W124 M103 Piston Removal?
 

Hello,

I am planning to replace the piston rings on my 260E

Engine is out of the chassis, Have full access to the crank plus everything else. I have referred to factory maintenance manuals about taking the pistons out. I'm just wondering if anyone has done this kind of job before? Is it relatively easy to get the piston rings off?? Does the conrod come right up through the cylinder so you can remove the whole piston assembly as one?

My main question is what should I be looking out for on the conrod bearings, can they fall/slip out once un-bolted?

Any help is much appreciated :))

I see you have two threads running side by side.

It sounds like you are not planning to remove the head. Whilst you might be able to drag a piston out through the bottom of the engine you will have a miserable time trying to fit it again. Pistons should be removed and replaced via the top of the engine. Remove the head and save yourself a lot of trouble.

Furthermore - assuming the bore diameters of the cylinders are still in specification - if you replace the rings without honing the cylinder walls you stand a good chance of having poor compression and high oil usage.

When you remove the caps of the connecting rods make sure the sharp corners of the connecting rods do not scratch the journals of the crankshaft during removal or refitting.

Link to other thread => http://www.peachparts.com/shopforum/tech-help/362288-m103-engine-timing.html