250 Pro XS sleeves turning

[LongShot]

Bought a motor knowing it had a sleeve turned. Low hour rig. Come to find out two are turned and it had already been down once before due to a sleeve being turned enough to catch a ring. What's up with these motors??

[EMDSAPMGR]

We had a brand new 225 Opti a few years ago. Turned sleeve. Factory replaced the whole powerhead under warranty. How old is this block? Have you asked your dealer to contact Merc Tech Service?

[LongShot]

This block is a 2011. Already had work done on it when I got it. It is a 250 XS Sport.It has at least three sleeves with issues. Two turned now and looks like one that had turned before and was replaced.

[Chaz]

Like any aluminum block with steel sleeve's in it . Need to warm up a little before you get on the gas ...

[H2OPERF]

Sad thing is it would be so easy for the factory to make the sleeves with a tab or make the block with tabs in the bottom to keep them from migrating around. I have pins in the bottom of my omc just in case. Dave

[TEXAS20225]

YEP i know all bout it here is what i did, i sent it to my machine guy and had him remove all sleeves because there was not enough interference between sleeve and holder i had it bored out for oversize sleeves he added more interference it never happened again plus i bought six new advance sleeves with the most aggressive porting available. but mine was a efi

[LongShot]

YEP i know all bout it here is what i did, i sent it to my machine guy and had him remove all sleeves because there was not enough interference between sleeve and holder i had it bored out for oversize sleeves he added more interference it never happened again plus i bought six new advance sleeves with the most aggressive porting available. but mine was a efi

I think this is the only obvious fix. I have had cast sleeved 2.5 Drag motors I did with .005" interference fit turn 10,300 rpms with 240 PSI cranking compression and never turned a sleeve. Just wondering too if not having the head gasket ring seal bearing on the sleeve itself has something to do with it. I have seen them pinned by machining in a hole that catches the block register and sleeve and I have seen them installed using Loctite retaining compound with decent results. Best fix is a .005" interference fit. On an Opti I don't know about messing with port height. Probably better to stay stock??

[baja200merk]

Flanged sleeve helps too. The newer BRP blocks only have about .003 interference but they rarley turn with the flange clamped.

They do usually have terrible glue lines closing half the port though

[racer]

Tighter fit also allows for better heat transfer.

[LongShot]

Glue?????? Hmmmmmm.......do tell more.

[baja200merk]

Glue?????? Hmmmmmm.......do tell more.

No it's from casting the block. Not gluing the sleeves in

[Chaz]

No it's from casting the block. Not gluing the sleeves in

Don't worry , soon as he yank's a sleeve out of that Merc block , he's gonna say .. WTF are all these grapes doin in here ..
BRP ain't the only ones that pour a POS block ...

[TEXAS20225]

no glue just good machine work there is no good heat transfer with out sleeve making full contact with holder

[TEXAS20225]

this is why some folks keep popping the same hole after boring it out to.015 then .030 then boom again same hole james perry is so good on this he heats up my blocks with the holes up if he see's a bunch of goop in the floor after heating it up!!!! its well there must be a space between something where did this oil come from so he pulls it and guess what space behind sleeve 6-9 thousandths out of round so over size sleeve i can say this since he has done this for me in the last 3/4 years zero blown motas knock on wood

[powerabout]

how much interference for an OMC sleeve?