Bought a head for my 301 that has been milled to just below the spark plug hole. I"d say at least .120 When putting it on the tractor I have four rods that are super tight with the adjusters backed off all the way. Is it do the cam position or will I have to shorten the rods. Have not torqued the head as yet until I can get an answer to this. HELP PLEASE
- Thread starter 460 Man
- Start date
Anonymous-0
Well-known Member
Pistons might be hitting the head? You can trim the outer edges back a little, around the compression chambers to help clear the piston domes if it has firecraters in it. Chad
Janicholson
Well-known Member
I am not sure your are talking about the pushrods in the valve train, but Here goes:
The valves must be adjusted in sequence. A simple way is to turn the engine in it's normal direction until #1 cylinder (front of tractor) just starts to open its exhaust valve. THEN ADJUST THE INTAKE
Then turn it until the intake just closes, and THEN ADJUST THE EXHAUST.
This positions the opposite valve in a known closed position on the cam. Each cylinder should be done the same way (remember to make sure the intake and exhaust are identified. From the front it is (from my memory) EI-IE-EI-IE-EI-IE. Look at the manifold to be sure.
If the pushrods are too long even then, adjustable pushrods are available from several sources. Google them. JimN
JimN
The valves must be adjusted in sequence. A simple way is to turn the engine in it's normal direction until #1 cylinder (front of tractor) just starts to open its exhaust valve. THEN ADJUST THE INTAKE
Then turn it until the intake just closes, and THEN ADJUST THE EXHAUST.
This positions the opposite valve in a known closed position on the cam. Each cylinder should be done the same way (remember to make sure the intake and exhaust are identified. From the front it is (from my memory) EI-IE-EI-IE-EI-IE. Look at the manifold to be sure.
If the pushrods are too long even then, adjustable pushrods are available from several sources. Google them. JimN
JimN
Anonymous-0
Well-known Member
Push rods binding from the head being milled down, wrong push rods, or they are not sitting on the lifter correctly? Do they move at all? Chad
Anonymous-0
Well-known Member
Check valve settings as said. If you cannot get the correct valve clearances, then shorter push rods. Good you did not torque it down yet. One thing to do is to put a small amount of non sticky putty on top of the pistons and turn it over by crank if possible and see what the minimum clearances are between the piston/head/valves. The cam also has to be in the right timing. .120 is a lot of shaving in my mind, but what do I know. There should be specs about minimum piston to valve clearance you need to maintain. Otherwise at high rpm they collide.
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