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#269781 - 08/11/09 11:32 pm Commando oil lines  
Joined: Sep 2006
Posts: 609
MexicoMike Offline
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MexicoMike  Offline
BritBike Forum member

Joined: Sep 2006
Posts: 609
Mexico City, Mexico
Earlier today I was doing some routine work and decided to remove the oil tank. I discovered that the SS feed/return lines (installed by the PO) were nearly cut through from vibration! Yep, the return line had all the braided SS completely separated and the rubber hose abraded over half way through. And I was planning to ride this bike up to San Miguel in Oct. Basically the lines were right on the verge of rupturing.

What I found interesting is that braided SS lines are always considered the "best" stuff to use. But they had been rubbing against the base that the oil tank bolts to. Looks like a really poor set up that wasn't examined carefully when originally done (Yet ANOTHER issue with the "prominent" britbike seller from whom I purchased the bike).

I added the oil lines to my extensive Old Britts order... wink

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#269783 - 08/11/09 11:41 pm Re: Commando oil lines [Re: MexicoMike]  
Joined: Apr 2006
Posts: 1,395
johnm Online content
BritBike Forum member
johnm  Online Content
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Joined: Apr 2006
Posts: 1,395
New Zealand
Im actually not a huge fan of SS lines on a bike.

They can act as a hacksaw and I have seen a stainless braided front brake line saw a big groove in the fork slider.

If I used them I would like to have a clear plastic sleeve over them and carefull attention paid to the line routing. They seem to be more difficult to get the bends and clearnces just right.

John

#269803 - 08/12/09 1:36 am Re: Commando oil lines [Re: johnm]  
Joined: Sep 2006
Posts: 609
MexicoMike Offline
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MexicoMike  Offline
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Joined: Sep 2006
Posts: 609
Mexico City, Mexico
Yeah, I'm dumping them in favor of "normal" cloth-braided lines.

#269815 - 08/12/09 2:58 am Re: Commando oil lines [Re: MexicoMike]  
Joined: Apr 2006
Posts: 1,395
johnm Online content
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johnm  Online Content
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Posts: 1,395
New Zealand
Yes, Im not saying they shouldnt be used or that I would never use them.

But I would only use them with a plastic shield and I would make sure they were the correct lenght and carefully located. None of the comercially available ones I have seen would meet these criteria and I think you would have to make your own.

I have seen a few photos of your bike on the forum and it is very smart. It looks like the sort of bike where if your going to do something you would do it right!

Cheers

John

#269857 - 08/12/09 11:24 am Re: Commando oil lines [Re: MexicoMike]  
Joined: Aug 2001
Posts: 1,253
Dave Comeau Offline
Crew Chief
Dave Comeau  Offline

Crew Chief

Joined: Aug 2001
Posts: 1,253
Hamilton, Mass. USA
Mike
not all of us like the SS lines.
I would NOT use tham on a street commando even if given for free. Additional verbage about dealers who sell them will be omitted.

http://www.britbike.com/forums/ubbthread...=true#Post67481

Last edited by Dave Comeau; 08/12/09 11:25 am.

dynodave
BSA 3 1961-1963
Ducati 3 1992-2002
Norton many 1951-1975
87 Serv-Equip 100HP MC brake dynamometer,
#269867 - 08/12/09 12:35 pm Re: Commando oil lines [Re: Dave Comeau]  
Joined: Sep 2006
Posts: 609
MexicoMike Offline
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MexicoMike  Offline
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Joined: Sep 2006
Posts: 609
Mexico City, Mexico
One thing that surprised me is that the bike parts ate up the wire braiding, not the other way around. Makes me wonder if the SS braiding on the particular hose used was actually SS - it feels/looks like it but that would mean the mild steel of the Commando oil tank base plate is harder... seems unlikely.

I ordered the Gates hose available from Old Britts to replace all the existing braided hose.

Last edited by MexicoMike; 08/12/09 12:42 pm.
#269869 - 08/12/09 12:45 pm Re: Commando oil lines [Re: MexicoMike]  
Joined: Aug 2007
Posts: 221
Jim Clausen Offline
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Jim Clausen  Offline
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Posts: 221
Port St. John, FL USA
I experienced the same thing. I just chalked it up to the fine wire diameter of the braid. I've since sleeved the lines with a spiral wrap in sensitive areas. The wrap comes in both a sacrificial plastic or a longer wearing steel wrap. I use the plastic where there is contact with aluminum. I really consider the stainless steel brake line and the ss rocker arm oil line a necessity. As for the feed and return oil lines, I guess I just like them.

