VW Golf manuals

Volkswagen Golf Service & Repair Manual: Checking valve timing, engine codes CHPA, CMBA, CPVA, CXSA, CZCA, CPVB, CZDA

Special tools and workshop equipment required
   
Torque wrench -VAS 6583-
 

Checking valve timing, engine codes CHPA, CMBA, CPVA, CXSA, CZCA, CPVB, CZDA

Locking pin -T10340-
 

Checking valve timing, engine codes CHPA, CMBA, CPVA, CXSA, CZCA, CPVB, CZDA

Camshaft clamp -T10494-
Assembly tool -T10487-
Release tool -T10527-
Release tool -T10527/1-
Procedure
 

Checking valve timing, engine codes CHPA, CMBA, CPVA, CXSA, CZCA, CPVB, CZDA

–  Loosen hose clips -1, 2- and remove air pipe.
–  Move air hoses clear at air pipe.
–  Detach connector from charge pressure sender -GX26-.
 

Checking valve timing, engine codes CHPA, CMBA, CPVA, CXSA, CZCA, CPVB, CZDA

–  Release fasteners -arrows- using release tools -T10527- and -T10527/1-.
–  Remove air pipe -1-.
 

Checking valve timing, engine codes CHPA, CMBA, CPVA, CXSA, CZCA, CPVB, CZDA

–  Press release tabs and disconnect hose -1- for activated charcoal filter.
–  Remove bolts -arrows- and detach crankcase breather hose.
–  Remove noise insulation → General body repairs, exterior; Rep. gr.66.
–  Drain coolant → Chapter.
 

Checking valve timing, engine codes CHPA, CMBA, CPVA, CXSA, CZCA, CPVB, CZDA

–  Unscrew bolts -A ... D-, and push cover -1- for thermostat to one side.
 

Checking valve timing, engine codes CHPA, CMBA, CPVA, CXSA, CZCA, CPVB, CZDA

–  Lay wiring harness to one side -arrows-.
–  Unscrew bolts -1, 3- and remove cover -2- for toothed belt for coolant pump.
 

Checking valve timing, engine codes CHPA, CMBA, CPVA, CXSA, CZCA, CPVB, CZDA

–  Unscrew bolts -arrows- and detach sealing cap -1-.
Rotate crankshaft to “TDC” as follows:
–  Remove ignition coil 1 with output stage -N70- and cylinder 1 spark plug → Chapter.
–  Insert a screwdriver with a shaft length of at least 250 mm into spark plug hole so that it contact piston crown.
–  Turn the crankshaft in the normal direction of rotation until the piston in cylinder 1 shows “BDC”.
 

Checking valve timing, engine codes CHPA, CMBA, CPVA, CXSA, CZCA, CPVB, CZDA

The screwdriver moves in the -direction of the arrow-.
 

Checking valve timing, engine codes CHPA, CMBA, CPVA, CXSA, CZCA, CPVB, CZDA

–  Turn the crankshaft further, until the screwdriver has moved -30 mm- in the -direction of the arrows-
 

Checking valve timing, engine codes CHPA, CMBA, CPVA, CXSA, CZCA, CPVB, CZDA

–  Unscrew plug for “TDC” hole in cylinder block.
–  Screw locking pin -T10340- into cylinder block as far as stop and tighten to 30 Nm.
–  Rotate crankshaft in normal direction of rotation as far as stop.
The locking pin now rests against the crank web.
  Note
Locking pin -T10340- locks crankshaft in direction of engine rotation only.
Risk of damage to engine
If locking pin -T10340- cannot be screwed in as far as stop, this indicates that crankshaft is not in the correct position!
In this case, proceed as follows:
Unscrew locking pin.
Turn crankshaft 90° in direction of engine rotation.
Screw locking pin -T10340- into cylinder block as far as stop and tighten to 30 Nm.
Turn crankshaft in direction of engine rotation as far as stop.
The asymmetrically positioned grooves on gearbox end of both camshafts -arrows, upper figure- must be above the horizontal centre line, as shown in figure.
 

Checking valve timing, engine codes CHPA, CMBA, CPVA, CXSA, CZCA, CPVB, CZDA

The grooves on the exhaust camshaft -upper arrows- can be accessed through the recesses in toothed belt pulley for coolant pump.
On the inlet camshaft the grooves -lower arrows- must also be positioned right above horizontal camshaft centre line.
A -  Exhaust camshaft
E -  Inlet camshaft
–  If camshafts are not positioned as described, unscrew locking pin -T10340-, turn crankshaft one rotation further and return to “TDC” position.
  Note
The camshaft clamp -T10494- must slide into position easily.
Do not knock camshaft clamp into place with any kind of tool.
If the camshaft clamp -T10494- does not easily slide into position:
 

Checking valve timing, engine codes CHPA, CMBA, CPVA, CXSA, CZCA, CPVB, CZDA

–  Use assembly tool -T10487- to push against toothed belt in -direction of arrow-.
 

Checking valve timing, engine codes CHPA, CMBA, CPVA, CXSA, CZCA, CPVB, CZDA

–  Insert camshaft clamp -T10494- as far as stop into camshaft.
–  Tighten bolt -arrow- by hand.
If camshaft clamp cannot be fitted:
–  Adjust valve timing: removing toothed belt from camshafts → Chapter.
If camshaft clamp can be fitted:
–  Valve timing is OK.
Risk of damage to engine
After completing work, check that locking pin -T10340- and camshaft clamp -T10494- have been removed.
Further assembly is carried out in the reverse order of removal.
  Note
Renew bolts that are tightened with specified tightening angle.
Renew O-ring of plug if damaged.
Specified torques
→ Chapter „Assembly overview - toothed belt“
→ Fig. „“Plug for TDC drilling in cylinder block - specified torque”“
→ Chapter „Assembly overview - camshaft housing, engine codes CHPA, CMBA, CPVA, CXSA, CZCA, CPVB, CZDA“
→ Chapter „Assembly overview - crankcase breather system“
→ Chapter „Assembly overview - coolant pump, thermostat“
→ Chapter „Assembly overview - charge air system“
 

Checking valve timing, engine codes CHPA, CMBA, CPVA, CXSA, CZCA, CPVB, CZDA

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