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#80475 07/26/2007 6:29 PM | Joined: Oct 2003 Posts: 24 Apprentice | | Apprentice Joined: Oct 2003 Posts: 24 | I'm trying to get #1 piston in TDC. Book says to have intake closed then rotate 30 degrees till ball lines up with pointer. I'm doing this by hand. Firing order 1 5 3 6 2 4. Are pistons 1 3 2 TDC at the same time? Because when I have the #1 intake closed it is more like 120 degrees before the ball lines up with the pointer. | | |
#80476 07/26/2007 6:43 PM | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | Rick57,
It seems like you might be making this harder than it needs to be. The assumption will be that the flywheel is installed correctly to indicate TDC with the ball and pointer when it should. If you make this assumption, then when #1 plug is pulled out, a finger is held over the hole and air rushes by as the piston comes to the top of its compression stroke, the ball will become visible in the peep hole, and you can manually pull it to perfect alignment with the pointer.
Does this accomplish what you want or have I missed the thrust of your question.
Stuart | | |
#80477 07/26/2007 6:53 PM | Joined: Mar 2005 Posts: 1,029 Member | | Member Joined: Mar 2005 Posts: 1,029 | Only #1 and #6 are at TDC at the same time, but one of them will be at TDC on the firing stroke and the other will be at the end of the exhaust stroke and the beginning of the intake stroke. 120-140 degrees beyond the closing of the intake valve for #1 TDC on the firing stroke sounds about right to me. | | |
#80478 07/26/2007 7:47 PM | Joined: Feb 2004 Posts: 29,777 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,777 | Take the valve cover off and look at the rocker arms on #6 cylinder. As the exhaust closes and the intake begins to open, #1 will be coming up toward TDC on the compression stroke. Cylinders reach TDC in pairs, 1&6, 2&5, and 3&4. They're just 360 degrees apart in the 4-stroke cycle, one on top of the exhaust stroke, and the other one on TDC of the compression stroke. It's also an excellent way to find TDC for valve adjustment.
Jerry
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#80479 07/27/2007 9:35 PM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | The flywheel is indexed to the crankshaft, so its notch will be dead on.
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