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F-4 Mag is close ?

B

banjoman09

Well-known Member
I know- you guys are tired of this post- bare with me...Im really close- (I think.) The points "snap" about 3/4" past "D-C".... or between D_C and E-O; whatever that is? Then, after the E-O is a 1.0 ........ Is my timing right?
 
use those two bolts on the mag coupler and get it closer to D. C. back the mag up a couple holes and try that. if you would do the screw driver thing it will tell you where the piston is when mag fires. get it to fire with lever just off the stop position with piston at tdc. if your firing as piston is going down your timing is too late, as in the 3/4" your talking about.
 
ok...will do tomorrow.....I hope...full day again...but I dont want it to "snap" before....right.?
 
The E-O is "Exhaust Open", then other mark you're seeing is actually I-O, "Intake Open"

I agree with rustred, remove the two bolts and back the mag up a couple holes and try it again.
 
with advance lever up get it to fire pretty much at d.c. then once it is running you have the lever to advance timing. remember to have lever not quite to the top as top is engine kill. thought it was running already.
 
well ok....my book says "lever all the way to top(retard timing) when setting mag..... but either way should work ?
 
that is correct, but u wont see the spark when lever is fully up, not a big deal as i have said to do the timing with lever up , but too many giving instructions and gets a person side tracked. i have been setting these mags for over forty years and had to learn it on my own from trial and error.never did look in a manual for the first one i tackled. i like to have it just off full retard position so i can see the spark.
 
Don't even mess with the marks on flywheel. Get #1 piston on compression stroke, get a flashlight and slowly crank as it is coming to top. As it just gets to top, or TDC or dead spot , the mag should snap. If it does you're timed. If a little before or after you'll have to pull the little 1/4-20 adjusting screws, disengage the paw and spin a little one way or other til you get it right. Retard lever I like to keep almost all way up. It's a good learning experience but once you get it you'll see how easy it is.
 
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