Author Topic: CB550K1 dripping oil?  (Read 153 times)

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Offline Erny

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CB550K1 dripping oil?
« on: February 11, 2019, 11:22:47 am »
Yesterday I removed left cover in order to replace sprocket and clean that area. I did nost finish job and came back today. I found out that there is oil slowly dripping from hole right to shifter shaft... Is that normal?? Intensity is low but still...


CB750K K7 USA model (1977)
CB550K1 USA model (1975)

Offline CarbonK

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Re: CB550K1 dripping oil?
« Reply #1 on: February 11, 2019, 11:47:39 am »
Source may be coming from the shifter shaft oil seal. Won’t be able to tell until you get the sludge off.

Offline bryanj

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Re: CB550K1 dripping oil?
« Reply #2 on: February 11, 2019, 12:07:24 pm »
That looks like a welded up break under all the crap, if so new(to you) cases would be the best fix
Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

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Offline DaveBarbier

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Re: CB550K1 dripping oil?
« Reply #3 on: February 11, 2019, 12:55:35 pm »
Possible a PO put a longer screw in that hole and broke through the case while tightening it down. Definitely clean the area and find the source.

If it is what I said above you can put in an M6 1.0 set screw with some sealant on it deep in the hole and just use a slightly shorter screw to hold on the sprocket cover.

Offline Erny

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Re: CB550K1 dripping oil?
« Reply #4 on: February 11, 2019, 01:08:13 pm »
Source may be coming from the shifter shaft oil seal. Won’t be able to tell until you get the sludge off.

Just came from garage,  I cleaned area, looks it is shifter shaft seal, will check again tomorrow when I'll see oil path.

In case it will be confirmed - to change that seal what need to be removed to replace it?
CB750K K7 USA model (1977)
CB550K1 USA model (1975)

Offline CarbonK

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Re: CB550K1 dripping oil?
« Reply #5 on: February 11, 2019, 02:17:01 pm »
Source may be coming from the shifter shaft oil seal. Won’t be able to tell until you get the sludge off.

In case it will be confirmed - to change that seal what need to be removed to replace it?

Just the seal at that point since you already got the shift lever and sprocket cover off. Refer to this thread for some info on seal replacement. http://forums.sohc4.net/index.php/topic,176081.0.html

Offline BomberMann650

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Re: CB550K1 dripping oil?
« Reply #6 on: February 11, 2019, 07:33:04 pm »
Stick a mechanics hook in that seal and pry it out

Lube up a new one, tape over shifter splines and slide the new one into place.  A well fitted pvc pipe (sanded smooth of course) will help with the final press.
可燃自転車 Kanen Jitensha Combustible Bicycle
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Offline Erny

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Re: CB550K1 dripping oil?
« Reply #7 on: February 12, 2019, 11:11:23 am »
Checked today again, definitely leak comes from the seal.
I'll order new one, thanks for advices!
CB750K K7 USA model (1977)
CB550K1 USA model (1975)

 

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