Reassembling Cylinder Head And Valve Mechanism; Cleaning Cylinder Head Bottom Surface; Installing Valve Stem Seal; Installing Valve Spring - Mitsubishi Heavy Industries SL Series Service Manual

3. Reassembling cylinder head and valve mechanism

Reassemble the cylinder head and valve mechanisms in the reverse order of the disassembly procedures.

3.1 Cleaning cylinder head bottom surface

Taking care not to damage the cylinder head bottom surface,
remove residue of old gasket.
Note: First, roughly scrape off residue of old gasket using a
scraper. Then, grind off the remaining residue using
an engine-oil immersed oil stone.

3.2 Installing valve stem seal

Do not apply oil or liquid gasket to the inner side of
stem seal that comes in contact with the valve guide.
(1) Apply engine oil to the lip of the valve stem seal.
(2) Push the shoulder of the valve stem seal and fit the
valve stem steal into the valve guide.
(3) Make sure the valve stem steal is fully inserted into the
valve guide.

3.3 Installing valve spring

Install the valve spring with its white or yellow enamel
painted side facing upward.

3.4 Installing valve lock

If valve spring is overcompressed, the lower end of the
retainer comes into contact with the stem seal, and
causes damage to the stem seal.
Install the retainer on the valve spring.
Compress the valve spring using a valve lifter, and install
the valve locks.
REASSEMBLY OF BASIC ENGINE
Scraping gasket
Installing valve stem seal
White enamel
coating
Installing valve spring
Installing valve lock
Box wrench No.12
7-13