I have a 5 year old newer Briggs 550 (about 5hp) single cylinder engine I could not start. I checked compression and it's zero. I pulled the OHV valve cover off and saw little movement in the valves nor the push rods. This engine has two thin push rods which push up the rocker which in-turn applies force to the valves to close them.
I decided to pull the head and the cylinder looks very good and well oiled. The push rods are confirmed to have very little travel in them. It was not really enough movement to force the valves to close. Both valves seem to have the same limited movement. The push rods are not attached to anything and can be pulled out of the cylinder head with ease - I am guessing this is normal and they should not be affixed in any way. There is an adjustment nut on the rockers and the nut is all the way tight. Not sure if this is how to adjust the clearance or not.
I would assume the crankshaft lobes cause the rods to move in and out - right?
I can post of video if it would help.
I decided to pull the head and the cylinder looks very good and well oiled. The push rods are confirmed to have very little travel in them. It was not really enough movement to force the valves to close. Both valves seem to have the same limited movement. The push rods are not attached to anything and can be pulled out of the cylinder head with ease - I am guessing this is normal and they should not be affixed in any way. There is an adjustment nut on the rockers and the nut is all the way tight. Not sure if this is how to adjust the clearance or not.
I would assume the crankshaft lobes cause the rods to move in and out - right?
I can post of video if it would help.