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Author Topic: CB750K1 Oil Lines  (Read 626 times)

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Offline 34barab

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CB750K1 Oil Lines
« on: December 31, 2019, 08:56:14 PM »
Got the bike in October and still going over and cleaning everything.  Discovered that the mesh covering of the outer oil line, the visible one, is a bit frayed where it curves under the clutch cover.  In an effort to remove it to see if the inner rubber is damaged, I found the female fitting very difficult to loosen.  WD40 doesn't help.  How do you loosen the fitting without deforming or breaking the neck of the tank.
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Current Projects: 1973 CB750K3; 1972 CB350K4; 1980 CX500D;1969 CB750.  Roadworthy: 1971 CB750K1

Offline 34barab

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Re: CB750K1 Oil Lines
« Reply #1 on: December 31, 2019, 08:58:47 PM »
And a Happy New Year to all!!
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Current Projects: 1973 CB750K3; 1972 CB350K4; 1980 CX500D;1969 CB750.  Roadworthy: 1971 CB750K1

Offline scottly

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Re: CB750K1 Oil Lines
« Reply #2 on: December 31, 2019, 09:01:26 PM »
If it's not leaking, leave it alone. ;)
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Offline 754

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Re: CB750K1 Oil Lines
« Reply #3 on: December 31, 2019, 10:57:15 PM »
Heat it up , I had one where the paint started cracking on tank from being stuck and trying to break it loose.  I think I ended up just hanging it on the wall .
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Offline 34barab

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Re: CB750K1 Oil Lines
« Reply #4 on: January 01, 2020, 05:08:14 AM »
Quote from: scottly on December 31, 2019, 09:01:26 PM
If it's not leaking, leave it alone. ;)

Is it a common problem that the oil hose rubs against the bottom of the clutch cover.  Not leaking yet, but I assume it will eventually?  I don't know how many layers the hose has.  What was the purpose of the outer mesh fabric?
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Current Projects: 1973 CB750K3; 1972 CB350K4; 1980 CX500D;1969 CB750.  Roadworthy: 1971 CB750K1

Offline 69cb750

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Re: CB750K1 Oil Lines
« Reply #5 on: January 01, 2020, 05:14:21 AM »
The mesh protects the rubber.
Drain tank, unbolt hose from engine, heat fitting if needed
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Online MauiK3

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Re: CB750K1 Oil Lines
« Reply #6 on: January 01, 2020, 08:57:39 AM »
soak it in ATF for a bit, might help
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Offline CaptFatCat

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Re: CB750K1 Oil Lines
« Reply #7 on: January 01, 2020, 12:22:38 PM »
Heat it first then apply WD40, never use a steady pull of a wrench, always use a bump bump bump pull on a wrench.
You can go by your electrical supply store and get a large piece of heat shrink tubing to dress it up again and prevent the rub from happening.
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Resurrecting a Herman Munster CB750 from a few old baskets of K2 and K7 parts.

Offline BenelliSEI

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Re: CB750K1 Oil Lines
« Reply #8 on: January 02, 2020, 11:11:47 AM »
Heat from a small propane torch (be careful, move it around the faces of the fitting) will expand it and make it easier. Do it a few times, letting it cool right down. The expanding and contracting usually breaks it free.

That rubber hose is surprisingly thick wall. If there is only a small wear spot, leave it alone. Cut a small chunk of old rad hose and glue it over the wear spot, for 100% protection......
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