cylinder sleeves

[boatmoter1]

what is involved in changing the cylinder sleeves in a evinrude outboard??<br /> I have replaced wet and some dry sleeves in diesel engines, wet sleeves knock right in and dry sleeves have to be frozen and the block heated.. what about on a outboard??

 

[Dhadley]

Re: cylinder sleeves

There are several types for outboards. Replacement, cast in, chrome bore, borable aluminum etc. What motor are we talking about?

 

[boatmoter1]

Re: cylinder sleeves

evinrude-140hp-1978- crossflow,I see the sleeves are inexpensive.thought I would find out whats involved in replaceing them..

 

[rodbolt]

Re: cylinder sleeves

bore the old ones out, press the new ones in and drill the ports. its easy.<br />just takes a bit of practice, some traing and a few special tools.

 

[boatmoter1]

Re: cylinder sleeves

about,how much pressure is used to get the sleeves to move while pressing them in?? <br /> Also are you useing a metal rasp on a air tool to get ports to proper size after drilling??<br />Last question.. do the sleeves bottom out in the proper depth when pressing in??<br />I lied,one more question,1978 evinrude,140hp,use-,fish & ride, which type of sleeve would you recommened useing??

 

[boatmoter1]

Re: cylinder sleeves

Is it true that wisco makes 0.44 & 0.64 oversize pistons?? and would you recomend boring the sleeves out to 0.64 ? or will it be a little too thin?

 

[Dhadley]

Re: cylinder sleeves

You cannot bore that motor out that far but you can bore it to .044 and .064.<br /><br />Just kidding! We know what you meant. Its suggested that when boring that far you re-center rather than follow the cut thats there but thats no big deal for the machine shop. You should not have any problem if you do have to go that far.<br /><br />Just make sure that you use the 3173 series with todays fuel. Not the old 3073 series pistons.<br /><br />As for sleeving, we use a .004" interference fit on that block. We heat the block and freeze the sleeve. The replacement sleeve is pressed in before the block cools or the sleeve warms up too much. The block is then jigged up in a mill to cut the ports (This is something you dont want to mess up!). Once the porting is done the top of the sleeve is cut to deck level. Nothing is removed from the deck height. Then the sleeve can be bored and honed to standard.

 

[walleyehed]

Re: cylinder sleeves

its easy.<br />just takes a bit of practice, some traing and a few special tools.

<br />My next brewski, I will "toast" to that...

 

[boatmoter1]

Re: cylinder sleeves

you are saying a .004 interference fit on the block? is that the same as piston to cylinder clearance?? (still trying to determime about <br />how much oversize I need)cylinders have a lot of slop and thier already .035 over..need to know what spec's you guys use to measure piston to cylinder clearance from minimum to maximum.. <br /> <br /> Thanks.... you guys are A LOT of help...

 

[walleyehed]

Re: cylinder sleeves

You don't "fit" the piston to the cylinder...<br />If you are going to .044 over, they machine it to 3.544.<br />For the most part, piston to cylinder clearance is built into the piston.

 

[Dhadley]

Re: cylinder sleeves

Youre asking two different things and I think youre getting confused. Resleeving is one thing and boring is another. <br /><br />Yes, when installing a replacement sleeve we use an interferance fit. A moving sleeve is not a good thing.<br /><br />As Kenny said, the piston clearance is built into the piston. A non-moving piston is not a good thing.<br /><br />For a .044 os piston the bore should be 3.544-3.545. I'd try to hit 3.5445. A lot depends on the set up, the fuel you plan to use and the plugs you plan to use.

 

[boatmoter1]

Re: cylinder sleeves

my question is answered.. Thanks..<br /> <br /> my pistons and sleeves are sloppy..<br /> I have about .060 gap bettween the pistons and sleeves.. the cylinders are already .035 over..<br /> Now I know I have to resleeve...

 

[Dhadley]

Re: cylinder sleeves

I guess I missed the point but why not bore it?<br /><br />You can find another block for 1/2 the cost of resleeving 4 holes.

 

[Paul Moir]

Re: cylinder sleeves

I wonder if he's measuring the gap at the piston's crown...?

 

[Dhadley]

Re: cylinder sleeves

I'm sure he is Paul. I've never measured that but I bet it would be close to what he sees. I'm just curious as to why it was bored to .035 to start with. But regardless of why, it should clean up at .044 or .064 for sure.<br /><br />I'll bet the idle wasn't too good with .030 pistons in .035 holes.

 

[boatmoter1]

Re: cylinder sleeves

I took feeler gauges and slid it down bettween the piston and cylinder the full lenth of the gauges (about 2 1/2 inches), rings are off..<br /> the sleeves are already been bored .035,according to the stamps on the piston's,and with .060 clearance plus the .035 that its already oversized to,thats .095..<br /> Am I right,if not,save me some bucks..<br />Last I checked,oversized pistons come up to .064.. that would leave .031 bettween the pistons and cylinders,and I understand that the clearance on new should be around .001 to .01.5 .. If I figured this wrong,please let me know...save me some bucks..

 

[boatmoter1]

Re: cylinder sleeves

And your right.. it would not idle below 1000 <br />rpms,it would just shut off..

 

[moderator1]

Re: cylinder sleeves

Didn't know there was such a thing as .035 over for these???<br />You're not understanding what "over-size" means.<br />over-size is diameter "over" STD bore diameter.<br />.035 over would only be .0175 on each side, or all the way around.<br />Boring .064 over would still leave plenty for a good piston fit, in fact, I'm not sure .044 wouldn't take care of it. The bore needs to be properly measured. It really has nothing to do with the piston/clearance at this time.

 

[boatmoter1]

Re: cylinder sleeves

Thanks... I have a bore gauge on the way.