TM 5-4310-379-14
5-24. Cylinder Block and Front Cover Assembly (Cont).
(7)
After pressure test is completed, remove plates and gaskets and dry block thoroughly.
NOTE
Pressure test without the use of water tank.
(8)
Seal all inlet and outlet openings with steel plates and gaskets. However, before attaching last plate, fill
water jacket with a mixture of water and one gallon of antifreeze.
(9)
Install remaining sealing plate and tighten it securely.
(10)
Apply 40 psi (276 kPa) air pressure to water jacket and maintain pressure at least two hours.
(11)
At end of test period, examine cylinder bores, air box, oil passages, crankcase and exterior of block for
presence of water and antifreeze mixture which indicates presence of cracks. If cracks are found, replace
block.
(12)
After test is completed, remove all plates, and drain water jacket and blow out all the passages in block
with compressed air.
NOTE
Top face of block must not vary over.003 in. (.007 cm) transversely and not over .005 in.
longitudinally.
(13)
Check cylinder block for flatness using an accurate straight edge.
NOTE
Mater ring gage has an l. D. of 4.6270 in. (11.7525 cm) with dial set at zero.
(14)
Using cylinder checking gage, placed in master ring gage, check bore as follows:
(a)
Rotate dial clockwise to .001 in. (.002 cm) to give a zero dial Indicator setting of 4.6260 in. (11.7500 cm).
(b)
Take measurements on surfaces at positions A, B, C, D, E and F in the bores axes 900 apart. Read
measurements from the zero mark on the gage.
NOTE
Standard size block bore is 4.6260-4.6270 in. (11.7500-11.7525 cm). Liner-to-block clearance, with
new liner is .0005-.0025 in. (.0012-.0063 cm), and used parts, the maximum liner-to-block clearance
is .003 in. (.007 cm). The out-of-round must not exceed .003 in. (.007 cm) or taper must not be
more than .002 in. in each bore. Cylinder liners are available in .005, .010, .020, and .030 in. (.012,
.025, .050, and .076 cm) oversize on the outside diameter.
5-102
