Daewoo ST Series Betriebsanleitung PDF herunterladen (Seite 70)

•

For removal of the valve seat, apply

arc welding work to two points of valve

seat insert, and pull out the valve seat

insert with inner extractor.

•

For assembling of a new valve seat, by putting it among the dry ices of an ice box previously

for about 2 hours for the cold shrinkage, and press it in the cylinder head by a special tool.

(bench press)

•

Apply the valve lapping compound on the valve head seating face and lap the valve seat by

turning it until it is seated in its position, then wipe out the lapping compound.

Note : Clean the valve and cylinder head with light oil or equivalent after the valve seat

finishing is completed, and make sure that there are no grinding materials remained.

4) Valve spring

•

Visual check

Visually check the exterior of the valve

springs for damage, and replace if

necessary.

•

Valve Spring Free Length

Use a vernier caliper to measure the

valvespring free length.

If the measured value is less than the

specified limit, the valve spring must

be replaced.

- 67 -

EA3M2032

Valve seat

insert

Welding bead

Cylinder head

EJM2049I

Spring free Length Standard

Intake valve 64 mm

Exhaust Inner 60 mm

valve Outer 71 mm

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Daewoo ST Series Betriebsanleitung Seite 70