Valve clearance SUZUKI SWIFT 2000 1.G SF310 Service Owner's Manual

ENGINE MECHANICAL (G13B, 1-CAM 16-VALVES ENGINE) 6A1-45
INSPECTION
Valve Guides
Using a micrometer and bore gauge, take diameter readings on
valve stems and guides to check stem-to-guide clearance.
Be sure to take reading at more than one place along the length of
each stem and guide.
If clearance exceeds limit, replace valve and valve guide.
Item
StandardLimit
Valve stemIn5.465 – 5.480 mm
(0.2152 – 0.2157 in.)–
diameterEx5.440 – 5.455 mm
(0.2142 – 0.2148 in.)–
Valve guideIn5.500 – 5.512 mmg
I.D.Ex(0.2166 – 0.2170 in.)–
Stem-to-guideIn0.020 – 0.047 mm
(0.0008 – 0.0018 in.)0.07 mm
(0.0027 in.)
g
clearanceEx0.045 – 0.072 mm
(0.0018 – 0.0028 in.)0.09 mm
(0.0035 in.)
If bore gauge is not available, check end deflection of valve stem
with a dial gauge instead.
Move stem end in directions (1) and (2) to measure end deflection.
If deflection exceeds its limit, replace valve stem and valve guide.
Valve stem end
In0.14 mm (0.005 in.)
deflection limitEx0.18 mm (0.007 in.)
Valves

Remove all carbon from valves.

Inspect each valve for wear, burn or distortion at its face and stem
and, as necessary, replace it.

Measure thickness “a” of valve head. If measured thickness ex-
ceeds limit, replace valve.
Valve head thickness
StandardLimit
In0.8 – 1.2 mm0.6 mm (0.024 in.)
Ex(0.03 – 0.047 in.)0.7 mm (0.027 in.)

ENGINE MECHANICAL (G13B, 1-CAM 16-VALVES ENGINE) 6A1-49
Valve Springs

Referring to data given below, check to be sure that each spring
is in sound condition, free of any evidence of breakage or weak-
ening. Remember, weakened valve springs can cause chatter,
not to mention possibility of reducing power output due to gas
leakage caused by decreased seating pressure.
Item
StandardLimit
Valve spring
free length36.83 mm
(1.4500 in.)35.67 mm
(1.4043 in.)
Valve spring
preload10.7 – 12.5 kg for
31.5 mm (23.6 –
27.5 lb / 1.24 in.)9.3 kg for 31.5 mm
(20.5 lb / 1.24 in.)

Spring squareness:
Use a square and surface plate to check each spring for square-
ness in terms of clearance between end of valve spring and
square. Valve springs found to exhibit a larger clearance than limit
given below must be replaced.
Valve spring squareness limit: 1.6 mm (0.063 in.)

“a”: 23 mm (0.91 in.)
ENGINE MECHANICAL (G13B, 1-CAM 16-VALVES ENGINE) 6A1-57

Piston clearance:
Measure cylinder bore diameter and piston diameter to find their
difference which is piston clearance. Piston clearance should be
within specification as given below. If it is out of specification, re-
bore cylinder and use oversize piston.
Piston clearance: 0.02 – 0.04 mm (0.0008 – 0.0015 in.)
NOTE:
Cylinder bore diameters used here are measured in thrust
direction at two positions.

Ring groove clearance:
Before checking, piston grooves must be clean, dry and free of
carbon.
Fit new piston ring (1) into piston groove, and measure clearance
between ring and ring land by using thickness gauge (2).
If clearance is out of specification, replace piston.
Ring groove clearance:
Top: 0.03 – 0.07 mm (0.0012 – 0.0027 in.)
2nd: 0.02 – 0.06 mm (0.0008 – 0.0023 in.)
Piston Pin

Check piston pin, connecting rod small end bore and piston bore
for wear or damage, paying particular attention to condition of
small end bore bush. If pin, connecting rod small end bore or pis-
ton bore is badly worn or damaged, replace pin, connecting rod
or piston.

