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Sanity Check - TDC and distributor rotor
993
Installed distributor and have rotor pointing at the notch. Intake rocker installed on cylinder #1. Cam Timing stage completed. Just want to confirm I am not 180 degrees out. As the TDC pulley notch approaches the crankcase seam the number one intake valve starts opening. I rotate the pulley 360 degrees and the cam is not acting on the intake rocker (it is at rest). At TDC #1 should the valves be completely closed? Can someone confirm this is the correct combination of events. Just don't want to screw this up and I know this is a common mistake. Thank You! Last edited by Green993; 07-25-2013 at 12:30 PM.. Reason: clarity |
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07-25-2013, 11:29 AM
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Straight shooter
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Yes, #1 should have both valves closed at tdc. Good time to run the plug wires matching the firing order.
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“Of the value traps, the most widespread and pernicious is value rigidity. This is an inability to revalue what one sees because of commitment to previous values. In motorcycle maintenance, you MUST rediscover what you do as you go. Rigid values makes this impossible.” ― Robert M. Pirsig, Zen and the Art of Motorcycle Maintenance: An Inquiry Into Values |
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07-25-2013, 12:40 PM
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Thank You. Just want to be sure!
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07-25-2013, 01:19 PM
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Moderator
Join Date: Dec 2001
Posts: 9,569
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Quote:
You say, "as the TDC pulley notch approaches the crankcase seam the number one intake valve starts opening." The intake valve opens before Overlap TDC, not Compression TDC. If you then rotate 360 degrees, and both valves are closed, you are at Compression TDC, at which point the rotor should be pointing at the notch in the distributor housing. Here is a chart I made to help  I think you are correct, but your first sentence confuses me. There should be no valve opening prior to Compression TDC-- at that point both rockers should have play
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'66 911 #304065 Irischgruen ‘96 993 Carrera 2 Polarsilber '81 R65 Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13) Ex-'88 Carrera (Sold 3/29/02) Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04) Ex-'89 944 Turbo S (Sold 8/21/20) |
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07-25-2013, 05:35 PM
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Registered User
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Upon re-reading that it does seem unclear. It really was an either or: Valves completely closed or approaching the notch with #1 intake opening. I went with valves completely closed.
Here's the next question: When turning the pulley do you turn it clockwise or anti-clockwise? Does it make a difference? |
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07-25-2013, 07:58 PM
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Registered
Join Date: Nov 2000
Location: Dallas
Posts: 3,581
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Facing the pulley always turn clockwise, damage can result going "backwards". I am assuming the 993 is same as my '88 Carrera.
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Buck '88 Coupe, '87 Cab, '88 535i sold, '19 GLC 300 DD Warren Hall, gone but not forgotten |
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07-26-2013, 02:48 PM
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P911
