compression ratio FORD SIERRA 1983 1.G CVH Engines Workshop Manual

1.6 litre engine
Note: Unless otherwise stated, the Specifications for the 1.6 litre CVH engine are as given for the 1.8 litre (R2A type) which follow.
General
Engine code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . L6B
Bore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79.960 mm
Stroke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79.520 mm
Cubic capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1596 cc
Compression ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.0 :1
Compression pressure at starter motor speed . . . . . . . . . . . . . . . . . . . . 12.2 to 14.3 bars
Maximum continuous engine speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6000 rpm
Maximum engine power (DIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 kW at 5500 rpm
Maximum engine torque (DIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121 Nm at 3500 rpm
Cylinder bore diameter
Standard class 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79.940 to 79.950 mm
Standard class 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79.950 to 79.960 mm
Standard class 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79.960 to 79.970 mm
Standard class 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79.970 to 79.980 mm
Oversize class A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80.230 to 80.240 mm
Oversize class B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80.240 to 80.250 mm
Oversize class C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80.250 to 80.260 mm
Chapter 2 Part C:
CVH engines
Camshaft and cam followers - removal, inspection and refitting . . . .23
Compression test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Crankcase ventilation system - inspection and maintenance . . . . . . .3
Crankshaft and bearings - examination and renovation . . . . . . . . . .33
Crankshaft and main bearings - removal and refitting . . . . . . . . . . . .32
Crankshaft front oil seal - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Crankshaft rear oil seal - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Cylinder block and bores - examination and renovation . . . . . . . . . .34
Cylinder head - dismantling and reassembly . . . . . . . . . . . . . . . . . . .21
Cylinder head - inspection and renovation . . . . . . . . . . . . . . . . . . . . .22
Cylinder head - removal and refitting (engine in vehicle) . . . . . . . . . .19
Cylinder head - removal and refitting (engine removed) . . . . . . . . . . .20
Engine - refitting (automatic transmission in vehicle) . . . . . . . . . . . . .13
Engine - refitting (manual gearbox in vehicle) . . . . . . . . . . . . . . . . . . .12
Engine - removal leaving automatic transmission in vehicle . . . . . . . .9
Engine - removal leaving manual gearbox in vehicle . . . . . . . . . . . . . .8
Engine/automatic transmission assembly - reconnection and
refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Engine/automatic transmission assembly - removal and separation .11Engine dismantling, examination, renovation and reassembly - general
information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Engine/manual gearbox assembly - reconnection and refitting . . . . .14
Engine/manual gearbox assembly - removal and separation . . . . . .10
Engine mountings - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Engine oil and filter - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Flywheel/driveplate - removal, inspection and refitting . . . . . . . . . . .24
General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Initial start-up after overhaul or major repair . . . . . . . . . . . . . . . . . . .35
Major operations possible with the engine in the vehicle . . . . . . . . . . .5
Major operations requiring engine removal . . . . . . . . . . . . . . . . . . . . .6
Method of engine removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Oil pump - dismantling, inspection and reassembly . . . . . . . . . . . . .29
Oil pump - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Pistons and connecting rods - examination and renovation . . . . . . .31
Pistons and connecting rods - removal and refitting . . . . . . . . . . . . .30
Sump - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Timing belt and sprockets - removal and refitting . . . . . . . . . . . . . . .18
2C•1
Specifications Contents
2C
Easy,suitable for
novice with little
experienceFairly easy,suitable
for beginner with
some experienceFairly difficult,
suitable for competent
DIY mechanic
Difficult,suitable for
experienced DIY
mechanicVery difficult,
suitable for expert
DIY or professional
Degrees of difficulty

Torque wrench settingsNmlbf ft
Main bearing cap bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90 to 10066 to 74
Connecting rod (big-end bearing cap) bolts . . . . . . . . . . . . . . . . . . . . . .30 to 3622 to 27
Crankshaft pulley bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100 to 11574 to 85
Camshaft sprocket bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54 to 5940 to 44
Flywheel bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82 to 9261 to 68
Oil pump bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 to 116 to 8
Oil pump cover bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 to 126 to 9
Sump bolts (in two stages) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 to 84 to 6
Rocker arm nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 to 2918 to 21
Cylinder head bolts:
Stage 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 to 4015 to 30
Stage 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40 to 6030 to 44
Stage 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Angle-tighten a further 90º
Stage 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Angle-tighten a further 90º
Camshaft cover bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 to 84 to 6
Timing cover bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 to 117 to 8
Timing belt tensioner bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 to 2012 to 15
Oil pick-up tube/strainer-to-oil pump bolts . . . . . . . . . . . . . . . . . . . . . .8 to 126 to 9
Oil pick-up tube/strainer-to-cylinder block bolt . . . . . . . . . . . . . . . . . . .17 to 2313 to 17
Camshaft thrustplate bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 to 137 to 10
Crankshaft rear oil seal housing bolts . . . . . . . . . . . . . . . . . . . . . . . . . .8 to 116 to 8
1.8 litre (R2A type) engine
General
Engine type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Four-cylinder, in-line, single overhead camshaft
Firing order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3-4-2
Engine code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .R2A
Bore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80.00 mm
Stroke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88.00 mm
Cubic capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1769 cc
Compression ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9.3:1
Compression pressure at starter motor speed . . . . . . . . . . . . . . . . . . . .11 to 13 bar
Maximum continuous engine speed . . . . . . . . . . . . . . . . . . . . . . . . . . . .5850 rpm
Maximum engine power (DIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66 kW at 5250 rpm
Maximum engine torque (DIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .147 Nm at 3000 rpm
Cylinder bore diameter
Standard class 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79.940 to 79.950 mm
Standard class 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79.950 to 79.960 mm
Standard class 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79.960 to 79.970 mm
Standard class 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79.970 to 79.980 mm
Standard class 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79.980 to 79.990 mm
Standard class 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79.990 to 80.000 mm
Oversize class A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80.000 to 80.010 mm
Oversize class B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80.010 to 80.020 mm
Oversize class C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80.020 to 80.030 mm
Crankshaft
Endfloat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.10 to 0.20 mm (0.004 to 0.008 in)
Main bearing running clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.028 to 0.067 mm
Main bearing journal diameter:
Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53.980 to 54.000 mm
Undersize 0.25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53.730 to 54.750 mm
Undersize 0.50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53.480 to 53.500 mm
Undersize 0.75 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53.230 to 53.250 mm
Centre main thrust bearing shell width:
Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28.825 to 28.875 mm
Undersize 0.15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28.675 to 28.725 mm
Big-end bearing running clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.020 to 0.065 mm
Big-end bearing journal diameter:
Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43.890 to 43.910 mm
Undersize 0.25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43.640 to 43.660 mm
Undersize 0.50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43.390 to 43.410 mm
Undersize 0.75 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43.140 to 43.160 mm
Undersize 1.00 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42.890 to 42.910 mm
CVH engines 2C•3
2C

