VALVE SPRING, RETAINER AND STEM SEAL (With The Cylinder Head Installed) (Cont’d)
A 1
2
Be sure piston is at top dead center or bottom dead center before applying air pressure. If not the engine can turn and cause injury. W–2264–0897 B–07298
Compress the valve spring, and removethe valve spring, retainer locks. Release the spring compressor remove the valve spring, rotator, retainer and the valve stem to seal. Install The Valve Spring
Dealer Copy -- Not for Resale
Install a new seal over the valve stem. Two types are used. Early engines use an umbrella type (Item 1) [A]. Later production engines use pedestal type which fasten the valve stem guide (Item 2) [A]. Install the valve spring and retainer on the valve stem. Compress the valve spring Put the valve spring retainer locks in the valve stem grooves and release the spring at a slow rate to engage the locks in the retainer. Remove the air hose and adapter. Put oil on both ends of the pushrods and install the pushrods in the correct bores. Install the rocker shaft assembly to the cylinder head, put the pushrods on the adjustment screws. Tighten the bolts evenly to specifications. Adjust the valve clearances to specifications. Install the rocker cover. Install the spark plugs and connect the wires to the spark plugs in the correct firing order. Disconnect the wires from the spark plugs and remove the rocker cover. Make a second adjustment of the valve clearances (hot) to specifications. Install the rocker cover with a new gasket and tighten the fastening screws to specification. Put the spark plug wires in the rocker cover fastener and connect them to the correct spark plugs.
270 Revised Oct. 97of 454
–7B–26–
741, 742, 743, 743DS Bobcat Loader Service Manual
