Cam Clearance: Adjustment

WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Remove the engine from the vehicle. < Refer to REMOVAL , Engine Assembly. >
Remove the chain cover. < Refer to REMOVAL , Chain Cover. >

When adjusting #1 and #3 cylinders

Remove the timing chain RH. < Refer to TIMING CHAIN RH , REMOVAL, Timing Chain Assembly. >
Remove the cam carrier RH. < Refer to CAM CARRIER RH , REMOVAL, Cam Carrier. >
Measure the thickness of valve shim using micrometer.
NOTE: Measurement should be performed at a temperature of 20°C (68°F).

Fig 1: Measuring Thickness Of Valve Shim Using Micrometer
Courtesy of SUBARU OF AMERICA, INC.

Select a valve shim of suitable thickness using the measured cam clearance and valve shim thickness.

NOTE: Use a new valve shim.

Intake side: S = T+1.54 x (V-0.13 mm (0.0051 in))
Exhaust side: S = T+1.69 x (V-0.24 mm (0.0094 in))

S: Valve shim thickness required
V: Measured cam clearance
T: Current valve shim thickness

Install the cam carrier RH. < Refer to CAM CARRIER RH , INSTALLATION, Cam Carrier. >
Check all the cam clearance of RH side at this time. If the cam clearance is not within the standard value, repeat the procedure over again from step 2).
NOTE: When the removing/installing of cam carrier RH has been performed, cam clearance may be outside the standard value. Checking of all cam clearance of RH side is necessary. Refer to INSPECTION of "Cam Clearance" for the cam clearance inspection. < Refer to WHEN TIMING CHAIN ASSEMBLY IS REMOVED , INSPECTION, Cam Clearance. >

Cam clearance:

Intake

Standard

0.13±0.03 mm (0.0051±0.0012 in)

Exhaust

Standard

0.24±0.03 mm (0.0094±0.0012 in)

When adjusting #2 and #4 cylinders

Remove the timing chain LH. < Refer to TIMING CHAIN LH , REMOVAL, Timing Chain Assembly. >
Remove the cam carrier LH. < Refer to CAM CARRIER LH , REMOVAL, Cam Carrier. >
Measure the thickness of valve shim using micrometer.
NOTE: Measurement should be performed at a temperature of 20°C (68°F).

Fig 2: Measuring Thickness Of Valve Shim Using Micrometer
Courtesy of SUBARU OF AMERICA, INC.

Select a valve shim of suitable thickness using the measured cam clearance and valve shim thickness.

NOTE: Use a new valve shim.

Intake side: S = T+1.54 x (V-0.13 mm (0.0051 in))
Exhaust side: S = T+1.69 x (V-0.24 mm (0.0094 in))

S: Valve shim thickness required
V: Measured cam clearance
T: Current valve shim thickness

Install the cam carrier LH. < Refer to CAM CARRIER LH , INSTALLATION, Cam Carrier. >
Check all the cam clearance of LH side at this time. If the cam clearance is not within the standard value, repeat the procedure over again from step 2).
NOTE: When the removing/installing of cam carrier LH has been performed, cam clearance may be outside the standard value. Checking of all cam clearance of LH side is necessary. Refer to INSPECTION of "Cam Clearance" for the cam clearance inspection. < Refer to WHEN TIMING CHAIN ASSEMBLY IS REMOVED , INSPECTION, Cam Clearance. >

Cam clearance:

Intake

Standard

0.13±0.03 mm (0.0051±0.0012 in)

Exhaust

Standard

0.24±0.03 mm (0.0094±0.0012 in)

After adjustment, install the related parts in the reverse order of removal.