Valve Installation; Lifters; Oversize Guides - Tecumseh VLV Technician's Handbook

WRONG
RIGHT
VALVE ADJUSTMENT. Clearance between the valve
stem and lifter must be set to the recommended
specifications when the engine is cold (see page 40).
Check these clearances with the piston T.D.C. on the
compression stroke. Grind end of valve stem with a
valve grinder, or use a "V" block to hold the valve square
on grinding wheel, grinding to the proper .004" to .008"
clearance.
NOTE: Some emissionized engines use intake valve
stem seals to maintain proper oil control and emission
compliance, they must be replaced if the valve has been
removed.
VALVE INSTALLATION. To reinstall valves, position
valve caps and spring in the valve compartment. Install
valves in guides with valve marked "I" in the intake port.
The valve stem must pass through the spring. The valve
spring cap should sit around the valve lifter exposed
end. Use a valve spring compressor to compress the
valve spring. Position the valve spring cap onto the
valve stem and release valve spring tension to lock cap
in place.
www.SmallEngineDiscount.com
FACE
Not For Resale
VALVE LIFTERS. It is a good practice not to
interchange lifters, even though they are identical, once
a wear pattern has been established.
OVERSIZE VALVE GUIDES. Valve guides are
permanently installed in the cylinder. If they become
worn excessively, they can be reamed oversized to
accommodate a 1/32'' over size valve stem.
Ream guides with a straight shanked hand reamer or
low speed drill press. Refer to Table of Specifications
to determine correct oversize dimension. Reamers are
available through your Tecumseh parts suppliers. See
Tool Section for correct part numbers.
After oversizing valve guides the seats must be recut to
align with the valve guides.
31