CYLINDER HEAD
Exploded View
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1. |
Valve lifter |
2. |
Valve collet |
3. |
Valve spring retainer |
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4. |
Valve oil seal |
5. |
Valve spring (INT) |
6. |
Valve spring seat |
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7. |
Valve guide (INT) |
8. |
Valve spring (EXH) |
9. |
Valve guide (EXH) |
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10. |
Spark plug |
11. |
Spark plug tube |
12. |
Cylinder head bolt |
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13. |
Cylinder head (bank 1) |
14. |
Cylinder head gasket (bank 1) |
15. |
Valve (EXH) |
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16. |
Valve seat (EXH) |
17. |
Valve seat (INT) |
18. |
Valve (INT) |
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19. |
Cylinder head gasket (bank 2) |
20. |
Cylinder head (bank 2) |
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A. |
Refer to Disassembly and Assembly (GT-R certified NISSAN dealer) |
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 : Apply thread locking sealant. |
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Refer to Components for symbol marks not described on the above. |
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Disassembly and Assembly
DISASSEMBLY- 1.Remove the following parts:
- Intake manifold collector: Refer to Exploded View.■ CAUTION ■Mark the parts with paint in advance of the reinstallation to prevent misalignment between the intake manifold collector and intake manifold.
- Rocker cover: Refer to Exploded View.
- Fuel tube and fuel injector assembly: Refer to Exploded View.
- Exhaust manifold and turbocharger assembly: Refer to Exploded View.
- Water inlet and thermostat assembly: Refer to Exploded View (GT-R certified NISSAN dealer).
- Water outlet, water pipe and heater pipe: Refer to Exploded View (GT-R certified NISSAN dealer).
- Timing chain: Refer to Exploded View (GT-R certified NISSAN dealer).
- Rear timing chain case: Refer to Exploded View (GT-R certified NISSAN dealer).
- Camshaft: Refer to Exploded View (GT-R certified NISSAN dealer).
- 2.Remove spark plug with spark plug wrench (commercial service tool).
- 3.Remove cylinder head.
- Loosen mounting bolts in several steps in reverse order as shown in the figure with power tool.
| A | : Bank 1 |
| B | : Bank 2 |
 | : Engine front |
- 4.Remove cylinder head gaskets.
- 5.Remove valve lifter.
- Identify installation positions, and store them without mixing them up.
- 6.Remove valve collet.
- Compress valve spring with the valve spring compressor [SST: KV10116200 (J‐26336‐A)] (A), the attachment [SST: KV10115900 (J26336‐20)] (C) and the adapter [SST: KV10109220 ( — )] (B). Remove valve collet with a magnet hand.
■ CAUTION ■
When working, take care not to damage valve lifter holes.- 7.Remove valve spring retainer, valve spring and valve spring seat.
- 8.Push valve stem to combustion chamber side, and remove valve.
- Identify installation positions, and store them without mixing them up.
- 9.Remove valve oil seal using the valve oil seal puller [SST: KV10107902 (J38959)] (A).
- 10.Remove valve seat, if valve seat must be replaced.
- Bore out old seat until it collapses. Boring should not continue beyond the bottom face of the seat recess in cylinder head. Set the machine depth stop to ensure this. Refer to Cylinder Head (GT-R certified NISSAN dealer).■ CAUTION ■Prevent to scratch cylinder head by excessive boring.
- 11.Remove valve guide, if valve guide must be replaced.
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(1)To remove valve guide, heat cylinder head to 110 to 130°C (230 to 266°F) by soaking in heated oil (A).
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(2)Drive out valve guide with a press [under a 20 kN (2 ton, 2.2 US ton, 2.0 lmp ton) pressure] or a hammer and the valve guide drift (commercial service tool).
■ WARNING ■
Cylinder head contains heat. When working, wear protective equipment to avoid getting burned.- 12.Remove spark plug tube, if necessary.
- Using a pliers, pull spark plug tube out of cylinder head.
- Take care not to damage cylinder head.
