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ALLIS 685-T timming |
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rusty98
Bronze Level Joined: 19 Jan 2015 Location: doylestown Pa Points: 10 |
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Posted: 19 Jan 2015 at 6:23pm |
I HAVE A ALLIS 685T need to know how to find number 1 cylinder and top dead center of number 1 cylinder in order to install newly rebuilt injector pump. motor is a 685-t from 1980
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JohnCO
Orange Level Joined: 11 Sep 2009 Location: Niwot Colo Points: 8992 |
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#1 is the closest one to the water pump. If you have the valve cover off, turn the engine over with a wrench until the timing mark shows on front pulley, it can be off 180 degrees so you need to watch the valves when the intake valve is closing, the pointer should be right at the mark. Good luck!
Edited by JohnCO - 19 Jan 2015 at 11:39pm |
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"If at first you don't succeed, get a bigger hammer"
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rusty98
Bronze Level Joined: 19 Jan 2015 Location: doylestown Pa Points: 10 |
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Thanks for your input
I am an electrician trying to twist wrenches ! I am familiar with timming marks on the pulley in cars and trucks, But this allis chalmers 685-T I can't find anything. I looked hi and low. The injection pump was changed about 10 years ago and from what I can tell the valve cover closet to the water pump was not removed all the paint on the bolts is intact but the opposite end away from the water pump that valve cover was removed. That is why I wanted to clearify the number 1 cylinder.
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Lazyts
Orange Level Joined: 05 Feb 2012 Location: Manitoba Points: 627 |
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The firing order on these 6's is 153624, and each cylinder has a "companion" so you can find TDC on any cylinder by taking the valve covers off and watching its companion. For example, when the exhaust valve is just closing, and the intake valve is starting to open on #6, #1 is at TDC. (this is called overlap) The valves on any cylinder can be adjusted this way- turning the engine over and watching the companion cylinder, because you know that when one is finished its exhaust stroke, its companion will be finished compression.
The timing marks should be visible on the flywheel through a small cover on injection pump side of flywheel housing- flywheel should be marked with degree lines, pump will probably be timed around 30 degrees BTDC (before top dead center). Retarding the timing slightly will make for easier starting, advancing the timing will make more power. Most 11000 engines were timed between 28 and 32 degrees BTDC. |
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JohnCO
Orange Level Joined: 11 Sep 2009 Location: Niwot Colo Points: 8992 |
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Rusty, sorry for the mis information, should have gone and looked before saying it was on the front pulley. Lazy has a lot of good info.
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"If at first you don't succeed, get a bigger hammer"
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rusty98
Bronze Level Joined: 19 Jan 2015 Location: doylestown Pa Points: 10 |
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Thank you for the help
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