By John Evans, May 4 2021 07:05PM
I had a question asked of me that is very pertinent to the fact of the very real scarcity of OEM crankshaft shells.
Here is the question along with my answer:
I have a question about con rod bearings for the GL1100.
Is it possible to use the con rod bearings from cylinder 2&4, the shells with oil holes, on cylinder 1&3 rod/journals whose shells that don't have them?
Thanks in advance for any info.
There is obviously no problem using them in the rod caps. I have struggled to find out why Honda only specified oil holes in #2 and #4 but have never seen anything official from Honda.
My theory, and it's only a theory, is that due to the direction the crank is turning, sufficient oil is thrown up to the #1 and #3 cylinder walls to not NEED the oil holes, whereas the opposite side does. I seriously doubt if using the shells with holes in the #1 and #3 would cause any problems from the extra oiling other than possibly some oil burning if the rings are worn. The oil pump should be able to cope with the extra needed delivery.
Strangely, the GL1200 has the oil hole in all the rod bearings.
So that gives you two alternatives.
Try to find just two shells without holes just for the rods, or take the slight chance and use the ones with holes.