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Author Topic: C5 fork oil changes  (Read 50 times)

barenekd

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C5 fork oil changes
« on: October 17, 2014, 10:09:02 PM »
somewhere in the deep dark past, there appeared and Olde Wife that said all C5s had to have the fork removed as there was only one way to dump the odl oil out and that was through the top.
I always thought this sounded kind of ridiculous as I've never seen a bike yet that needed to pull the forks off to change oil. The idea seems to persist as a friend of mine mentioned he hadn't changes is C5 fork oil because of that.
Since I do have a shop manual for REs I figured maybe I should check this out.  I never really looked at the C5 before because I didn't have one. The first line in the book for C5s, after taking the wheel off, which isn't necessary on the leading axle forks, is to "Remove the allen screw from the bottom tube and drain the oil." Where these guys got the idea that you have to take the forks out is beyond me. It's pretty much the same way you drain all the old English bikes. Some of them had an extra plug to do it. I guess I'll have to post this and get another Olde Wive's Tale abolished.
So you can go out and do your oil change in short order. You'll sure like the ride better! Don't forget to pull the plug on top of the forks first. You might want to wrap a rag around the bottom of the forks when you unscrew the allen bolt. Mine sprayed oil all over the place  when I undid the first one, but I still had the top cap on.
Bare
2013 Moto Guzzi V7 Racer
2011 Black Classic G5 (RIP)
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JVS

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Re: C5 fork oil changes
« Reply #1 on: Today at 12:42:03 PM »
Hi Bare,

The C5 fork top has a 12mm hex cap as seen here:



Even if we remove the bottom allen screw, there is no way we can refill the oil from the top. Because this is how the 12mm cap is:



It is next to impossible to unscrew it. It is a reverse thread, but I have been unable to take that 12mm cap out. And you won't believe it, I have a B5. Same forks as the C5  :(

If one can't open the top cap, the only way is to remove the fork leg, remove bottom allen screw with an impact wrench, drain oil, and refill from the bottom again. Either way we do it, we need to remove the fork leg. Or a more radical way is to drill a hole in the top 12mm cap.

You can see more pics taken by Ducati Scotty at the following link.
https://picasaweb.google.com/117537683488075584374/EnfieldFork?authkey=Gv1sRgCIuiwMCp4ZfToAE
Sons continuing wars, our fathers were enemies


barenekd

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Re: C5 fork oil changes
« Reply #2 on: Today at 08:51:43 PM »
Yup, looks like the refill could be an issue. I'd figure out something if it were mine though. Maybe just get a bunch of moving blankets and lay it on its side and fill them from the bottom. Or drill out the 10mm hole if leaking wouldn't be a problem. Have to see how the top is sealed.
Bare
2013 Moto Guzzi V7 Racer
2011 Black Classic G5 (RIP)
I refuse to tiptoe through life only to arrive safely at death
http://www.controllineplans.com

mattsz

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Re: C5 fork oil changes
« Reply #3 on: Today at 09:08:24 PM »
What would happen if we drilled a small hole in the center of that 12mm hex cap?  Is an "airtight" seal needed there?  Maybe we could then drain the oil from the bottom, and refill from the top just by removing the cap screws...