B1750 Valve Adjustments

[aquetrac]

I have a Kubota B1750HSD and I want to adjust the valve clearances. Does anyone know the gaps? Also looking from the front of the tractor which is the first valve in each group, intake or exhaust? Thanks!

 

[cp1969]

I can't help you with the gaps, but you should be able to tell intake from exhaust by the position of the manifolds. If the exhaust is first, its manifold connection will be closer to the front of the head than the intake manifold connection. Exhausts are almost always the first valve from the front of the head. I can't remember ever seeing otherwise.

 

[wushaw]

I would suggest you have the dealer adjust the valve clearances.

 

[cp1969]

It's no big deal to adjust valves on a pushrod engine.

Another way of identifying the valves is to rotate the engine with the valve cover off. For each cylinder, you will see a valve open and close then immediately the second valve will start to open. The valve that opened and closed first is the exhaust.

Tip: When setting valve clearance, you want to make sure the lifter is not on any of the surfaces of a cam lobe that make up the lifting portion of it. With the cylinder at TDC on a power stroke, both valves can be set at one time. However, this is not the ideal place to set valve clearance nor is it all that easy to find. The best place to set clearance is when the lifter is 180 degrees away from the peak of the cam lobe and there is an easy way to do this. Rotate the engine till the exhaust valve just starts to open. Adjust the intake valve clearance in this position. Rotate the engine until the intake valve has just finished closing--then adjust the exhaust valve. That way you are sure that the lifter was on what is called the base circle of the cam.