I have a question on measuring the mains on a block I have. So far the bearings I have to use are all pink/red. With the caps torqued to 56 ft. lbs. with the bearing in them, here are my different clearances.

#1 PINK .0015
#2 PINK .0015
#3 RED .0018
#4 RED .0009
#5 RED .0003

My crank measures pretty consistent, with 1,2,4,5 all coming out to 2.1648-9. And #3 measuring to 2.1645......all within spec.



I am using a mic (.0001) on the crank and keep the measurement locked to set up the .0001 dial bore gauge. I am measuring only vertically, as the bearings can tend to open a little more near the tangs/opposite side.


Clearances on #4 and #5 are not good. I have plastigauged #5 and the crush shows the clearance being in between .001 and .0015, which is acceptable. But I do not like that it didn't measure that way with a mic/bore gauge. The crank bore for #5 is 2.3210 while #1 is 2.3225.

I don't know whether to send it for machine work, or find bearings to fit (obviously I couldn't use a honda bearing). The block has been line bored and not assembled since then. My initial problem was that the crank took 20+ ft lbs to even move when torqued down.

Anyone with any experience/advice?

 

Trying to figure out your math here...

#5

2.3210 - 2.1648 = 0.1562
0.1562 - (2 x .0783) = -.0004

Negative? How sure are you that you're measurements on the crank bore are right?

http://www.laskeyracing.com/shop/bearingthickness.htm - bearing thicknesses I'm using

 

That is strange....never ran the numbers by subtraction. But I just remeasured and yes the empty bore is 2.3210 and the crank is 2.1648. I couldn't tell you how, but that is what I have gotten out of it.

I am 100% on the crank journal and bore.

For the crank:
On a 2-3" mic the line is past the 1 (.100), past the second tick of the 1(.050), in between the 14-15 (.014x), and the lines match up at the 8 (.0008).

And the bore I used a mitutoyo dial bore gauge in the crank bore and zeroed it out. Then used a mic to measure the distance when at zero. Both the micrometer and the dial gauge have .0001 graduations.