Author Topic: 1975 cb550k1 shifter shaft seal replacement help (Read 1727 times)

JDrider · « **on:** October 21, 2022, 02:59:32 PM »

I was under the impression that I just had to remove the shifter and behind it I’d be able to remove the seal and press in a new one. Do I have to remove the side cover and can I remove it without losing lots of oil? Need some help thanks. the oil seal I purchased is Honda oem 91202-k.
Is this the correct seal?

dave500 · « **Reply #1 on:** October 21, 2022, 03:38:03 PM »

the actual seal is in the main case,that cover has to come off,no oil behind it,itll be good to clean it out behind any way.
Remove the chain and sprocket,clean all the gunk away,screw a self tap screw into the old seal and pull it out.

dave500 · « **Reply #2 on:** October 21, 2022, 03:55:28 PM »

while its off check if the bike has ever had an o ring chain,they are too wide and can dig much worse than this into the case causing a leak.

JDrider · « **Reply #3 on:** October 21, 2022, 04:00:41 PM »

Quote from: dave500 on October 21, 2022, 03:38:03 PM

the actual seal is in the main case,that cover has to come off,no oil behind it,itll be good to clean it out behind any way.
Remove the chain and sprocket,clean all the gunk away,screw a self tap screw into the old seal and pull it out.

How far back is the seal on the shifter shaft? I don’t see it in that photo

grcamna2 · « **Reply #4 on:** October 21, 2022, 04:21:03 PM »

Quote from: JDrider on October 21, 2022, 04:00:41 PM

Quote from: dave500 on October 21, 2022, 03:38:03 PM
the actual seal is in the main case,that cover has to come off,no oil behind it,itll be good to clean it out behind any way.
Remove the chain and sprocket,clean all the gunk away,screw a self tap screw into the old seal and pull it out.

How far back is the seal on the shifter shaft? I don’t see it in that photo

The shifter shaft seal is at the bottom of the shaft pressed into the crankcase;clean all the old chain grease off of it to see it better.

JDrider · « **Reply #5 on:** October 21, 2022, 05:03:30 PM »

What is the best way to clean off old chain grease an oil inside there?

grcamna2 · « **Reply #6 on:** October 21, 2022, 05:05:55 PM »

Quote from: JDrider on October 21, 2022, 05:03:30 PM

What is the best way to clean off old chain grease an oil inside there?

A way I do it is to use Kerosene on a cotton rag.

JDrider · « **Reply #7 on:** October 21, 2022, 05:09:08 PM »

I don’t have kerosene. I wonder if I can use a spray degreaser?

Scott S · « **Reply #8 on:** October 21, 2022, 05:15:09 PM »

Order two seals. They're not expensive and there's a chance you might mess up one.
Remove the old seal and make sure there aren't any burrs around the case.
Tape up the splines on the end of the shift shaft. One thin wrap with painters or masking tape.
Cut a piece of PVC pipe just a little longer than the shift shaft.
Smear a TINY amount of Yamabond, Hondabond, etc., on the outside of the new seal. Do NOT use that orange RTV crap.
Slide new seal on, push it in by hand the best you can, then gently and evenly tap it seated with the PVC pipe.

grcamna2 · « **Reply #9 on:** October 21, 2022, 07:29:09 PM »

Quote from: JDrider on October 21, 2022, 05:09:08 PM

I don’t have kerosene. I wonder if I can use a spray degreaser?

Put gasoline on a rag to wash that stuff off.

dave500 · « **Reply #10 on:** October 21, 2022, 07:52:47 PM »

spray parts cleaner will be fine,dig all the lumpiest blobs out first.

JDrider · « **Reply #11 on:** October 22, 2022, 09:11:23 AM »

So, I started this this morning, was able to remove old seal.
What I didn’t realize was that oil would start pouring out.
So in a panic I went inside to get new seal and instal the best I could by hand.
It was still dripping oil. I searched and finally found a pipe I could use to evenly press the seal in.
And then it stopped leaking.
Cleaned up and kept checking for leaks.
Nothing so far.
Fingers crossed.
Cleaned and install covers and shifter.
I attached a before and after cleaning and seal installed picture.
Thanks for everyone’s help.

bryanj · « **Reply #12 on:** October 22, 2022, 09:39:14 AM »

I take it you were working with it on side stand, on centre stand shouldnt leak

JDrider · « **Reply #13 on:** October 22, 2022, 09:40:38 AM »

Don’t have a center stand, but one is ordered and arriving later today

JDrider · « **Reply #14 on:** October 22, 2022, 01:41:14 PM »

So …
I took it for a 20 minute ride to get it warmed up.
It’s leaking.
Ugh …

bryanj · « **Reply #15 on:** October 22, 2022, 01:47:32 PM »

Are you sure its the seal? Other leak points are
1 the blank plug in front of sprocket if an O ring chain has ever been fitted
2 Oil pressure switch
3 oil pump to casing O rings
4 oil pump cover O ring

JDrider · « **Reply #16 on:** October 22, 2022, 01:49:40 PM »

I will open it up again and see if it’s leaking anywhere else.
Right now it’s whiskey time.
Thanks for the help!

bryanj · « **Reply #17 on:** October 22, 2022, 04:31:22 PM »

If you need the oil pump O rings look up Nurse Julie, sells viton kits, may be a bit extra postage from UK but still good, also does carb kit O rings as long as it hasnt got pd carbs

Scott S · « **Reply #18 on:** October 22, 2022, 06:34:38 PM »

Quote from: JDrider on October 22, 2022, 01:41:14 PM

So …
I took it for a 20 minute ride to get it warmed up.
It’s leaking.
Ugh …

Is the sump leaking? Are you sure it's coming from under the sprocket cover?

JDrider · « **Reply #19 on:** October 22, 2022, 06:54:29 PM »

I will check this out tomorrow and see. Thanks!

dave500 · « **Reply #20 on:** October 22, 2022, 08:31:35 PM »

not only can the oil pressure switch leak at the terminal end its also a tapered thread that might just need tightening or even use some teflon tape on it.

HondaMan · « **Reply #21 on:** October 22, 2022, 08:35:02 PM »

Look closely at the new seal: it should have the size on it. The first number should NOT be "14", if it is, then it is not a genuine Honda seal. The shaft hole must be 13.8mm, not 14mm, and the counterfeit versions are selling the 14mm hole size seals because they are less than $1 to buy. If it is the 14mm seal it will leak oil when hot, because the shifter shaft is slightly less than 14mm diameter and the oil rests against it when parked on the sidestand.

JDrider · « **Reply #22 on:** October 23, 2022, 03:50:06 AM »

It was a genuine Honda part.
13.8

Deltarider · « **Reply #23 on:** October 23, 2022, 04:07:16 AM »

My spare O-ring (PN: 91202-216-000), ordered at CMSNL has '13.7' on it. So far I didn't need it. The right engine oil can keep old rubber parts supple.

JDrider · « **Reply #24 on:** October 23, 2022, 04:17:45 AM »

The one I pulled out had a 13.7 on it.

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Author Topic: 1975 cb550k1 shifter shaft seal replacement help (Read 1727 times)