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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Tappet Adjustment

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Shaun Murray

07-15-2005 05:59:20




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I am setting my tappets for my valves. On my super 88 diesel, do the #1 and #6, #2 and #5, and #3 and #4 pistons have the same travel. Meaning that when #1 is TDC (Top dead center) then #6 is as well. I thought this was the case. I shouldn't have put on the oil pan just yet. However, it is now difficult for me to tell exactly where the stroke of the pistons are at. I want to get the tappets adjusted properly to avoid any damage to the valves or head. I can see #1 and #2 through the primer pump hole. So if my above assumptions are correct, I should be able to easily adjust the tappets. However, I wanted to check with you guys, the experts, before I tried to fire it up.

Thanks in advance,
Shaun

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Wrenchbender

07-15-2005 06:46:33




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 Re: Tappet Adjustment in reply to Shaun Murray, 07-15-2005 05:59:20  
Yes when #1 is at TDC so is #6, but #1 will be on compression and #6 will be at the end of exhaust and the valves will be in overlap. This is the time to adjust the valves on #1 cyl. Turn the crankshaft in the direction of rotation and #2 will next be in overlap, now adjust #5 cyl. Keep going through the firing order adjusting the valves that are on compression.

Hope that's as clear as mud, WB.

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Shaun Murray

07-15-2005 08:15:58




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 Re: Tappet Adjustment in reply to Wrenchbender, 07-15-2005 06:46:33  
Thanks. Do you know what the firing order is on this tractor? When I turn the engine in rotation how far should it be turned before the next set of values are ready for setting? 1/4 turn? A quick dummy question --- when the valves are set shouldn't the push rods be at equal heights?



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J. Schwiebert

07-15-2005 09:31:41




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 Re: Tappet Adjustment in reply to Shaun Murray, 07-15-2005 08:15:58  
Wrenchbender has you going in the right direction. When you have #1 at TDC compression stroke the exhaust valve on number 6 is closing and the intake is opening. Set #1. Make a mark as a reference point on the front pulley. Turn it a third of a full turn(120 degrees. You shoud have #2 on overlap and then set number 5. Make your mark, go the other 1/3 turn watch four and set 3. Then on the next turn do the other have. Always remember with this method and it is a good one the one you are watching and the one you are setting will add up to one more (7) than the number of cylinders in the engine. Valve arrange from the front is E-I-I-E-E-I-I-E-E-I-I-E We always set the mat 10 & 20 cold setting. Warm it up good retorque the head and reset the valves. Questions?

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