Hi Guys;  Wanting to adjust my valves, using the turn 90 deg method.  Does any one make a degree ribbion that can be added to our Damp. or pulley. OR how do you make the pulley to get an accrete 90 Deg mark, seems to me if the marks are not on right-- the valves will not be at  the position to adjust.  Hope you can understand  my jabbering.. HHHEEELLLPPP    God Bless   Eddie

PS     Thanks in advance

Eddie

Lake Forest, Ca. 92630

Let me see if I can explain without a drawing. Starting at the TDC mark, draw a line through the damper and place a mark 180 degrees across from it. Then starting from the center of the crank draw a line at a right angle and place a mark on each side of the damper. Much easier if done before the damper is installed, but it can be done with it installed.

Glen Henderson



Freedom is not Free

Letohatchee, AL

Cut a strip of paper equal to (pi x diameter) / 4. Use this strip, starting at the 0 mark to mark every 90 degrees.


Lawrenceville, GA

Glen’s method is definitely the quickest and is more than adequate for using to set the valves.  But if you want to be exact then measure the damper, multiply by Pi (3.14) and then divide by four.  This will give you the length around the damper between at each 90° interval if starting at the TDC mark.

Example:  If the damper is 6½" in diameter, then you will mark the damper at 4.908" intervals starting at TDC.

 

Lorena, Texas (South of Waco)

It is certainly much easier with the damper off.I had mine off and cleaned it up.Painted it black and then marked the 90 degree intervals with a dot of white paint.I also marked the intervals with a small  shallow drill hole in case the dots disappear over time.VERY handy for adjusting valves.

  

Thank You Guys;   Will give it a shot--   What is the diam. of the damp.  55 T-Bird  rebuilt by Damp. Doc. about a year ago. Sorry Ted, but what is pi??   Not a math student!   Again   Many Thanks   God Bless     Eddie

Eddie

Lake Forest, Ca. 92630

Pi is the ratio of a circles circumference to its diameter. Pi = C / d. It is always equal to 3.14159 and actually goes on for a very long time. There is likely some supercomputer running right now trying to find out if the value of pi to a great number of decimal places.


Lawrenceville, GA

Doesn't the accuracy of this "shortcut" method of setting lash depend on precision of cam machining & chain tension/wear?

6 VOLTS/POS. GRD. NW INDIANA

I would think that there is a considerable space of cam "base circle" at TDC and on either side of it. True? Its pretty much directly opposite the "overlap"......

I've used this method of finding TDC - then placing a mark at three 90° intervals (1/4 turn) - and then going through the firing order to set them. Find zero lash on both valves then loosen 1/4 turn - turn the crank 1/4 turn and so on.

 
 Steve Metzger       Tucson, Arizona

Here's another method of adjusting valves.

Rotate the engine until the exhaust rocker just begins to move. Adjust the intake valve at this point.

Rotate the engine until the intake rocker just stops moving. Adjust the exhaust rocker at this point.

Eddie, Engle calls for .018" intake and .020" exhaust on your cam.

While we're talking about adjusting valves I would like to stress that only Original Ford cams should be lashed at the spec in the manual.  Performance cams can be very different than OEM specs. Some cams lash as tight as .012" and some as loose as .026".

Most Schneider cams are tight lash and will be very noisy at factory specs. Some older designs require wide lash numbers and your off the seat duration will be in the 320+ degree range if you lash them at .018".

http://ford-y-block.com 

20 miles east of San Diego, 20 miles north of Mexico