bolt pattern OPEL VECTRA 1988 Service Repair Manual

9Engine and transmission
mountings - renewal
3
Note: New left and right-hand
engine/transmission mounting-to-body bolts
must be used on refitting
1The engine/transmission assembly is
suspended in the engine compartment on
three mountings, two of which are attached to
the transmission, and one to the engine.
Right-hand mounting
2If not already done, apply the handbrake,
then raise the front of the vehicle, and support
securely on axle stands (see “Jacking and
Vehicle Support”)..
3Attach lifting tackle and a hoist to the
engine lifting brackets on the cylinder head,
and support the weight of the engine.
4Working under the vehicle, unbolt the
engine mounting bracket from the cylinder
block, and unbolt the mounting block from the
body, then withdraw the bracket/mounting
assembly (see illustration).
5Unbolt the mounting block from the
bracket.
6Fit the new mounting block to the bracket,
and tighten the securing bolts to the specified
torque.
7Refit the mounting bracket to the cylinder
block, and tighten the securing bolts to the
specified torque.
8Fit new mounting block-to-body bolts, and
tighten them to the specified torque.
9Disconnect the lifting tackle and hoist from
the engine.
10Lower the vehicle to the ground.
Left-hand mounting
11Proceed as described in paragraphs 2
and 3.
12Working under the vehicle, unbolt the
mounting block from the mounting bracket
and the body (see illustration).13Before fitting the new mounting block,
check that the original engine bolts which
secured the mounting block to the body
rotate freely in their threaded bores in the
body. If necessary, re-cut the threaded bores
using an M10 x 1.25 mm tap.
14Fit the new mounting block to the bracket,
and tighten the securing bolts to the specified
torque.
15Fit new mounting block-to-body bolts,
and tighten them to the specified torque.
16Proceed as described in paragraphs 9
and 10.
Rear mounting
17Proceed as described in paragraphs 2
and 3.
18Working under the vehicle, unbolt the
mounting block from the front subframe and
the mounting bracket.
19Fit the new mounting block to the
subframe and mounting bracket, and tighten
the securing bolts to the specified torque.
20Proceed as described in paragraphs 9
and 10.
10Engine dismantling and
reassembly - general
4
General
1Ideally, the engine should be mounted on a
dismantling stand, but if this is not available,
stand the engine on a strong bench, at a
comfortable working height. Failing this, the
engine will have to be stripped down on the
floor.
2Cleanliness is most important, and if theengine is dirty, it should be cleaned with
paraffin in an upright position.
3Avoid working with the engine directly on a
concrete floor, as grit presents a real source
of trouble.
4If the engine oil appears extremely dirty or
contaminated, avoid inverting the engine until
the sump has been removed. This will prevent
any contaminated “sludge” from entering the
oilways.
5As parts are removed, clean them in a
paraffin bath. Do not immerse parts with
internal oilways in paraffin, as it is difficult to
remove, usually requiring a high pressure
hose. Clean oilways with nylon pipe cleaners.
6It is advisable to have containers available
to hold small items, to prevent loss and
confusion when refitting.
7Always obtain complete sets of gaskets
when the engine is being dismantled. Keep
the old gaskets as they can be used as
patterns to make replacements should new
gaskets not be available.
8Where possible, refit nuts, bolts and
washers to their locations after removal of the
relevant components, as this helps protect
the threads, and will also prove helpful during
reassembly.
9Retain unserviceable components, to
compare them with the new components
supplied.
10Many of the engine components are
secured using socket-headed “Torx” or
“Allen” bolts, and tools will be required to
remove and refit such bolts.
11Read through each relevant Section of
this Chapter carefullybeforebeginning work,
to ensure that any special tools that may be
required are available. Many components
(gaskets, oil seals, and certain bolts) must be
renewed on reassembly; where applicable,
obtain the required new components before
starting work.
