POWERHEAD
90-884294 OCTOBER 2001 Page 4A-53
Reed Block Assembly
IMPORTANT: DO NOT remove reeds from reed blocks, unless replacement is neces-
sary. DO NOT turn used reeds over for re-use. Replace reeds in sets only.
1. Thoroughly clean gasket surfaces of reed blocks and reed block housing. Check for
deep grooves, cracks and distortion that could cause leakage. Replace parts as neces-
sary.
2. Inspect reed block neoprene surface for wear, cuts or abraisions. Replace reed block(s)
as required.
3. Check for chipped and broken reeds.
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Allowable reed opening is 0.020 in. (0.51 mm) or less. Replace reeds if either reed is stand-
ing open more than 0.020 in. (0.51 mm).
End Bearing Bleed System
1. Check rubber bleed hoses. Replace any hose that is cracked, cut or deteriorating.
2. Check operation of lower end cap check valve. If valve is working properly, air can be
drawn through check valve “one way” only. If air can pass through a check valve both
ways, valve is not working properly and must be replaced.
Connecting Rods
1. Check connecting rods for alignment by placing rods on a surface plate. If light can be
seen under any portion of machined surfaces, if rod has a slight wobble on plate, or if
a 0.002 in. (0.051 mm) feeler gauge can be inserted between any machined surface and
surface plate, rod is bent and must be discarded.
2. Overheating: Overheating is visible as a bluish bearing surface color that is caused by
inadequate lubrication or excessive RPM.
3. Rust: Rust formation on bearing surfaces causes uneven pitting of surface(s).
a
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a
a-Pitting
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