the tapered lower compression ring with the
“TOP” mark towards the top of the piston and
the gap 150º from the spreader gap, then fit
the upper compression ring with the gap 150º
on the other side of the spreader gap. Note
that the compression rings are coated with a
molybdenum skin which must not be
damaged.
1.6 and 1.8 litre (R6A type)
6Proceed as described in paragraphs 1 to 5
inclusive, but note the following differences
for the 1.6 litre engine.
7Before fitting the new rings to the pistons,
insert them into the relevant cylinder bore and
use a feeler blade to check that the end gaps
are within the limits given in the Specifications
at the beginning of this Chapter. Check the
end gaps with the ring at the top and the
bottom of the cylinder bore.8Fit the oil control ring sections with the
spreader ends abutted opposite the front of
the piston, making sure that the ends do not
overlap. The side ring gaps should be offset
120º either side of the spreader gap. Fit the
tapered lower compression ring with the
“TOP” mark uppermost and the gap 120º
from the spreader gap, then fit the upper
compression ring with the gap 120º on the
other side of the spreader gap. Note that the
compression rings are coated with a
molybdenum disulphide skin, which must not
be damaged.
1.8 litre (R2A type)
Removal
1With the engine removed from the vehicle,
remove the timing belt, crankshaft sprocket
and thrustwasher.
2Remove the pistons and connecting rods. If
no work is to be done on the pistons and
connecting rods, there is no need to push the
pistons out of the cylinder bores.
3Remove the oil pump and pick-up tube.
4Unscrew the four securing bolts and
remove the crankshaft rear oil seal housing.
5Check the main bearing caps for
identification marks and if necessary use a
centre-punch to identify them.
6Before removing the crankshaft, check that
the endfloat is within the specified limits byinserting a feeler blade between the centre
crankshaft web and the thrust bearing shell
(see illustration). This will indicate whether a
new thrust bearing shell is required.
7Unscrew the bolts and tap off the main
bearing caps complete with bearing shells.
8Lift the crankshaft from the crankcase.
9Extract the bearing shells, keeping them
identified for location.
Refitting
10Commence refitting as follows.
11Wipe the bearing shell locations in the
crankcase with a soft, non-fluffy rag.
12Wipe the crankshaft journals with a soft,
non-fluffy rag.
13If the old main bearing shells are to be
renewed (not to do so is a false economy,
unless they are virtually new) fit the five upper
halves of the main bearing shells to their
location in the crankcase. Note the flanged
thrust bearing shell should be fitted to the
centre bearing location (see illustrations).
14Identify each main bearing cap and place
in order. The number is cast on to the cap and
an arrow is also marked which should point
towards the front of the engine.
15Wipe the cap bearing shell location with a
soft non-fluffy rag.
16Fit the bearing half shell onto each main
bearing cap.
17Lubricate the crankshaft journals and the
upper and lower main bearing shells with
clean engine oil.
18Carefully lower the crankshaft into the
crankcase (see illustration).
19Lubricate the crankshaft main bearing
journals again, then fit No 1 bearing cap. Fit
the two securing bolts but do not tighten yet.
20Fit the rear bearing cap, then the centre
bearing cap, but as before do not tighten the
bolts yet.
21Fit the intermediate bearing caps and
securing bolts, noting that the studded bolt
which retains the oil strainer/pick-up tube fits
on the inlet manifold side of No 4 bearing cap.
Again, do not tighten the bolts yet.
22Check that the arrows on the bearing
caps all point towards the front of the engine,
and lightly tighten all the bearing cap bolts,
then finally tighten the bolts in a progressive
manner to the specified torque (see
illustrations).
32Crankshaft and main bearings
- removal and refitting
CVH engines 2C•23
2C
32.13b Centre main thrust bearing shell in
cylinder block - 1.8 litre (R2A)
32.22b Tightening a main bearing cap bolt.
Note studded bolt location (arrowed) on
No 4 bearing cap - 1.8 litre (R2A)32.22a The arrows on the bearing caps
must point towards the front of the engine
- 1.8 litre (R2A)32.18 Lowering the crankshaft into the
crankcase - 1.8 litre (R2A)
32.13a Rear main bearing shell in cylinder
block - 1.8 litre (R2A)
32.6 Checking crankshaft endfloat -
1.8 litre (R2A)