Hyundai Elantra AD: Timing System

Sixth generation (AD; 2017–2020) / Hyundai Elantra AD 2017-2020 Service Manual / Engine Mechanical System / Timing System

Components and Components Location

Components

1. Intake camshaft
2. Exhaust camshaft
3. Intake CVVT assembly
4. Exhaust CVVT assembly
5. Timing chain
6. Timing chain tensioner arm
7. Timing chain tensioner

8. Timing chain guide
9. Timing chain cover
10. Service plug bolt & gasket
11. Front oil seal
12. Crankshaft damper pulley
13. Intermediate lock CVVT actuator

Drive Belt Repair procedures

Removal

Remove the drive belt.

(1)	Using the wrench, turning the drive belt tensioner (A) counterclockwise.

(2)	Disconnect the drive belt (A).

(3)	Remove the drive belt tensioner (A) and then remove the drive belt (B).

Inspection

Check belt for maintenance and abnormal wear of V-ribbed part. Replace if necessary.

•	Do not bend, twist or turn the drive belt inside out.

•	Do not allow the drive belt to come into contact with oil, water and steam.

Visually check the belt for excessive wear, frayed cords etc.

If any defect has been found, replace the drive belt.

•	Cracks on the rib side of a belt are considered acceptable. If the belt has chunks missing from the ribs, it should be replaced.

Drive belt tension measurement and adjustment

Belt tension measurement

Measure the belt tension using a mechanical tension gauge or a sonic tension meter.

Belt tension

New belt:

637.4 ~ 735.5 N (65 ~ 75 kgf, 143.3 ~ 165.3 lbf)

Used belt:

441.3 ~ 539.4 N (45 ~ 55 kgf, 99.2 ~ 121.3 lbf)

•	If the engine has run for 5 minutes or more, the belt tension must be adjusted as a used belt.

•	When installing the V-ribbed belt, all grooves on the pulley should be covered with belt ribs.

•	A loose belt causes slip noise.

•	Too tight belt cause bearing of alternator and water pump to damage.

Using a mechanical tension gauge (BT-33-73F, BTG-2 type)

1.	While pressing the handle (A) of the gauge, insert the belt (B) between pulley and pulley (or idler) into the gap between spindle (C) and hook (D).

2.	After releasing the handle (A), read a value on the dial pointed by the indicator (B).

Using a sonic tension meter (U-505/507 type)

Input the belt specifications into the tension meter (A).

Belt type	Location of measurement	Input data
Belt type	Location of measurement	M (Mass, g/m.rib)	W (Width, rib)	S (Span, mm)
With A/C	Crankshaft pulley to A/C compressor pulley	14.1	006.0	187
Without A/C	Crankshaft pulley to alternator pulley	14.1	006.0	Actual measurement value

•	Measurement of S (Span): Caculate average value after measuring the distance 3~4 times.

2.	Locate the micro phone (B) close to the center of belt span (A) and bounce the belt by finger 2~3 times. Read a value on the display. [With A/C] [Without A/C]

Installation

Install the drive belt.

(1)

Install the drive belt (B) and then install the drive belt tensioner (A).

Tightening torque :

center bolt : 29.4 ~ 41.2 N.m (3.0 ~ 4.2 kgf.m, 21.7 ~ 30.4 lb-ft)

fixing bolt : 39.2 ~ 49.0 N.m (4.0 ~ 5.0 kgf.m, 28.9 ~ 36.2 lb-ft)

(2)	Using the wrench, turning the drive belt tensioner (A) counterclockwise.

(3)	Connect the drive belt (A).

(4)	Remove the wrench.

Idler Repair procedures

Removal and Installation

1.	Remove the drive belt. (Refer to Timing System - "Drive Belt")

Remove the idler (A).

Tightening torque :

39.2 ~ 49.0N.m (4.0 ~ 5.0kgf.m, 28.9 ~ 36.2lb-ft)

3.	Install in the reverse order of removal.

Inspection

Check the idler for excessive oil leakage, abnormal rotation or vibration. Replace if necessary.

