Home Up Getting Started Cooling System Air Intake System Auto Tranny Eng Support Eng Damper Instrument Cluster Cruise Control Speed Sensor Timing Belt

                                  EJ22 Timing Belt Replacement

 

   
The manuals and documentation available for replacing the timing belt can be quite confusing. The reason is that Subaru have identified two different sets of timing information on the crank and cam gears. The marks are closely related but must not be mixed up. I will try to clarify below.

 

 

   
This picture shows the crank gear, on the left, at top dead centre (TDC) on cylinder #1 - the small arrow on the face of the gear is pointing to the small mark in the case. On the right, the cam gear is in its correct position for TDC, with the arrow on the web pointing to the mark in the plastic cover.

 

   
   
     
In this picture you can see all three gears in their correct TDC position. However, it is very difficult to keep the cam gear on the right in this position - as soon as you let go of it it wants to rotate to a more stable position. For this reason Subaru selected a different position for setting up the timing belt. What they did was rotate the crank 90 degrees clockwise - which moves the cam gears 45 degrees clockwise. In this position all of the gears can be moved quite easily but will stay put while you fit the new timing belt. The next pictures show this timing belt installation positions.

 

   
Here the valve timing marks are in the correct position for installing a new belt - note that the crank is rotated 90 degrees and the cam gear is rotated 45 degrees from the TDC position.

 

   

 

   
Here is a close up shot of the crank gear on TDC and the timing mark 90 degrees anticlockwise.

 

   

 

   
In this picture you can see the timing mark on the small crank sensor cog - lined up with the mark in the case and the cam gear notch in the face of the gear is lined up with the notch in the plastic cover. All makes sense - but can be very confusing the first time. Even though the crank shaft makes two revolutions for every turn of the cam shafts if these marks are lined up as shown the valve timing will be correct.

 

   
   
 

When you have the timing belt all set up - this is your final check before pulling the pin out of the timing belt tensioner - 44 teeth on the left and 40.5 on the right.

   
     
 NOTE: Use these ideas at you own risk - no warranty or guarantee implied or included.  Tom    
     
Home Up Getting Started Cooling System Air Intake System Auto Tranny Eng Support Eng Damper Instrument Cluster Cruise Control Speed Sensor Timing Belt