engine question

[J Mills]

after sitting indoors for many years an engine in a sedan I bought seemed to be in running condition. Compression tested good so I pulled the engine, cleaned it up and painted the engine bay and reinstalled. after a few starts and warm ups all seemed fine. The other day I was finally ready for a test drive and while warming up, the engine started leaking oil ( alot ) from the rear of the cylinders. I pulled the top end and found the problem... this was an early engine and was missing the 2 O rings on the rear inner studs. Looking at the layout I don't really understand where the oil path is coming from. does it travel around the base of the cylinder in that little groove. The engine appears that in was run at least for a few thousand miles prior to being parked. Weird that it let go now. A nice surprise was all the rubber rollers and chain guide appeared brand new and still soft. I do have a later style cylinder and pistons ( although not in as good of condition ) is it advised to switch over to the later design. It appears Honda didn't use the early cylinders very long. Will the O rings eliminate all chances of leakage up the studs and out of the engine. For those that don't know - those two studs are not shrouded and are open to the atmosphere in the early design. Any suggestions??

[friend]

Either will work, O rings at the base of the cylinders or use the other cylinders, just make sure the fit is right.  Some sealant can be used but make sure the O rings are on top of the lower cylinder gasket.
Bill

> -----Original Message-----
> From:
> 2cylinderhondas@yahoogroups.com [mailto:2cylinderhondas@yahoogroups.com] > On > Behalf Of > J Mills > Sent:
> Wednesday, September 21, 2011 10:47
> AM
> To:
> 2cylinderhondas@yahoogroups.com
> Subject:
> [2cylinderhondas] engine question
> after sitting indoors for many years an engine in a sedan I bought seemed > to be in running condition. Compression tested good so I pulled the engine, > cleaned it up and painted the engine bay and reinstalled. after a few starts > and warm ups all seemed fine. The other day I was finally ready for a test > drive and while warming up, the engine started leaking oil ( alot ) from the > rear of the cylinders. I pulled the top end and found the problem... this was > an early engine and was missing the 2 O rings on the rear inner studs. Looking > at the layout I don't really understand where the oil path is coming from.
> does it travel around the base of the cylinder in that little groove. The > engine appears that in was run at least for a few thousand miles prior to > being parked. Weird that it let go now. A nice surprise was all the rubber > rollers and chain guide appeared brand new and still soft. I do have a later > style cylinder and pistons ( although not in as good of condition ) is it > advised to switch over to the later design. It appears Honda didn't use the > early cylinders very long. Will the O rings eliminate all chances of leakage > up the studs and out of the engine. For those that don't know - those two > studs are not shrouded and are open to the atmosphere in the early design. Any > suggestions??

[mygto_1999]

Are these o-rings used in a ’72 N600, I have my cylinders off now but I am not noticing them, maybe gunked up in oil?
Thanks,       Mike

[John Mills]

Only early engines used the O ring, so unless your engine or cylinder was replaced then the answer is no. look at the bottom of your cylinder, look for a recess for the O ring at the two rear inner stud holes. no recess = no O ring.
John

[feltonminicycle]

The sure way to tell is on the back 2 center studs....stick a screwdriver or similar something up in the hole, if you can see it through the fins then it takes the o rings. The orings seal the bottom of the cylinder otherwise oil will pour out the back of the engine.
Forgot to mention if anyone wants phone advice on anything mechanical but performance issues, you can call me XXX-XXX-XXXX days/eves. Honda 600 parts, service & advice since 1981 !
Miles

