Pressing out a sleeve?

[barty5]

Ok so have one fucked barrel on old xr 250 found another to replace not sure yet odds are it will be over-sized past .25 which means it will be useless for the new piston we have in now fucked barrel which has just been re-bored ( before it became fucked thread broke out down the side of cam chain was a little doge to start with thought we might get away with it nooot)

Question is i want to press out sleeve and place into good barrel will doing this alter anything dimension wise im guessing it shouldnt but thought id ask if anyone has tried this before

[scott411]

i am pretty sure you will be able to go bigger than .25 on a XR250, most bikes you can go to at least .50,

best to talk to a engine reconditioner about replacing the sleeve,

[barty5]

can go to 1mm prob was already have brand new piston a the sleeve in stuffed barrel has just been machined. Anyway ive pressed out and found another barrel to transplant into so hopefully the heating process dont change anything. Was more out of not know having not pressed a sleeve before turns out it piss easy so far.

[crazyhorse]

1. Pull out ironing board
2. Plug in iron and start heating
3. lay sleeve gently along ironing board
4. begin ironing the creases slowly
ha ha ha ha:rofl:

[4stroke]

i used a 5/8 threaded rod (16mm) with a plate cut just under the size as the sleeve and a bigger one with legs down onto the block, screw the nuts up on the rod pulling the sleeve upward toward the top of the barrel, duno if it would work on the bike thom thats how i used to re-sleeve all the truck and heavey machinery motors i used to do.

[barty5]

good idea but used the 20 ton press and the oven to heat seam to work real easy comin out guess the hard part will be putting back together in replacement barrel should be here in couple a days

[Jinxycat]

1. Pull out ironing board
2. Plug in iron and start heating
3. lay sleeve gently along ironing board
4. begin ironing the creases slowly
ha ha ha ha:rofl:

dam, i almost spat out my coffee, lol

[camchain]

A bit of second hand info here, but a mate just did a sleeve swap with his spare barrel on his old-school TT500 engine. I asked the same question re possible dimensions diffs and suggested he measure everything, but the engine recon bods who did the sleeve swap reckoned no worries. They just gave it a light hone after swapping.

Incidentally, he was having big probs with blown head gaskets from studs pulling threads. I never heard about this before, but they tested hardness of spare/main barrels and apparently old engine aluminium parts get softer with age - presumably from multi heat cycles (and overheating like this particular one). His spare barrel was a fair bit harder. Maybe something to keep in mind when leaning on the torque wrench etc with old engines.