For 1990-2009 cars

#### Tools Required

J 8087 Cylinder Bore Checking Gauge

1. Clean the following areas:

| Notice: Do not use a caustic solution to clean the aluminum engine block.

| Important: When cleaning an engine block in a thermal type oven, do not exceed 232°C (450°F).

• | The engine block in the solvent, remove all sludge, dirt, or debris.

• | Refer to Cleanliness and Care .

| Caution: Wear safety glasses in order to avoid eye damage.

• | Dry the block with compressed air.

• | The gasket surfaces

• | Refer to Replacing Engine Gaskets .

• | The coolant passages

• | The oil galleries

• | The main bearing caps

• | The engine block cylinder head bolt holes for threadlocking material

• | Thread repair driver tool J 42385-107 may be used to clean the threads of old threadlocking material.

2. Inspect the following areas:

• | The cylinder walls for excessive scratches, gouging, or ring ridge

• | The coolant jacket for cracks

• | The valve lifter bores for excessive scoring or wear

• | The crankshaft bearing webs for cracks

• | The gasket sealing surfaces for excessive scratches or gouging

• | Refer to Replacing Engine Gaskets .

• | The oil galleries for restrictions

• | All threaded bolt holes for damage

3. Measure the following areas:

• | The cylinder bores for taper

• | The cylinder bores for excessive ring ridge at the top of the cylinder

### Measuring the Cylinder for Taper, Out-of-Round, and Oversize

1. Adjust the micrometer to 99.0 mm (3.897 in).
2. Insert the bore gauge into the micrometer and zero the bore gauge dial.
3. Use a bore gauge and measure the cylinder bore for taper, out-of-round, and oversize.

Slide the bore gauge up and down throughout the length of the cylinder bore. Check the bore both parallel and perpendicular to the centerline of the crankshaft.

A cylinder bore that measures 99.0-99.018 mm (3.897-3.898 in) may be honed and serviced with a standard size piston.

A cylinder bore that exceeds the maximum diameter must be serviced with an oversized piston.