Nissan Terrano r20e. Instruction — part 303
Measurement of Compression Pressure
1. Warm up engine and switch off the ignition switch.
2. Remove glow plate and glow plugs.
3. Fit compression gauge adapter to cylinder head.
Compression gauge adapter:
: 15 - 20 N
⋅
m
(1.5 - 2.0 kg-m, 11 - 14 ft-lb)
4. Ensure the ignition switch is in the “LOCK” position and discon-
nect harness connector (gray colored) from injection pump.
5. Crank engine, then read gauge indication.
I
Always use a fully-charged battery to obtain specified
engine revolution.
I
Engine compression measurement should be made as
quickly as possible.
Compression pressure:
Unit: kPa (bar, kg/cm
2
, psi)/200 rpm
Standard
2,942 (29.4, 30, 427)
Minimum
2,452 (24.5, 25, 356)
Differential limit between cylinders
294 (2.9, 3, 43)
6. If cylinder compression in one or more cylinders is low, pour a
small amount of engine oil into cylinders through the glow holes
and retest compression.
I
If adding oil helps the compression pressure, piston rings
may be worn or damaged.
I
If pressure stays low, valve may be sticking or seating
incorrectly.
I
If cylinder compression in any two adjacent cylinders is
low, and if adding oil does not help the compression, there
is leakage past the gasket surface.
Leakage past the cylinder gasket can result in oil and water
becoming mixed in the engine block cooling and lubrica-
tion chambers.
SEM618B
NEM005
SEM355F
COMPRESSION PRESSURE
TD27Ti
EM-103
q
1
Rocker cover
q
2
Rocker cover gasket
q
3
Valve cotter
q
4
Spring retainer
q
5
Valve oil seal
q
6
Valve spring
Valve spring ring
q
7
Injection nozzle holder
q
8
Nozzle washer
q
9
Nozzle gasket
q
10
Cylinder head
q
11
Valve seat
q
12
Intake valve
q
13
Exhaust valve
q
14
Valve lifter
q
15
Cylinder head gasket
q
16
Push rod
q
17
Glow plug
q
18
Rocker shaft
NEM239
CYLINDER HEAD
TD27Ti
EM-104
Removal
1. Set No. 1 cylinder at TDC on its compression stroke.
2. Drain engine coolant from drain plugs on cylinder block and
radiator.
3. Remove air cleaner and intercooler components.
4. Remove the following parts:
— Water temperature connectors
— Throttle chamber vacuum hoses
— EGR valve vacuum hose
— Connectors located on the intake manifold
— Connector located on the thermostat housing
— Heater tubes
— Connectors of the injection pump
5. Remove alternator adjusting bolt.
6. Disconnect exhaust manifold from front exhaust tube.
7. Remove turbocharger oil and water tubes.
8. Remove turbocharger bracket bolts.
9. Disconnect radiator outlet hose and thermostat housing water
inlet hose.
10. Remove fuel injection tube assembly and spill tube.
11. Remove injection nozzle holder from first cylinder with a spe-
cial tool (KV119E0030). Remove injection nozzles from cylin-
ders 2, 3 and 4 using a deep socket wrench.
12. Remove thermostat housing bolts shown at left.
13. Remove rocker cover and ventilation hose.
14. Remove rocker shaft with rocker arms.
15. Remove push rods.
16. Remove cylinder head bolts in numerical order and remove
cylinder head.
Head warpage or cracking could result from removing in incor-
rect order.
EEM092
SEM621B
EEM103
SEM623B
CYLINDER HEAD
TD27Ti
EM-105
Disassembly
1. Remove following parts:
I
EGR tube
I
Intake manifold
I
Heat shield plates
I
Exhaust manifold
I
Thermostat housing
I
Alternator adjusting bar & engine slinger
I
Glow plate and glow plugs
2. Remove valve component parts with Tool.
3. Remove valve oil seals with Tool.
4. Disassemble rocker shaft assembly.
a. Remove rocker shaft lock bolt.
b. Remove valve rocker and rocker shaft bracket.
If it is difficult to remove rocker shaft brackets, immerse rocker
shaft assembly in oil of 70°C (158°F) for a few minutes and
then remove brackets.
SEM624B
SEM625B
SEM626B
NEM160
CYLINDER HEAD
TD27Ti
EM-106
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