seats FORD SIERRA 1989 2.G CVH Engines Workshop Manual

4Repeat the procedure given in paragraphs
2 and 3 for the remaining valves, keeping all
components identified for location so that
they can be refitted in their original positions.
Note that the inlet valve springs are fitted with
metal dampers. The damper is an integral part
of the spring and cannot be removed (see
illustration).
Reassembly
5Commence reassembly by lubricating the
valve stems and guides with SAE 80/90
hypoid oil, then insert the valves into their
original guides.
6Refit the spring seats over the valve stems.
7Wrap a thin layer of adhesive tape over the
collet grooves of each valve, then smear the
new oil seals with a little hypoid oil and slide
them down the valve stems onto the spring
seats. Use a suitable metal tube to seat the
seals, then remove the adhesive tape from the
valves (see illustration).
8Working on each valve in turn, fit the valve
spring and cap, then compress the spring
using the valve spring compressor and fit the
split collets to the groove in the valve stem.
Release the compressor and tap the end of
the valve stem with a soft-faced mallet to
settle the components. If the original
components are being refitted, ensure that
they are refitted in their original locations.
9Refit the camshaft.
1.6 and 1.8 litre (R6A type)
10Proceed as described in paragraphs 1 to 9
inclusive, but note that no dampers are fitted
to the inlet valve springs on the 1.6 litre engine.Refer to Section 23, Chapter 2, Part A but
pay particular attention to the note at the
beginning of the Section as all CVH engines
are fitted with hardened valve seats.
Note: A new camshaft oil seal and new rocker
arm securing nuts should be used when
refitting.
1.8 litre (R2A type)
Removal
1Remove the cylinder head.
2Unscrew the securing bolts and remove the
rocker arm guides, rocker arms, and cam
follower guide retainers, then lift out the cam
follower guides and the cam followers. Keep
all components in the correct order so that
each component can be refitted in the original
position if it is to be re-used. It is advisable to
store the cam followers upright in an oil bath
until they are to be refitted. Ensure that the
depth of oil is sufficient to fully cover the cam
followers.
3Prise out the camshaft oil seal, taking care
not to damage the surface of the camshaft. If
necessary use self-tapping screws and a
suitable pair of grips to withdraw the seal.4Unscrew the two securing bolts and
withdraw the camshaft thrustplate from the
front of the cylinder head.
5Carefully withdraw the camshaft from the
front of the cylinder head, taking care not to
damage the bearings. If necessary, loosely
refit the camshaft sprocket and bolt to aid
removal.
Inspection
6Examine the surfaces of the camshaft
journals and lobes, and the cam follower rollers
for wear. If wear is excessive, considerable
noise would have been noticed from the top of
the engine when running, and a new camshaft
and followers must be fitted. It is unlikely that
this level of wear will occur unless a
considerable mileage has been covered. Note
that the cam followers cannot be dismantled
for renewal of individual components.
7Check the camshaft bearings in the cylinder
head for wear. If excessive wear is evident, it
may be possible to have the head machined by
a suitably equipped engineering workshop to
enable a camshaft with oversize bearing
journals to be fitted. The only other course of
action available is renewal of the cylinder head.
8Check the cam follower bores in the
cylinder head for wear. If excessive wear is
evident, the cylinder head must be renewed.
9Check the cam follower oil ports and the oil
holes in the cylinder head for obstructions
(see illustrations).
Refitting
10Commence refitting by lubricating the
camshaft, bearings and thrustplate with
23Camshaft and cam followers
- removal, inspection and
refitting
22Cylinder head - inspection and
renovation
2C•16CVH engines
21.3a Remove the spring seat . . .21.4 Inlet valve components. Spring
damper arrowed - 1.8 litre (R2A)
23.9b Cam follower supply hole (arrowed)
in cylinder head - 1.8 litre (R2A)23.9a Hydraulic cam follower oil port
(arrowed) - 1.8 litre (R2A)21.7 Seat each new valve seal using a
metal tube - 1.8 litre (R2A)
21.3b . . . and valve - 1.8 litre (R2A)