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The valves are the same specs. Is it possible that a new valve leaks, yew. However if both valve leak then there are other problems. Does the valve only leak when hot water is called for? Then check temperature setting on heater. Does it lek all the time? The water pressure is to high ,
Valve clearances are set by either tappet screws in the lifters or on a lot of small engines, clearances must be set by either cutting out valve seats with a special cutter tool (to DECREASE clearances) or grinding the end of the valve (to INCREASE clearances) and generally are from .008-.010 on intake valves and .010-.012 on exhaust valves. Check engine specs to insure proper clearances.
Are you trying to set the ignition or valve timing ? The ignition timing is factory set and changes with engine rpm - you can set the air gap between the flywheel and the ignition unit which should be around 0.25mm (0.010") Excessive air gap will retard the ignition timing. Unless you\'ve had the engine apart, the valve timing won\'t need re-setting. The valve clearances will need setting from time time and the clearance between valve and rocker is 0.1mm and is adjusted with both valves closed and piston at the top of it\'s stroke - you should replace the gasket and copper washer at the same time.
a briggs over head valve engine turn the engine til one valve opens set the other valve to .006 turn til the other valve opens then set the closed one to .006 it not the text book way but it works for me
With the tappet cover off, rotate the engine in the normal direction of rotation until you see #4 cylinder valves rock - open/close in succession. This will be TDC on #1 - set the valve clearances. Turn the engine until your see #2 valves rock, set #5 valves, turn the engine till #6 valves rock, set # 3 valves, turn the engine until #3 valves rock, set # 6 valves, turn engine till #5 valves rock, set # 2 valves, turn engine till #1 valves rock, set # 4 valves. Once you have located #1 TDC (the second mark in the pulley should be lined up with the cover mark), it is only 60 deg. to get to the next cylinder to set. If you accidentally go past the setting point, go back and approach the setting point again in the direction of engine rotation. When you come to setting # 6 the TDC marks should be aligned again.
sounds as though the thermostatic radiator valve is stuck although the valve settings can be set to max. sometimes hitting the side of the valve will free the stuck spindle & get it working again.
If not a drain down of the system & a new valve fitted
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