Help on 240d sleeve job

[Stevo]

I am trying to decide where to take my block for sleeves. I am doing a rebuild on my "80" 240d. I have taken the crank in for reconditioning and am doing the valves with the help of a MB tech friend. I took the block to a local mechanist for boring and found out it must be sleeved. The shop that did the crank has not done a MB but have done other diesels requiring sleeves and has a good reputation in general SOOO my questions would be 1) would you more experienced guys consider a shop like this and if so what would you ask them to do other than the sleeves? 2) In other words is doing a MB that different ?

[stevebfl]

Have you already bought your pistons? The efficient way to restore the bores in 615 through 617 engines is to buy oversize pistons and rebore the existing sleeves oversize. If you come to a cylinder that doesn't clear with the .5mm overbore then put a sleeve in that hole and bore it to the oversize piston. The sleeves have to be bored to get them out and the new ones have to be bored and honed after installation. The sleeve could care less what size you bore it to.

The straight boring job is a third or less of the boring and sleeving operation and you don't have to buy sleeves. There is no down side.

[Stevo]

thanks for the reply. #1 was found needing to be bored out 0.30 which should be more than the .6mm needed for the over sized pistons. I was told that cylinder had the most wear. So you are saying to just sleeve the holes that need it and use the oversized pistons. no I have not got the pistons yet. Do you think this job has a good chance of being done right by a shop that has not done MBs but has done other brand diesel sleeves and has a good general reputation?

[stevebfl]

We use a local machine shop that does lots of heavy diesel work. The machining is pretty straight forward although the clearances are much tighter; 0.0008 -0.0012 if I recall.

I believe that a good machinist with a good boring bar that registers on the main bearing centerline such as a Rottler can do a good job with this block. Although there are sleeves, they are just press in sleeves like the use from time to time to repair all sorts of engine blocks.

I really prefer to bore and use new O/S pistons rather than sleeve back standard and reuse the pistons. The pistons are heaviliy stressed in a diesel.

If number one is too worn, they can run a bead down the liner, collapse it, get it out and put a sleeve only in that hole, no problem. That way all cylinders will take the same size piston.

Also, beware that there are two piston types and two prechamber types, make sure the prechamber and pistons match. The crown of the piston is different and must be used with the correct prechamber.

Good luck,

[Stevo]

Thanks for all the help. I sent the block in and will bore and sleeve where needed for O/S pistons