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Nissan Juke F15. Manual - part 653

EM-166

< SYSTEM DESCRIPTION >

[MR EXCEPT FOR NISMO RS MODELS]

COMPONENT PARTS

Description

• A thin valve lifter is used.

• Because a material with high hardness and high wear resistance is

used, regular maintenance of the valve clearance is not necessary.

• To adjust the valve clearance, change the valve lifter.

• The thickness of the valve lifter top surface is set in 0.02 mm

increments. The thickness is identified by the 3-digit number

(stamp) on the inside of the valve lifter.

Specification

VALVE SPRING, VALVE SPRING SEAT, VALVE RETAINER

• A single beehive spring is used for the valve spring (1) For reduc-

ing friction and preventing surging.

• For improving assembly workability, the valve spring seat (2) is

press-fit into the valve spring. (An assembly is set for the spring

and seat.)

• The valve springs for the intake and exhaust valves are different.

Identifier colors are used (

part). The intake valve springs are

white, and the exhaust valve springs are yellow.

• Carbon steel is used for the valve spring retainer (3) to improve

durability and heat resistance. The smaller size made possible by

use of the beehive spring also reduces the weight.

VALVE OIL SEAL

A type with a press-fit metal ring is used.

Cylinder Head

INFOID:0000000012197352

CYLINDER HEAD

• The material is aluminum alloy, and a cross-flow V 4-valve DOHC

is used for the intake valve layout.

• The combustion chamber is a compact pent-roof type using a V

arrangement with a smaller valve holding angle.

• Siamese ports are used for the intake port and exhaust port.

• The fuel injector installation part is placed on the bottom of the

intake port, and injects fuel directly into the cylinder.

• The spark plugs are located at the centers of the combustion chambers to increase combustion efficiency.

NOTE:

• Cross-flow: Method of installing the intake and exhaust manifold so that it is split left/right with respect to the

cylinder head.

• Pent-roof combustion chamber: Combustion chamber with an angled roof

• Siamese port: Two ports joined together

: Oil supply hole

: Stamp mark

: Thickness of valve lifter top sur-
face

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Location

Intake

Exhaust

Valve lifter

Top surface thick-
ness

[mm(in)]

3.00 – 3.50 (0.11 - 0.138)

Number of settings

26 types

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: Exhaust side

: Spark plug mounting part

: Intake side

: Fuel injector mounting part

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COMPONENT PARTS

EM-167

< SYSTEM DESCRIPTION >

[MR EXCEPT FOR NISMO RS MODELS]

CYLINDER HEAD BOLT

• TORX-head (E18) M11

×1.25 size flange bolts are used.

• The bolt tightening method is double tightening in six stages and angle tightening (plastic region tightening)

to ensure even and stable tightening axial force.

CYLINDER HEAD GASKET

• A three-layer metal structure on a stainless steel base is used.

• The gasket thickness is 0.72 mm (when tightened), and the bore is

φ80.7 mm.

Front Cover

INFOID:0000000012197353

• An aluminum die-cast front cover is used.

• The VTC cover uses a split structure. The VTC cover contains oil

channels for the intake and exhaust valve timing controllers.

• It also contains a part for installation of the front oil seal.

Timing Chain

INFOID:0000000012197354

DESCRIPTION

• A timing chain which drives the camshaft and an oil pump drive

chain are used.

• A small-pitch silent chain is used for both chains.

• Using a small-pitch silent chain allows a smaller sprocket and other changes for a more compact and light-

weight camshaft drive system, and also reduces noise.

Specification

: VTC cover

: Front cover

: Front oil seal

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: Timing chain

: Camshaft sprocket (EXH side)

: Timing chain slack guide

: Chain tensioner (for timing chain)

: Crankshaft sprocket

: Oil pump drive chain

: Oil pump sprocket

: Chain tensioner
(for oil pump drive chain)

: Timing chain tension guide

: Camshaft sprocket (INT side)

: Matching mark (dark blue link)

: Matching mark (outer groove)

: Crankshaft key

: Matching mark (stamp)

: Matching mark (yellow link)

: Matching mark (outer groove)

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EM-168

< SYSTEM DESCRIPTION >

[MR EXCEPT FOR NISMO RS MODELS]

COMPONENT PARTS

TIMING CHAIN

• A small-pitch [6.35 mm (0.25 in)] silent chain is used.

• The silent chain reduces the engagement contact angle with the sprocket, and the smaller chain pitch

reduces the speed of engagement with the sprocket, reducing chain operating noise.

