Hyundai Elantra AD: Intake And Exhaust System - Engine Mechanical System - Hyundai Elantra AD 2017-2020 Service ManualHyundai Elantra AD: Intake And Exhaust System

Air Cleaner Components and Components Location

Components

1. Air cleaner cover
2. Air cleaner element
3. Air cleaner body
4. Air duct
 5. Air intake hose
6. Breather hose
7. Resonator

Air Cleaner Repair procedures

Removal and Installation
Air Cleaner Assembly
1. Remove the engine cover.

(Refer to Engine And Transaxle Assembly - “Engine Cover”)
2. Disconnect the battery negative terminal.
3. Remove the air duct (A).

4. Disconnect the breather hose (A).
5. Disconnect the intake hose (B) and air cleaner assembly (C).
Tightening torque

Hose clamp :

2.9 ~ 4.9 N.m (0.3 ~ 0.5 kgf.m, 2.2 ~ 3.6 lb-ft)

Air cleaner bolts :

3.9 ~ 5.9 N.m (0.4 ~ 0.6 kgf.m, 2.9 ~ 4.3 lb-ft)

6. Install in the reverse order of removal.
Resonator
1. Disconnect the battery negative terminal.
2. Remove the air duct and air cleaner assembly.

(Refer to Intake and Exhaust System - "Air Cleaner")
3. Disconnect the wiring connectors and harness clamps and remove the connector brackets around the resonator.
4. Remove the resonator (A).
Tightening torque :

3.9 ~ 5.9 N.m (0.4 ~ 0.6 kgf.m, 2.9 ~ 4.3 lb-ft)

5. Install in the reverse order of removal.
Air Cleaner Element Replacement
1. Remove the clamp and open the air cleaner cover.
2. Replace the air cleaner element (A) with a new one.

  
• If there is any foreign substance inside the air cleaner assembly, clean the inside and replace the air cleaner element.
3. Close the air cleaner cover and engage the clamp.
  
• Insert the hinge (A) and engage the clamp when mounting the air cleaner cover.

Intake Manifold Components and Components Location

Components

1. Intake manifold assembly
2. Intake manifold gasket
3. Electronic throttle body
 4. Intake manifold stay
5. Variable intake solenoid (VIS) actuator
6. VCM motor

Intake Manifold Repair procedures

Removal and Installation
1. Remove the engine cover.

(Refer to Engine And Transaxle Assembly - “Engine Cover”)
2. Disconnect the battery negative terminal.
3. Remove the air duct and air cleaner assembly.

(Refer to Intake And Exhasut System - "Air Cleaner")
4. Remove the engine room under cover.

(Refer to Engine And Transaxle Assembly - "Engine Room Under Cover")
5. Disconnect the wiring connectors and harness clamps and remove the wiring protector around the intake manifold.
6. Disconnect the positive crankcase ventilation (PCV) hose (A).
7. Unfasten the electric throttle body control (ETC) module bolts.

(Refer to Engine Control/Fuel System - "ETC (Electric throttle body control) System")
8. Disconnect the vacuum hose (A) and purge control solenoid valve (PCSV) hose (B).
9. Remove the intake manifold stay (A).
Tightening torque :

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

10. Remove the intake manifold (A) with the gasket.
Tightening torque :

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

  
• When installing the intake manifold, tighten the bolts and nuts with pre-torque first, and then tighten the bolts and nuts with specified torque in the sequence shown.

11. Install in the reverse order of removal.

Variable Intake Solenoid(VIS) Actuator Repair procedures

Removal and Installation
1. Disconnect the vacuum hose (A).
2. Remove the variable Intake solenoid (VIS) actuator connector (B) and actuator (C).
Tightening torque :

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

3. Install in the reverse order of removal.

Exhaust Manifold Components and Components Location

Components

1. Heat protector
2. Exhaust manifold gasket
 3. Exhaust manifold
4. Exhaust manifold stay

Exhaust Manifold Repair procedures

Removal and Installation
1. Remove the engine cover.

(Refer to Engine And Transaxle Assembly - “Engine Cover”)
2. Disconnect the battery negative terminal.
3. Disconnect the oxygen sensor connectors (A).
4. Remove the engine room under cover.

(Refer to Engine And Transaxle Assembly - “Engine Room Under Cover”)
5. Remove the front muffler.

