Crankshaft Pics

[reynoldston]

In the very first post the OP stated that the journal was already .003 undersized. That was with the aluminum transfer still on. When removing that aluminum it will be even more undersize and there is no undersize rod available for that engine. Cleaning and putting in an original rod is throwing away money. It just won't last long enough to make it cost effective. Only smart way to savage this engine is to obtain a good crank somewhere and then install a new rod. In my opinion the OP would be better off finding a different engine to use on the unit.

I have installed undersize bearing inserts. And as I recall on some of the old engines the mechanic had to pour the bearings and then scrape them to fit. This is before my time so I never did it. What I have did was on the old Chevy engines they shimmed the rod caps. What has to be done with plasitgauge and it will give you your oil clearances. On the smaller engines I see most rods are made without bearing inserts and I don't know if you can buy them undersize seeing I never tried to buy one.

 

[Rivets]

95% of small engines do not use bearing inserts. Company's do make rods for crankshafts that become worn and need to be recut undersize. In this case there is no undersize rod available. As Reynoldston started plastiguage is a great tool to tell you the clearance between bearings and journals, but will not tell you if the parts meet specifications.

 

[tybilly]

I cheated,ive just taken my cranks to a napa engine shop,20 bucks cleaned up crank

 

[davbell22602]

I went ahead and bought that used crankshaft on ebay instead of trying reusing the one I have. So hopefully I have this up and running before we get 24in+ in deep snow.

 

[davbell22602]

Just to give an update. After finding a used crankshaft and bare block. I also bought new connecting rod, STD piston assy., crankshaft seals, and gasket set. Got the engine back together today. I went to today to look at friction disc drive on the 247.888500 snowblower. Found I need a new friction disc, new rubber wheel, and all 3 belts.