12Before beginning a complete strip of the
engine, the following ancillary components
can be removed once the engine has been
removed from the vehicle:
2A•12SOHC engine procedures
9.4 Right-hand engine mounting
1 Mounting block-to-body bolts
2 Mounting bracket-to-cylinder block bolts9.12 Left-hand engine/transmission mounting
1 Mounting block-to-body bolts
2 Mounting block-to-mounting bracket bolts
If a tap is not available, cut
two slots into the threads of
one of the old flywheel bolts
and use the bolt to remove
the locking compound from the threads.

supported to one side out of the way, thus
avoiding the need to disconnect the relevant
hoses, pipes and wiring.
5If the cylinder head is to be removed
complete with the manifolds, disconnect all
relevant hoses, pipes and wiring from the inlet
manifold and associated components,
referring to Chapter 4A or 4B. On carburettor
models, disconnect the hot air hose from the
shroud on the exhaust manifold. Loosen the
alternator mountings, with reference to
Chapter 5, then unbolt the upper alternator
mounting from the inlet manifold.
6If the inlet manifold is to be left in the engine
compartment, continue as follows, otherwise
go on to paragraph 15.
7Disconnect the air cleaner trunking from the
air box on the carburettor or throttle body, or
directly from the throttle body (as applicable),
and disconnect the camshaft cover breather
hose that runs to the carburettor or throttle
body (as applicable), (see illustration).
8On C 16 NZ2, 1.8 and 2.0 litre models,
disconnect the smaller coolant hose from the
top of the thermostat housing.
9On 1.6 litre models (except C 16 NZ2),
disconnect the breather hose (which runs
from the camshaft cover to the inlet manifold)
at the camshaft cover.
10On fuel injection models, unbolt the two
wiring harnesses earth leads from the
camshaft housing (see illustration).
11On 1.4 and 1.6 litre models (except C 16
NZ2), disconnect the stub hose that connects
the crankcase breather tube to the rear of thecamshaft housing (see illustration).
12Loosen the alternator mountings, referring
to Chapter 5, then unbolt the upper alternator
mounting from the inlet manifold.
13Make a final check to ensure that all
necessary hoses, pipes and wires have been
disconnected, then unscrew the securing
nuts, noting the location of the engine lifting
bracket, and lift the inlet manifold from the
cylinder head. Ensure that the manifold is
properly supported, taking care not to strain
any of the hoses, pipes and wires, etc., which
are still connected.
14Recover the manifold gasket from the
cylinder head.
15If desired, remove the exhaust manifold,
with reference to Chapter 4C.
16Remove the timing belt and the camshaft
sprocket, as described in Section 11.
17Unscrew the two upper rear timing belt
cover securing bolts from the camshaft
housing.
18Disconnect the HT leads from the spark
plugs and the coil, labelling them if necessary
to aid refitting, and remove the distributor
cap, referring to Chapter 5. Where applicable,
disconnect the distributor wiring plug.
19If not already done, disconnect the stub
hose that connects the crankcase breather
tube to the camshaft housing. If applicable
unscrew the bolt securing the crankcase
breather tube bracket to the end of the
cylinder head (see illustrations).
20Disconnect the coolant hoses from the
thermostat housing.21On carburettor models, disconnect the fuel
hoses from the fuel pump. Be prepared for fuel
spillage, and plug the open ends of the hoses,
to prevent further fuel loss and dirt ingress.
22Make a final check to ensure that all
relevant hoses, pipes and wires, etc., have
been disconnected.
23Working from the outside inwards in a
spiral pattern as shown (see illustration),
loosen all the cylinder head bolts by a quarter
of a turn. Then loosen all the bolts by half a
turn, and finally loosen and remove the bolts.
Recover the washers.
24Lift the camshaft housing from the
cylinder head (see illustration). If necessary,
tap the housing gently with a soft-faced mallet
to free it from the cylinder head, but do not
lever at the mating faces. Note that the
camshaft housing is located on dowels.
25Lift the rocker arms and their thrust pads
from the cylinder head, keeping them in order
so that they can be refitted in their original
positions (see illustrations).