(Refer to Intake And Exhaust System - "Muffler")

6. Remove the exhaust manifold heat protector (A).
Tightening torque:

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

7. Remove the driveshaft heat protector (A).
Tightening torque:

19.6 ~ 29.4N.m (2.0 ~ 3.0kgf.m, 14.5 ~ 21.7lb-ft)

8. Remove the exhaust manifold stay (A).
Tightening torque :

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

9. Remove the exhaust manifold (A) with the gasket.
Tightening torque :

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

  
• When installing the intake manifold, tighten the nuts with pre-torque first, and then tighten the nuts with specified torque in the sequence shown.

10. Install in the reverse order of removal.
  
• When installing, replace with a new gasket.

Muffler Components and Components Location

Components

1. Front muffler
2. Catalytic converter & center muffler assembly
3. Main muffler
 4. Gasket
5. Hanger

Muffler Repair procedures

Removal and Installation
Front Muffler
1. Disconnect the battery negative terminal.
2. Disconnect the oxygen sensor connector (A).
3. Detach the rubber hanger (A) from the front muffler.
4. Remove the front muffler (B).
Tightening torque :

39.2 ~ 58.8 N.m (4.0 ~ 6.0 kgf.m, 28.9 ~ 43.4 lb-ft)

  
• When installing, replace with new gaskets.
5. Install in the revers order of removal.
Center Muffler
1. Detach the rubber hanger (A) from the center muffler.
2. Remove the catalytic converter & center muffler (B).

  
• When installing, replace with new gaskets.
3. Install in the revers order of removal.
Main Muffler
1. Detach the rubber hangers (A) from the main muffler.
2. Remove the main muffler (B).

  
• When installing, replace with new gaskets.
3. Install in the revers order of removal.
Replacement procedure of center muffler using clamp

Under warranty : Replace the center muffler assembly.

Out of warranty : It is available to replace the center muffler as the procedure below.
1. Check that the clamping part of the center muffler assembly is damaged or deformed.

If the muffler is too corroded to clamp, replace the center muffler assembly.
2. Record the gap (A, B, C, D, E, F) between the tail pipe (or tail trim) and the rear bumper.

[Pipe type]

[Trim type]

[Bumper-integrated trim type]
3. Remove the catalytic converter & center muffler (A).
4. Cut the center muffler as the instruction below.

[With dent]

A. Cut the front dent of the muffler.

[Without dent]
A. Cut the muffler by reffering to the front dent of A/S muffler as shown in the image below.

[A/S muffler]
A. Cut the rear dent of the A/S muffler.

  
• To prevent a leak, remove the rust on the clamping part or the burr on the cutting part.
• Cut the pipe vertically.
  
• Pipe cutter available to cut the pipe vertically .
• Use a hacksaw as the procedure below, if a pipe cutter is unavailable.
1. Mark the cutting position to cut the pipe vertically.
2. Cut the pipe along the marking line by using hacksaw.
5. Install the center muffler.
(1) Install the catalytic converter (A) and the center muffler (B) for A/S by tightening the nuts lightly, not completely.

  
• When installing the muffler, replace the gasket with new one.
(2) Put the clamp (A) between the cutting part of each pipe and tighten the clamp lightly, not completely.
(3) Tighten the catalytic converter and the center muffler with specified torque.
Tightening torque :

39.2~58.8 N.m (4.0 ~ 6.0 kgf.m, 28.9~43.4 lb-ft)
(4) Compare the gap between the tail pipe(or tail trim) and the rear bumper with the record measured before removing the center muffler assembly.
  
• If the tail pipe is installed differently compared to the initial position, the bumper might be damaged by the pipe heat or interfere between the tail pipe and the rear bumper.
(5) Do not tighten the clamp at a time. Tighten the clamp nuts to the specified torque, by turns.
Tightening torque :

17.6~23.5 N.m (1.8 ~ 2.4 kgf.m, 13.0~17.4lb-ft)

  
• Do not reuse the clamp that was tightened completely. It may cause leak to reuse the clamp that was tightened completely.
Lubrication System
Components and Components Location Components 1. Timing chain cover 2. Outer roter 3. Inner roter 4. Oil pump cover 5. Relief plunger 6. Relief spring 7. ...