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d. Using the valve guide reamer (commercial service tool) (A),
apply reamer finish to valve guide.
2. If valve seat is removed in step 7 (DISASSEMBLY), install it.
Replace with oversize [0.5 mm (0.020 in)] valve seat.
a. Ream cylinder head recess diameter (a) for service valve seat.
Be sure to ream in circles concentric to valve guide center.
This will enable valve to fit correctly.
b. Heat cylinder head to 110 to 130°C (230 to 266°F) by soaking in
heated oil (A).
c. Provide valve seats cooled well with dry ice. Force fit valve seat into cylinder head.
WARNING:
Cylinder head contains heat. When working, wear protective equipment to avoid getting burned.
CAUTION:
Avoid directly touching cold valve seats.
d. Using the valve seat cutter set (commercial service tool) or valve
seat grinder, finish seat to the specified dimensions. Refer to
EM-139, "
CylinderHead".
CAUTION:
When using the valve seat cutter, firmly grip cutter handle
with both hands. Then, press on the contacting surface all
around the circumference to cut in a single drive. Improper
pressure on with cutter or cutting many different times may
result in stage valve seat.
e. Using compound, grind to adjust valve fitting.
f. Check again for normal contact. Refer to EM-104, "
Inspection".
3. Install new valve oil seals as follows:Standard
: Refer to EM-139,
"CylinderHead".
(Intake and exhaust)
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Oversize
: Refer to EM-139,
"CylinderHead".
(Intake and exhaust)
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SEM934C
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CYLINDER HEAD
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a. Apply new engine oil on valve oil seal joint and seal lip.
b. Install with the valve oil seal drift [SST: KV10115600 (J-38958)]
(A) press fit valve seal to height (b) shown in the figure.
NOTE:
Dimension: Height measured before valve spring seat installa-
tion.
4. Install valve spring seat.
5. Install valve.
Install it in the original position.
NOTE:
Larger diameter valves are for intake side.
6. Install valve spring (uneven pitch type).
Install narrow pitch end (paint mark) to cylinder head side
(valve spring seat side).
7. Install valve spring retainer.
8. Install valve collet.
Compress valve spring with the valve spring compressor [SST:
KV10116200 (J26336-A)] (A), the attachment [SST:
KV10115900 (J26336-20)] (C) and the adapter [SST:
KV10109220 ( — )] (B). Install valve collet with a magnet
hand.
CAUTION:
When working, take care not to damage valve lifter holes.
Tap valve stem edge lightly with plastic hammer after installa-
tion to check its installed condition.
9. Install valve lifter.
Install it in the original position.
10. Install spark plug tube.
Press-fit spark plug tube as follows:
a. Remove old liquid gasket adhering to cylinder head mounting hole.
b. Apply sealant to area within approximately 12 mm (0.47 in) from edge of spark plug tube press-fit side.
Use high strength thread locking sealant or equivalent. Intake and exhaust : 14.3 - 14.9 mm (0.563 - 0.587 in)
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A : Wide pitch
B : Narrow pitch
C : Paint mark
: Cylinder head side
Paint mark color: Blue
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EM-104
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c. Using a drift, press-fit spark plug tube so that its height (A) is as
specified in the figure.
CAUTION:
When press-fitting, take care not to deform spark plug
tube.
After press-fitting, wipe off liquid gasket protruding onto
cylinder-head upper face.
11. Install spark plug with the spark plug wrench (commercial service tool).
InspectionINFOID:0000000003802292
INSPECTION AFTER REMOVAL
Cylinder Head Bolts Outer Diameter
Cylinder head bolts are tightened by plastic zone tightening
method. Whenever the size difference between (C) and (B)
exceeds the limit, replace them with new one.
If reduction of outer diameter appears in a position other than (B),
use it as (B) point.
Cylinder Head Distortion
NOTE:
When performing this inspection, cylinder block distortion should be also checking. Refer to EM-143,
"CylinderBlock".
1. Using a scraper, wipe off oil, scale, gasket, sealant and carbon deposits from surface of cylinder head.
CAUTION:
Never allow gasket fragments to enter engine oil or engine coolant passages.
2. At each of several locations on bottom surface of cylinder head,
measure the distortion in six directions (A), (B), (C), (D), (E) and
(F).
If it exceeds the limit, replace cylinder head.
INSPECTION AFTER DISASSEMBLY
Valve Dimensions
Check the dimensions of each valve. For the dimensions, refer to EM-139, "CylinderHead".
If dimensions are out of the standard, replace valve and check valve seat contact. Refer to "Valve Seat Con-
tact".
