SOHCengines 2A•3
2A
Cylinder head
Identification mark:
1.8 (REC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85
2.0 (NEL and NRA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0
Valve seat angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44°30’ to 45°00’
Valve seat width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5 to 2.0 mm
Valve guide bore:
Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8.063 to 8.088 mm
Oversize 0.2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8.263 to 8.288 mm
Oversize 0.4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8.463 to 8.488 mm
Camshaft bearing parent bores:
Front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45.072 to 45.102 mm
Centre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47.692 to 47.722 mm
Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48.072 to 48.102 mm
Auxiliary shaft
Endfloat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.050 to 0.204 mm
Camshaft
Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Toothed belt
Thrust plate thickness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.98 to 4.01 mm
Endfloat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.104 to 0.204 mm
Cam lift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6.3323 mm
Cam length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36.26 to 36.60 mm
Valve timing:
Inlet opens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24°BTDC
Inlet closes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64°ABDC
Exhaust opens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70°BBDC
Exhaust closes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18°ATDC
Bearing journal diameter:
Front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41.987 to 42.013 mm
Centre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44.607 to 44.633 mm
Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44.987 to 45.013 mm
Bearing bush internal diameter:
Front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42.035 to 42.055 mm
Centre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44.655 to 44.675 mm
Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45.035 to 45.055 mm
Valve clearances (cold)
Inlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.20 ±0.03 mm (0.008 ±0.001 in)
Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.25 ±0.03 mm (0.010 ±0.001 in)
Inlet valves
Length:
1.8 (REC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .111.75 to 112.75 mm
2.0 (NEL and NRA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .110.65 to 111.65 mm
Head diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41.80 to 42.20 mm
Stem diameter:
Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8.025 to 8.043 mm
Oversizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+0.2, 0.4, 0.6 and 0.8 mm
Stem-to-guide clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.020 to 0.063 mm
Exhaust valves
Length:
1.8 (REC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .111.15 to 112.15 mm
2.0 (NEL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .110.05 to 111.05 mm
2.0 (NRA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .110.75 to 111.75 mm
Head diameter:
1.8 (REL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34.00 to 34.40 mm
2.0 (NEL and NRA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35.80 to 36.20 mm
Stem diameter:
Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.999 to 8.017 mm
Oversizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+0.2, 0.4, 0.6 and 0.8 mm
Stem-to-guide clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.046 to 0.089 mm
Valve springs
Free length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47.0 mm
Inside diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23.45 to 23.95 mm
Wire diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.87 to 3.93 mm
Number of turns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.7
procarmanuals.com
3Note that undersize bearings may already
have been fitted, either in production or by a
previous repairer. Check the markings on the
backs of the old bearing shells, and if in doubt
take them along when buying new ones(see
illustrations).Production undersizes are also
indicated by paint marks as follows:
White line on main bearing cap - parent bore
0.40 mm oversize
Green line on crankshaft front counterweight
- main bearing journals 0.25 mm undersize
Green spot on counterweight - big-end
bearing journals 0.25 mm undersize
4If the crankshaft endfloat is more than the
maximum specified amount, new
thrustwashers should be fitted to the centre
main bearings. These are usually supplied
together with the main and big-end bearings
on a reground crankshaft.
5An accurate method of determining bearing
wear is by the use of Plastigage. The
crankshaft is located in the main bearings (and
big-end bearings if necessary) and the
Plastigage filament located across the journal
which must be dry. The cap is then fitted and
the bolts/nuts tightened to the specified
torque. On removal of the cap the width of the
filaments is checked against a scale which
shows the bearing running clearance. This
clearance is then compared with that given in
the Specifications (see illustration).
6If the spigot bearing in the rear of the
crankshaft requires renewal extract it with a
suitable puller. Alternatively fill it with heavygrease and use a close fitting metal dowel
driven into the centre of the bearing. Drive the
new bearing into the crankshaft with a soft
metal drift.
1The cylinder bores must be examined for
taper, ovality, scoring and scratches. Start by
examining the top of the bores; if these are
worn, a slight ridge will be found which marks
the top of the piston ring travel. If the wear is
excessive, the engine will have had a high oil
consumption rate accompanied by blue
smoke from the exhaust.
2If available, use an inside dial gauge to
measure the bore diameter just below the
ridge and compare it with the diameter at the
bottom of the bore, which is not subject to
wear. If the difference is more than 0.152 mm
(0.006 in), the cylinders will normally require
reboring with new oversize pistons fitted.
3Proprietary oil control rings can be obtained
for fitting to the existing pistons if it is felt that
the degree of wear does not justify a rebore.
However, any improvement brought about by
such rings may be short-lived.
4If new pistons or piston rings are to be fitted
to old bores, deglaze the bores with abrasive
paper or a “glaze buster” tool. The object is to
produce a light cross-hatch pattern to assist
the new rings to bed in. 5If there is a ridge at the top of the bore and
new piston rings are being fitted, either the top
piston ring must be stepped (“ridge dodger”
pattern) or the ridge must be removed with a
ridge reamer. If the ridge is left, the piston ring
may hit it and break.
