I need some help with my crank bearings. I am doing a rebuild of a salvage motor. Let me preface my question with this: "I know that I SHOULD take this motor apart and check everything properly, but I am trying to limit my labor time on this."
OK I have the oil pan, cylinder head, cylinder, and pistons all pulled. So I am looking at the crankcase with the con-rods moving freely. Well, almost. The #3 is a bit to sticky for my liking. So I take the rod off (you can get to it through the oil pan opening). I put the bearing halves back in the opening of the con-rod and I see that the bearing has been warped, because is is out of round with the opening of the con-rod. So I want to replace the bearing, of course. The con-rod is marked with a 2 and D. The old bearing thickness is 0.056" and is marked AK16B. I am looking at my Clymer manual and it states that I have to cross reference these markings with markings on the end of the crankshaft. The result should be one of 5 bearing sizes, and 3 of these sizes will work for a #2 rod and they are called: green, brown, or black. "This is great," I said. "I will just measure the old one and order a new one." The measurement of my old bearing is quite a bit less than the thicknesses listed in the book, so I know that it is bad. So let me boil this down to the questions that I have: 1) How do these color designations transfer to the actual parts? There are 5 colors listed in the Clymer, and 6 lettered bearings in the parts fiche (A-F)? Does anyone have the thickness specs of the A-F bearings (maybe from the Honda shop manual)? 2) Is the old bearing small and warped because of excessive wear? What caused this, and how can I prevent it from happening again? (BTW, the crank journal is in very good shape) Should I be looking for a clogged oil passage? 3) How can I establish what size bearing to use without taking the case apart? I am having a hard time getting a caliper / micrometer in the cylinder hole to get a good read, and my best improvised measuring device is no match for the .0001 precision needed here. 4) Are OEM bearings sold in pairs/matching sets, or do you have to buy 2 for each con-rod? I was thinking about maybe trying all 3 sizes rated for a #2 con-rod, and using the one that worked the best. This would not be fun if I have to buy 2 of each size @ $9 each. 5) OR......should I just split the cases and stop belly-aching? Thanks for the advice! ZMAN --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nighthawk_lovers?hl=en -~----------~----~----~----~------~----~------~--~---
