[Hermit]

So I have my sons 2003 400ex torn down to do a top end rebuild.
During teardown, we made sure we rotated the crankshaft to TDC where the cam lobes were facing down.
This allowed us to remove the one bolt from the cam sprocket.
In order to remove the second bolt from the camsprocket, we rotated the crankshaft another revolution to TDC.

My question is, now that we have rotated the camshaft from the original position (with lobes down) in order to get the bolt out, what position to I put the lobes in during reinstallation?

Hopefully this makes sense.

 

[dr. feelgood]

Lobes always face down when installing the cam so that there is not tension on the rockers. With the piston at the top of the bore and the cam lobes down you are at TDC on the compression stroke. Works for all 4-strokes

Rob

 

[Hermit]

Thanks for the info Dr.
So should I rotate crankshaft another revolution prior to installing cam with lobes down... or install the cam lobes down in the current position.
As i had stated earlier, I had rotated it one revolution from the origan TDC position to get the second sproket bolt out.
Thanks again!

 

[SlammedRanger]

You remove the 2 allen head covers on the left side of the engine and line up the line next to the T in the smaller hole(there is a trench down the threads to line up with) while rotating with the 17mm in the bigger hole in a counter clock wise direction only. You will have to make sure the piston is at top through the spark plug hole. At that point you are at perfect TDC.

At that point put in cam with lobes facing down and your good to go

 

[TRX2fiveO]

Welcome to the forums,
If you remove the dowel pins from the head on each end of the cam and slip the bearing off you won't have to remove the cam gear.

 

[SlammedRanger]

Welcome to the forums,
If you remove the dowel pins from the head on each end of the cam and slip the bearing off you won't have to remove the cam gear.

Thats how i do it aswell lol. I just couldnt put it to words as easy as you did.

 

[Hermit]

Thanks for the information. Hope to be back on this project for the weekend to wrap things up.