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Home >> Volkswagen >> 2015 >> Jetta Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 201 (2.0L - Engine Mechanical (Cylinder Head, VALVETRAIN) - Engine Code(S): CBPA & CKJA (Sedan)) >> 15 Cylinder Head, VALVETRAIN >> VALVETRAIN >> Valve Seats, Reworking

Valve Seats, Reworking

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Special tools and workshop equipment required 

Perform the Following 

NOTE:

When repairing engines with leaking valves, it is not sufficient to rework or replace valve seats and valves. It is particularly important to check valve guides for wear on engines with longer running times.

Only reface valve seats enough until a perfect contact pattern is obtained. The maximum permissible reworking dimension must be calculated before work is carried out. If the reworking dimension is exceeded, the function of the hydraulic lifters can no longer be guaranteed. Therefore the cylinder head should be replaced.

Calculate Maximum Reworking Dimension

-- Insert valve and press firmly against seat.

NOTE:

If the valve is to be replaced as part of a repair, use a new valve for the calculation.

-- Measure distance -a- between end of valve stem and upper edge of cylinder head.

Fig 1: Identifying Distance Between End Of Valve Stem And Upper Edge Of Cylinder Head
GWWV15-0640Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Calculate maximum permissible reworking dimension from measured distance -a- and minimum dimension.

Minimum dimensions

Intake valve: 33.8 mm

Exhaust valve: 34.1 mm

Measured distance -a- minus minimum dimension

= Max. permissible reworking dimension

Example: 

  Measured distance -a- 35.1 mm
- Minimum dimension 34.1 mm
= maximum permissible rework dimension(1) 1.0 mm
(1) Maximum allowable refacing dimension is represented in illustrations for refacing valve seats as dimension "b".

Reworking Intake Valve Seat

Fig 2: Identifying Intake Valve Seat Measurements
GWWV15-0656Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
Dimension Intake Valve Seat
Diameter a mm 39.2
b mm maximum permitted rework dimension
c mm 1.8 to 2.2
Z   Cylinder Head Lower Edge
45°   Valve seat angle
30°   Upper correction angle

Reworking Exhaust Valve Seat

Fig 3: Identifying Exhaust Valve Seat Measurements
GWWV15-0657Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
Dimension Exhaust Valve Seat
Diameter a mm 32.4
b mm maximum permitted rework dimension
c mm 2.2 to 2.6
Z   Cylinder Head Lower Edge
45°   Valve seat angle
30°   Upper correction angle
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