Special tools and a source of compressed air are necessary to enable you change broken valve springs or faulty Valve Stem Oil Seals without taking off the cylinder head. Start by removing the spark plug from that particular cylinder (or all plugs if changing all seals). One cylinder at a time, start with number one cylinder at TDC, following the firing order. Put an adaptor into the spark plug hole, then link it up with an airline hose for supplying compressed air. Unbolt the
Rocker Arm nut, remove the pivot ball and rocker arm from the leaking valve and take out the push rod. Supply compressed air to the cylinder in order to retain valves. Bring down valve spring compressors so that they can squeeze springs and hence release them from keepers. Get rid of spring retainer and valve spring, then replace guide seal making sure it is pushed downwards onto top of guide tube. Apply engine oil on valve stems and insert spring back followed by retainer forcing springs to their right places using locking tabs. Disconnect air hose, unthread adapter then reassemble rocker arm along with
Pushrod, spark plug and finally valve cover. Turn on engine and look for oil spills as well as strange noises near that head cover area. Failure of pressure to hold down valve when closed may suggest either damage in valve itself or its seat or both thus meaning extensive repair by removing head.