Looks like I have my work cut out~ ok, remove the crank, do the chamfer thing, drill the hole and all should be good! I'll post pics as I go, not sure if I'll get to it today, but I do need to order some tiny drill bits;)
Did you see clearly how to do the bearing chamfer? All you have to do is knock that 90 degree corner off the bearing from the outside to the oil groove, so it will squirt oil out along the chamfer and onto the timing chain. You do it to the upper bearing half that's in the engine, on the same side as the bearing lock tang. Nuthin to it.Thank you MV8 and Rusty!
I did the same with my 273 although I drilled into a Welch plug (soft plug) and it was a 1/16". Probably too big but no issues, and that .040 drill would be much better.
When did they start doing it? I just tore down a 66 225 today with original bearings and the front one was not chamfered. 66 date code bearings, too.
I think I would chamfer it just "a bit" more, but you certainly have the idea! You especially want to "open up" the chamfer to the oil groove in the bearing pretty good.Just practicing on an old main bearing to get the idea. I don't see how a file would even cut this material. My dremmel bits are very fine and can work down in grit to eventually polish. Is this acceptable? The bearings which were in the car where not champhered at all and had quite a few miles on them. I don't see how oil ever made it to the timing chain.
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As far as I know, all the OEM bearings had the champhor. From day one on. All the factory service manuals I have read (not all that were published) mentioned about the bearing. The factory parts book, lists the #1 main as a different part number from the # 2 & 4. The aftermarket parts listing, lists the #1,2,and4 as the same part number.
I couldn't see where her chamfer intersected with the bearing groove. But I have a set of original bearings here with no chamfer whatsoever. I have a good magnifying glass, too.
If You're doing the oil hole in the gallery plug on top of the chamfer, You'll be fine, that chamfer doesn't need to be any deeper than to make the notch disappear. If You've got good oil pressure there will be plenty of oil, & the edge of the bearing shells are under a crush load, if the edge is too thin it will deform & lose that, leaving ~1/2 the shell w/o the proper loading.Just practicing on an old main bearing to get the idea. I don't see how a file would even cut this material. My dremmel bits are very fine and can work down in grit to eventually polish. Is this acceptable? The bearings which were in the car where not champhered at all and had quite a few miles on them. I don't see how oil ever made it to the timing chain.
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etc. I'm thinking to just put the minimal champher (not like I did earlier) and the gallery plug and call it a day. I'm just surprised there are no pictures of bearing with the chamfor.
There will be zero "oil spray". "Spray" is indicative of pressure and there's zero pressure on the timing set without the chamfered front main bearing or the drilled main oil passage plug, so the more accurate term to us would be splash oiling and it's danged poor splash at that. I've run engines before with the timing cover off for diagnostic purposes in the past. Although I've never done it on a slant 6, I've done on it Chevy, Ford and Mopar V8 engines. Each time, there was so little oil splash, there was almost no mess to clean up. It would surprise you.