6Thoroughly examine the crankcase and
cylinder block for cracks and damage and use
a piece of wire to probe all oilways and
waterways to ensure that they are
unobstructed.
1Examine the pistons for ovality, scoring and
scratches. Check the connecting rods for wear
and damage. The connecting rods carry a
letter indicating their weight class; all the rods
fitted to one engine must be of the same class
(see illustration).
2The gudgeon pins are an interference fit in
the connecting rods, and if new pistons are to
be fitted to the existing connecting rods the
work should be carried out by a Ford garage
who will have the necessary tooling. Note that
the oil splash hole on the connecting rod must
be located on the right-hand side of the piston
(the arrow on the piston crown faces forwards)
(see illustration).
3If new rings are to be fitted to the existing
pistons, expand the old rings over the top of
the pistons. The use of two or three old feeler
blades will be helpful in preventing the rings
dropping into empty grooves. Note that the oil
control ring is in three sections.
4Before fitting the new rings to the pistons,
insert them into the cylinder bore and use a
feeler blade to check that the end gaps are
within the specified limits (see illustrations).
5Clean out the piston ring grooves using a
piece of old piston ring as a scraper. Be
careful not to scratch the aluminium surface of
the pistons. Protect your fingers - piston ring
edges are sharp. Also probe the groove oil
return holes.
6Fit the oil control ring sections with the
spreader ends abutted opposite the front of the
piston. The side ring gaps should be 25 mm
29Pistons and connecting rods
- examination and renovation
28Cylinder block and bores -
examination and renovation
SOHCengines 2A•13
2A
27.3a Undersize crankshaft bearings are
indicated by a spot and/or line on the front
counterweight27.3b Main bearing cap marks (arrowed)
denote oversize parent bore27.5 Checking the width of the Plastigage
filament against the scale on the packet
29.1 Weight class mark (arrowed) on
connecting rod29.2 Relationship of piston crown arrow and
connecting rod oil splash hole (arrowed)
procarmanuals.com
2C•2V6 engines
Oil pump
Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Bi-rotor
Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .From camshaft
Operating clearances:
Outer rotor-to-housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.15 to 0.30 mm
Inner-to-outer rotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.05 to 0.20 mm
Rotor endfloat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.03 to 0.10 mm
Cylinder block
Cast identification mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E
Bore diameter:
Standard grade 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93.010 to 93.020 mm
Standard grade 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93.020 to 93.030 mm
Standard grade 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93.030 to 93.040 mm
Standard grade 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93.040 to 93.050 mm
Oversize grade A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93.520 to 93.530 mm
Oversize grade B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93.530 to 93.540 mm
Oversize grade C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93.540 to 93.550 mm
Standard service grade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93.040 to 93.050 mm
Oversize 0.5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93.540 to 93.550 mm
Oversize 1.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94.040 to 94.050 mm
Main bearing parent bore:
Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60.620 to 60.640 mm
Oversize . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61.000 to 61.020 mm
Camshaft bearing bore (without bushes):
Front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47.025 to 47.060 mm
Front centre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46.645 to 46.680 mm
Rear centre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46.265 to 46.300 mm
Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45.885 to 45.920 mm
Crankshaft
Number of main bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Main bearing journal diameter (standard) . . . . . . . . . . . . . . . . . . . . . . . .56.980 to 57.000 mm
Main bearing running clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.008 to 0.062 mm
No 3 (thrust) bearing shoulder width (standard) . . . . . . . . . . . . . . . . . . .26.390 to 26.440 mm
No 3 (thrust) flanged bearing shell width (standard) . . . . . . . . . . . . . . . .26.240 to 26.290 mm
Crankshaft endfloat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.08 to 0.20 mm
Big-end bearing journal diameter (standard) . . . . . . . . . . . . . . . . . . . . .53.980 to 54.000 mm
Big-end bearing running clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.006 to0.064 mm
Pistons
Diameter:
Standard grade 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92.972 to 92.982 mm
Standard grade 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92.982 to 92.992 mm
Standard grade 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92.992 to 93.002 mm
Standard grade 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93.002 to 93.012 mm
Service standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93.000 to 93.020 mm
Oversize 0.5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93.500 to 93.520 mm)
Oversize 1.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94.000 to 94.020 mm
Clearance in bore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.020 to 0.050 mm
Piston ring end gaps:
Top and centre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.38 to 0.58 mm
Bottom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.40 to 1.40 mm
Gudgeon pins
Diameter:
Red . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23.994 to 23.997 mm
Blue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23.997 to 24.000 mm
Clearance in piston . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.008 to 0.014 mm
Interference in connecting rod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.018 to 0.042 mm
Connecting rods
Big-end parent bore diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56.820 to 56.840 mm
Small-end bush internal diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23.958 to 23.976 mm
Cylinder heads
Cast identification mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .EN
Valve seat angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44°30’ to 45°00’
Valve seat width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.61 to 2.33 mm
Valve guide bore:
Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8.063 to 8.088 mm
Oversizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+0.2, 0.4, 0.6 and 0.8 mm
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REF•14Glossary of Technical Terms
GGapThe distance the spark must travel in
jumping from the centre electrode to the side
electrode in a spark plug. Also refers to the
spacing between the points in a contact
breaker assembly in a conventional points-
type ignition, or to the distance between the
reluctor or rotor and the pickup coil in an
electronic ignition.
