New Holland CX720 Repair Manual page 1794

Cylinder head - Overhaul (B.10.A.72 - F.10.A.40)
CX720, CX740, CX760, CX780, CX820, CX840
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 ENGINE - General specification (B.10.A -
D.40.A.10), 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.
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.
2. Inspect cylinder head for nicks and burrs on mating
face, Remove using a suitable abrasive and ensure
faces are clean after repair.
Using a straight edge and feeler gauges, check that
the flatness of the cylinder head in all directions does
not exceed, 0.03 mm (0.001 in) in any (25.4 mm (1
in), or 0.127 mm (0.005 in), overall limit.
If the cylinder head has been resurfaced, determine
that all head bolt faces will seat by placing the cylin-
der head less gasket, on the cylinder block and in-
stalling bolts hand tight.
3. Ensure rocker shaft supports are fitted with long
bolts. Using a feeler gauge, check clearance be-
tween underside of bolt heads and cylinder head or
rocker shaft support.
If a 0.25 mm (0.010 in) 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.
POWER PRODUCTION - ENGINE
2 4/7/2006
B.10.A / 248
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TA6010008
2
TA6010012
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