Genuine Volkswagen Jetta Variable Timing Solenoid

Volkswagen Jetta Variable Timing Solenoid Parts and Q&A

• Valve
  03L-906-455-C
  Q: How to replace the Variable Timing Solenoid on Volkswagen Jetta?

  A:

  With regards to 1.4L engines, the variable camshaft adjustment solenoids are mounted on the valve cover by the cam cover. Start by taking off the engine cover and then unelectrical connector of the camshaft adjustment solenoid valve. Then unscrew the mounting bolt of the solenoid valve and remove it out of the valve cover and dispose of the O-ring. Installation is also in the opposite direction, with a new O-ring. The solenoid of variable camshaft adjustment is located at the front of the upper timing chain cover in engines with a 1.8 liter and 2.0 liter turbocharged engines (with the exception of two solenoids in some models). Begin by lifting the engine cover followed by unconnecting the electrical connector linking the camshaft adjustment valve. Take out the retaining fasteners, the valve and the seal making sure to replace the adjustment valve seal and O-ring. Disassemble the electrical connector with the camshaft adjustment valve and loosen the mounting fasteners of the valve and detach the valve itself off the upper timing chain cover, including the O-ring. Installation is the opposite of removal and lubrication of the new O-ring with engine oil is taken. Removing the engine cover and the electrical connector of the camshaft adjustment solenoid valve are to be done in 2.5L engines. Take off the mounting fastener of solenoid valve and rip the O-ring off of the cylinder head. Here the process of installing is once again the opposite of de-installing with a new O-ring.
• Solenoid Valve
  04L-906-423
  Q: What role does the Variable Timing Solenoid play in preventing engine damage during timing system adjustments on Volkswagen Jetta?

  A:

  It is also important to proceed with great caution because the timing system is a complex one and an error might result in a serious engine damage and this process should be performed only by people with great experience and a professional should be advised in case of any doubts. One must make sure that they recheck all the work before engine starts. In case of removing the battery, a number of systems will have to be re-teamed to be functional. The valve timing should be reset each time the sprockes of the camshaft are slackened or taken off. Firstly, start with the negative battery cable, unscrew the right front wheel bolts, lift the vehicle with jackstands, and cordon off the other wheels. Take out the right front wheel. Then take off splash shield under the vehicle, engine cover, right front inner fender liner and the Valve Cover and loosen the locking bolt at the engine. Turn the crankshaft clockwise to ensure that the hole in the machined crankshaft is 90-percent exposed by the locking bolt hole, by using a mirror to check. Ensure that the thread holes of the camshaft are aligned with the holes in the guide frame with the engine at TDC, cylinder no. 5; fail which turn the crankshaft one complete full step and recheck. Put the locking pin into the cylinder block and screw it until it fits in very well to ensure that it is on time. Provided the camshafts are close, but not perfectly aligned, place the camshaft holding tool, aligning the fasteners until they sit flat on the camshaft, and adjust accordingly. Where the tool cannot be installed easily, there is need to adjust the timing. Take off the cover of the upper Timing Chain, with the engine held in the timing check position, take off the crankshaft locking pin and turn the crankshaft a little to the no. 5 cylinder TDC position. Install the camshaft holding tool and make sure that the crankshaft is in the TDC position to avoid damaging the valves. Tension the chain of the timing compressor and screw the compression chain with a pin, then cut the exhausting and intake camshaft sprockey retaining screw, and leave the sprockey to turn freely. Install the sprockets again hand tightening the new retaining fasteners taking care of the timing chain. Unscrew the tensioner piston and leave the exhaust sprocker fitted with a pin sprocket wrench. Using a helper, rotate and hold the exhaust sprocket with tightening of the intake camshaft adjuster sprocket fastener, then the exhaust camshaft sprocket one, and then torque to the required value. Take off the camshaft holding tool and crankshaft locking pin, twist the engine to make sure that the timing is correct with your hand and rinse the adjustment procedure again. Prior to the initiation of the engine, ensure that the crankshaft has turned at least two full revolutions by hand, looking after any resistance that could be a symptom of an issue like valve contact with the pistons. Make sure everything is in place before you start the engine and label all the installation in the order in which everything was removed.