GasketAny thin, soft material - usually cork,
cardboard, asbestos or soft metal - installed
between two metal surfaces to ensure a good
seal. For instance, the cylinder head gasket
seals the joint between the block and the
cylinder head.
GaugeAn instrument panel display used to
monitor engine conditions. A gauge with a
movable pointer on a dial or a fixed scale is an
analogue gauge. A gauge with a numerical
readout is called a digital gauge.
HHalfshaftA rotating shaft that transmits
power from the final drive unit to a drive
wheel, usually when referring to a live rear
axle.
Harmonic balancerA device designed to
reduce torsion or twisting vibration in the
crankshaft. May be incorporated in the
crankshaft pulley. Also known as a vibration
damper.
HoneAn abrasive tool for correcting small
irregularities or differences in diameter in an
engine cylinder, brake cylinder, etc.
Hydraulic tappetA tappet that utilises
hydraulic pressure from the engine’s
lubrication system to maintain zero clearance
(constant contact with both camshaft and
valve stem). Automatically adjusts to variation
in valve stem length. Hydraulic tappets also
reduce valve noise.
IIgnition timingThe moment at which the
spark plug fires, usually expressed in the
number of crankshaft degrees before the
piston reaches the top of its stroke.
Inlet manifoldA tube or housing with
passages through which flows the air-fuel
mixture (carburettor vehicles and vehicles with
throttle body injection) or air only (port fuel-
injected vehicles) to the port openings in the
cylinder head.
JJump startStarting the engine of a vehicle
with a discharged or weak battery by
attaching jump leads from the weak battery to
a charged or helper battery.
LLoad Sensing Proportioning Valve (LSPV)A
brake hydraulic system control valve that
works like a proportioning valve, but also
takes into consideration the amount of weight
carried by the rear axle.
LocknutA nut used to lock an adjustment
nut, or other threaded component, in place.
For example, a locknut is employed to keep
the adjusting nut on the rocker arm in
position.
LockwasherA form of washer designed to
prevent an attaching nut from working loose.
MMacPherson strutA type of front
suspension system devised by Earle
MacPherson at Ford of England. In its original
form, a simple lateral link with the anti-roll bar
creates the lower control arm. A long strut - an
integral coil spring and shock absorber - is
mounted between the body and the steering
knuckle. Many modern so-called MacPherson
strut systems use a conventional lower A-arm
and don’t rely on the anti-roll bar for location.
MultimeterAn electrical test instrument with
the capability to measure voltage, current and
resistance.
NNOxOxides of Nitrogen. A common toxic
pollutant emitted by petrol and diesel engines
at higher temperatures.
OOhmThe unit of electrical resistance. One
volt applied to a resistance of one ohm will
produce a current of one amp.
OhmmeterAn instrument for measuring
electrical resistance.
O-ringA type of sealing ring made of a
special rubber-like material; in use, the O-ring
is compressed into a groove to provide the
sealing action.
Overhead cam (ohc) engineAn engine with
the camshaft(s) located on top of the cylinder
head(s).Overhead valve (ohv) engineAn engine with
the valves located in the cylinder head, but
with the camshaft located in the engine block.
Oxygen sensorA device installed in the
engine exhaust manifold, which senses the
oxygen content in the exhaust and converts
this information into an electric current. Also
called a Lambda sensor.
PPhillips screwA type of screw head having a
cross instead of a slot for a corresponding
type of screwdriver.
PlastigageA thin strip of plastic thread,
available in different sizes, used for measuring
clearances. For example, a strip of Plastigage
is laid across a bearing journal. The parts are
assembled and dismantled; the width of the
crushed strip indicates the clearance between
journal and bearing.
Propeller shaftThe long hollow tube with
universal joints at both ends that carries
power from the transmission to the differential
on front-engined rear wheel drive vehicles.
Proportioning valveA hydraulic control
valve which limits the amount of pressure to
the rear brakes during panic stops to prevent
wheel lock-up.
RRack-and-pinion steeringA steering system
with a pinion gear on the end of the steering
shaft that mates with a rack (think of a geared
wheel opened up and laid flat). When the
steering wheel is turned, the pinion turns,
moving the rack to the left or right. This
movement is transmitted through the track
rods to the steering arms at the wheels.
RadiatorA liquid-to-air heat transfer device
designed to reduce the temperature of the
coolant in an internal combustion engine
cooling system.
RefrigerantAny substance used as a heat
transfer agent in an air-conditioning system.
R-12 has been the principle refrigerant for
many years; recently, however, manufacturers
have begun using R-134a, a non-CFC
substance that is considered less harmful to
the ozone in the upper atmosphere.
Rocker armA lever arm that rocks on a shaft
or pivots on a stud. In an overhead valve
engine, the rocker arm converts the upward
movement of the pushrod into a downward
movement to open a valve.
Adjusting spark plug gap
Plastigage
Gasket
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