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[BayouBiker]

They did the base o-rings the 1st time around (wasn't leaking there), and stated they will do 'em this time as that's the only place they noted leaks from, but will also use the 'experimental' head gaskets, too.

I wonder how this fix will work when our weather hits 100+ this summer? 

[arcticdude]

It works great!  The oil on your legs helps your tanning process AND makes the bike shine!

[Twolanerider]

It works great!  The oil on your legs helps your tanning process AND makes the bike shine!

uh oh John, don't give HD any ideas... 



Screamin' Eagle spray on tan and external engine lubricator---58658-08.  $1099.95.  $1059.95 when supplied with Syn3T tanning agent.

[fxdsebeloved]

Maybe a picture will help.  As Chief pointed out, what we have been calling a [font=Verdana]"base gasket" is in fact an o-ring[/font] that fits in a machined groove in the crankcase.  The head gasket edge will be visible with the engine assembled, but you can't see the o-ring.  The only other seal at the base of the cylinder is at the oil drainback hole (oil from the heads drains down through the cylinders, into the left crankcase half, then over to the right crankcase & cam chest where it is picked up by the scavenge side of the oil pump).

Sorry about my previous non-precise use of the term "base gasket".  While the 0-ring is in fact a type of gasket, o-ring would have been the more correct term. 

If you look at the upper section of the attachment, you can see that the cylinder studs are outboard of the o-ring seal.  Any oil that makes its way into the stud holes at the top of the cylinder will seep out at the low side, since there is no gasket between those holes and the outer edge.

Hope this helps  -  Jerry

So now I know what NASA did with all those solid rocket "O-Rings" after the Challenger Disaster.. MoCo bought them...

[jpb]

I am preparing to do a complete top end job due to a rear cylinder leak on my 110.  I am in the parts acquisition mode right now and ordered the new base gaskets (o-rings) using the part number from the manual (10956).  I received part number 11907 ??  Dealer says 10956 is obsolete.  It is an orange o-ring of a silicone type composition.  It also has a square cross section instead of a round one.  Same goes for the dowel pins.

Since I have not yet disassembled mine I am not familiar with what is currently installed.  Does the stock o-ring have a round or square cross section ??

Thanks,

JPB   

[sadunbar]

I am preparing to do a complete top end job due to a rear cylinder leak on my 110.  I am in the parts acquisition mode right now and ordered the new base gaskets (o-rings) using the part number from the manual (10956).  I received part number 11907 ??  Dealer says 10956 is obsolete.  It is an orange o-ring of a silicone type composition.  It also has a square cross section instead of a round one.  Same goes for the dowel pins.

Since I have not yet disassembled mine I am not familiar with what is currently installed.  Does the stock o-ring have a round or square cross section ?? 
Thanks,

JPB   

The original stock base o ring has a round cross section.  Same goes for the original stock dowel o rings - round cross section.   I do not know if there is a revised square cross section seal ring released.


Not to complicate your thought process, but at the recommendation of Axtell and Wes Brown at Cycle Rama, when I rebuilt my 110, I used both the base and dowel o rings and the Cometic steel base gasket, along with some Gasket Cinch.  I also used Cometic head gaskets - used the Cometic torquing procedure, not the MOCO torque procedure.   (I also used Axtell cylinders.  The base mounting surface of the Axtell cylinders is the same as the base mounting surface of MOCO 110 cylinders.)

[ultrafxr]

I am preparing to do a complete top end job due to a rear cylinder leak on my 110.  I am in the parts acquisition mode right now and ordered the new base gaskets (o-rings) using the part number from the manual (10956).  I received part number 11907 ??  Dealer says 10956 is obsolete.  It is an orange o-ring of a silicone type composition.  It also has a square cross section instead of a round one.  Same goes for the dowel pins.

Since I have not yet disassembled mine I am not familiar with what is currently installed.  Does the stock o-ring have a round or square cross section ??

Thanks,

JPB   

11907 (base square rings) superceded the original p/n as per TT370, 5-13-08.  Now if that (11907) is what you should use if you're using aftermarket jugs like Axtell I do not know.  But if you're going back with moco jugs that would be the part you want.

[Chief]

11907 (base square rings) superceded the original p/n as per TT370, 5-13-08.  Now if that (11907) is what you should use if you're using aftermarket jugs like Axtell I do not know.  But if you're going back with moco jugs that would be the part you want.

