TM-9-2815-205-34

ENGINE WITH CONTAINER; MODELS 5063-5299, 5063-5392, 5063-5393, 5063-5395, 5063-5398, 5063-539F, 5063-539L

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE

AUGUST 1992

TM-9-2815-205-34 - Page 431 of 596

TM 9-2815-205-34

(b)

(c)

Grind throat of valve seat using 60

degree grinding wheel.

Grind top surface of valve seat with

15 degree grinding wheel to narrow

seat width to dimensions shown.

Adjust the 31 degree face (72) relative

to center of valve face (73) using

and 60 degree grinding wheels.

NOT E

(d)

(e)

(f)

(g)

Grinding will reduce thickness

of valve seat and cause valve

to recede into cylinder head.

Replace valve seat if valve

recedes beyond limits.

15

After grinding is completed, clean valve seat thoroughly. Measure concentricity of valve

seat in relation to valve guide. If runout exceeds 0.002 inch (0.05 mm), check for bent or

worn valve guide before-regrinding valve seat.

Apply a light coat of Prussian blue paste to valve seat.

Lower stem of valve in valve guide and bounce valve on seat. Do not rotate valve.

Remove valve and observe area of contact on valve face. Most desirable area of contact is

at center of valve face.

(6) Exhaust valves and springs

(a)

(b)

(c)

Valve stems must be free from

scratches or scuff marks. Valve faces

must be free of ridges, cracks, or

pitting.

Replace valves if warped, excessively

worn, or pitted.

Using spring tester (74), measure

load required to compress valve

spring (30) to 1.93 inches (4.90 cm).

Replace valve spring if load is less

than 25 Ibs.

3-301