CHAIN TENSIONER

• A hydraulic chain tensioner with ratchet mechanism is used.

• The chain tensioner (for timing chain) applies optimal tension to the timing chain via the timing chain slack

guide by means of the engine oil pressure and spring force.

TIMING CHAIN GUIDE

• The timing chain tension guide is installed between the crankshaft sprocket and camshaft sprocket (INT).

The timing chain slack guide is installed between the camshaft sprocket (EXH) and crankshaft sprocket.

These prevent chain link skipping and reduce noise.

• A plastic shoe is used for each chain guide for reducing friction.

CRANKSHAFT SPROCKET

• Integrated sintered alloy sprockets for the timing chain and oil

pump drive chain are used.

• Carburizing is applied to all surfaces to improve rigidity and wear

resistance.

OIL PUMP DRIVE CHAIN

• An oil pump drive chain is used to drive the oil pump.

• In the same way as the timing chain, a silent chain is used for the

oil pump drive chain.

• A chain tensioner which includes a chain guide and coil spring is

used.

• The chain tensioner (for oil spring drive chain) is installed between

the crankshaft sprocket and oil pump sprocket (slack side).

Crankshaft Pulley

INFOID:0000000012197355

• A crankshaft pulley with cast-iron torsional damper is used.

• Angle tightening is used for tightening the crankshaft pulley bolts. The pulley has angle marks at 60

° inter-

vals for improved workability.

For camshaft
drive

Camshaft sprocket

No. of teeth

Crankshaft sprocket

No. of teeth

Timing chain

Total No. of links

162

No. of links between
timing marks

Between crankshaft sprocket and camshaft sprocket (INT)

Between camshaft sprocket (INT) and camshaft sprocket (EXH)

Oil pump drive

Crankshaft sprocket

No. of teeth

Oil pump sprocket

No. of teeth

Oil pump drive chain

Total No. of links

: Timing chain side

: Oil pump drive chain side

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: Oil pump drive chain

: Crankshaft sprocket

: Oil pump sprocket

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COMPONENT PARTS

EM-169

< SYSTEM DESCRIPTION >

[MR EXCEPT FOR NISMO RS MODELS]

Crankshaft

INFOID:0000000012197356

CRANKSHAFT

• A forged crankshaft with five journal supports is used.

• Four counterweights are installed to reduce vibration.

• Fillet rolling provided to the journals and both ends of the pins to

reinforce each shaft part.

• A micro finish is applied to the journal and pin surfaces to reduce

friction.

• A crankshaft position sensor signal plate is installed on the No. 4

counterweight.

MAIN BEARING AND MAIN BEARING CAP BOLT

• Five bearing supports are used.

• A selective assembly method is used for the main bearing to ensure correct crank journal clearance.

• The bolts are external TORX (T-type) bolts. Angle tightening is used to tighten the bolts to ensure even and

stable tightening axial force.

Piston

INFOID:0000000012197357

• A shallow part (A) is created in the piston top surface. This gener-

ates a tumble flow at the layered combustion compression stroke

and forms an ignitable mixed layer close to the spark plug.

• A thermal flow type is used to reduce the piston temperature.

• A plastic coating is applied to the piston skirt to reduce friction.

• A full-float method is used for the mating of the piston pin and con-

necting rod.

• Anodized aluminum treatment is performed for the piston top ring

groove to improve durability.

• Three rings are used: a narrow top ring, a second ring, and an oil

ring.

NOTE:

• Thermal flow type piston: A piston with only drill holes between the ring land and skirt to facilitate the flow of

heat from the top surface of the piston to the skirt.

• Anodized aluminum treatment: Sealing which forms a film by anodic oxidation of aluminum and aluminum

alloy to prevent corrosion.

• Tumble flow: Flow that swirls in the vertical direction inside the cylinder.

SPECIFICATION

Connecting Rod

INFOID:0000000012197358

• The connecting rod is a high-rigidity fracture-split type.

CAUTION:

: Counterweight

: Signal plate

: Engine front

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Piston

Standard diameter

[mm(in)]

φ79.67 (3.13)

Total height

a [mm(in)]

53.83 (2.12)

Compression height

b [mm(in)]

35.33 (1.39)

Pin hole diameter

c [mm(in)]

φ22 (0.87)

Material

Aluminum alloy

Piston pin

Outer diameter

× Bore

× Length

[mm(in)]

φ22 ×φ12.5 × 54.5

(0.87, 0.49, 2.14)

Material

Special carbon

steel

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