I'm thinking that the new square o-rings are part of the mystery "parts-program" we're all anxiously waiting for, except if it's just different head gaskets and o-rings, I'm not going to be very thrilled. I want new hard, shiny metallic parts, not just a better o-ring.

[dparkinson]

So my 07 SEUC (9K mi) was in the shop from Jan 2-19 for base gaskets on up incl. leaking front & rear heads. (along w/ new battery, front turn signals, tour-pak hinge & liner, seat, hand grips and a few minor issues)

Put on a whoppinng 235mi, and guess what? The base gasket on the left side rear and in the V on the front are leaking. Took in in to the 'trainee' who worked on the bike and he brought out the shop foreman, who informed me that they just recieved a set of newly 'revised' base gaskets that don't even have a part number yet. (do they actually make this sh*t up?) He said the MoCo just happened to send them last week. (The week after my bike was 'fixed'...hmmm)

The first time around it took 17 days, now he says it'll take 2, plus gave me a Qt of Syn3 in case I run low before Monday!??!!
Wow, you'll meet the nicest people on a Harley. </sarcasm>

Anyone hear of these 'revised' gaskets?
or have cylinder base issues?

I had the base O ring leak show up at 10000 miles. Took the bike into the dealer for repair. Dealer "fixed" the leak. Rode my bike home and guess what... leaking again.Decided at that point top join the FTW club and had the engine rebuilt by my local indy. Bike runs great now...

[BIGDOG]

I just got my bike back a week  ago and the mechanic who I have worked with for about 8 years and seams very good told me the new base gasket has a larger cross section than the old one. He also said the head gaskets that are going out were a layered gasket with no compression ring on it.  The new gaskets are a solid piece and have compression rings built into them. I will be putting some miles on this weak end . we'll see what happens.

[ultrafxr]

I'm thinking that the new square o-rings are part of the mystery "parts-program" we're all anxiously waiting for, except if it's just different head gaskets and o-rings, I'm not going to be very thrilled. I want new hard, shiny metallic parts, not just a better o-ring.

Chuck, there have been so many posts about the 'fix' that I don't recall where I posted, but . . . I asked that question specifically - is this all there is in ref to the new base gaskets, head gaskets, ACRs and I was told NO, there is more to come.  But like you I'm getting damned impatient.  It has been over 60 days and that was the time frame told me.  So come on let's see what you got moco!

[Twolanerider]

Chuck, there have been so many posts about the 'fix' that I don't recall where I posted

http://www.cvoharley.com/smf/index.php?topic=22548.msg364426#msg364426

[hard10]

Chuck, there have been so many posts about the 'fix' that I don't recall where I posted, but . . . I asked that question specifically - is this all there is in ref to the new base gaskets, head gaskets, ACRs and I was told NO, there is more to come.  But like you I'm getting damned impatient.  It has been over 60 days and that was the time frame told me.  So come on let's see what you got moco!

I've just gone through all of my service orders to have the facts in front of me for the 18 months customer survey. Head gaskets, clearance rocker covers, ACR's, transmission compensator assembly, leaking inner primary twice, heated grips... I really hope that all of this time waiting for "the fix" has not been for a new gasket. That would be one more major disappointment.

[Chief]

I've just gone through all of my service orders to have the facts in front of me for the 18 months customer survey. Head gaskets, clearance rocker covers, ACR's, transmission compensator assembly, leaking inner primary twice, heated grips... I really hope that all of this time waiting for "the fix" has not been for a new gasket. That would be one more major disappointment.

Me too buddy. Me too!

[grc]

I'm thinking that the new square o-rings are part of the mystery "parts-program" we're all anxiously waiting for, except if it's just different head gaskets and o-rings, I'm not going to be very thrilled. I want new hard, shiny metallic parts, not just a better o-ring.

I'm guessing I've missed something along the way Chief, but what could the base gasket (O-ring) possibly have to do with fixing the head gasket leak issue?  The old design O-ring has been working fine for about 9 years now, so even though I personally like the idea of the square versus round cross section, I don't see what the big deal is.  And I'm with you, if Harley insists on just continuing to redesign gaskets and doesn't come up with some hard parts, then I'll be forced to believe what I suspected all along; they plan to pull the same chit on the customers that they've gotten away with on the old cam chain tensioners and the various other known defects they never corrected.

It's becoming more and more obvious to me that my next bike will not be a Harley.  I'd rather walk or ride a moped before I would let H-D stick it to me again.  I wonder if they make lowering kits for a beemer so my short legs will reach the ground?

Jerry