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TDC

J

jsr8011

Member
I'm trying to do the TDC test using a drinking straw on the compression stroke on my '45 H. Do I need to remove the generator do do this? I can't seem to get the correct vertical angle to push the straw down the cylinder. Am I missing something?

John
 
Heat the straw at about 2 inches with a lighter (not on fire) and bend it so it will feel the piston, but have a handle. Remember it can be on TDC compression(good) or TDC exhaust/intake(bad). If the valve cover is off, both valves closed Compression. if VC is on. the rotor should point to #1 plug wire. Jim
 
Solid (not stranded) #10 or #12 copper wire works well. Simply bend as needed to get by the generator then use it to "feel" the piston in the jug.
 
(quoted from post at 13:43:20 10/08/14) Remove the valve cover to tell the difference between Intake and Exhaust strokes.
Click to expand...

What he said! I messed around with straws and my thumb in the plug hole while someone else cranked, my wife's thumb while I cranked, and wasted 4 days of evenings trying to get to #1 TDC compression. Save yourself some pain. Take the valve cover off, turn with a crank till both valves on #1 close, then turn it til the first of the double-marks lines up with the pointer. Works the first time.

Five minutes later, and she started on the 2nd pull of the crank.
 
I'm not sure where your trouble was Alan, but it's not that difficult usually. Even if you don't get a perfect seal with your thumb the WHOOSH! is pretty obvious on the compression stroke.
 
(quoted from post at 13:20:06 10/09/14) I'm not sure where your trouble was Alan, but it's not that difficult usually. Even if you don't get a perfect seal with your thumb the WHOOSH! is pretty obvious on the compression stroke.
Click to expand...

Well, 2x I lost the light just as I was trying to get the timing marks up to the pointer. I should have just pulled it back to the shop rather than working on it in the field. It stinks when you get all the way back to the tractor w/ 15 min. of daylight left. 8(
 
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