ratamahata
Well-known member
Thanks for your answer, the truth is that I had not noticed the crankshaft alignment, you're right, it must be so as you described. I checked the cap with some kind of oil color, then rotate the cap carefully on the crankshaft journal, then I looked at the pattern, was quite correct and had a uniform pattern across the cap.Lotsa great pictures!
One potential trouble I see is the replacement bearing cap.
It's my understanding that babbit is pored into a block with all the caps installed and then align bored to a straight line. Subtle differences in casting make no two caps alike, so interchanging isn't normally an option.
You need to install and torque the cap, then use an inside micrometer within the bore to insure it's perfectly round and consistant with full contact to the journal. Equally important is that the main bores are in alignment with each other or the crankshaft may bind up.
You may get lucky and find it runs OK without further checking but that's an expensive gamble. Now is your best chance to make sure the parts are fitted correctly or you may ruin the crankshaft and more.
PS...Oven cleaner is a wonderfull product to remove that heavy sludge. Just keep it off the bearings.
I'll check the crank with this oil color to. First the crankshaft in the block to see the pattern in each main, then will place the bearing caps and put some more colored oil to see the pattern in the caps.
First I will have the engine up to position the crankshaft, then in the right position to turn the crank and see the pattern in the caps.
Last edited: