Timing notch

[mccoop72]

Hello everyone….my first technical question.

I’m checking timing on my 68 A1 and my dampener has two distinct notches. All my manuals only refer to one notch. Any help would be appreciated.

Thanks.

[rickf]

There should only be one notch. Any possibility you can post a pic of what you are looking at? If you get a real close closeup that is great but then also get one from about top of engine distance for perspective.

[mccoop72]

Here’s the best pic I could get. I did check further and have found that the lower mark is definitely the 6 degree btdc. I pulled the plug and verified.

[rickf]

I agree, that upper notch appears to have been put there with a chisel. If I had to guess I would bet that is on TDC.

[Mark]

I put a dab of white paint/ florescent paint on the notch to help see it better, used a wire brush on it to define the the notch better.

[mccoop72]

Thanks for the help guys.

[mccoop72]

A little update. Couldn't time the distributor as I kept running out of travel. So, I pulled the distributor and barred engine to around TDC.....looks like the oil pump is 180 out.......**ck. Well looks like I'm pulling my power pack. At least its cold and snowy out and not good for driving!

tempImagejRT3Mo.gif

[Mark]

I was thinking of the wrong notch-the one on the vibration dampener

[rickf]

Did you have number 1 plug out to verify you were on compression on number 1?

[mccoop72]

Yeah, I verified compression on no.1

[1SGCAV77]

Later model dampers had 2 notches. One for 6 degrees. One for 30 degrees. Ignition timing is all laid out in TM 9-2320-218-20-1-1. Chapter 4-17.
Pages 4-72 and 4-73 specifically explaining why the 2 notches. I ran across this recently working on a friends A2. I too had not seen this before.
The notches on the A2 were on front and top.

[svramselaar]

hi

to take the engine out is a lot of work

if you take the ignition cover off rotor arm off
at the center of the axle is a wick take it out
now you see a spring ring or a screw take it off
get the ground plate or module out
now you can take the notch from the axle
turn it a half and put the ignition back together
now sits the rotor arm a half turn a round

45.jpg

george

[rickf]

If you do what George says be SURE to mark the distributor somehow to indicate what was done in case you rebuild the engine and then when you put the pump in right and you reinstall the distributor you will be pulling your hair out!!! I have several distributors here that were modified by turning and repinning the dog on the bottom of the shaft. This was done in the military since these were bought out of DRMO.

[mccoop72]

IMG_1840.jpeg

Thanks for the replies everyone. I had planned on pulling this engine sometime in the next year anyway. I was curious so I pulled the timing cover to double check static timing and it was right on. I attatched another pic of that oil pump position.

I went through that manual that was mentioned previously but I didn’t see where it explained the two notches. Unless that’s the end of the timing advance travel?

Thanks
Coop

[rickf]

Later model dampers had 2 notches. One for 6 degrees. One for 30 degrees. Ignition timing is all laid out in TM 9-2320-218-20-1-1. Chapter 4-17.
Pages 4-72 and 4-73 specifically explaining why the 2 notches. I ran across this recently working on a friends A2. I too had not seen this before.
The notches on the A2 were on front and top.

I just read that section and I do not see anything at all about two notches? It simply states to raise rpm and make sure the timing mark advance smoothly away from the pointer and then slowly back as the engine comes back to idle. Nothing at all about two marks. I can clearly see the one mark on his pulley is machined in and the other was put there with a chisel.