1951 Cub Engine Rebuild Questions - 3

Posted by Kurt in Va Beach on September 28, 2006 at 19:25:26 from (4.136.27.222):

I have a 1951 Cub I am rebuiding. It is now in about 800 pieces and I am working on redoing the engine and have 3 questions. I'm reading "How to rebuild and Restore Farm Tractor Engines"
1. Should I get the crank reground - My dad and I mic'ed it and where piston 3 connects, is a slight grove - about .0025" higher then the rest of the crank on that section. The crank for piston one (P1) is 1.4990, P2=1.4980, P3=1.4950 ridge 1.4975, p4=1.4980. Journal 1= 1.623, J2=1.623, J3=1.623. Overall looks pretty good.
2. Should I get the Cylinders rebored? Measurements are (Avg of 4 measurements each: top below ridge, middle, bottom: C1-Top = 2.6353,C1-Mid = 2.6308,C1-Bot = 2.6283, C1-Avg = 2.6314 : C2-Top = 2.6405,C2-Mid = 2.6303, C2-Bot = 2.6278, C2-Avg = 2.6314 : C3-Top = 2.6420, C3-Mid = 2.6363, C3-Bot = 2.6280, C3-Avg = 2.6318 : C4-Top = 2.6418, C4-Mid = 2.6363, C4-Bot = 2.6285, C4-Avg = 2.6319
3. Are the Cylinders surpose to be tapered? The bore is larger at the top then at the bottom. Is this just normal wear? Overall the Bores look great, very little ridge on each, no scoring, look like just need honed, but depends on answer to number 2.
Sorry this is a bit long, and thanks in advance for the assistance - Kurt

Replies:

• Re: 1951 Cub Engine Rebuild Questions - 3 the tractor vet 19:59:25 09/28/06 (1)
  • Re: 1951 Cub Engine Rebuild Questions - 3 Kurt in Va Beach 11:28:52 09/29/06 (0)

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