700scChop 
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Bike: 1986 cb700sc
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« on: June 07, 2010, 08:14:10 PM » |
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i have a 1986 700sc. its leaking oil from one of the rear frame tubes. i was wondering if anyone has ever connected the two lines together so the oil would just stay in the motor. or has anyone tryed using a tank instead of the cooler. the bike has a homemade hard tail. the place its leaking is hard to get to so i cant just weld it and clamp it.
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gammer
Crazy Canuck
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« Reply #1 on: June 07, 2010, 09:22:59 PM » |
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Heh...on one of my Nighhawk S's I was putting the frame mounting bolt on the right side on...except I had the wrong bolt, it was too long and I punctured that inner oil line that runs through the frame.
Solution - took that frame in for scrap metal and mounted all my parts onto a spare parts frame.
My point...if its leaking oil from the frame, there isn't much you can do. You could see about rigging up an aftermarket oil cooler with external lines. That would be about the easiest thing.
I really don't think you want to disable it.
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ariwhiteboy
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« Reply #2 on: June 07, 2010, 09:41:28 PM » |
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the place its leaking is hard to get to so i cant just weld it and clamp it.
This is no bueno...Sounds like a ruptured line, happens on 25 year old bikes though. Since you seem to have some fab experience and are doing the hard tail thing, I would suggest going all the way and building a custom frame. You could probably do that much easier than finding a spare 700s frame laying around. |
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What is good Phaedrus, what is not good? Need we ask anyone this?
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700scChop
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« Reply #3 on: June 08, 2010, 08:36:57 PM » |
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can you explain to me how the oil flows through the frame? is there lines that come from each side of the motor up through the frame and to the oil cooler doing a constant loop?
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gammer
Crazy Canuck
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« Reply #4 on: June 08, 2010, 09:34:12 PM » |
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There is an inner line inside the frame tube that does run up to the oil cooler and back down to the engine. There is a line on both the left and right side of the bottom part of the engine that connect into that inner tube on the frame.
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Munkey
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« Reply #5 on: June 09, 2010, 06:44:43 AM » |
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When I purchased my bike, it came with a parts bike that someone had bypassed the right side frame downtube with a line by putting a fitting at the top where the oil exits the cooler. The line then ran down beside the downtube to another fitting where the oil re-enters the oil pan. Since the bike did not run and I got no past history on the bike, I have no idea whether this plan had worked or was the cause of the downfall of the bike.
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1985 CB700SC Nighthawk
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700scChop
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« Reply #6 on: June 09, 2010, 12:22:43 PM » |
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So is there a way to replace the line inside the frame? Will it pull out?
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OhCrap
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« Reply #7 on: June 09, 2010, 01:28:16 PM » |
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I don't have anything helpful to say except perhaps there's always a way, but I'd like to see some pictures of that hardtail please.
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gammer
Crazy Canuck
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« Reply #8 on: June 09, 2010, 01:30:11 PM » |
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So is there a way to replace the line inside the frame? Will it pull out?
No the lines are permanent in the frame. If you have a damaged line, you will have to go with an external line. I believe the 91-02 Nighthawk 750 uses an external line. You might want to look at the micro fiche for it say on www.powersedge.com |
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700scChop
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« Reply #9 on: June 10, 2010, 07:30:37 AM » |
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Ok so I bought a used cooler on ebay for a 93 nighthawk 750. It looks like the lines just bolt to the side of the motor. Does this sound right?
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82CB750SC
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Now...what does this thing on the bike do?
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« Reply #10 on: June 10, 2010, 07:51:10 AM » |
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Joe
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gammer
Crazy Canuck
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« Reply #11 on: June 10, 2010, 11:04:33 AM » |
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Ok so I bought a used cooler on ebay for a 93 nighthawk 750. It looks like the lines just bolt to the side of the motor. Does this sound right?
It sounds right, but check the micro-fiche on powersedge.com...  |
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700scChop
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« Reply #12 on: June 10, 2010, 07:52:07 PM » |
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yea i checked that but its hard to tell where the lines go. the ends look the same as mine though.
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detdrbuzzard
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« Reply #13 on: June 11, 2010, 07:05:19 AM » |
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i've read this post a few times now and even if tou replace the oil cooler line with an external line it still leaves you with a cracked frame
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'75CB750k, '79CB750 super K,
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gammer
Crazy Canuck
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« Reply #14 on: June 11, 2010, 08:50:43 AM » |
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i've read this post a few times now and even if tou replace the oil cooler line with an external line it still leaves you with a cracked frame
I don't know the frame itself is cracked, or just the internal oil line that runs inside the frame... |
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700scChop
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« Reply #15 on: June 11, 2010, 08:50:24 PM » |
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the frame is not cracked just has a small hole in a hard to get to place where one of the tubes welds to the rear fender strut.
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700scChop
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« Reply #16 on: June 15, 2010, 09:14:19 AM » |
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Ok so yesterday I received my used oil cooler from a 92 nighthawk 750. It was a direct bolt on. I have yet to test it because I need to get new oil but everything bolted to stock locations. Now I have external lines. So hopefully no leaks when I do run the bike.
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gammer
Crazy Canuck
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« Reply #17 on: June 15, 2010, 09:22:10 AM » |
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I would love to see pics of this please.
I've always been curious if and how the later model NH 750 external oil cooler system would work on the older NH S?
Thanks...
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Munkey
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« Reply #18 on: June 15, 2010, 10:23:13 AM » |
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I would love to see pics of this please.
I've always been curious if and how the later model NH 750 external oil cooler system would work on the older NH S?
Thanks...
I agree. This would make a great project log. There's a lot of us here that might need to do this in the future. |
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1985 CB700SC Nighthawk
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700scChop
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« Reply #19 on: June 15, 2010, 06:37:41 PM » |
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bike before i painted it all black and finished the exhaust. ill take some recent pics soon. been crazy busy lately. harely fenders front was chanelled a little so it wasnt to wide. solo seat.
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Brittles
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« Reply #20 on: June 15, 2010, 06:45:30 PM » |
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bike before i painted it all black and finished the exhaust. ill take some recent pics soon. been crazy busy lately. harely fenders front was chanelled a little so it wasnt to wide. solo seat.
Wow, I've never seen a 700 chopped like that. Different for sure. How does it handle? Looks like a lot of rake with that slammed rear. |
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John
'84 CB700SC
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