Acura NSX 1991 Manual page 136

Main Menu
Cylinder Block
Inspection
1. Measure wear and taper in directions X and Y at
three levels in each cylinder as shown.
CYLINDER
BORE
GAUGE
Cylinder Bore Size
Standard (New):
A or I 90.010-90.020 mm (3.5437-3.5441 in)
B or 90.000-90.010 mm (3.5433-3.5437 in)
Service Limit: 90.07 mm (3.546 in)
Oversize
0.25: 90.25-90.26 mm (3.553-3.554 in)
0.50: 90.50-90.51 mm (3.563-3.564 in)
Bore Taper
Limit: (Difference between first and third measure-
ment) 0.05 mm (0.002 in)
• If measurements in any cylinder are beyond
Oversize Bore Service Limit, replace the block.
• If block is to be rebored, refer to Piston Clearance
Inspection (see page 7-13) after reboring.
NOTE: Scored or scratched cylinder bores must be
honed.
Reboring Limit: 0.50 mm (0.020 in)
Table of Contents
CYLINDER BORE SIZES (A or B)
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.
2. Check the top of the block for warpage.
Measure along the edges and across the center as
shown.
SURFACES TO BE MEASURED
Engine Block Warpage:
Standard (New): 0.07 mm (0.003 in) max.
Service Limit: 0.10 mm (0.004 in)
PRECISION STRAIGHT EDGE