Honda Acura NSX 1991 Service Manual page 143

Cylinder Block
Inspection
1 .
Measure wear and taper in directions X and Y at
three levels in each cylinder as shown.
Cylinder Bore Size
Standard (New): 90.69-90.02
(3.543-3.544 in1
Service Limit: 90.07 mm (3.546 in)
Oversize
0.25: 90.25-90.27 mm (3.553-3.554 in)
0.50: 90.50-90.52 mm (3.563-3.564 in)
Bore Taper
Limit: (Difference between first and third measure-
ment) 0.05 mm (0.002 in)
l If measurements in any cylinder are beyond
Oversize Bore Service Limit, replace the block.
Clearance Inspection (page 7-l 2) after reboring.
NOTE: Scored or scratched cylinder bores must be
honed.
Reboring Limit: 6.50 mm (0.626 in)
CYLINDER BORE SIZES (A or Bb
NOTE: To maintain proper piston
clearance, match these letters with
the letters on the pistons. The let-
ters on the block read from left to
right, No. 1 through No. 3 cylinders
on the first line and No.4 through
No.6 cylinders on the second line.
mm
2. Check the top of the block for warpage.
Measure along the edges and across the center as
shown.
SURFACES TO BE MEASURED
Engine Blcok Warpage:
Standard (New): 0.07 mm (0.003 in1
Service Limit: 0.10 mm (0.004 in)
PRECISION STRAIGHT EDGE
7-13