Piston pin clearance:
Check piston pin clearance in small end. Replace connecting rod
if its small end is badly worn or damaged or if measured clearance
exceeds limit.
Item
StandardLimit
Piston clearance in
small end0.003 – 0.016 mm
(0.0001 – 0.0006 in.)0.05 mm
(0.0020 in.)
Small-end bore:
19.003 – 19.011 mm (0.7482 – 0.7486 in.)
Piston pin dia.:
18.995 – 19.000 mm (0.7478 – 0.7480 in.)

1. Cylinder block
“a”: 120 mm (4.72 in.)
6A1-58 ENGINE MECHANICAL (G13B, 1-CAM 16-VALVES ENGINE)
Piston Rings
To measure end gap, insert piston ring (3) into cylinder bore and
then measure the gap by using thickness gauge (2).
If measured gap is out of specification, replace ring.
NOTE:
Decarbon and clean top of cylinder bore before inserting pis-
ton ring.
Item
StandardLimit
Piston
Top ring0.15 – 0.30 mm
(0.0059 – 0.0118 in.)0.7 mm
(0.0275 in.)
Piston
ring end
gap
2nd ring0.2 – 0.35 mm
(0.0079 – 0.0137 in.)0.7 mm
(0.0275 in.)
ga
Oil ring0.2 – 0.7 mm
(0.0079 – 0.0275 in.)1.7 mm
(0.0669 in.)
Connecting Rod

Big-end side clearance:
Check big-end of connecting rod for side clearance, with rod fitted
and connected to its crank pin in the normal manner. If measured
clearance is found to exceed its limit, replace connecting rod.
Item
StandardLimit
Big-end side
clearance0.10 – 0.20 mm
(0.0039 – 0.0078 in.)0.35 mm
(0.0137 in.)

Connecting rod alignment:
Mount connecting rod on aligner to check it for bow and twist and,
if limit is exceeded, replace it.
Limit on bow: 0.05 mm (0.0020 in.)
Limit on twist: 0.10 mm (0.0039 in.)

ENGINE MECHANICAL (G13B, 1-CAM 16-VALVES ENGINE) 6A1-59
Crank Pin and Connecting Rod Bearings

Inspect crank pin for uneven wear or damage. Measure crank pin
for out-of-round or taper with a micrometer. If crank pin is dam-
aged, or out-of-round or taper is out of limit, replace crankshaft or
regrind crank pin to undersize and use undersize bearing.
Connecting rod bearing size
Crank pin diameter
Standard41.982 – 42.000 mm
(1.6528 – 1.6535 in.)
0.25 mm (0.0098 in.)41.732 – 41.750 mm
(1.6430 – 1.6437 in.)
Out-of-round and taper limit: 0.01 mm (0.0004 in.)

Rod bearing:
Inspect bearing shells for signs of fusion, pitting, burn or flaking
and observe contact pattern. Bearing shells found in defective
condition must be replaced.
Two kinds of rod bearing are available; standard size bearing and
0.25 mm undersize bearing. To distinguish them, 0. 25 mm under-
size bearing has the stamped number (US025) on its backside as
indicated in figure, but standard size one has no number.

Rod bearing clearance:
1) Before checking bearing clearance, clean bearing and crank
pin.
2) Install bearing in connecting rod and bearing cap.
3) Place a piece of gaging plastic (1) to full width of crankpin as
contacted by bearing (parallel to crankshaft), avoiding oil hole.
4) Install rod bearing cap (1) to connecting rod.
When installing cap, be sure to point arrow mark (2) on cap to
crankshaft pulley side (3), as shown in figure. After applying
engine oil to rod bolts, tighten cap nuts to specified torque. DO
NOT turn crankshaft with gaging plastic installed.
Tightening Torque
(a): 35 N
.m (3.5 kg-m, 25.5 lb-ft)

