats in the cartridge. Turn compression damping all the way counter clockwise. Fingers on 17mm nut move the damping rod up and down. Both with the fork right side up and up side down. You'll know when all the oil is discharged when it moves freely. Lots of sucking noise doing this. Continue to let the forks drain. Many use brake clean or carb cleaner to help flush out the remaining oil. My personal opinion is its a bit too harsh on the aluminum and bushings. I use kerosene or new fork oil (cheaper brand) myself. You'll put some cleaner in the fork then move the damping rod up and down to fill it then go through the whole remove procedure again. I do this several times. Remember, you can't get or keep your forks too clean. Did I mention keep/get everything clean?

    Ok, time to assemble. Damping rod up, fill with some oil. Move damping rod up and down till all air is out of cartridge then continue to fill with oil to proper height. Fork should be fully compressed for measurement. Add spring and rebound rod . Once filled to correct height turn compression damping fully clockwise with damping rod up fully. Now, turn the 17mm nut down to nearly at the bottom of the threads.

    Ok, here is the part you MUST pay attention. Turn the rebound damping in the fork cap to fully clock wise. Screw the cap on and gently turn till it bottoms. Why it bottomed is the rebound rod is fully pressed into the rebound cartridge. Bring the 17mm up to bottom of cap but leave a thread exposed. Try not to turn the 17mm during this portion of assembly. Remove cap. Adjust rebound to fully counter clockwise.

    Next, I tie a small lead of solid wire 6-8" around the 17mm as its almost impossible to hold the damping rod up later once you insert the spring and preload tube. Install spring and preload tube. Wire should be sticking out from top. Holding wire install cap turning it within a thread of 17mm. Carefully turn 17mm to meet cap bottom. You'll want another set of hands at this point if you haven't figured it out as the preload tube has to be compressed while your doing all of this.

    On a side note, I mount my forks in my vise using soft jaws and holding by the brake caliper mounting points. Forks stay at an angle so oil doesn't come out but I can pull on the preload tube thus saving me having my wife help me with this....not something she thrilled about doing! A couple aftermarket company's sell tools to do this RaceTech being one of them. Anyways, tighten nut to fork cap and finish reassembly. Be sure to oil the o-ring on the cap before screwing it down. Torque it back on the bike as when you initially loosened it.

    Finally, reset preload, compression and rebound settings. Understand that your rebound may NOT be the same amount of damping with the same setting you were running prior to disassembly. Its nearly impossible to get the fork cap and 17mm nut to be in the exact location to each other before disassembly. If you did as I described your probably no more than a click + or - away on the rebound.

  3. #3
    Superbike Twin
    Join Date
    Mar 2011
    Posts
    184
    cheers for that , spot on

    Thanks eddie

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