Polaris Trail Blazer Service Manual page 208

Engine Disassembly, Cont.
4. Measure free length of spring with a Vernier caliper.
Check spring for squareness.
specifications on page 3.5 - 3.8. Replace spring if
either measurement is out of specification.
5. Remove valve seals. CAUTION: Replace seals
whenever the cylinder head is disassembled.
Hardened, cracked or worn valve seals will cause
excessive oil consumption and carbon buildup.
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Compare to
3.63
ENGINE
ES33PF, EH50PL Engine
Valve Spring
Free Length
Coil Fatigue/
Squareness
4/99