B2400 valve adjustment help

[bones1]

Hello. I am putting my b2400 D1105 motor back together and can't understand the valve adjustment procedure to save my arse. Can anyone walk me through the process and point me in the right direction. I have the factor manuals and something is lost in the translation. Thanks for any help.

 

[ericm979]

For each cylinder you're going to adjust you need to rotate the engine so that cylinder's valves are closed. You need to turn the crank until that cylinder is on top dead center- the intake valve is closed after the intake event and the exhaust valve has not opened yet. On a low rpm engine like a tractor engine both valves will be closed for a fairly large number of degrees, so you don't need to be exact.

If you are going off a mark on the crank, remember that in a four stroke the entire intake, compression, power, exhaust cycle takes two crankshaft revolutions. So you need to check that when the crank is at TDC (or whatever mark you're supposed to use) it's between the compression and power strokes and not between the exhaust and intake strokes. In an engine that's assembled and has been running it's easy to tell- the valves will be open if it's between the exhaust and intake strokes.

If you are starting from scratch (i.e. you removed the rocker shaft and changed all the adjustments or replaced the rockers) it's harder. But you should be able to adjust each valve so that you can see the rocker is loose when that valve's cam is on the base circle (there should be a small amount of play in the rocker at some point in the two rotation cycle). Then you can use the rule above.

 

[100 td]

Try youtube if you are stuck, I haven't looked at any on there, but there are some which may help

 

[rScotty]

Hello. I am putting my b2400 D1105 motor back together and can't understand the valve adjustment procedure to save my arse. Can anyone walk me through the process and point me in the right direction. I have the factor manuals and something is lost in the translation. Thanks for any help.

What is it you are stuck on for setting the valves? For most people it is how to know the positon of the pistons relative to the valves. We know we can always set the valve clearance when that cylinder's piston is at top dead center of the compression stroke. But it isnt always easy to find this position and be confident of it. In fact it can be darn hard to determine. Especially knowing that some modern engines have cams that feature valve timing with valve overlap and tappet quieting ramps - or both..

There is one trick that always works for finding when you can adjust a valve and be absolutely sure that that you are at the point of maximum clearance regardless of any oddball cam timing.

First, make sure you are rotating the engine in the normal rotation direction - the same as if it was was running.

Next, make sure you are understand which intake and which exhaust valve goes with each cylinder. In fact, it doesn't hurt to label them somehow just to be sure.

Now chose a cylinder and watch that cylinder's valves as you rotate the engine. You can always adjust the intake valve when that cylinder's exhaust valve is just beginning to open. And you can always adjust the exhaust valve when that cylinder's intake valve has just finished closing.
That's it; good luck.
rScotty