depth with dial indicator depth
gauge. Always measure counterbore
depth on ledge at the edge of liner
3. Check depth at four equidistant locations.
Ledge must not be "cupped" more than 0.
0014 inch (0. 036 mm). Depth must not
vary more than 0. 001 inch (0. 03 mm)
throughout counterbore circumference.
4. Counterbore must always be resurfaced if
it slants downward toward the center or if
dimensions do not meet standards.
5. Subtract counterbore depth from liner
flange thickness to determine amount of
shims and depth of counterbore cut that
must be used to provide 0.004 to 0.006
inch (0.10 to 0.15 mm) liner protrusion;
0.007 inch (0.18 mm) shims are thinnest
(d) The most accurate method of checking
protrusion is as follows:
1. Install liner in block with proper number of
liner shims beneath the flange. Shims
are available from 0.007 to 0.068 inch
(0.18 to 1.73 mm). Use cylinder liner
hold-down tool. Tool should be spaced
so even load is applied.
2. Use gauge block and check liner
protrusion above the cylinder block at
four equidistant points outside the bead.
Add or remove shims beneath the liner
flange as needed to reach 0.004 to 0.006
inch (0.10 to 0.15 mm) protrusion.
3. With lines installed, check for out-of-
(2) Cylinder Liner Lower Bore.
(a) Install a new cylinder liner in the block without
packing rings or crevice seal.
(b) Desirable clearance between liner and block
should be as listed, but liner contact with block
is permissible as long as it does not cause liner
(c) If clearances do not fall within limits, recheck
after counterboring; limits do not apply with
cylinder head installed and tightened to
operating torque. If clearance is not correct,
check lower block packing ring bore inside
(d) Lower liner bore concentricity should be
checked with concentricity gauge. If a piston
seizure has occurred or after counterboring the
cylinder block, check the counterbore to lower
cylinder liner bore concentricity. Liner bore
should be concentric within 0. 005 inch (0. 13
mm) total indicator reading.
(3) Main Bearing Bore.
(a) Assemble main bearing caps to block in