Valve guide wear cause =504=

worn valve guides or piston rings
excessive valve clearance will cause
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3 Oct 2017 Valve guide wear can result in engine misfires due to compression loss. This guide will reflect the cause and effect, along with repair Cause: Excessive localized heat in the valve head, distortion and seat leakage (poor b) Worn valve guide and/or misalignment of valve stem and guide.A. Valve and valve guide wear caused by poor maintenance. The first two pictures show the wear in the lower part of the valve guide closest to the valve head. PROBLEMS ON THE INTAKE SIDE: Oil drawn into the engine past worn intake guides can foul spark plugs. It will cause the engine to emit higher than normal unburned hydrocarbon (HC) emissions. Also contribute to a rapid buildup of carbon deposits on the backs of the intake valves and in the combustion chamber. 16 Mar 2017 If you see a billow of smoke from the exhaust pipe -- especially any blue smoke, which is caused by burning oil -- it is a sign that the valve guides are worn. Several reasons for the excess guide and valve stem wear for the stud type rocker is caused by the uneven force exerted against the tip end of the valve by the The following valve damage and sealing problems can be caused by a worn valve guide: Excessive wear of the valve stem faces. Worn rocker arms on one side. Increased oil consumption due to worn valve stem seals. Cause: The valve guide clearance is too large due to excessive wear of the valve guides or due to excessive reaming during repair. Consequence: The influx of hot gases can cause significant carbon deposits in the area of the stem guide. Excessive valve stem and guide wear can occur on inlet and exhaust valves. Whilst there is a large number of potential causes for failure, some are actually