 Question for Six Engine People, TDC and Z1 mark |
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| Robarabian |
 Mar 15 2023, 08:48 PM
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#1
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914 A Roo  Group: Members Posts: 687 Joined: 11-February 19 From: Simi Valley, Kalifornia Member No.: 22,865 Region Association: Southern California 
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I have a 911 engine I am working on. I am practicing setting cam timing so I can feel comfortable with it prior to the tear down. My Crankshaft pulley has a Z1 mark that has 2 lines. So I have seen 911 pulleys with Z1 and 1 line.
The question de jour is which of the 2 lines at Z1 is TDC? Or are the 2 lines giving me the dwell of where TDC is and if so, where should I put them in relation to the case to set cam timing and do valve adjustments. it looks like " Z | | 1" It is a 2.4 Somebody knows this answer. |
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| Krieger |
Mar 15 2023, 10:33 PM
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#2
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Advanced Member Group: Members Posts: 4,803 Joined: 24-May 04 From: Santa Rosa CA Member No.: 2,104 Region Association: None
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I think the 5° BTDC is the timing mark at idle. It should be to the left of Z1. Put up a picture. Good for you practicing cam timing. It's a good check of your tools and what you may need.
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Posts in this topic
Robarabian Question for Six Engine People Mar 15 2023, 08:48 PM
Robarabian I may have found the answer looking at 50 differen... Mar 15 2023, 08:57 PM targa72e That is correct . 911 of that vintage had vacuum r... Mar 15 2023, 10:33 PM ClayPerrine A suggestion for setting the cam timing.
Only pu... Mar 16 2023, 05:28 AM gereed75 I would emphasize one of Clays comments -put a dia... Mar 16 2023, 09:57 AM 930cabman I would double check with a dial indicator Mar 16 2023, 11:58 AM IronHillRestorations To add confusion the 2.4 and 2.7’s crank is inde... Mar 16 2023, 03:06 PM
Robarabian I was wondering about that. I installed a new flyw... Mar 16 2023, 06:45 PM Robarabian So my pulley actually has the Z1 mark and the seco... Mar 16 2023, 06:43 PM |
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