Section 17 (Engine Mechanical (H4DOTC)): Camshaft: Inspection

WARNING: This page is about a different variant/trim than selected.

Measure the bend, and repair or replace if necessary.
Standard value:

0.020 mm (0.0008 in) or less

Fig 1: Measuring Bend
Courtesy of SUBARU OF AMERICA, INC.
Check the journal for damage and wear. Replace if faulty.

Measure the outside diameter of camshaft journal. If the journal diameter is not within specification, check the oil clearance.

CAMSHAFT SPECIFICATION

	Camshaft journal
	Front	Center, rear
Standard value mm (in)	37.946 - 37.963 (1.4939 - 1.4946)	29.946 - 29.963 (1.1790 - 1.1796)

Measurement of the camshaft journal oil clearance:
1. Clean the bearing caps and camshaft journals.
2. Place the camshafts on cylinder head.
3. Place a plastigauge across each of the camshaft journals.
4. Gradually tighten the cap in at least two stages in alphabetical sequence shown in Fig 2 , and then tighten to the specified torque. Do not turn the camshaft.
  Tightening torque:
  
  T1: 10 N.m (1.0 kgf-m, 7.2 ft-lb)
  
  T2: 20 N.m (2.0 kgf-m, 14.5 ft-lb)
  
  Fig 2: Tightening Cap
  Courtesy of SUBARU OF AMERICA, INC.
5. Remove the bearing caps.
6. Measure the widest point of the plastigauge on each journal. If oil clearance exceeds the limit, replace the camshaft. If necessary, replace the camshaft caps and cylinder head as a set.
  Standard:
  
  0.037 - 0.072 mm (0.0015 - 0.0028 in)
  
  Fig 3: Measuring Widest Point Of Plastigauge On Each Journal
  Courtesy of SUBARU OF AMERICA, INC.
7. Completely remove the plastigauge.
Check the cam face condition, and remove the minor faults by grinding with oil stone. Measure the cam height H. If it exceeds the limit or has partial wear, replace it.
Cam height H:

Standard Intake

46.55 - 46.65 mm (1.833 - 1.837 in)

Exhaust

46.75 - 46.85 mm (1.841 - 1.844 in)

Cam base circle diameter A:

37.0 mm (1.457 in)

Fig 4: Measuring Cam Base Circle Diameter
Courtesy of SUBARU OF AMERICA, INC.
Measure the side clearance of camshaft with dial gauge. If the clearance exceeds the limit or has partial wear, replace the caps and cylinder head as a set. If necessary, replace the camshaft.
Standard:

0.068 - 0.116 mm (0.0027 - 0.0047 in)

Fig 5: Measuring Side Clearance Of Camshaft With Dial Gauge
Courtesy of SUBARU OF AMERICA, INC.