cam timing off. need help please
Thread Starter
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Cruiser
Joined: Jan 2010
Posts: 235
Likes: 0
From: White House, Tennessee
There is nothing wrong.
There are two crankshaft revolutions for each camshaft revolution (one compression stroke, one exhaust stroke).
Simply rotate the crankshaft one revolution and the timing marks will align. And yes you can do this by turning the rear wheel. Either direction is ok.
The reason for the pushrod "pop" you mentioned is because that cylinder (piston) was not at TDC of the compression stroke. Therefore the valves were not in the closed position and the "pop" you heard/felt was the preload on the pushrod because of the valves being partially open.
Hope this makes sense to you.
I assume you have adjustable pushrods to re-install? From the questions you asked here, and this is not a jab at you but rather a precaution you need to be aware of, make sure you understand the adjustment procedure. It's more than simply sticking them in there and adjusting the length to take up the clearance.
There are two crankshaft revolutions for each camshaft revolution (one compression stroke, one exhaust stroke).
Simply rotate the crankshaft one revolution and the timing marks will align. And yes you can do this by turning the rear wheel. Either direction is ok.
The reason for the pushrod "pop" you mentioned is because that cylinder (piston) was not at TDC of the compression stroke. Therefore the valves were not in the closed position and the "pop" you heard/felt was the preload on the pushrod because of the valves being partially open.
Hope this makes sense to you.
I assume you have adjustable pushrods to re-install? From the questions you asked here, and this is not a jab at you but rather a precaution you need to be aware of, make sure you understand the adjustment procedure. It's more than simply sticking them in there and adjusting the length to take up the clearance.
Stellar HDF Member
Joined: Mar 2008
Posts: 2,921
Likes: 33
From: Lewisberry PA
read this thread and the manual a few times
Another forum member (bowhunter61) helped me swap cams last weekend. When you re-assemble and put the adj push rods in, you want to make sure you are TDC on the compression stroke.
When we did this, we read the manual and atrain68s write up. We copied all of atrains post into a word document. 1 of us read the manual, and the other the word document. Here is the link to atrain68s post.
https://www.hdforums.com/forum/touri...-write-up.html
When we did this, we read the manual and atrain68s write up. We copied all of atrains post into a word document. 1 of us read the manual, and the other the word document. Here is the link to atrain68s post.
https://www.hdforums.com/forum/touri...-write-up.html
Thread Starter
|
Cruiser
Joined: Jan 2010
Posts: 235
Likes: 0
From: White House, Tennessee
Another forum member (bowhunter61) helped me swap cams last weekend. When you re-assemble and put the adj push rods in, you want to make sure you are TDC on the compression stroke.
When we did this, we read the manual and atrain68s write up. We copied all of atrains post into a word document. 1 of us read the manual, and the other the word document. Here is the link to atrain68s post.
https://www.hdforums.com/forum/touri...-write-up.html
When we did this, we read the manual and atrain68s write up. We copied all of atrains post into a word document. 1 of us read the manual, and the other the word document. Here is the link to atrain68s post.
https://www.hdforums.com/forum/touri...-write-up.html
thanks for the help. I am sure I will have have questions when I get that far. Thanks again.
Elite HDF Member
Joined: Nov 2010
Posts: 3,846
Likes: 173
From: Simi Valley, CA
The bottom line is this... The lifter needs to be somewhere on the base circle of the cam when you adjust the pushrod length. TDC of the compression stroke is one way (but not the only way) to accomplish this.
Road Master
Joined: Apr 2010
Posts: 862
Likes: 1
From: N Dak
I just put my finger in the hole and felt the lifter go down and hit the base circle and installed my pushrod and adjusted. Let it bleed down and on to the other. Guess I didn't worry to much about TDC, I was more concerned to get them at the base circle and at their lowest point. Runs great with no clatter so it must of worked.
Seasoned HDF Member
Joined: Dec 2005
Posts: 5,464
Likes: 624
Now you are ready to adjust the pushrod. You need to know what the thread pitch of the rods are. Mine were 28 threads per inch. You want to push the lifter plunger .100 down, so you would turn the push rod out 2.8 turns. Mark the push rod with some white out so you can count the number of turns.
Wait at least 20 minutes for the lifter to bleed down and then rotate the wheel to get the other cam on the base circle so those lifters are at their lowest point. Then repeat then install process.
Hope this helps.
Zach
Thread Starter
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Cruiser
Joined: Jan 2010
Posts: 235
Likes: 0
From: White House, Tennessee
Well I am at a stopping point. The slide hammer wouldn't pull out the cam bearings so I am waiting for the tool from Gary Beaty to arrive before I can continue. I was hoping to have this done today but it will be a few days now before I can finish.
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Stellar HDF Member
Joined: Mar 2008
Posts: 2,921
Likes: 33
From: Lewisberry PA
That tool is worth the money, you may want to ask him about the tool for the putting the covers on the adj pushrods.
