Mark,
Mark,
Over the years I have overhauled a fair number of Engines mainly small to medium Diesels (1 to 8 cyl). I have only come across a "shimmed" big end once it was on a medium sized Ruston Engine. It did not seem a "Bodge" repair as the shims were fitted correctly and shaped accordingly. I know it was common practice to shim plain bearings on many other applications.
What thickness is the shim ? If it is only a few thou. it may be worth considering discarding the shim and scraping the bearing to fit the shaft.
When I fitted a Pheonix C/Shaft to my engine I made a mandril crankshaft size less 0.0005" and had it hardened & ground. I scraped all the rods to this and then finally scraped them to the New Crankshaft so the rod just fell under it's own weight when tightened. For what it is worth, my preference is to use a small 3square (triangular) scraper to do this. Always keep it sharp, giving it a wee rub up on a fine oil stone now and again, and don't try and use it blunt.
Mark,
Over the years I have overhauled a fair number of Engines mainly small to medium Diesels (1 to 8 cyl). I have only come across a "shimmed" big end once it was on a medium sized Ruston Engine. It did not seem a "Bodge" repair as the shims were fitted correctly and shaped accordingly. I know it was common practice to shim plain bearings on many other applications.
What thickness is the shim ? If it is only a few thou. it may be worth considering discarding the shim and scraping the bearing to fit the shaft.
When I fitted a Pheonix C/Shaft to my engine I made a mandril crankshaft size less 0.0005" and had it hardened & ground. I scraped all the rods to this and then finally scraped them to the New Crankshaft so the rod just fell under it's own weight when tightened. For what it is worth, my preference is to use a small 3square (triangular) scraper to do this. Always keep it sharp, giving it a wee rub up on a fine oil stone now and again, and don't try and use it blunt.