Checking the cylinder head

1. Eliminate:

• Combustion chamber carbon deposits (with a rounded scraper)

NOTE:

Do not use a sharp instrument to avoid damaging or scratching:

• Spark plug bore threads
• Valve seats

2. Check:

• Cylinder head Damage/scratches Replace.


• Cylinder head water jacket Mineral deposits/rust
  Eliminate.

3. Measure:

• Cylinder head warpage Out of specification Resurface
  the cylinder head.

a. Place a straightedge "1" and a thickness gauge "2" across the cylinder head.

b. Measure the warpage.

c. If the limit is exceeded, resurface the cylinder head as follows.

d. Place a 400-600 grit wet sandpaper on the surface plate and resurface the cylinder head using a figure-eight sanding pattern.

NOTE:

To ensure an even surface, rotate the cylinder head several times.