Yes. The last revision of the OM603 head, casting #22, has a modified oil passage. The previous castings were mostly open to the head gasket, and sometimes the gasket would blow out into the timing chain cavity and #1 cylinder. The new casting moves the passage internal to the head with a hole at either end. In retrospect, I don't understand why it wasn't designed like that in the first place. A photo of the heads side by side, showing the oil passage difference, is here:
<http://www.w124performance.com/images/OM603_head_replacement/heads-front.jpg> :) -Dave M. On 12/26/05, dave walton <[EMAIL PROTECTED]> wrote: > I used a dial indicator with a magnetic base to measure how far the > top of the pistons protruded from the block. Bent rods don't come up > as far. Also measure the roundness of the cylinders at top, middle, > and bottom. > > Didn't Mercedes change the oil passage in front of the #1 cylinder on > the 603.97x heads in the latest versions? > > Thanks > > -Dave Walton