--- In
2cylinderhondas@yahoogroups.com
, jbmkwaj@... wrote:
> Only early engines used the O ring, so unless your engine or cylinder was replaced then the answer is no. look at the bottom of your cylinder, look for a recess for the O ring at the two rear inner stud holes. no recess = no O ring.
> John
> -----Original Message-----
> From: Mike & Tami Speer
> To: 2cylinderhondas Sent: Sat, Sep 24, 2011 10:25 am
> Subject: RE: [2cylinderhondas] engine question
> Are these o-rings used in a ’72 N600, I have my cylinders off now but I am not noticing them, maybe gunked up in oil?
> Thanks,
> Mike
> From:
2cylinderhondas@yahoogroups.com
[mailto:
2cylinderhondas@yahoogroups.com
] On Behalf Of billmyong@...
> Sent: Wednesday, September 21, 2011 11:34 PM
> To: Anzhonda600o wners@Yahoogroups. Com;
2cylinderhondas@yahoogroups.com
> Subject: RE: [2cylinderhondas] engine question
> Either will work, O rings at the base of the cylinders or use the other cylinders, just make sure the fit is right. Some sealant can be used but make sure the O rings are on top of the lower cylinder gasket.
> Bill
> -----Original Message-----
> Fr om:
2cylinderhondas@yahoogroups.com
[mailto:
2cylinderhondas@yahoogroups.com
]On Behalf Of J Mills
> Sent: Wednesday, September 21, 2011 10:47 AM
> To:
2cylinderhondas@yahoogroups.com
> Subject: [2cylinderhondas] engine question
> after sitting indoors for many years an engine in a sedan I bought seemed to be in running condition. Compression tested good so I pulled the engine, cleaned it up and painted the engine bay and reinstalled. after a few starts and warm ups all seemed fine. The other day I was finally ready for a test drive and while warming up, the engine started leaking oil ( alot ) from the rear of the cylinders. I pulled the top end and found the problem... this was an early engine and was missing the 2 O rings on the rear inner studs. Looking at the layout I don't really understand where the oil path is coming from. does it travel around the base of the cylinder in that little groove. The engine appears that in was run at least for a few thousand miles prior to being parked. Weird that it let go now. A nice surprise was all the rubber rollers and chain guide appeared brand new and still soft. I do have a later style cylinder and pistons ( although not in as good of condition ) is it advised to switch over to the later design. It appears Honda didn't use the early cylinders very long. Will the O rings eliminate all chances of leakage up the studs and out of the engine. For those that don't know - those two studs are not shrouded and are open to the atmosphere in the early design. Any suggestions??

[mygto_1999]

Thanks guys!, since that is why I have the top end disassembled I will check carefully so I dont end up with the same problem.
Mike

[jpro8071]

I lean toward swapping out the cylinders. If Honda switched and changed their production it was enough of a headache to merit a big expense for them.
I had nothing but headaches with the o-rings. (Somewhere I have a bag of them . . . )

--- In
2cylinderhondas@yahoogroups.com
, wrote:
> Either will work, O rings at the base of the cylinders or use the other
> cylinders, just make sure the fit is right. Some sealant can be used but
> make sure the O rings are on top of the lower cylinder gasket.
> Bill
> -----Original Message-----
> From:
2cylinderhondas@yahoogroups.com
> [mailto:
2cylinderhondas@yahoogroups.com
]On Behalf Of J Mills
> Sent: Wednesday, September 21, 2011 10:47 AM
> To:
2cylinderhondas@yahoogroups.com
> Subject: [2cylinderhondas] engine question
> after sitting indoors for many years an engine in a sedan I bought seemed
> to be in running condition. Compression tested good so I pulled the engine,
> cleaned it up and painted the engine bay and reinstalled. after a few starts
> and warm ups all seemed fine. The other day I was finally ready for a test
> drive and while warming up, the engine started leaking oil ( alot ) from the
> rear of the cylinders. I pulled the top end and found the problem... this
> was an early engine and was missing the 2 O rings on the rear inner studs.
> Looking at the layout I don't really understand where the oil path is coming
> from. does it travel around the base of the cylinder in that little groove.
> The engine appears that in was run at least for a few thousand miles prior
> to being parked. Weird that it let go now. A nice surprise was all the
> rubber rollers and chain guide appeared brand new and still soft. I do have
> a later style cylinder and pistons ( although not in as good of condition )
> is it advised to switch over to the later design. It appears Honda didn't
> use the early cylinders very long. Will the O rings eliminate all chances of
> leakage up the studs and out of the engine. For those that don't know -
> those two studs are not shrouded and are open to the atmosphere in the early
> design. Any suggestions??