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F-20-New pushrods. Need specs on adj.

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Russ926

09-28-2007 03:46:23




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Tore the head down and put in a set of new straight pushrods. I dont have a book on my 35 f-20 so id like to see what things need to be set at so i dont bend my new set!
THANKS FOR THE HELP!




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Len Rahilly

09-29-2007 06:01:57




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 Re: F-20-New pushrods. Need specs on adj. in reply to Russ926, 09-28-2007 03:46:23  
Another thought: The rotor in the F-4 magneto is easy to get to, and you can pretty well tell where TDC is by watching the position of the brass contact. Put this together with the position of the crank pin as described in the manual and you might be able to avoid the trouble of pulling a plug, feeling for compression, etc.
Never tried this, however, but you might see if this will work.



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teddy52food

09-28-2007 10:59:13




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 Re: F-20-New pushrods. Need specs on adj. in reply to Russ926, 09-28-2007 03:46:23  
I hope you found and corrected what caused the first set to bend.



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Len Rahilly

09-28-2007 07:16:59




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 Re: F-20-New pushrods. Need specs on adj. in reply to Russ926, 09-28-2007 03:46:23  
Russ: Here are the instructions from my F-20 instruction manual (printed 1939). Clearance of .009" is necessary between end of valve levers and valve stems when valves are closed--when engine is warm.
To determine when valves are closed:
Remove spark plug from No. 1 cylinder. [FRONT]
Place thumb over opening and crank until outward pressure can be felt (#1 piston is moving toward upper dead center of compression stroke). Continue cranking until starting crank pin is in horizontal position. Both valves are then closed on compression stroke of #1 cylinder.
Check or adjust No. 1 valves.
Crank engine 1/2 turn--crank pin horizontal.
Check or adjust #3 valves.
Crank engine 1/2 turn--crank pin horizontal.
Check or adjust #4 valves.
Crank engine 1/2 turn--crank pin horizontal.
Check or adjust #2 valves.
[My note: Firing order is 1-3-4-2]

To adjust valves:
Loosen lock nut.
Adjust screw in valve lever so gauge will snugly slip between end of valve lever and valve stem.
Tighten lock nut and recheck for clearance with gauge.

I presume you've done this before on other engines, and I may be telling you something you already know: the adjustment screw may slip and tighten up the clearance, so be sure to hold the screw while turning the nut down, AND then recheck your clearance. Valve levers too close can hold valves open a little bit during exhaust cycle and cause burning, so having them at the setting called for can be important. A tad loose might not hurt anything.

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Russ926

09-28-2007 17:11:07




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 Re: F-20-New pushrods. Need specs on adj. in reply to Len Rahilly, 09-28-2007 07:16:59  
THANKS LEN. thats what i needed.



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