- Once removed, spark plug tube will be deformed and cannot be reused. Never remove it unless absolutely necessary.
■ CAUTION ■
ASSEMBLY- 1.Install valve guide, if removed. Replace with oversized [0.2 mm (0.008 in)] valve guide.
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(1)Using the valve guide reamer (commercial service tool) (A), ream cylinder head valve guide hole.
| Valve guide hole diameter (for service parts): | ||
| Intake and exhaust | ||
| : Refer to Cylinder Head (GT-R certified NISSAN dealer). | ||
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(2)Heat cylinder head to 110 to 130°C (230 to 266°F) by soaking in heated oil (A).
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(3)Using the valve guide drift (commercial service tool), press valve guide from camshaft side to the dimensions as in the figure.
| Projection (A) | ||
| : Refer to Cylinder Head (GT-R certified NISSAN dealer). | ||
■ WARNING ■
Cylinder head contains heat. When working, wear protective equipment to avoid getting burned.-
(4)Using the valve guide reamer (commercial service tool) (A), apply reamer finish to valve guide.
| Standard | : Refer to Cylinder Head (GT-R certified NISSAN dealer). |
- 2.Install valve seat, if removed. Replace with oversize [0.5 mm (0.020 in)] valve seat.
- Be sure to ream in circles concentric to valve guide center. This will enable valve to fit correctly.
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(1)Ream cylinder head recess diameter (a) for service valve seat.
| Oversize | : Refer to Cylinder Head (GT-R certified NISSAN dealer). |
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(2)Heat cylinder head to 110 to 130°C (230 to 266°F) by soaking in heated oil (A).
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(3)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.-
(4)Using the valve seat cutter set (commercial service tool) or valve seat grinder, finish seat to the specified dimensions. Refer to Cylinder Head (GT-R certified NISSAN dealer).
■ 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. -
(5)Using compound, grind to adjust valve fitting.
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(6)Check again for normal contact. Refer to Inspection (GT-R certified NISSAN dealer) .
- 3.Install spark plug tube.
- Press-fit spark plug tube as follows:
- When press-fitting, take care not to deform spark plug tube.
- After press-fitting, wipe off locking sealant protruding onto cylinder-head upper face.
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(1)Remove old locking sealant adhering to cylinder head mounting hole.
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(2)Apply sealant to spark plug tube press-fit side.Use Genuine High Strength Locking Sealant or equivalent. Refer to Recommended Chemical Products and Sealants.
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(3)Using drift, press-fit spark plug tube so that its height is as specified in the figure.
| Standard press-fit height (a): | |
| : 34.6 - 35.6 mm (1.362 - 1.402 in) | |
■ CAUTION ■
- 4.Install new valve oil seals as follows:
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(1)Apply new engine oil on valve oil seal joint and seal lip.
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(2)Install with the valve oil seal drift [SST: KV10115600 (J‐38958)] (A) to match dimension in the figure.
| Height (b) (Without valve spring seat installed) | ||
| Intake and exhaust | : 13.3 - 13.9 mm (0.524 - 0.547 in) | |
- 5.Install valve.
NOTE：
Larger diameter valves are for intake side.- 6.Install valve spring seat.
- 7.Install valve spring (uneven pitch type).
- Install narrow pitch end [paint mark (A)] to cylinder head side (valve spring seat side).
: Cylinder head side Paint mark color Intake : Blue Exhaust : Pink
- 8.Install valve spring retainer.
- 9.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 installation to check its installed condition.
- 10.Turn crankshaft until No. 1 piston is set at TDC.
- Crankshaft key should line up with the bank 1 cylinder center line as shown in the figure.
| 1 | : Crankshaft key |
| : Bank 1 side |
- 11.Install new cylinder head gaskets.
- 12.Install cylinder head as follows:
- If cylinder head bolts re-used, check their outer diameters before installation. Refer to Inspection (GT-R certified NISSAN dealer).
- Before installing cylinder head, inspect cylinder head and cylinder block distortion. Refer to Inspection (GT-R certified NISSAN dealer) or Inspection (GT-R certified NISSAN dealer).
