PN 57.4400.0100_020115 - Genie

Section 12Cylinder Head Assembly700 SeriesOperation:Valve seat insert - to fitRecommended torque:Engine type Nm lbf ft kgf m---Special notes:12.15Caution: A new valve guide must be fitted to the cylinder head before a newvalve seat insert is fitted. This is necessary to maintain concentricity betweenthe valve guide and the seat for the valve.Note: Cylinder heads that are fitted with new valve seat inserts and new valveguides (pre-finished) are available.1. Remove the valve guide and clean the bore into which the guide is to be fitted.2. Fit new valve guides, operation 12.13.3. With the bore of the new valve guide used as a pilot, machine out the old valve seat insert. Remove all debris and clean therecess for the insert.Caution: If the bottom face of the cylinder head has been machined, the depth of the recess for the valve seat may have changed.4. Measure the depth of the recess in two places 90° apart. The correct depths are:- UA and UC engines: 8,35/8,55 mm (0.329/0.337 in)- UB engines: 8,20/8,40 mm (0.320/0.330 in)5. If the depth of the recess has been reduced, surface grind the bottom face of the insert by an equivalent amount. Check thedepth of the insert and ensure that it is fitted correctly.6. If the insert has been surface ground, ensure that the outer edge of the back face of the insert has a 0,7/1,2 mm (0.03/0.05 in)chamfer at 29° /31°, to the vertical.7. With the bore of the valve guide used as a pilot, and with the rear face of the insert towards the cylinder head, press the insertinto the recess with the valve seat insert tool, see Data and dimensions.Caution: Do not use a hammer or use lubrication to fit the insert. Use a hydraulic press or a hand press in one continuousmovement.8. Ensure that when fitted, the bottom face of the insert is in contact with the bottom of the recess in the cylinder head. When fittedcorrectly, the depth of the insert, below the bottom face of the cylinder head should be:- UA and UC engines: 2,15/2,45 mm (0.085/0.096 in)- UB engines: 2,4/2,7 mm (0.09/0.11 in)The depth of the insert should be measured in two places, at 90° to each other.9. Cut the valve seat at 45° (an included angle of 90°) for all valves, operation 12.14.Ensure that the depth of the valve head below the face of the cylinder head is within the production limits, see data and dimensions.Work as near as possible to the minimum figure to allow for future wear on the valve seat.05/99Printed in England© Propriety information of Perkins Engines Company Limited, all rights reserved50424 51-19M-1-SM 01-29-02 57.4400.0100