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Timing Issues
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Timing Issues
Hi all, I'm new to the forum. I bought a 1958 lo boy and have it pretty much back together but I'm having trouble finding TDC. Everywhere I read says look for a notch on the pulley, but unfortunately I don't see one. Any suggestions?
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Re: Timing Issues
Take a wire brush to the pulley. If the notches are present they are probably filled up with crud.
The key way in the crankshaft is at 12 O-clock, #1 and #4 cylinder at TDC. Roll the engine over until the key way is straight up, then using the pointer, mark the pulley.
The key way in the crankshaft is at 12 O-clock, #1 and #4 cylinder at TDC. Roll the engine over until the key way is straight up, then using the pointer, mark the pulley.
I have an excuse. CRS.
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Re: Timing Issues
You should have two notches. When you rotate the engine the first one you see at the pointer is the full advance and the second one is TDC
Once you find the notches I use red and white paint pens or red and white nail polish (dollar store) to color the notch red and the area next to the notches white to make them easier to see when timing.
Once you find the notches I use red and white paint pens or red and white nail polish (dollar store) to color the notch red and the area next to the notches white to make them easier to see when timing.
When you only have 9 horsepower you need to know the names of all of the ponies!
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Re: Timing Issues
inairam wrote:You should have two notches. When you rotate the engine the first one you see at the pointer is the full advance and the second one is TDC
Once you find the notches I use red and white paint pens or red and white nail polish (dollar store) to color the notch red and the area next to the notches white to make them easier to see when timing.
Some aftermarket ones had no marks, some cubs had one mark, and then the rest have two. His should have two, but no telling what’s been done to it in the past.
Thomas
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Re: Timing Issues
If you can't find any reference marks, remove the spark plugs, remove the valve cover and rotate the CS until both valves on #1 cyl are closed. You can place a finger over the #1 hole and as the piston is on the up stroke you can feel the compression increase. Insert a wire/small screwdriver/plastic soda straw etc and you can determine when the piston is at the top. That will be #1 on TDC Compression stroke. Some folks here have written about using a cork or rubber stopper which will pop out or a balloon which will inflate when pressure builds on the compression stroke. My personal favorite is when the #1 piston is at or near the top, with the valves closed add enough MM Oil or other lubricant and slowly rotate the CS. You can see the liquid level rise and fall as the piston moves and easily determine the TDC,
Stan in LA (lower AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)
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Re: Timing Issues
Hi,
Welcome to the website.
Below is a page from the Cub service manual showing the 2 marks that a 1958 LoBoy should have had. They are talking about another subject on the page.
The timing should be set to mark number 1 in the pic when the engine is running at low idle speed, which is 500 RPM. It advances gradually as you speed it up, until it is up to mark 2 at full speed, 2000 RPM.
http://www.farmallcub.info/manuals/gss- ... 001-43.jpg
Welcome to the website.
Below is a page from the Cub service manual showing the 2 marks that a 1958 LoBoy should have had. They are talking about another subject on the page.
The timing should be set to mark number 1 in the pic when the engine is running at low idle speed, which is 500 RPM. It advances gradually as you speed it up, until it is up to mark 2 at full speed, 2000 RPM.
http://www.farmallcub.info/manuals/gss- ... 001-43.jpg
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Re: Timing Issues
Thanks All, I'm at TDC and the rotor is at 1 o'clock, I have spark and fuel but still wont fire....not even a pop on any of the cylinders. I did learn that the gear housing that connects to the distributor was removed at some point and may not have been installed properly. Is there a procedure for that?
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Re: Timing Issues
Do you have compression on all 4 cylinders?
You could be at TDC, #4 cylinder, or 180 degrees out of time.
Finger in the #1 cylinder, someone slowly hand crank over engine until compression felt. Line up pointer and 2nd mark to pass the pointer.
Mark the distributor housing where the #1 cylinder plug wire in the cap is located. Rotor pointing to the mark. Install the distributor in center of the adjustment limits. May take a couple of times to get the distributor/rotor timed correctly.
Once you get the rotor/distributor correctly installed, static time the ignition system.
You could be at TDC, #4 cylinder, or 180 degrees out of time.
Finger in the #1 cylinder, someone slowly hand crank over engine until compression felt. Line up pointer and 2nd mark to pass the pointer.
Mark the distributor housing where the #1 cylinder plug wire in the cap is located. Rotor pointing to the mark. Install the distributor in center of the adjustment limits. May take a couple of times to get the distributor/rotor timed correctly.
Once you get the rotor/distributor correctly installed, static time the ignition system.
I have an excuse. CRS.
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Re: Timing Issues
Thanks Eugene, I've done that procedure, so I think I have the correct phase, but will double check. I did not do a compression check and I'm afraid that's my problem.
Rob
Rob
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