INSPECTION
INSPECTION - CYLINDER HEAD
Inspect the cylinder head for cracks in the combustion
surface. Pressure test any cylinder head that is visibly
cracked. A cylinder head that is cracked between the
injector bore and valve seat can be pressure tested
and reused if OK; however, if the crack extends into
the valve seat insert bore, the cylinder head must be
replaced.
Visually inspect the cylinder block and head combus-
tion surfaces for localized dips or imperfections. Check
the cylinder head and block combustion surfaces for
overall out-of-flatness. If either the visual or manual
inspection exceeds the limits, then the head or block
must be surfaced.
Check the top surface for damage caused by the cylinder head gasket leaking between cylinders.
Inspect the block and head surface for nicks, erosion, etc.
Check the head distortion. Maximum overall variation end to end is 0.305 mm (0.012 inch), and maximum overall
variation side to side 0.076 mm ( .003 in.).
DO NOT proceed with the in-chassis overhaul if the cylinder head or block surface is damaged or not flat (within
specifications).
Check block surface for distortion. Maximum variation end-to-end is 0.076 mm ( .003 in.), side-to-side 0.051 mm
(.002).
Visually inspect the cylinder head bolts for damaged
threads, corroded/pitted surfaces, or a reduced diam-
eter due to bolt stretching.
If the bolts are not damaged, their “free length” should
be measured using the cap screw stretch gauge pro-
vided with the replacement head gasket. Place the
head of the bolt against the base of the slot and align
the bolt with the straight edge of gauge . If the end of
the bolt touches the foot of the gauge, the bolt must
be discarded. The maximum bolt free length is
132.1 mm (5.200 in.).
9 - 2562
ENGINE - 5.9L DIESEL - SERVICE INFORMATION
DR/DH