Specifications

151
7
INSPECT CYLINDER HEAD
COMPONENTS
Inspect Push Rods (All Models)
Check pushrods for straightness as shown in
Fig. 11.
Fig. 11
Replace if bent.
Inspect Head For Distortion (All
Models)
1. Clean the mating surface of the cylinder
head.
2. Using a straight edge that extends across
both sides of the cylinder head mating
surfaces:
• Check that the straight edge comes in
contact with the entire mating surface
area of the head.
• Move the straight edge to various different
positions on the mating surface.
• If equal contact is made in all positions, the
mating surface is good (Fig. 12).
Fig. 12
3. If an area is questionable, use a feeler
gauge to measure the amount of
distortion as shown in Fig. 13.
Fig. 13
For reject dimensions, see SECTION 14-
ENGINE SPECIFICATIONS.
If the allowable distortion limit is exceeded:
• Replace the cylinder head and/or cylinder
block.
Inspect Valve Guide Inner Diameter
(All Models)
For 28Q700:
1. Measure intake and exhaust valve guides
with Valve Guide Plug Gauge #19381.
• Replace cylinder head if the flat end of the
gauge can enter guide 1/4 in. (6.35 mm)
or more.
If plug gauge is not available:
• Measure valve guides and compare with
listed reject dimensions. See SECTION
14- ENGINE SPECIFICATIONS.