I appreciate the info. I'm a novice here also but I love tinkering. From your description I thing I can handle it. One thing I'm totally in the dark about is do I need to replace the rings during this procedure. Are the rings normally replaced anytime the cylinder is opened like this even if they are not damaged? Here is a copy/paste of the post where I sourced the bearing. Thanks for your help.
Yep Aleman hit the nail on the head here I do believe, sounds like the wrist pin bearing/upper bearing.
Don't run that engine anymore until you replace it because if it fails you will be rebuilding the entire top of that engine at the very least.
Here is a link to motion industries were you can at a very small price get a replacement bearing that is much higher quality than the ones that come in the engine and the ones most MB site sell as replacements because they are just the same stock soft weak bearings that may hold up a long time or may not.
here is the link:
Motion Industries - Product Search --
if it doesn't show the bearing info. just type KBK 10X14X13 in the (SEARCH BOX) and the choose (Manufacturer Part Number) in the next box and then leave the last one at (All Manufacturers) and just move over and click the GO button, you will now see the bearing details but NO Price will be listed you will need to either call or just go to a local Motion Industries and they will order the bearing for you, I ordered 6 of them back in june of this year and they were $3.69 each, there is a K 10X14X13 also but the KBK is the best of the two, get one of these in that engine and you wouldn't have to worry about that issue any more, and while you're at it you may as well pick up a couple of higher quality crank seals for when you need them for only $2.74
Seal # and description is...
SKF Sealing Solutions
17X29X5 HMS5 RG GREY NITRILE SEAL
17x29x5 RG Oil Seal - Metric SKF# 563933
Item No. 02508698
the picture that is shown of the seal on the motion industries site is the wrong picture so dont be concerned about that, but the seal is the correct seal.
Again.........!!!! DON"T.........!!! run that engine with that rattle in the top...... just go to one of the local vendors on the forum like Thatsdax.com and order a new (correct) either 6mm or 8mm stud size jug to case gasket if you dont have the tools to make your own and order the bearing from M. Industries and you can have that thing going again in no time.