Cam Carrier: Inspection

Visually check the cam carrier filter, and if clogging is found, replace with a new part.

Fig 1: Locating Cam Carrier Filter
Courtesy of SUBARU OF AMERICA, INC.
Check the camshaft journals for damage and wear. Replace the camshaft if faulty.
Check the cam face condition of camshaft, and remove the minor faults by grinding with oil stone. Replace the camshaft if uneven wear is found.
Using a dial gauge, check the camshaft bend. If it exceeds the limit, replace the camshaft.
NOTE: Measurement should be performed at a temperature of 20°C (68°F).

Camshaft bend:

Limit

0.020 mm (0.00079 in)

Fig 2: Measuring Camshaft Bending Using Dial Gauge
Courtesy of SUBARU OF AMERICA, INC.
Check the cam lobe height "H" and cam base circle diameter "A" of camshaft as shown in the figure, using micrometer. If it is not within the standard, replace the camshaft.
NOTE: Measurement should be performed at a temperature of 20°C (68°F).

Camshaft cam lobe overall height H:

Intake

Standard

40.77 - 40.87 mm (1.605 - 1.609 in)

Exhaust

Standard

40.15 - 40.25 mm (1.581 - 1.585 in)

Camshaft cam base circle diameter A:

Standard

34.0 mm (1.339 in)

Fig 3: Identifying Camshaft Cam Lobe Overall Height And Base Circle Diameter
Courtesy of SUBARU OF AMERICA, INC.
Check the camshaft journal outer diameter using micrometer. If it is not within the standard, replace the camshaft.
NOTE:
- Measurement should be performed at a temperature of 20°C (68°F).
- Measure outer diameter of each journal at several points, and read the value of most worn location.
Camshaft journal outer diameter:

Standard

25.946 - 25.963 mm (1.0215 - 1.0222 in)

Fig 4: Measuring Camshaft Journal Outer Diameter Using Micrometer
Courtesy of SUBARU OF AMERICA, INC.
Using a dial gauge, check the thrust clearance of the camshaft. If it is not within the standard or if uneven wear is found, replace each camshaft cap and cam carrier as a set. If necessary replace the camshaft.
NOTE:
- Measurement should be performed at a temperature of 20°C (68°F).
- Set the dial gauge at end surface of camshaft.
Camshaft thrust clearance:

Standard

0.068 - 0.116 mm (0.0027 - 0.0047 in)

Fig 5: Measuring Camshaft Thrust Clearance Using Dial Gauge
Courtesy of SUBARU OF AMERICA, INC.
Check the oil clearance on the camshaft using a plastigauge.
NOTE: Measurement should be performed at a temperature of 20°C (68°F).
1. Remove the liquid gasket from cam carrier and front camshaft cap, intake rear camshaft cap and exhaust rear camshaft cap.
2. Clean each camshaft cap and cam carrier journals.
3. Set the camshaft to the cam carrier.
4. Place a plastigauge across the camshaft journals of each camshaft and set the camshaft caps.
5. Tighten the bolts which secure front camshaft cap, intake center camshaft cap, intake rear camshaft cap, exhaust center camshaft cap and exhaust rear camshaft cap in numerical order as shown in the figure.
  Tightening torque:
  
  18 N.m (1.8 kgf-m, 13.3 ft-lb)
  
  Fig 6: Identifying Tightening Sequence Of Camshaft Cap Mounting Bolts
  Courtesy of SUBARU OF AMERICA, INC.
6. Loosen the bolts (front camshaft cap, intake center camshaft cap, intake rear camshaft cap, exhaust center camshaft cap and exhaust rear camshaft cap) equally, a little at a time in numerical sequence as shown in the figure, and remove each camshaft cap.
  
  Fig 7: Identifying Loosening Sequence Of Camshaft Cap Mounting Bolts
  Courtesy of SUBARU OF AMERICA, INC.
7. Determine camshaft oil clearance by matching the widest point of plastigauge on each journal against scale printed on a package of plastigauge. If it is not within the standard, replace each camshaft cap and cam carrier as a set. If necessary replace the camshaft.
  Camshaft oil clearance:
  
  Standard
  
  0.037 - 0.072 mm (0.0015 - 0.0028 in)
  
  Fig 8: Measuring Camshaft Oil Clearance Using Plastigauge
  Courtesy of SUBARU OF AMERICA, INC.
8. Completely remove the plastigauge.