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REPAIR MAINTENANCE OPERATION OF MOTOR VEHICLES
Volkswagen Touareg (from 2003 to 2006, the year of issue)

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Volkswagen Touareg
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Volkswagen
Touareg
Operation and maintenance of car
Engine
Preliminary checks on the car
The mechanical part (petrol engines 3,2L)
Removal of the power unit
Removal and installation of the left and right engine support cushions
Removing and installing drive plate
Removing and installing oil seal on the flywheel side
Replacing the oil seal on the side of the crankshaft vibration damper
Replacement of sealing flange on the side of the crankshaft vibration damper
Removing and installing crankshaft
Removing and installing the side cover
Removing and installing cylinder head cover
Removal and installation of the cylinder head
Checking the valve timing
The timing
Removing camshafts
Installing the camshaft
Checking the axial displacement of the camshaft
Marking camshafts
Replacing valve stem seals
Checking the valve guides
Processing valve seat
Valve sizes
Checking the pistons, piston rings and cylinder bore
The mechanical part (petrol engines 4,2L)
The mechanical part (diesel engines 5,0L)
Removing and installing subframe
Pressurization system (diesel engines)
Cooling system (petrol engines)
The cooling system (diesel engines)
Lubrication (petrol engines)
Lubrication system (diesel engines)
Injection System (petrol engines)
Fuel injection system (diesel engines)
Exhaust
FUEL (beninovye engines)
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Chassis
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Onboard electric
Body
diagrams
 


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Processing valve seat



NOTE
When repairing engines with leaky valves treat or replace the valve seats and valve insufficiency. Particularly in engines with long service life, check the valve guides for wear.

Valve seats should doobrabatyvat just enough to achieve the kind of perfect work surface. Before treatment should risschitat maximum allowance for processing. If you exceed the allowance for processing may be impaired function of the hydraulic control valve clearance (lash), which would entail the replacement of the cylinder head.
Remove the camshafts.
Calculate maximum allowance for processing as follows:
- Insert the valve into the guide and press it firmly to the saddle;

NOTE
If the valve is replaced during repair, then the measurements should use a new valve.


A distance between the end of the valve stem and the upper edge of the cylinder head
Fig. 2.85. A distance between the end of the valve stem and the upper edge of the cylinder head


- Measure the distance A between the end of the valve stem and upper edge of the cylinder head (Fig. 2.85);
- Calculate the maximum allowance for processing on the basis of the measured distance A and the minimum size.

Minimum dimensions

Measured the distance A minus the minimum size = max. allowable size refinement.
Example:
Measured distance 10.6 mm .....
The minimum size of 10.2 mm .....
The maximum allowable allowance for processing ..... 10,6-10,2 = 0,4 mm

NOTE
The following diagrams the maximum allowance for processing valve seats depicted as size B.

Processing inlet valve seat

The processing circuit inlet valve seat
Fig. 2.86. The processing circuit inlet valve seat



a - ZH30,6 mm
b - the maximum size of finishing
c - 0,9-1,5 mm
d - max. ZH35,0 mm
r2 - radius of 2.0 mm
Z - lower edge of the cylinder head
a - 45 ?� chamfer angle of the valve seat
b - 30 ?� angle correction chamfer the top
g - 60 ?� lower correction angle chamfers

Processing saddle valve

The processing circuit of the exhaust valve seat
Fig. 2.87. The processing circuit of the exhaust valve seat



a - ZH26 mm
b - the maximum size of finishing
c - 1.2-1.7 mm
d - max. ZH29,0 mm
r2 - radius of 2.0 mm
Z - lower edge of the cylinder head
a - 45 ?� chamfer angle of the valve seat
b - 30 ?� angle correction chamfer the top
g - 60 ?� lower correction angle chamfers




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Checking the valve guides
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Valve sizes

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