All Turns out there has been abit of an accident in the garage. the door got left open while the leaf blower went by and the towel(s) covering the crankshaft from dirt got blown off and now I've got dirt/dust all over the crank. Any suggestions on the best way to clean it? There is no way I can install it looking like this. Also, for rod bearing sizes - my rod journals on the crank are all within the 2.2491 - 2.2496 (measured both from 12-6 and from 3-9 o'clock), the old bearings are too toasted to use to get much of a reading off of. If I assume (i know, but just looking to get in the ballpark) that the inside rod dimensions are somewhat near stock at 2.3740 what size rod bearings do i start with? Standard? If I find out that I've got .026 of clearance or more after using the plasti-gauge w/ the new bearings do most parts houses allow me to exchange the bearing set for a larger size? New territory here, appreciate any help.
Simply wash in warm, soapy water using rifle cleaning brushes to clean oil passages. Blow dry. IMMEDIATELY followed by a CLEAN COAT of oil applied with a lint-free rag. Make SURE the new oil touches EVERY SPOT on AND inside the crankshaft!! This should be done before final assy. BTW, this can be done with ANY PART of the engine, as long as steps 2 and 3 are performed meticuously ! Hope this helps ya!
You said .026"-that's almost 1/32". I think you meant .0026". If you have a standard size crank that has never been ground undersize, and your original rod bearings did not have any undersize markings, you should be in the ballpark using standard bearings. Many factors come into play here, assuming your rods are OK. If you are not sure, send the crank out to be polished, cleaned, and checked. They will tell you what size bearings to use. It could be well worth the money you spend in the long run. Crankshaft bearings are a moot subject for me right now.:af:
Joe, You are correct, I did mean .0026. I think I'm going to send this out for polishing and cleaning. Crank appears never to have been out before. Std bearing half bearing has a thickness of .0618, but I've read that rod end is 2.3745 - 2.3750 vs the 2.3740 that I stated above. using the new numbers, a std bearing at .0618 * 2 = .1236, avg crankpin of 2.2493 - inner rod avg of 2.3748 leaves me with .1255. .1255-.1236 leaves me an avg overall clearance of .0019 which seems to be right in the ballpark for a starting spot.
Here is something i don,t under stand GM, FORD,CHY. have some of the best engineers on the planet now i know every one wants to make there car go faster but if you are building it for the street stay with what the factory uses for clearance. I see this every day in my shop the first things they want are racing clearances for the street.I,am not saying that is what you are doing i just had to get that out there.
I'm not sure where i went south on you, but I'm still within stock clearances aren't I? The Dove book shows rod clearances between .0002 -.0023. You're right that I'm wanting to keep this somewhat stock. Reel me back in if I'm off here
