1972 (not 1792) cl350 cylinder head o-rings?

fluke12

Been Around the Block
Putting my engine back together after a long time of it sitting. Reading my clymer manual it says to replace the o-rings or it will leak oil.

1, I don't remember ever seeing these rings in the first place, I'm assuming they are necessary but I never saw an oil leak?

2, anyone have an idea of the correct size? I had a few small ones that I tried and they seem to hold the cylinder head too high to seal.
 
Re: 1792 cl350 cylinder head o-rings?

Are you talking about the o-rings under the cylinders? If so, #6 here: http://www.cmsnl.com/honda-cl350-scrambler-350-k4-1972-usa_model549/partslist/E05.html#results
 
Re: 1792 cl350 cylinder head o-rings?

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Here is the o-ring I was referring to. I haven't seen it on any other schematic online that references it though. Funnier than that, when talking about installing the actual cylinders it doesn't say anything about the o-rings you pointed out.
 
Re: 1792 cl350 cylinder head o-rings?

Also, I don't think the o-rings you pointed out were in the engine but I believe they're in the Athena full engine gasket set.
 
Re: 1792 cl350 cylinder head o-rings?

http://4into1.com/genuine-honda-cylinder-stud-gasket-12909-428-003-cb350-cl350-cb360-cb450-cl450-cb500t/

These?
 
Re: 1792 cl350 cylinder head o-rings?

Hahahahhaha. Took me like 5 min to get the joke. I'll have to change the title when I get a chance.

The description sounds right VON. From the picture in the book, it seems like they should snug down around the cylinder stud in between the gasket and post which seems like it would be in the way once the head goes on.
 
Yeah, just trying to figure out if the previous owner forgot them and that's what ended up eventually leading to my burnt pistons or I just go lucky and he somehow still got a good seal. It's not like the whole thing was coated oil.
 
fluke12 said:
Yeah, just trying to figure out if the previous owner forgot them and that's what ended up eventually leading to my burnt pistons or I just go lucky and he somehow still got a good seal. It's not like the whole thing was coated oil.

those seals being bad can lead to external leekage but it is impossible for the oil to get to your pistons
 
That's what my machine shop called it. Basically some scaring on the aprons of both pistons. Ended up boring out the cylinders and replacing bent exhaust valves. Now I'm just trying to get it all back together in the proper way
 
fluke12 said:
Anyone ever leave off the big ones that go to the cylinder that herrDeacon pointed out?

Those are necessary. Although a bead of sealant could probably be just as effective.
 
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So I'm assuming this gap means I don't have the o-rings under the cylinders installed quite right and not that it's not just tightened down. Anyone have any tips on how to get these in?

Also, the clymer manual calls for gasket cement on some gaskets specifically but not on others. It's very obvious that the previous owner used it everywhere. How do you guys handle it, grease or cement? One side, both sides, only on the ones specifically mentioned or all?

I appreciate all the help.
 
Looks like you just need to lightly tap it down onto the locating dowel. As long as the o-rings at the base of the cylinders are touching the bottom of the jugs, they're installed fine.

No sealant here or on the head gasket or the cam housing. You don't want it to block or come loose in the oil channels. The place you really use it would be the crankcase halves. I can't think of anywhere else I use it.

Check that your chain slippers are installed correctly in their slots.
 
Funny because this is one of the places the manual specifically says to use gasket cement.

It's definitely being held up like that by the o-ring. When I push on it, it gives like rubber then bounces back. I can't imagine this is something that works itself out when I tighten down, right? I mean, it seems like it should be flush before I move on?
 
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