I am working on my riding mower Briggs and Stratton 15.5 OHV. After replacing my headgasket my intake valve did not move when I turned shaft by hand. I took it back apart and believe I have my pushrods positioned correctly but cannot seem to get the rockkers back over the valves and rods. Maybe its because I am a girl and just need to man up but I thought it should be easier. Anyone got any tips?
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you'll need to get the clearance between the rocker arm and the valve, usually it's in the range of .060 - .080. then remove the nut from your rocker arm, install the rocker arm onto the pushrod, and valve spring (reminder, engine should be at top dead center) then reinstall the nut,and set your valve clearance.
Okay, here we go. I have been doing this for 150 years, so I think I know why you are having the problem. The piston must be at Top-Dead-Center (TDC) on the FIRING stroke. Both valves will be what is known as On The Rock. That is or means the push-rods will be resting on the camshaft inside the engine where there is no lift (bottomed). The best way to find this out is to look at the flywheel and see where the magnet is in relation to the ignition coil. The engine actually fires twice (it's just the way it is), but if yo see the magnet on the ignition coil then chances are you are either at TDC on the compression stroke or BDC on the induction stroke. Confused yet? Let's make it easy to tell the difference. When the piston is at TDC the piston will be at the to p of the bore and the magnet will be on the ignition coil. The valve push-rods will be at the same height. This is when you fit the rockers. As you can see there will be two nuts or a single nylock nut that has a nylon insert. If you have the nylock nut then then just tighten the inlet to 0.007 and the exhaust to 0.010. The same applies with the two nut system, except that when you have set the gaps you have to spin the locking nut down and hold the set nut (the first one) and then tighten the other nut down tight to the set nut. But I guess you knew all this, eh. Good to go, eh. I hope I might have been some help. mmalky: 50 years fixing small and large lawnmowers.