Drive Belt Tensioner Components and Components Location

Components

1. Drive belt tensioner

Drive Belt Tensioner Repair procedures

Removal and Installation

1.	Disconnect the drive belt. (Refer to Timing System - "Drive Belt")

Remove the drive belt tensioner (A).

Tightening torque :

center bolt : 29.4 ~ 41.2 N.m (3.0 ~ 4.2 kgf.m, 21.7 ~ 30.4 lb-ft)

fxing bolt : 39.2 ~ 49.0 N.m (4.0 ~ 5.0 kgf.m, 28.9 ~ 36.2 lb-ft)

3.	Install in the reverse order of removal.

Crankshaft Damper Pulley Components and Components Location

Components

1. Crankshaft damper pulley

Crankshaft Damper Pulley Repair procedures

Removal and Installation

1.	Remove the RH front wheel. (Refer to Suspension System - "Wheel")

2.	Remove the drive belt. (Refer to Timing System - "Drive Belt")

3.	Remove the engine room under cover. (Refer to Engine And Transaxle Assembly - "Engine Room Under Cover")

Remove the crankshaft damper pulley (A).

Tightening torque :

196.1 ~ 205.9 N.m (20.0 ~ 21.0 kgf.m, 144.7 ~ 151.9lb-ft)

•	Do not press the pulley or apply the excessive force to prevent the rubber part from being deformed.

There are two methods to hold the ring gear when removing the crankshaft damper pulley.

•	Install the SST (09231-2B100, 09231-3N100) to hold the ring gear after removing the starter.

•	Install the SST (09231-3D100, 09231-2W100) to hold the ring gear after removing the service cover.

1.	Remove the transaxle mounting bolt (A) and the service cover (B) on the bottom of the lower crankcase.

2.	Remove the transaxle mounting bolt (C) on the bottom of the lower crankcase.

3.	Adjust the length of the holder (A) so that the grooves of the holder puts into the ring gears (B) at the closest position.

4.	Adjust the angle and length of the links (C) so that the two transaxle mounting bolts can be fastened into the original mounted holes.

5.	Install the SST using the two transaxle mounting bolts. Tighten the bolts and nuts of the holder and links securely.

5.	Install in the reverse order of removal.

Inspection

Check the crankshaft damper pulley for vibration in rotation, oil dust deposit of V-ribbed part. Replace if necessary.

Front Oil Seal Components and Components Location

Components

1. Front oil seal

Front Oil Seal Repair procedures

Replacement

1.	Remove the crankshaft damper pulley. (Refer to Timing System - "Crankshaft Damper Pulley")

2.	Remove the front oil seal (A).

Apply engine oil on the edge of new oil seal.

•	Remove any debris from the lip portion of the oil seal.

Using the SST (09231-2E000), install a front oil seal (A).

•	Do not reuse the front oil seal.

5.	Install the crankshaft damper pulley. (Refer to Timing System - "Crankshaft Damper Pulley")

Timing Chain Cover Components and Components Location

Components

1. Timing chain cover

2. Service plug bolt & gasket

Timing Chain Cover Repair procedures

Removal

Engine removal is not required for this procedure.

•	Use fender covers to avoid damaging painted surfaces.

•	To avoid damage, unplug the wiring connectors carefully while holding the connector portion.

•	Mark all wiring and hoses to avoid misconnection.

1.	Disconnect the battery negative terminal.

2.	Remove the RH front wheel. (Refer to Suspension System - "Wheel")

3.	Remove the engine room under cover. (Refer to Engine And Transaxle Assembly - "Engine Room Under Cover")

4.	Remove the engine cover. (Refer to Engine And Transaxle Assembly - "Engine Cover")

5.	Remove the cylinder head cover. (Refer to Cylinder Head Assembly – “Cylinder Head Cover”)

6.	Drain engine oil and remove the oil pan. (Refer to Lubrication System – “Oil Pan”) (Refer to Lubrication System - "Engine Oil")

7.	Remove the engine mounting support bracket. (Refer to Engine And Transaxle Assembly - "Engine Mounting")

8.	Remove the crankshaft damper pulley. (Refer to Timing System – “Crankshaft Damper Pulley")

9.	Remove the water pump pulley. (Refer to Cooling System - "Water pump")

10.	Remove the idler. (Refer to Timing System - "Idler")

11.	Remove the alternator. (Refer to Engine Electrical System – “Alternator”)

12.	Remove the front engine hanger (A).

13.	Remove the intermediate lock CVVT actuator (A).

14.