1 or 2
Piston
No.1 Cylinder
No.2 Cylinder
No.3 Cylinder
No.4 Cylinder
Crank
pulley
side
Flywheel
side
6A1-60 ENGINE MECHANICAL (G13B, 1-CAM 16-VALVES ENGINE)
5) Remove cap and using a scale (2) on gaging plastic (1) enve-
lope, measure gaging plastic width at the widest point (clear-
ance).
If clearance exceeds its limit, use a new standard size bearing
and remeasure clearance.
Item
StandardLimit
Bearing
clearance0.020 – 0.050 mm
(0.0008 – 0.0019 in.)0.080 mm
(0.0031 in.)
6) If clearance can not be brought to within its limit even by using
a new standard size bearing, regrind crankpin to undersize
and use 0.25 mm undersize bearing.
ASSEMBLY
NOTE:
Two sizes of piston are available as standard size spare part
so as to ensure proper piston-to-cylinder clearance. When
installing a standard size piston, make sure to match piston
with cylinder as follows.
a) Each piston has stamped number 1 or 2 as shown. It represents
outer diameter of piston.
b) There are also stamped numbers of 1 and 2 on the cylinder block
as shown. The first number represents inner diameter of No.1
cylinder, the second number of No.2 cylinder, the third number
of No.3 cylinder and the fourth number of No.4 cylinder.

2. Arrow mark
4. Oil hole
The oil hole should
come on intake side
1. Arrow mark
2. 1st ring end
gap
3. 2nd ring end
gap and oil ring
spacer gap
4. Oil ring upper
rail gap
5. Oil ring lower
rail gap
6. Intake side
7. Exhaust side Crankshaft
pulley side
Circlip
or
ENGINE MECHANICAL (G13B, 1-CAM 16-VALVES ENGINE) 6A1-61
c) Stamped number on piston and that on cylinder block should
correspond. That is, install number 2 stamped piston to cylinder
which is identified with number 2 and a number 1 piston to cylin-
der with number 1.
PistonCylinder
Number
at the
top
(mark)
Outer diameterNumber
(mark)Bore diameter
Piston-to-cylinder
clearance
1
73.98 – 73.99 mm
(2.9126 –
2.9130 in.)
1
74.01 – 74.02 mm
(2.9138 –
2.9141 in.)0.02 – 0.04 mm
(0.0008 –
0.0015 in.)
2
73.97 – 73.98 mm
(2.9122 –
2.9126 in.)
2
74.00 – 74.01 mm
(2.9134 –
2.9138 in.)0.02 – 0.04 mm
(0.0008 –
0.0015 in.)
Also, a letter A, B or C is stamped on piston head but ordinarily
it is not necessary to discriminate each piston by this letter.
1) Install piston pin to piston (1) and connecting rod (3):
After applying engine oil to piston pin and piston pin holes in pis-
ton and connecting rod, fit connecting rod to piston as shown in
figure and insert piston pin to piston and connecting rod, and
install piston pin circlips.
NOTE:
Circlip should be installed with its cut part facing either up
or down as shown in figure.
2) Install piston rings to piston:

As indicated in figure, 1st and 2nd rings have “RN” or “R” mark
respectively. When installing these piston rings to piston, di-
rect marked side of each ring toward top of piston.

1st ring (1) difffers from 2nd ring (2) in thickness, shape and
color of surface contacting cylinder wall.
Distinguish 1st ring from 2nd ring by referring to figure.

When installing oil ring (3), install spacer first and then two
rails.
3) After installing three rings (1st, 2nd and oil rings), distribute their
end gaps as shown in figure.

1. Gaging plastic
ENGINE MECHANICAL (G13B, 1-CAM 16-VALVES ENGINE) 6A1-71
Main Bearings
General information

Service main bearings are available in standard size and 0.25
mm (0.0098 in.) undersize, and each of them has 5 kinds of bear-
ings differing in tolerance.

Upper half of bearing (2) has oil groove (3) as shown in figure.
Install this half with oil groove to cylinder block (1).

On each main bearing cap, arrow mark and number are em-
bossed as shown in figure.
When installing each bearing cap to cylinder block, point arrow
mark toward crankshaft pulley side and install each cap from that
side to flywheel side in ascending order of numbers “1”, “2”, “3”,
“4” and “5”. Tighten cap bolts to specified torque.
Inspection
Check bearings for pitting, scratches, wear or damage.
If any malcondition is found, replace both upper and lower halves.
Never replace one half without replacing the other half.
Main bearing clearance
Check clearance by using gaging plastic (1) according to the follow-
ing procedure.
1) Remove bearing caps.
2) Clean bearings and main journals.
3) Place a piece of gaging plastic to full width of bearing (parallel
to crankshaft) on journal, avoiding oil hole.
4) Install bearing cap as previously outlined and evenly toque cap
bolts to specified torque.
Bearing cap MUST be torqued to specification in order to assure
proper reading of clearance.
Tightening Torque
(a): 54 N
.m (5.4 kg-m, 39.0 lb-ft)
NOTE:
Do not rotate crankshaft while gaging plastic is installed.

