Engine valve clearance adjusting method

Details Engine valve clearance adjusting method Engine valve clearance adjusting method

2007-12-11

2007-12-11

Chang, Ching (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Tappet

C123S090390, C123S090540

Reexamination Certificate

active

10565416

ABSTRACT:
A technique which allows an unskilled person to simply adjust a tappet clearance in an engine valve sometimes has a problem in that it can inaccurately adjust clearance because the abutment seat of a magnescale for detecting displacement is not a rocker arm itself and because the abutment position is deviated from the axis of an adjusting screw, due to which readjustment is required. In a method of adjusting and confirming a tappet clearance between an adjusting screw in a rocker arm and a valve stem, the adjusting screw is driven until the face portion of the valve stem is separate from a valve seat, thereafter the adjusting screw is loosened to retract the valve stem while measuring torque, an adjusting origin is determined from the measured torque, and the adjusting screw is loosened by an amount corresponding to a clearance setting specified value from the determined adjusting origin. After that the clearance setting specified value is confirmed with a displacement gauge.

REFERENCES:
patent: 6205850 (2001-03-01), Wehrman et al.
patent: 59-007716 (1984-01-01), None
patent: 03-206306 (1991-09-01), None
patent: 07-310511 (1995-11-01), None
patent: 2001-027106 (2001-01-01), None

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