Author Topic: Leaking rear shock  (Read 2740 times)

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Offline bajakirch

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Leaking rear shock
« on: July 06, 2012, 01:56:50 am »
Tonight I noticed a small spot of what appeared to be grease underneath my C10. I touched it and it was thicker than oil but not as thick as grease.

Later, I grabbed a flashlight and took a closer look under the bike. This is what I discovered at the base of my rear shock:





The bike is new to me; I just picked it up 2 weeks ago. And I've never owned a bike with this kind of adjustable monoshock before.

So what am I looking at?
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Offline bajakirch

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Re: Leaking rear shock
« Reply #1 on: July 06, 2012, 12:28:06 pm »
I used the search function a bit. Am I maybe seeing evidence of a blown seal on the rear shock?

If so, is that repairable, or am I going to be looking for a new rear shock?
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Offline RWulf

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Re: Leaking rear shock
« Reply #2 on: July 06, 2012, 12:57:00 pm »
Just wipe it off and see if it comes back. To me it looks like grease most likely from when the suspension was last lubed.
Shock oil is much thinner and will drip onto your floor.
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Offline WillyP

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Re: Leaking rear shock
« Reply #3 on: July 06, 2012, 01:20:15 pm »
Agreed, it's not likely to be shock oil, from your description. However there is only one way to know for sure, wipe everything down really well and see where the oil is coming from.

The stock rear shock is not rebuild-able. You can, (and should,) replace the shock fluid periodically, you can get a kit to do so from Murph.
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Offline oldsawfiler

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Re: Leaking rear shock
« Reply #4 on: July 06, 2012, 02:47:01 pm »
Never adjust the air pressure in the shock with a compressor.
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Offline C. Moore

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Re: Leaking rear shock
« Reply #5 on: July 07, 2012, 10:16:56 pm »
It's my understanding that the rear shock is not repairable. If you have to replace it I would check Ebay. There always seems to be one and you can usually pick them up a lot cheaper than going new in the aftermarket. I would keep an eye on it as the others have said and see if it really is leaking.
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Offline cra-z1000

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Re: Leaking rear shock
« Reply #6 on: July 07, 2012, 10:37:55 pm »
Any engine leaks you may have also are blown back and tend to collect there .
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Offline bajakirch

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Re: Leaking rear shock
« Reply #7 on: July 08, 2012, 08:30:37 pm »
Today I finally had some time to investigate this a little further. Plus, the temperature outside was back down to a comfortable 90 degrees. So I started poking around a little more.

I wiped down the bottom of the rear shock to get rid of the residue I saw there. I noticed that the accumulation was only on the lower 1/3 of the shock and lower attachment point. As I was wiping things down, I noticed that there seemed to be some similar material accumulated on one of the hoses sticking out of the bottom of the bike. This was in front of the shock, so it's not likely that fluid from a leaking shock would be blown that direction.

I followed that tube up and almost the full length of it was coated in the residue. Oddly, nothing around it was, as I would expect to see if something like engine oil was being blown back.

I traced the tube to the bottom of the airbox (or, at least, the air filter housing. Looking underneath the housing I saw the original tube I was following, which I assume is a sump for accumulated engine oil and fuel that makes it into the filter area. Or, that's what I have on my Nighthawk, though the Honda has a cap on the tube so you can empty it when you choose. But I don't know what the other tube is for, and that seems to have more of this greasy residue on it.  I can't see anything forward of these 2 hoses that appears to be leaking, so I suspect they might be the cause.

Can anyone identify these tubes, and what might be the cause of the leak?

Pic of the underside of the air filter housing, where the 2 tubes originate:

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Offline danodemotoman

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Re: Leaking rear shock
« Reply #8 on: July 08, 2012, 10:59:24 pm »
 The tube at bottom of airbox is a drain, oil collects in box due to over oiling of filter and blowby.
 My experience with a leaking stock shock had a small, small drip that was barely noticeable on the garage floor. Possible the 115 mph ride over the CA 120 rollercoaster road and getting air had something to do with shock leakage?
 Still crazy after all these years.

Offline bajakirch

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Re: Leaking rear shock
« Reply #9 on: July 09, 2012, 12:07:02 am »
Quote
The tube at bottom of airbox is a drain, oil collects in box due to over oiling of filter and blowby.

So I was right about that one. What about the other one, that looks sort of L-shaped?
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Offline bajakirch

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Re: Leaking rear shock
« Reply #10 on: July 10, 2012, 08:36:04 pm »
bump?
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Offline Wess

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Re: Leaking rear shock
« Reply #11 on: July 10, 2012, 09:14:11 pm »
I may be wrong and usually am but I think it is part of the pollution control system.   All I remember for reading was that you need to plug it back in when you reinstall the airbox.
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Offline goatmar

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Re: Leaking rear shock
« Reply #12 on: July 10, 2012, 10:40:40 pm »
Hey Wess aren't you replacing that shock anyways ???  I thought you were putting on a C-14 shock?  :o
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Offline bajakirch

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Re: Leaking rear shock
« Reply #13 on: July 15, 2012, 09:12:49 pm »
I saw on another discussion that someone mentioned the crankcase breather connects to the airbox through a 90-degree bend on the bottom of the airbox. Is it possible that this is what I'm looking at?
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Offline Mcfly

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Re: Leaking rear shock
« Reply #14 on: July 15, 2012, 10:17:21 pm »
I saw on another discussion that someone mentioned the crankcase breather connects to the airbox through a 90-degree bend on the bottom of the airbox. Is it possible that this is what I'm looking at?

Yep, it is the crankcase breather.  Just had the air box out, that goes to the breather cover.
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Offline mdr

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Re: Leaking rear shock
« Reply #15 on: July 19, 2012, 03:07:40 pm »
Yep.  The 90 degree thing is the crankcase breather.  Is it not on the nipples properly?  I'm surprised to see it 'weeping'. 

Oil level ok?  How long since the air filter was oiled?  Lots of oil in the air box?
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Offline bajakirch

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Re: Leaking rear shock
« Reply #16 on: July 19, 2012, 05:17:27 pm »
Yep.  The 90 degree thing is the crankcase breather.  Is it not on the nipples properly?  I'm surprised to see it 'weeping'. 

Oil level ok?  How long since the air filter was oiled?  Lots of oil in the air box?

Oil level's OK. Don't know about the last oiling of the filter; I picked up the bike about 3 weeks ago and the PO didn't have that on his maintenance list. Not much oil in the box, just sort of coating about half the bottom. Certainly much less than when I finally pulled the air filter on my Honda...after over 2 years of riding. I finally figured what that plug on the bottom of the tube was for, and why they call it 'the puke tube'. Blech!
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