6A1-72 ENGINE MECHANICAL (G13B, 1-CAM 16-VALVES ENGINE)
5) Remove cap and using scale (2) on gaging plastic (1) envelope,
measure gaging plastic width at its widest point. If clearance ex-
ceeds its limit, replace bearing. Always replace both upper and
lower inserts as a unit.
A new standard bearing may produce proper clearance. If not,
it will be necessary to regrind crankshaft journal for use of 0.25
mm undersize bearing.
After selecting new bearing, recheck clearance.
StandardLimit
Bearing clearance0.020 – 0.040 mm
(0.0008 – 0.0016 in.)0.060 mm
(0.0023 in.)
Selection of main bearings
STANDARD BEARING:
If bearing is in malcondition, or bearing clearance is out of specifica-
tion, select a new standard bearing according to the following pro-
cedure and install it.
1) First check journal diameter by using the following procedure.
As shown in figure, crank webs (1) of No.2 and No.3 cylinders
have five stamped numerals.
Three kinds of numerals (“1”, “2” and “3”) represent the following
journal diameters.
Numeral stamped
Journal diameter
144.994 – 45.000 mm
(1.7714 – 1.7716 in.)
244.988 – 44.994 mm
(1.7712 – 1.7714 in.)
344.982 – 44.988 mm
(1.7709 – 1.7712 in.)
The first, second, third, fourth and fifth (left to right) stamped nu-
merals represent journal diameters at bearing caps “1”, “2”, “3”,
“4” and “5” respectively.
For example, in figure, the first (leftmost) numeral “3” indicates
that journal dia. at bearing cap “1” is within 44.982 – 44.988 mm,
and second one “1” indicate that journal dia. at cap “2” is within
44.994 – 45.000 mm.

2. Scale
1. Paint
6A1-74 ENGINE MECHANICAL (G13B, 1-CAM 16-VALVES ENGINE)
4) From numerals stamped on crank webs (1) of No.2 and No.3 cyl-
inders and the alphabets stamped on mating surface of cylinder
block, determine new standard bearing to be installed to journal,
by referring to table given below.
For example, if numeral stamped on crank web is “1” and alpha-
bet stamped on mating surface is “B”, install a new standard
bearing painted in “Black” to its journal.
Numeral stamped on crank web
(Journal diameter)
123
Alphabet stamped
ti f
AGreenBlackColorless
on mating surface
(Bearing capboreBBlackColorlessYellow(Bearing ca bore
dia.)CColorlessYellowBlue
New standard bearing to be installed.
5) Using gaging plastic (1), check bearing clearance with newly se-
lected standard bearing.
If clearance still exceeds its limit, use next thicker bearing and
recheck clearance.
6) When replacing crankshaft or cylinder block due to any reason,
select new standard bearings to be installed by referring to nu-
merals stamped on new crankshaft or alphabets stamped on
mating surface of new cylinder block.
UNDERSIZE BEARING (0.25 mm):

0.25 mm undersize bearing is available, in five kinds varying in
thickness.
To distinguish them, each bearing is painted in the following col-
ors at such position as indicated in figure.
Each color represents the following thicknesses at the center of
bearing.
Color painted
Bearing thickness
Green & Red2.121 – 2.125 mm
(0.0835 – 0.0836 in.)
Black & Red2.124 – 2.128 mm
(0.0836 – 0.0837 in.)
Red only2.127 – 2.131 mm
(0.0837 – 0.0838 in.)
Yellow & Red2.130 – 2.134 mm
(0.0838 – 0.0839 in.)
Blue & Red2.133 – 2.137 mm
(0.0839 – 0.0840 in.)