806 timing for camshaft

tneathery

New User
Have an 806 where camshaft broke. I have replaced the camshaft and lined up all timing marks as indicated in the manual. Tractor would not start. Have been told the cam is 180 degrees out of time. Here is my problem. The camshaft is keyed. If I rotate the cam 180 degrees, the timing marks will not be lined up anymore. What am I missing? Just as a note, I did not get into the injector pump so the position of its timing has not changed since the tractor was running. Only thing changed is a new camshaft. Any help is appreciated.
 
"If I rotate the cam 180 degrees, the timing marks will not be lined up anymore."

The CAM is NOT 180º out of time. If you were to turn it exactly 180º, then mesh the gears and turn the crank one turn... guess what... the marks WILL be back in line. Turn the crank one turn... the marks will be 180º AGAIN.

I'm gonna GUESS your issue is IP timing.
 
Just get the engine to number one compression (both valves loose on number one, both valves tight on number six) and then align the injection pump timing mark to 8 degrees before tdc. If you didn't damage valves and pistons, you will be good to go. Probably want to replace dampner pulley also to prevent another cam failure.
 
If ya bent push rods then you also have bent valves and maybe more damage . And if it is not starting then it may also have twisted the shaft in the pump or it may have broken also . So if you had the ft cove off and you aligned all the timing marks and you have the pump in time then it WILL start Unless you have what i said before.There is no room for valves and pistons once something gets out of time and there is NO clearance ever for a feeler gauge between the rocker and the valve when the engine is running .
 
Thanks for the info. The tractor is not here at my house so on my next trip to the farm I will look into the pump timing and shaft condition. I guess there is no way to fully evaluate the valves without taking down the motor?? Man I wish one of you guys was close by to have a look!
 
Oh, I think that is the pulley on the crankshaft that operates the fan and alternator, correct? How does that cause camshaft failure?
 
The pulley dampens the twisting motions of the crankshaft which transfer to the camshaft gear. IH and John Deere both always recommend changing dampner pulley if camshaft failure . Also, Deere had a hour maintenance schedule to change them routinely. Did a few of them also. When the rubber deteriorates it no longer dampens properly. Not my opinion, engineering opinion.
 

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