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Case Tractors Discussion Forum
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Dist. timing rotor location

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BobV

02-14-2005 06:59:14




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I'm tring to solve the position of the rotor on a 400B I have three manuals,a copy of the J.I.Case service manual & I&T Manual & the operators manual none of these shows where the rotor points at TDC. The dist. is in the motor and when #1 is at the top and the cam&crank marks are matched the rotor points to the back or towards the flywheel I think its 180 out some help would be appreciated.




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BobV

02-15-2005 06:23:13




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 Re: Dist. timing rotor location in reply to BobV, 02-14-2005 06:59:14  
Thanks to all of you for the response to my question on dist. timing. I read the discussion group for Case everyday and I have learned so much, thanks to YTMag also for this web site.



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Joe (Wa)

02-14-2005 12:08:12




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 Re: Dist. timing rotor location in reply to BobV, 02-14-2005 06:59:14  
Bob, The crankshaft makes 2 revolutions while the distributor rotor is making 1 rev so the timing mark will line up with the pointer either when #1 or #4 is TDC on the compression stroke.

The engine can be correctly timed with the rotor pointing ballpark @ 12, 9, 6, or 3 o'clock provided the #1 cylinder is TDC on the compression stroke and the firing order is in sequence.

Having said that, the factory �distributor attitude� of most older engines is to install the distributor so the rotor is under the tower that is nearest in a straight line to the #1 spark plug and that will be ballpark 3 o�clock on this engine.

The distributor drive gear is helical so when installing with #1 TDC on the compression stroke, start the gear mesh with the rotor between 1 & 2 o�clock. When the drive gear is in full mesh the rotor will have turned CW to ballpark 3 o�clock. Turn the distributor head until the points are just opening in the CW direction and the rotor is still under the #1 wire tower terminal. Install the remaining plug wires in firing order CW. That will be close to spark @ 0� TDC. You probably need BTDC, so use a timing light to tweak it in.

Joe

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DKase

02-14-2005 07:26:12




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 Re: Dist. timing rotor location in reply to BobV, 02-14-2005 06:59:14  
Make sure you are on the compression stroke! If you are on the exhaust stroke it would be 180 degrees off.



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dctom

02-14-2005 07:24:02




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 Re: Dist. timing rotor location in reply to BobV, 02-14-2005 06:59:14  
sounds right 180 out pull dis and move 180 ahead



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