CB350 Points Cover Should it look like this?

bowenac

bowenac

New Member
EDIT: I replaced the cam seal was super easy. But still got a leak... looks like it is coming from the right bolt/nut I circled in red in the below image. I'm not sure how it would be leaking there but I am pretty positive thats where it is coming from because I can wipe it then let it run and it will slowly build up there. The nut seems pretty tight but was curious how tight it should be and if that is why it would leak there. Anyone know the torque amount for that?

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Hello all first post here. We just got a 72 CB350 Twin, The left side Cam/Points Cover has a nipple that a hose connects to. It leaks where the hose connects because the nipple pushes inside the cover.

I did some research and looked at pictures of other CB350's and none of the ones I seen have this nipple and hose. Is this from a different bike or something. I also looked for new ones and found some on ebay and none of them have this so just curious if it is supposed to be there or not.

IMG_20120624_162830.jpg


And a pic of the bike...

5Y65Jd5M53Ed3K13F3c6j5fe86aa22207140a.jpg
 
what is it leaking .. oil>???? it should not have any type of oil in that chamber. I haven't seen that on any 350 and not on mine for sure that is a dry area without any tubes coming out of it. Have you removed the cover what is in there is there oil leaking around the cam? seems like PO must of fashioned that to compensate for oil leaking into the chamber to drain it to the rear of bike and not all over the engine. WHY IS OIL GETTING IN THERE IS THE BIGGLER QUESTION.
 
Yea I will go take it off and look at the lobe try and see where it is actually coming from...

But yea it is oil not a lot just a little bit. I took it off the other day and it was dry inside so seems odd.

I will take a pic with it off to see if anyone notices anything funny.
 
Here is a pic with it off and the cover.

I started it with it off to try and inspect where it is coming from and it slowly builds up on the bottom but can't tell where it is coming from. You should be able to see where it is building up slowly.

I put some gasket sealer on the nipple on the inside that is the blue stuff was hoping it would seal that up but still seems to be leaking though it.

Also there is a gasket I pulled it off though because it seems to be getting behind the gasket so wanted to clean it off maybe get a better seal. Still not sure how oil is getting there though.

IMG_20120625_100526.jpg

IMG_20120625_100530.jpg
 
The leak is coming from either the cam seal or behind the points housing at the rocker spindle o-rings. To replace both you need to remove the points housing, it's bit of a task.
 
Holy shit what kind of redneck engineering is that?

My guess is the oil seal on the camshaft (where it comes out of the head for the points) is leaking. So instead of fixing that, the PO just hooked up that hose so it would drain out instead of filling up that space.

Oh please tell me that the hose ends just over the chain. Auto Chain Oiler! Genius!
 
Flugtechnik said:
Holy shit what kind of redneck engineering is that?

My guess is the oil seal on the camshaft (where it comes out of the head for the points) is leaking. So instead of fixing that, the PO just hooked up that hose so it would drain out instead of filling up that space.

Oh please tell me that the hose ends just over the chain. Auto Chain Oiler! Genius!
Click to expand...

HAHA I know right. But nope they were even more genius and have it dripping right on the exhaust if it actually went into the hose like they wanted. Instead it leaks through the hole they must have made because it is larger than the nipple they put in it. Looks like it is time to replace cam seal...

Where is the best place for parts for these bikes? I plan on getting another one, this one is actually my GF's.
 
If you're replacing the cam seal, make sure to also replace the spindle o-rings since you're there and you'll need a new gasket.
 
El_capitan said:
A quick heads up the superseded p/n for the cam seal is wrong.. I have the correct one at home if your interested
Click to expand...

How much? You can PM if you want. And why would the number be wrong did they change them or something?
 
lol, that's the best thing I've seen in a long time! if your cam seal leaks oil, don't replace it, install an oil drain hose!!!! priceless!
 
bowenac said:
How much? You can PM if you want. And why would the number be wrong did they change them or something?
Click to expand...

The new one is a bit to narrow and mine still leaked. Oddly enough Honda still makes the correct one. But its used as a crank seal for a small engine. Ill grab the number when I get home.
 
El_capitan said:
The new one is a bit to narrow and mine still leaked. Oddly enough Honda still makes the correct one. But its used as a crank seal for a small engine. Ill grab the number when I get home.
Click to expand...

Do you still have this?
 
Shit I've had to work late the late couple days and got distracted by alcohol when I got home lol
OK the number's are as follows..

Original 91202-286-023
Superseded 91251-KM1-003 (that is a millimeter too thin)
And the Honda power equipment the one that works 91202-ZE6-003
You probably will have go to a dealer that sells Honda power equipment.
Or if you want, the measurements of the seal 22X35X6 and you could probably find one online.

Cheers
 
Cool thanks just ordered one from local honda shop was $7.37 after tax.

Do you know of any diagrams or guides to replacing these? Or any tips while doing it?

I have a clymer manual but don't see anything about replacing cam seals in it.
 
Do you have manual? If not get one. It's pretty easy to do most things on a 350. You will have to remove the points block which means resetting the timing and probably the point gap.
 
Replaced the cam seal was really easy. But once I took everything out the seal looked fine and I noticed it is actually coming from the nut that bolts it to the head. You can see it in the first post circled in red. I decided to go ahead and replace the seal anyway. I did tighten the nut a little bit and seemed to slow it down but wasn't sure how tight you are supposed to tighten those nuts. I could probably tighten it more but don't want to snap the bolt or something stupid haha.
 
You don't happen to know part numbers for those do you or where to get some. I have also read about those o rings leaking and that they are an odd size.
 
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