push rods
Thread Starter
|
Cruiser
Joined: Feb 2010
Posts: 138
Likes: 0
push rods
Got it all ready to adjust rods {24tpi} know its 3.6 turns, my question is how do I know for sure cam lobes are all the way down, turning the tire and can see both valves closed on cylinder, rock the tire and all that, just looking for absolute cam lobe bottom
Last edited by evofloyd; Mar 2, 2011 at 11:14 AM.
Seasoned HDF Member
Joined: Aug 2007
Posts: 8,202
Likes: 3,089
From: NW AR
It isn't all that important. The cam is at the bottom of the circle for a good length of rotation, not just one magic spot. Just rotate the motor until the valve closes and isn't moving any more and that is the base circle.
Thread Starter
|
Cruiser
Joined: Feb 2010
Posts: 138
Likes: 0
thanks
Stellar HDF Member
Joined: May 2009
Posts: 2,856
Likes: 127
From: Middle of Kansas
What I do is get the piston at TDC for the one I am working on. Pretty easy on the front cyl. if you take out the timing plug. There is a mark on the flywheel for TDC. You can also take out a spark plug, and stick a plastic straw in the plug hole to feel when the piston is at TDC. Just rock the wheel back and forth a little and you will feel it. Then for the rear, turn the wheel forward until you feel the piston at TDC on the rear cyl. It works for me.
Road Warrior
Joined: Dec 2007
Posts: 1,854
Likes: 20
From: Eagle River WI
Good God got to move from 1666 Ok how's Rufus doing /is gas going down to 2.79 a gallon by 3/6/2011 ?
Trending Topics
Cruiser
Joined: Dec 2010
Posts: 110
Likes: 1
From: central NC
Your gonna have the plugs out anyway and I have the Chrome timing hole cover over mine so I just use a twisted pipe cleaner to reach in and feel top dead center. Rule of thumb is to just put a decimal in between the number of the pushrod TPI Which in your case is 2.4 turns out. This will give you the 1 inch sink which is half of the total 2 inches. I know some people do put 3.6 turns on a 24 which will sink it almost 1.5 inches instead. I have rivera taperlites with 40 TPI and the directions say 4 full turns.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
Harley-Davidson Fat Boy Becomes a Dark, Decepticon-Inspired Custom
Verdad Gallardo
6 Weirdest Harley-Davidsons Ever Sold to the Public
Verdad Gallardo
7 Times Harley-Davidson Chucked Tradition Out the Window
Verdad Gallardo
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Seasoned HDF Member
Joined: Aug 2007
Posts: 8,202
Likes: 3,089
From: NW AR
It's just math, guys. I like that "stick a decimal in it, it's done." That's slick. I'll have to remember that one.
1 inch / 24 threads (full rotations) per inch = 0.041666 inches per thread (full rotation).
0.100 inches / 0.041666 inches per thread (full rotation) = 2.4 threads (full rotations)
2.4 rotations * 6 flats/rotation = 14.4 flats. So, 14 and a half flats from zero lash and you're there, or 2.4 rotations on a 24 TPI pushrod.
Do the same thing with 40 TPI and you get 4 rotations, 24 flats.
1 inch / 24 threads (full rotations) per inch = 0.041666 inches per thread (full rotation).
0.100 inches / 0.041666 inches per thread (full rotation) = 2.4 threads (full rotations)
2.4 rotations * 6 flats/rotation = 14.4 flats. So, 14 and a half flats from zero lash and you're there, or 2.4 rotations on a 24 TPI pushrod.
Do the same thing with 40 TPI and you get 4 rotations, 24 flats.