26Lift the hydraulic valve lifters from the
cylinder head, and place them upright in an oil
bath until they are to be refitted (see
illustration). Ensure that the depth of oil is
sufficient to fully cover the valve lifters, and
keep the lifters in order, so that they can be
refitted in their original positions.
27Lift the cylinder head from the cylinder
block (see illustration). If necessary, tap the
cylinder head gently with a soft-faced mallet
to free it from the block, but do not lever at the
mating faces. Note that the cylinder head is
located on dowels.
2A•20SOHC engine procedures
20.7 Disconnecting a camshaft cover
breather hose -
2.0 litre engine20.11 Disconnecting the crankcase
breather tube stub hose -
1.6 litre engine
20.23 Cylinder head bolt loosening
sequence - SOHC engines20.19B Unbolting the crankcase breather
tube bracket from the cylinder head -
2.0 litre model20.19A Disconnecting the crankcase
breather tube stub hose -
2.0 litre engine
20.10 Unbolting the fuel injection wiring
harness earth leads from the camshaft
housing - 2.0 litre engine

28Recover the cylinder head gasket and
discard it.
Refitting
29Clean the cylinder head and block mating
faces, and the camshaft housing and cylinder
head mating faces by careful scraping. Take
care not to damage the cylinder head and
camshaft housing, which are made of light
alloy and are easily scored. Cover the coolant
passages and other openings with masking
tape or rag to prevent dirt and carbon falling
in. Mop out all the oil from the bolt holes; if oil
is left in the holes, hydraulic pressure could
crack the block when the bolts are refitted.
30If desired, the cylinder head can be
dismantled and inspected as described in
Sections 22 and 23, and the camshaft
housing can be dismantled as described in
Section 18.31Begin refitting by locating a new gasket
on the block so that the word “OBEN” or
“TOP” can be read from above (see
illustrations).
32With the mating faces scrupulously clean,
locate the cylinder head on the block so that
the positioning dowels engage in their holes.
33Refit the hydraulic valve lifters, thrust
pads and rocker arms to the cylinder head in
their original positions. Liberally oil the valve
lifter bores, and if new lifters are being fitted
initially immerse each one in a container of
clean engine oil and compress it (by hand)
several times to charge it. Lubricate the
contact faces of the valve lifters, thrust pads
and rocker arms with a little molybdenum
disulphide grease (see illustration).
34Temporarily refit the crankshaft sprocket,
and ensure that the timing marks are still
positioned as they were before the timing belt
was removed (see Section 11).35Apply sealing compound (Vauxhall part
No 90094714, or equivalent) to the cylinder
head top mating face (see illustration), then
refit the camshaft housing to the cylinder
head.
36Fit the new cylinder head bolts, ensuring
that the washers are in place under their
heads, and screw the bolts in by hand as far
as possible (see illustration).
37Tighten the bolts working from the inside
outwards in a spiral pattern as shown (see
illustration). Tighten the bolts in the four
stages given in the Specifications -i.e. tighten
all bolts to the Stage 1 torque, then tighten all
bolts to Stage 2 and so on (see illustrations).
38Further refitting is a reversal of the
removal procedure, remembering the
following points.
39Ensure that the HT leads are refitted to
their correct cylinders.
SOHC engine procedures 2A•21
20.25B . . . and their thrust pads from the
cylinder head - 1.6 litre engine
20.35 Apply sealing compound to the
cylinder head top mating face20.33 Lubricate the valve lifter contact
faces with molybdenum disulphide grease20.31B Cylinder head gasket correctly
located over dowel in cylinder block
20.31A Cylinder head gasket “Oben/TOP”
markings20.27 Lifting the cylinder head from the
cylinder block - 1.6 litre engine20.26 Lift the hydraulic valve lifters from
the cylinder head - 1.6 litre engine
20.25A Lift the rocker arms . . .20.24 Lifting the camshaft housing from
the cylinder head - 1.6 litre engine
2A