SECTION 10 – ENGINE – CHAPTER 1
10-32
Inspection and Repair, Cylinder Head
1. Replace cylinder head core plugs if discoloured
(rusty), or leaking. Before fitting new plugs
remove all old sealer from the cylinder head.
Apply sealant G, see ‘‘SPECIFICATIONS”, to
the new plug mating faces, and drive the new
plugs into location.
The core plugs fitted to the Cylinder Head are:–
6 off, In the top, and 1 off, in the rear of the
cylinder head.
5 off, in the intake face.
2. Scrape all gasket surfaces clean, wash cylinder
head in a suitable solvent and clean valve guide
bores.
NOTE: Ensure injector washers have been removed
prior to cleaning.
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3. Inspect cylinder head for nicks and burrs on
mating face, Remove using a suitable abrasive
and ensure faces are clean after repair.
4. Using a straight edge and feeler gauges, check
that the flatness of the cylinder head in all
directions does not exceed,
0.001 in (0.03mm) in any 1 in (25.4mm), or
0.005 in (0.127mm), overall limit.
5. If the cylinder head has been resurfaced,
determine that all head bolt faces will seat by
placing the cylinder head less gasket, on the
cylinder block and installing bolts hand tight.
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3
4
5
6
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7
8
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6. Ensure rocker shaft supports are fitted with long
bolts. Using a feeler gauge, check clearance
between underside of bolt heads and cylinder
head or rocker shaft support.
7. If a 0.010 in (0.25mm) feeler gauge can be
inserted under the bolt head the bolt has
bottomed. Therefore the cylinder block thread
must be increased using a 9/16–13 UNC–2A
Thread tap. Identify each head bolt to ensure
they are reinstalled in the bolt holes they were
checked in.
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