XL 12 piston

[Vman]

i just recieved a piston set for an XL 12...the piston (made by tecomec) has a "nib" for each piston...like an indexing point for ring placement.....and they are both in the same location for upper and lower ring (one is right on top of the other)...being this way, there is no way to alternate the ring gaps 180 degs....both rings will have the gap in the same spot.
this is gonna be my first piston job on a chainsaw so i want to check if this is the "norm".

 

[HiOctane]

The norm is usually the rings are indexed.What about the old one ,indexed ?It would be more efficient if indexed logically.

 

[Vman]

i haven't taken the XL 12 apart yet so i don't know how it is indexed. i just found it strange that the new piston is indexed in the same spot of both rings. it just seems odd and am trying to find out if this is normal for that saw, or any saw for that matter.
thanks

 

[Dan Forsh]

Logic would dictate if that's the way it's made, then that's the way it's made.

The rings will, if supplied with the piston, have a cut out on the ends to suit the nib.

 

[Vman]

yes, i agree about the logic...i just find it strange about the placing...gonna try to see if can get a decent pic with my camera and post it so you can see exactly what i am talking about.
thanks for the replies.

 

[Vman]

here is a pic of the nibs i am talking about. there are not cut-outs in the rings (supplied with the piston) which leads me to believe the ring gaps must be placed there. i guess i will find out for sure when i take the saw apart, but would like to hear from anyone with info..thanks again.

 

[Mike mandry]

Yes, the XL-12 & SXL do not have the ring gaps indexed. They are in line.

That Tecomic kit is the larger bore (1-13/16 I believe)

The XL-12 was 1-3/4" bore, so your saw will have a tad more dispacement when you are done.

 

[Vman]

Yes, the XL-12 & SXL do not have the ring gaps indexed. They are in line.
QUOTE]

i hope that is a typo or i'm gonna be really confused now..LOL
"do NOT have the ring gaps indexed." please tell me you meant "they DO have the ring gaps indexed and they are inline"...or maybe i do not understand what you are telling me?

 

[ross_scott]

Indexing means the gaps in the piston rings sit away from each other (ring gap on one side and the other ring gap opposite or further around from the gap of the top or bottom piston ring). I think that is what indexing is on about guys feel free to correct me if I am wrong.

 

[Vman]

hmmmm, ok, i was thinking indexing meaning the nibs are the indexing point of the rings.

 

[Mike mandry]

In short, what I was trying to say is that your new piston from tecomic is exactly like it is suposed to be. Just like the OEM one.

Sorry for any confusion.

Mike

 

[Vman]

ok, thanks for that info, i am hoping to do the job next weekend.

 

[lesorubcheek]

Hi Vman,

Just wanna emphasize what Mike said previously. If you've got a piston for a Super XL, and your's is not a Super, the piston is BIGGER... which means it won't fit in the same cylinder. If you have a piston/cylinder set, then no problem, but if its a piston only, that's another story.

Dan

 

[Vman]

Hi Vman,

Just wanna emphasize what Mike said previously. If you've got a piston for a Super XL, and your's is not a Super, the piston is BIGGER... which means it won't fit in the same cylinder. If you have a piston/cylinder set, then no problem, but if its a piston only, that's another story.

Dan

ouch!! i was told this piston was for the XL 12 and the Super XL, if this is not the piston i need, please tell me so i can send it back.
thanks for the info!

 

[Mike mandry]

Do you have a piston & cylinder, or just the piston ??

If you have the set (piston/cylinder) they will work just fine on your XL-12

If its a piston only, chances are it is 1-13/16 bore so it will be too large for the XL-12 (1-3/4 bore)

How much did you pay for the piston ?? i might be interested if its the wrong one & you want to get rid of it.

Mike

 

[Vman]

MIKE.... i just bought the piston kit (piston, rings, wrist pin, and clips).
i sent you a PM