Ok, so new development. 2 pistons (#2 and #7 which are opposite each other) are missing carbon build up on the edges where the scoring is. These 2 cylinders have more scoring than the others. I’m thinking oil is getting by the rings on these 2 cylinders. Upon further inspection, when I turn the crank and these pistons are travelling on the down stroke, I push on the top of the piston and there is a clunking sound. There is maybe a 1/6 to 1/8 of play. This happens on both of these pistons but none of the other pistons. Maybe bad rod bearings or wrist pin issue??
Here is a link to a video of the piston vertical play and some photos of the top of the pistons.
Anyways, tearing down the block, attempting the Sunnen AN-30 and reringing seems inevitable.
A few questions for you guys that I’ve heard mixed opinions on:
- Has anyone tried honing/reconditioning cylinders with the Sunnen AN-30?
- Are there special rings required for Alusil Blocks or will standard rings work? The factory ones are super expensive.
- Any suppliers for the Sunnen AN-30 in Canada? I do have a US address to ship to as well.