- Tighten cylinder head bolts in numerical order as shown in the figure
- Check tightening angle indicated on the angle wrench indicator plate.
■ CAUTION ■
| A | : Bank 1 |
| B | : Bank 2 |
| : Engine front |
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(1)Apply new engine oil to threads and seat surfaces of cylinder head bolts.
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(2)Tighten all cylinder head bolts.
 : 40.0 N·m (4.1 kg-m, 30 ft-lb) |
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(3)Tighten all cylinder head bolts (clockwise).
| Angle tightening: | 65 degrees |
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(4)Tighten all cylinder head bolts again (clockwise).
| Angle tightening: | 65 degrees |
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(5)Completely loosen all cylinder head bolts.
| : 0 N·m (0 kg-m, 0 ft-lb) |
■ CAUTION ■
In step “e”, loosen bolts in reverse order of that indicated in the figure.-
(6)Tighten all cylinder head bolts.
| : 40.0 N·m (4.1 kg-m, 30 ft-lb) |
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(7)Tighten all cylinder head bolts (clockwise).
| Angle tightening: | 135 degrees |
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(8)Tighten all cylinder head bolts again (clockwise).
| Angle tightening: | 135 degrees |
■ CAUTION ■
Check the tightening angle by using the angle wrench [SST: KV10112100 (BT8653‐A)] (A). Avoid judgment by visual inspection without.
- 13.After installing cylinder head, measure distance between front end faces of cylinder block and cylinder head (bank 1 and bank 2).
- If measured value is out of the standard, re-install cylinder head.
| Standard | : 14.1 - 14.9 mm (0.555 - 0.587 in) |
- 14.Install valve lifter.
- Install it in the original position.
- 15.Install in the reverse order of removal after this step.
Inspection
INSPECTION AFTER DISASSEMBLY
Cylinder Head DistortionNOTE：
When performing this inspection, cylinder block distortion should be also checking. Refer to Inspection (GT-R certified NISSAN dealer).
- 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.
| Limit | : Refer to Cylinder Head. |
Cylinder Head Bolts Outer Diameter- Cylinder head bolts are tightened by plastic zone tightening method. Whenever the size difference between (A) and (B) exceeds the limit, replace them with new one.
c : 62 mm (2.441 in) d : 12 mm (0.472 in) Limit [(B) ‐ (A) ] : 0.16 mm (0.006 in) - If reduction of outer diameter appears in a position other than (A), use it as (A) point.
Valve Dimensions- Check the dimensions of each valve. For the dimensions, refer to Cylinder Head.
- If dimensions are out of the standard, replace valve and check valve seat contact. Refer to "VALVE SEAT CONTACT".
Valve Guide ClearanceValve Stem Diameter
- Measure the diameter of valve stem with micrometer (A).
Standard : Refer to Cylinder Head.
Valve Guide Inner Diameter
- Measure the inner diameter of valve guide with bore gauge.
Standard : Refer to Cylinder Head.
Valve Guide Clearance
- (Valve guide clearance) = (Valve guide inner diameter) – (Valve stem diameter)
Valve guide clearance : Refer to Cylinder Head. Standard and limit
- If the calculated value exceeds the limit, replace valve and/or valve guide. When valve guide must be replaced, refer to 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.
A : OK - If not, grind to adjust valve fitting and check again. If the contacting surface still has “NG” (B) conditions even after the re-check, replace valve seat. Refer to Disassembly and Assembly.
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.
B : Contact Limit : Refer to Cylinder Head. - If it exceeds the limit, replace valve spring.
Valve Spring Dimensions and Valve Spring Pressure Load- Check the valve spring pressure at specified spring height.
Standard : Refer to Cylinder Head. Free height Installation height Installation load Height during valve open Load with valve open - If the installation load or load with valve open is out of the standard, replace valve spring.
INSPECTION AFTER ASSEMBLY Inspection for LeaksThe 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 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 leakage 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: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 — *: Transmission/transaxle/CVT fluid, power steering fluid, brake fluid, etc.