Remove the timing chain cover (A) by gently prying the gaps between the cylinder head and cylinder block.

•	Be careful not to damage the contact surfaces of cylinder block, cylinder head and timing chain cover.

Installation

Install the timing chain cover.

(1)	Using a gasket scraper, remove all the old packing material from the gasket surfaces.

(2)	The sealant locations on the chain cover and the counter parts (cam carrier, cylinder head, cylinder block, and lower crankcase) must be free of harmful foreign materials, oil, dust and moisture. Spraying cleaner on the surface and wiping with a clean duster.

(3)

Before assembling the timing chain cover, liquid sealant should be applied on the gap between cam carrier, cylinder head and cylinder block.

Bead width: 3.0 ~ 5.0 mm (0.11 ~ 0.20 in.)

Sealant: Threebond 1217H or equivalent

(4)

After applying liquid sealant on the timing chain cover, assemble the cover within 5 minutes after sealant was applied. Continuous bead of sealant should be applied to prevent any path from oil leakage.

Bead width

Whole section: 2.5 ~ 3.5 mm (0.10 ~ 0.14 in.)

Section A: 4.5 ~ 5.5 mm (0.18 ~ 0.22 in.)

Section B: 8.0 ~ 9.0 mm (0.32 ~ 0.35 in.)

Sealant: Threebond 1217H or equivalent

(5)

Install the timing chain cover. The dowel pins on the cylinder block and holes on the timing chain cover should be used as a reference in order to assemble the timing chain cover in exact position.

Tightening torque

Bolts (A, B):

18.6 ~ 23.5 N.m (1.9 ~ 2.4 kgf.m, 13.7 ~ 17.4 lb-ft)

Bolt (C):

19.6 ~ 23.5 N.m (2.0 ~ 2.4 kgf.m, 14.5 ~ 17.4 lb-ft)

Bolts (D,E):

39.2 ~ 49.0 N.m (4.0 ~ 5.0 kgf.m, 28.9 ~ 36.2 lb-ft)

Bolt (F):

9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)

•	Do not reuse the seal bolts (C,F).

•	The engine running or pressure test should not be performed within 30 minutes after the timing chain cover was assembled.

2.	Replace the front oil seal if necessary. (Refer to Timing System - “Front Oil Seal”)

Install the intermediate lock CVVT actuator (A).

Tightening torque :

8.8 ~ 9.8 N.m (0.9 ~ 1.0 kgf.m, 6.5 ~ 7.2 lb-ft)

•	Always use new actuator bolts.

•	The residue inside of the chain-cover bolt hole should be disposed before locking.

•	The actuator bolts should be locked to the regulated torque.

Install the front engine hanger (A).

Tightening torque :

34.3 ~ 39.2 N.m (3.5 ~ 4.0 kgf.m, 25.3 ~ 28.9 lb-ft)

5.	Install the other parts reverse order of removal.

Add all the necessary fluids and check for leaks. Connect GDS. Check for codes, note, and clear. Recheck.

•	Refill engine with engine oil.

•	Clean battery posts and cable terminals and assemble.

•	Inspect for fuel leakage.

-	After assembling the fuel line, turn on the ignition switch (do not operate the starter) so that the fuel pump runs for approximately two seconds and fuel line pressurizes.

-	Repeat this operation two or three times, then check for fuel leakage at any point in the fuel line.

Timing Chain Components and Components Location

Components

1. Intake camshaft
2. Exhaust camshaft
3. Intake CVVT assembly
4. Exhaust CVVT assembly

5. Timing chain
6. Timing chain tensioner arm
7. Timing chain tensioner
8. Timing chain guide

Timing Chain Repair procedures

Removal

1.	Remove the cylinder head cover. (Refer to Cylinder Head Assembly - "Cylinder Head Cover")

Set No.1 cylinder to TDC (Top dead center) on compression stroke.

