Can anyone explain why the H22A4 has different specs for the 3, 4, & 5 main journals, as shown in the specs below from the shop manual?



Thanks,
Dave

 

any ideas?

 

Does anyone know why these journal diameters are different?

 

The main bearing-to-journal oil clearance is also different:
#1-#2 = .0008-.0018
#3 = .0010 - .0019
#4 = .0005 - .0015
#5 = .0004 - .0013

I'm open to speculation at this point.

Thanks,
Dave

 

well seems like there favoring the MCP side...could these slight tolerances be in count to balancing of the motor>?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drumking15 &raquo;</TD></TR><TR><TD CLASS="quote">well seems like there favoring the MCP side...could these slight tolerances be in count to balancing of the motor&gt;?</TD></TR></TABLE>

It could be a balance and/or a resonance issue. If you look at the B series specs, they are different also, but only for the center (#3) journal.

The B18 journal specs are:
#1, 2, 4 5: 2.1644 - 2.1654
#3 (B18B): 2.1642 - 2.1651
#3 (B18C): 2.1643 - 2.1653

The oil clearances are the same for B18B and B18C:
#1, 2, 4 5: 0.0009 - 0.0017
#3: 0.0012 - 0.0019

Dave

 

hmmm maybe something to do w/ the girdle also...very intresting...