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Allis Chalmers Discussion Forum

D17 Valve Tappet Gap

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05-01-2020 16:55:38

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Good Evening,
I'm trying to set the valve tappet gap on our D17 Series 3 Gas burner. My book shows that I should move the #1 cylinder to TDC and set the gaps on valves 1,2,4,& 6. Then set the #4 piston to TDC and set the gaps on valves 3,5,7,&8. First question - confirming the cylinder numbers start with #1 closest to the radiator and move towards the steering wheel 1,2,3,4. Second Question - It appears to me that the #1 & #4 cylinder are both at TDC at the same time? I am unable to set the gap on valve #3 & #5 as there is no gap even with the screw backed all the way out. That's making me think I'm making a mistake.

Thank you!

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05-01-2020 17:14:58

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 Re: D17 Valve Tappet Gap in reply to Trevor68, 05-01-2020 16:55:38  
#1 is at the radiator and #4 is at the rear. Remove all four spark plugs. With a tight fan belt, turn the engine over by hand pulling on the top of the fan while standing on the generator side. Turn the engine over until the setscrew on the crankshaft pulley is straight DOWN. This is TDC on #1 and #4 at the same time. If the tappets on #1 are both loose, great !! If they are not, turn the engine one full turn more until the setscrew is straight DOWN (that means 6 o'clock straight down ). With both #1 tappets loose, adjust to .015" with the engine cold. Now turn the engine 1/2 turn until the setscrew is straight UP. Now adjust the tappets on #2 cylinder. Once more turn the engine 1/2 turn setscrew DOWN at 6 o'clock and adjust tappets on #4 cylinder. Now one more 1/2 turn til setscrew is straight UP and adjust #3. You are done.

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05-02-2020 07:31:22

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 Re: D17 Valve Tappet Gap in reply to DrAllis, 05-01-2020 17:14:58  
Thank you so much for such a detailed reply. My son is restoring this tractor for his FFA project. We are not mechanics but are learning as we go. I was able to print your reply and he set the tappet gaps this morning. He went from a tractor that had very little compression to having good compression on all cylinders. He put the carb he rebuilt and the exhaust back on and it tried to fire up for the first time in over 7 years. This site has been a great resource for us.

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