Last edited by Jim Clausen; 08/12/09 12:55 pm.
#269890 - 08/12/09 3:29 pm Re: Commando oil lines [Re: Jim Clausen]  
Joined: Sep 2006
Posts: 609
MexicoMike Offline
BritBike Forum member
MexicoMike  Offline
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Joined: Sep 2006
Posts: 609
Mexico City, Mexico
Here's a pic of the return line to the tank and the feed line to the engine. The return is the really bad one. Again, seems odd that the wear is all on the line; there is no sign of wear on the oil tank mounting plate where it was rubbing except for rubbing off the paint. The feed line was abraided where it passes through a little locating ring. One of the things that contributes to this is that the return line tube in the tank is angled a bit too far forward so the hose almost has to hit the plate. I'm afraid to try bending the tube though...


Last edited by MexicoMike; 08/12/09 3:31 pm.
#270095 - 08/13/09 4:59 pm Re: Commando oil lines [Re: MexicoMike]  
Joined: Nov 2007
Posts: 11
JohnP Offline
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JohnP  Offline
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Joined: Nov 2007
Posts: 11
New Jersey, USA
The bike came from the factory with rubber oil lines with a wound steel sleeve around each.

#270103 - 08/13/09 5:17 pm Re: Commando oil lines [Re: JohnP]  
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MexicoMike Offline
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MexicoMike  Offline
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Joined: Sep 2006
Posts: 609
Mexico City, Mexico
A wound steel sleeve? Perhaps that's on a different year. My 1973 factory parts manual shows cloth-braided rubber hose with plastic spiral protectors over the hoses at the oil filter for about 6-8 inches. No other areas have any protective plastic.

#270136 - 08/13/09 9:27 pm Re: Commando oil lines [Re: MexicoMike]  
Joined: Nov 2007
Posts: 11
JohnP Offline
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JohnP  Offline
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Joined: Nov 2007
Posts: 11
New Jersey, USA
My 850 is SN#311xxx, a mark IIA, and while it is possible the steel protectors were later added by the owner it is unlikely. He didn't touch the bike enough. I'll try to shoot a pic and share. Oh, and I did replace both the rubber lines and sleeves with braided steel lines and inspect them periodically - no unusual wear so far.

#270137 - 08/13/09 9:37 pm Re: Commando oil lines [Re: JohnP]  
Joined: Sep 2006
Posts: 609
MexicoMike Offline
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MexicoMike  Offline
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Joined: Sep 2006
Posts: 609
Mexico City, Mexico
I have to say that in this application I would not use braided SS again. I had a 71 750 Commando that I sold in 78 (STUPID!!) and it still had it's factory original lines with no problems.

I also have to say that sometimes I think we "upgrade" things to a lower level that they were originally! wink

Last edited by MexicoMike; 08/13/09 9:38 pm.
#270141 - 08/13/09 9:43 pm Re: Commando oil lines [Re: MexicoMike]  
Joined: Apr 2006
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johnm Online content
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johnm  Online Content
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Posts: 1,395
New Zealand
My July 1974 build 850 Roadster Mk 11 (older style airbox not plastic) had the rubber lines with a steel spiral wound protector for about 3 inches each end. Seems similar to what JohnP is describing.

John

#270145 - 08/13/09 9:59 pm Re: Commando oil lines [Re: johnm]  
Joined: Sep 2006
Posts: 609
MexicoMike Offline
BritBike Forum member
MexicoMike  Offline
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Joined: Sep 2006
Posts: 609
Mexico City, Mexico
Well, I can't say what my bike might have had originally since it was all replaced with SS braid. Perhaps, regardless of the parts manual's depiction, they came with whatever the guys at Wolverhampton (or wherever they were assembled) had handy and they installed it in whatever fashion the particular assembly guy felt like at the moment! smile

Here's a pic of the shop manual excerpt

Last edited by MexicoMike; 08/13/09 10:30 pm.
#270154 - 08/13/09 11:58 pm Re: Commando oil lines [Re: MexicoMike]  
Joined: Feb 2008
Posts: 190
Fullauto Offline
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Fullauto  Offline
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Posts: 190
Perth Western Australia
They're not plastic, but steel. Just renewed mine a while ago. They are available.

#270177 - 08/14/09 2:53 am Re: Commando oil lines [Re: Fullauto]  
Joined: Sep 2006
Posts: 609
MexicoMike Offline
BritBike Forum member
MexicoMike  Offline
BritBike Forum member

Joined: Sep 2006
Posts: 609
Mexico City, Mexico
I stand corrected! You guys are absolutely right. I looked at the shop manual and the pic looks like spiral plastic so I made that assumption and we all know about ASSumptions. BUT in actually reading the manual description of part 37, it states that it is a "protection spring" which actually sounds like what was described by other folks. But the area around the filter is the only place it is shown which, on my bike, had no wear at all. wink The wear on my return hose was at the 90 degree bend just below the tank where the number "7" is shown on the diagram.


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