(1)	Turn the crankshaft pulley and align its groove with the timing mark of the timing chain cover.

(2)

Check that the TDC marks of the intake and exhaust CVVT sprockets are in straight line on the cylinder head surface as shown in the illustration. If not, turn the crankshaft by one revolution (360°) more.

•	Do not turn the crankshaft pulley counterclockwise.

3.	Remove the timing chain cover. (Refer to Timing System - "Timing Chain Cover")

Remove the timing chain tensioner (A).

•	Do not reuse the detached tensioner.

•	If need to reuse the tensioner, remove the tensioner, make the piston (A) to protrude maximally, push the piston (A) to the end, and then mount the stopper pin. At this time, the tensioner fixing pin should be placed in the same way as when the product was first delivered from the factory.

5.	Remove the timing chain tensioner arm (A).

6.	Remove the timing chain (A).

7.	Remove the timing chain guide (A).

Inspection

Sprockets, Chain Tensioner, Chain Guide, Chain Tensioner Arm

1.	Check the CVVT sprocket and crankshaft sprocket for abnormal wear, cracks, or damage. Replace if necessary.

2.	Inspect the tensioner arm and chain guide for abnormal wear, cracks, or damage. Replace if necessary.

3.	Check that the tensioner piston moves smoothly.

Installation

1.	The TDC marks of the intake and exhaust CVVT sprockets are slightly turned from the TDC position as shown when the timing chain is removed.

2.	Turn the crankshaft clockwise (about 2~3 pitches) from the TDC position (the dowel pin (A) of crankshaft is about 3° with the engine vertical line) as rotation of the intake CVVT sprocket from the TDC position.

Install the timing chain guide (A).

Tightening torque:

18.6 ~ 22.6 N.m (1.9 ~ 2.3 kgf.m, 13.7 ~ 16.6 lb-ft)

Install the timing chain tensioner arm (A).

Tightening torque:

18.6 ~ 22.6 N.m (1.9 ~ 2.3 kgf.m, 13.7 ~ 16.6 lb-ft)

Install the timing chain.

Crankshaft sprocket > Timing chain guide > Intake CVVT sprocket > Exhaust CVVT sprocket

(1)

Install the timing chain with no slack between the crankshaft sprocket and the intake CVVT sprocket.

•	The timing marks of each sprocket should be matched with timing marks (color link) of timing chain when installing the timing chain.

(2)

Install the timing chain on the exhaust CVVT sprocket with no slack while turning the CVVT assembly clockwise.

•	The timing mark of the exhaust CVVT sprocket should be matched with timing mark (color link) of timing chain when installing the timing chain.

•	Press down the timing chain links on the exhaust CVVT sprocket to prevent the sprocket from spinning.

Install the timing chain auto tensioner (A) and remove the stopper pin (B).

Tightening torque:

9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)

•	When reinstall the tensioner, check the ratchet function of the tensioner after removing the fixing pin by retracting the tensioner arm (A) maximally as shown below.

•	When maximally retracted, there should be no interference between the tensioner arm (A) and tensioner housing (B).

7.	After rotating crankshaft 2 revolutions in regular direction (clockwise viewed from front), confirm that the TDC marks on the intake and exhaust CVVT sprockets are aligned with the top surface of cylinder head.

8.	Install the other parts reverse order of removal.

•	Refill engine with engine oil.

•	Clean battery posts and cable terminals and assemble.

•	Inspect for fuel leakage.

-	After assembling the fuel line, turn on the ignition switch (do not operate the starter) so that the fuel pump runs for approximately two seconds and fuel line pressurizes.

-	Repeat this operation two or three times, then check for fuel leakage at any point in the fuel line.

Engine And Transaxle Assembly

Engine Cover Repair procedures Removal and Installation 1. Remove the engine cover (A). ...

Cylinder Head Assembly

Components and Components Location Components 1. Camshaft bearing cap 2. Camshaft front bearing cap 3. Exhaust camshaft 4. Intake camshaft 5. Exhaust CVVT asse ...