Valve Guide Clearance
Valve Stem Diameter
B : High strength thread locking sealant application area
Standard press-fit height: 37.7 - 38.7 mm (1.484 - 1.524 in)
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Limit [(C) - (B)] : 0.11 mm (0.0043 in)
A : Measuring point
d : 11 mm (0.43 in)
e : 48 mm (1.89 in)
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Limit : Refer to EM-139, "CylinderHead".
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Measure the diameter of valve stem with micrometer (A).
Valve Guide Inner Diameter Measure the inner diameter of valve guide with bore gauge.
Valve Guide Clearance (Valve guide clearance) = (Valve guide inner diameter) – (Valve stem diameter)
If the calculated value exceeds the limit, replace valve and/or valve guide. When valve guide must be
replaced, refer to EM-100, "
Disassembly and Assembly".
Valve Seat Contact
After confirming that the dimensions of valve guides and valves are within the specifications, perform this
procedure.
Apply prussian blue (or white lead) onto contacting surface of valve seat to check the condition of the valve
contact on the surface.
Check if the contact area band is continuous all around the circumference.
If not, grind to adjust valve fitting and check again. If the contacting
surface still has “NG” conditions (B) even after the recheck,
replace valve seat. Refer to EM-100, "
Disassembly and Assem-
bly".
Valve Spring Squareness
Set a try square (A) along the side of valve spring and rotate
spring. Measure the maximum clearance between the top of spring
and try square.
If it exceeds the limit, replace valve spring.
Valve Spring Dimensions and Valve Spring Pressure Load
Standard
: Refer to EM-139,
"CylinderHead".
(Intake and exhaust)
Standard
: Refer to EM-139,
"CylinderHead".
(Intake and exhaust)
Valve guide clearance
: Refer to EM-139, "
CylinderHead".
Standard and limit (Intake and exhaust)
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A: OK
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B: Contact
Limit : Refer to EM-139, "CylinderHead".
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Check the valve spring pressure at specified spring height.
If the installation load or load with valve open is out of the stan-
dard, replace valve spring.
INSPECTION AFTER INSTALLATION
Inspection for Leakage
The following are procedures for checking fluids leak, lubricates leak and exhaust gases leak.
Before starting engine, check oil/fluid levels including engine coolant and engine oil. If less than required
quantity, fill to the specified level. Refer to MA-11, "
Fluids and Lubricants".
Use procedure below to check for fuel leakage.
- Turn ignition switch “ON” (with engine stopped). With fuel pressure applied to fuel piping, check for fuel leak-
age at connection points.
- Start engine. With engine speed increased, check again for fuel leakage at connection points.
Run engine to check for unusual noise and vibration.
Warm up engine thoroughly to check there is no leakage of fuel, exhaust gases, or any oil/fluids including
engine oil and engine coolant.
Bleed air from lines and hoses of applicable lines, such as in cooling system.
After cooling down engine, again check oil/fluid levels including engine oil and engine coolant. Refill to the
specified level, if necessary.
Summary of the inspection items:
*: Transmission/transaxle/CVT fluid, power steering fluid, brake fluid, etc.
Standard (Intake and exhaust)
: Refer to EM-139,
"CylinderHead". Free height
Installation height
Installation load
Height during valve open
Load with valve open
SEM113
Items Before starting engine Engine running After engine stopped
Engine coolant Level Leakage Level
Engine oil Level Leakage Level
Other oils and fluid* Level Leakage Level
Fuel Leakage Leakage Leakage
Exhaust gases — Leakage —
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CYLINDER BLOCK
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CYLINDER BLOCK
Exploded ViewINFOID:0000000003802293
VQ25DE
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1. Reinforcement plate 2. Drive plate 3. Rear oil seal retainer
4. Cylinder block 5. Knock sensor 6. Sub harness
7. Thrust bearing (upper) 8. Main bearing (upper) 9. Crankshaft
10. Crankshaft key 11. Thrust bearing (lower) 12. Main bearing (lower)
13. Main bearing cap 14. Main bearing cap bolt 15. Main bearing beam
16. Baffle plate 17. Connecting rod bolt 18. Connecting rod bearing cap
19. Connecting rod bearing 20. Connecting rod 21. Snap ring
22. Piston pin 23. Piston 24. Oil ring
25. Second ring 26. Top ring 27. Pilot converter
A. Crankshaft side B. Chamfered C. Refer to EM-110
D. Front mark
Refer to GI-4, "
Components" for symbols in the figure.
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1. Reinforcement plate 2. Drive plate 3. Rear oil seal retainer
4. Sub harness 5. Knock sensor 6. Cylinder block
7. Thrust bearing (upper) 8. Main bearing (upper) 9. Crankshaft
10. Crankshaft key 11. Thrust bearing (lower) 12. Main bearing (lower)
13. Main bearing cap 14. Main bearing cap bolt 15. Main bearing beam
16. Baffle plate 17. Connecting rod bolt 18. Connecting rod bearing cap
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