Cylinder Head Measurement
WARNING: This page is about a different variant/trim than selected.
Deck Flatness Inspection
Ensure the cylinder head decks are clean and free of gasket material.
- Inspect the surface for any imperfections or scratches that could inhibit proper cylinder head gasket sealing.
- Place a straight-edge diagonally across the cylinder head deck face surface.
- Measure the clearance between the straight-edge and the cylinder head deck face using a feeler gauge at 4 points along the straight-edge.
- If the warpage is less than 0.05 mm (0.002 in), the cylinder head deck surface does not require resurfacing.
- If the warpage is between 0.05 - 0.20 mm (0.002 - 0.008 in) or any imperfections or scratches that could inhibit proper cylinder head gasket sealing are present, the cylinder head deck surface requires resurfacing.
- If resurfacing is required the maximum amount that can be removed is 0.25 mm (0.010 in).
- If the cylinder head deck surface requires more than 0.25 mm (0.010 in) material removal the head must be replaced.
Valve Guide Measurement
Measure the valve stem (1) -to-guide (2) clearance. Excessive valve stem-to-guide clearance may cause an excessive oil consumption and may also cause a valve to break. Insufficient clearance will result in noisy and sticky functioning of the valve and will disturb the engine assembly smoothness.
- Clamp the GE - 8001 Dial Indicator Set to the cylinder head at the camshaft cover rail.
- Locate the dial indicator so that the movement of the valve stem from side to side, crossways to the cylinder head, will cause a direct movement of the indicator stem. The dial indicator stem must contact the side of the valve stem just above the valve guide.
- Drop the valve head about 0.064 mm (0.0025 in) off the valve seat.
- Use light pressure when moving the valve stem from side to side in order to obtain a clearance reading. Engine Mechanical Specifications
- If the clearance for the valve is greater than specifications and a new standard diameter valve stem will not bring the clearance within specifications, the valve guide may be oversized by 0.075 mm (0.003 in) using the EN - 42096 Valve Guide Reamer. There is 1 size of oversized valve stem available for service.
- Valve guide wear at the bottom 10 mm (0.390 in) of the valve guide is not significant to normal operation.
- If oversizing the guide does not bring the clearance within specifications, replace the cylinder head.
Plug Inspection