Cylinder and Camshaft Inspection SOHC
Tools Required
SA9179NE Dial Indicator
Inspection Procedure
- Install camshaft and bearing caps. Refer to Cylinder Head Assembly procedure
for additional detail.
1.1. | Oil camshaft journals and install camshaft. Install the bearing caps with
arrows on caps pointed toward camshaft sprockets, front of cylinder head. |
| Important: Bolt threads should be lightly oiled prior to installation. Holes must be clean
and free from oil and debris.
|
1.2. | Bolts must be pulled down uniformly. |
Tighten
Tighten camshaft bearing cap-to-head (LL0) to 14 N·m (10 lb in)
1.3. | Camshaft should rotate freely. If the camshaft binds, check for burrs
in the cylinder head and caps journals. |
- Measure the camshaft thrust, end play. Using a SA9179NE
or equivalent, measure the thrust clearance while moving each camshaft
back and forth. If clearance is greater than maximum, replace the cylinder head or
camshaft.
Camshaft Thrust Clearance
• | Standard: 0.006-0.396 mm (0.0002-0.0156 in) |
• | Service Limit: 0.45 mm (0.018 in) max |
- Remove the camshafts from the cylinder head:
3.1. | Remove the bearing caps. |
3.2. | Remove each camshaft. |
- Inspect camshaft bore for flatness. Using a precision straight edge and feeler
gauge, measure the surfaces contacting the camshaft for warpage. If warpage is greater
than maximum, replace the cylinder head.
Maximum Warpage
• | Standard: 0.05 mm (0.0020 in) max |
• | Service Limit: 0.075 mm (0.003 in) max |
- Inspect camshaft:
- Place the camshaft ends in V-blocks and, using a dial indicator or service
tool SA9179NE
or equivalent, measure the
total runout at the center journal. If the runout is greater than maximum, replace
the camshaft.
Circle Total Runout
• | Standard: 0.080 mm (0.003 in) max |
• | Service Limit: 0.120 mm (0.0047 in) max |
- Using a dial indicator, measure the cam lobe lift rise. Place the camshaft in
V-blocks located next to the lobe being measured.
- If the cam lobe lift/rise is less than minimum, replace the camshaft.
Cam Lobe Lift Rise
• | Standard: 5.183-5.263 mm (0.2042-0.2074 in) max |
• | Service Limit: 5.133 mm (0.203 in) max |
- Using a micrometer, measure the journal diameter.
Journal Diameter
• | Standard: 26.950-26.970 mm (1.0638-1.0648 in) max |
• | Service Limit: 26.925 mm (1.0608 in) max |
- Using an inside micrometer or SA91102NE
or equivalent, measure the housing bore diameter.
Bore Diameter
• | Standard: 44.475-44.500 mm (1.751-1.752 in) max |
• | Service Limit: 44.513 mm (1.753 in) max |
- Subtract the journal diameter measurement from the housing bore diameter
measurement. If the clearance is greater than maximum, replace the camshaft and/or
cylinder head.
Oil Clearance
• | Standard: 0.51-1.101 mm (0.0020-0.0040 in) max |
• | Service Limit: 0.138 mm (0.0054 in) max |
- Inspect camshaft bore for flatness. Using a precision SA9177NE
and SA91101NE
, measure the surfaces contacting the camshaft for warpage. If warpage
is greater than maximum, replace the cylinder head.
Maximum Warpage
• | Standard: 0.05 mm (0.0020 in) max |
• | Service Limit: 0.064 mm (0.0025 in) max |
Cylinder and Camshaft Inspection DOHC
Tools Required
SA9179NE Dial Indicator
Inspection Procedure
- Install the camshaft and bearing caps. Refer to
Cylinder Head Assemble
for additional detail.
1.1. | Oil the camshaft journals and install the camshaft. Install the bearing
caps with the arrows on the caps pointed toward the camshaft sprockets, front of
the cylinder head. |
| Important: Bolt threads should be lightly oiled prior
to installation. The holes must be clean and free from oil and debris.
|
1.2. | The bolts must be pulled down uniformly. |
Tighten
Tighten camshaft bearing cap-to-head (LL0) to 14 N·m (10 lb in).
1.3. | The camshaft should rotate freely. If the camshaft binds, check for burrs
in the cylinder head and caps journals. |
- Measure the camshaft thrust, or end play. Using a
SA9179NE
or equivalent, measure the thrust
clearance while moving each camshaft back and forth. If clearance is greater than
maximum, replace the cylinder head or camshaft.
Specifications
Thrust Clearance
• | Standard: 0.005-0.2 mm (0.002-0.008 in) |
• | Service Limit: 0.25 mm (0.01 in) max. |
- Remove the camshafts from the cylinder head:
3.1. | Remove the bearing caps. |
3.2. | Remove each camshaft. |
- Inspect the camshaft bore for flatness. Using a precision
straight edge and feeler gage, measure the surfaces contacting the camshaft for warpage.
If warpage is greater than the maximum, replace the cylinder head.
Specifications
Maximum Warpage
• | Standard: 0.05 mm (0.002 in) max. |
• | Service Limit: 0.075 mm (0.003 in) max. |
- Inspect the camshaft:
- Place the camshaft ends in V-blocks and, using a SA9179NE
, or equivalent, measure the total runout at the center journal.
If the runout is greater than maximum, replace the camshaft.
Specifications
Circle Total Runout
• | Standard: 0.05 mm (0.002 in) max. |
• | Service Limit: 0.1 mm (0.004 in) max. |
- Using a dial indicator, measure the cam lobe lift/rise.
Place the camshaft in V-blocks located next to the lobe being measured.
- If the cam lobe lift/rise is less than minimum, replace
the camshaft.
Specifications
Cam Lobe Lift Rise
• | Intake Standard: 8.96-9.04 mm (0.3528-0.3559 in) max. |
• | Intake Service Limit: 8.91 mm (0.351 in) max. |
• | Exhaust Standard: 8.66-8.74 mm (0.3409-0.3441 in)
max. |
• | Exhaust Service Limit: 8.61 mm (0.339 in) max. |
- Using a micrometer, measure the journal diameter.
Specifications
Journal Diameter
• | Standard: 28.95-28.97 mm (1.1398-1.1406 in) |
• | Service Limit: 28.925 mm (1.139 in) min. |
- Install the camshaft bearing caps. Using an inside
micrometer, measure the housing bore diameter.
Specifications
Bore Diameter
• | Standard: 29-29.026 mm (1.141-1.142 in) |
• | Service Limit: 29.05 mm (1.144 in) max. |
Important: Plastigage®, or equivalent can be used
to measure the bearing clearance.
- Subtract the journal diameter measurement from the housing bore diameter measurement.
If the clearance is greater than the maximum, replace the camshaft and/or cylinder
head.
Specifications
Oil Clearance
• | Standard: 0.03-0.076 mm (0.0012-0.003 in) |
• | Service Limit: 0.125 mm (0.005 in) max. |