Yes, that is a fairly common problem on both the D2's and D4's that have the spring mounted to the engine/pan. Weld repairs have mixed success depending on how thin and how much damage.
Pistons, sleeves and rings are not a problem to obtain...it's the bearings that have become near impossible or extremely pricey if you find them.
Alternate source:
Zimmerman Engine Parts. (6/2/07)
Jim Zimmerman has the following new reproduction cylinder liners, plus pistons, plus rings, available (sold as a kit, all three parts per hole):
Sizes:
3 and 3/4 inch bore fits early D2
4 inch bore fits later D2
4 and 1/4 inch bore for the early D4, D6
4 and 1/2 inch bore for the late D4, D6
5 and 3/4 inch bore for the early D7, D8, and 3-cylinder D6 (2H series)
Also, starting engine pistons for D2 and D4, .020, .040, and .060 oversized; $80 each including rings.
Price for early D2 liner, piston, and rings, is $200 per hole.
Call for other prices.
(641) 982-4207 (voice)
(641) 982-4297 (FAX)
Jim does not have a computer and is not on-line to answer questions.