Kubota GR1600-II Riding Mower Repair Service Manual

Table of Contents

Kubota GR1600-II Riding Manual

Main sections and selected subjects identified in the source documentation:

• Kubota GR1600-II Mower Workshop Service Manual
• Kubota Mower Model GR1600-II
• ■ General
• ■ Mechanism
• ■ Servicing
• Manual Extract Valve Lapping
• Apply compound evenly to the valve lapping surface.
• Insert the valve into the valve guide. Lap the valve onto its seat with a valve flapper or screwdriver.
• After lapping the valve, wash the compound away and apply oil, then repeat valve lapping with oil.
• Apply prussian blue to the contact surface to check the seated rate. If it is less than 70 %, repeat valve lapping again.
• ■ IMPORTANT
• When valve lapping is performed, be sure to check the valve recessing and adjust the valve clearance after assembling the valve.
• Free Length and Tilt of Valve Spring
• Measure the free length (A) of valve spring with vernier calipers. If the measurement is less than the allowable limit, replace it.
• Put the valve spring on a surface plate, place a square on the side of the valve spring.
• Check to see if the entire side is in contact with the square. Rotate the valve spring and measure the maximum tilt (B).
• If the measurement exceeds the allowable limit, replace it.
• Check the entire surface of the valve spring for scratches. If there is any defect, replace it.