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Location: Kansas
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68S cam timing ? for Warren or Grady
Finally got a dial indicator to check the cam timing on my 68S. Here's what I found. With tension on the timing chain idler arm I have a measurement of .170. Without tension on the arm I have a measurement of .180. The chain tensioners do not look to be "fully" extended. They will move out about 1/8". Is this normal?
From the specs I have the cam timing appears to be quite a ways off. The range should be 0.197-0.213 with a preferred setting of 0.205. My engine is a 901/02 and the engine number is 9525. Going to order the tools to change the timing, any tips to make the job easier? |
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07-17-2005, 09:50 AM
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Bump
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07-18-2005, 02:46 AM
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bump
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07-18-2005, 04:39 PM
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Location: Marysville Wa.
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post the metric reading. US readings just confuse us. by the spec book, it's 5.00mm to 5.40mm, with a happy medium of 5.20mm.
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 Last edited by john walker's workshop; 07-18-2005 at 05:06 PM.. |
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07-18-2005, 05:02 PM
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up-fixing der car(ma)
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What JW says...
in metric, you are at ~4.32mm now.
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Scott Kinder kindersport @ gmail.com |
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07-18-2005, 05:09 PM
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Sorry, the dial indicator I have isn't metric. What do you guys think about the chain tensioners, is it normal for them to not be fully extended?
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07-18-2005, 07:23 PM
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Use a conversion factor:
24.5 mm = 1 inch. 1 mm = .0393" Tensioners should be fully extended and "hard". If not, they need rebuilding (self-contained type) or some oil pressure (pressurized type) without air. Sherwood |
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07-18-2005, 11:48 PM
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Warren Hall Student
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Quote:
Overlap is usually done with a solid tensioner or a C-clamp. In otherwords no slack. This is different than in running condition where you need some give in the tensioning.
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Bobby _____In memoriam_____ Warren Hall 1950 - 2008 _____"Early_S_Man"_____ |
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07-19-2005, 12:37 AM
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Sherwood!
25.4
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07-19-2005, 05:43 AM
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see, it's confusing.
the tensioner will only extend as far as the chain lets it. so with new chains and sprockets, what you have is normal, as long as all the slack is out of the chain.
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07-19-2005, 06:54 AM
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So when the engine is running does the chain tighten up? It looks like you would want to time it with whatever tension is on the chain from the chain tensioner. If you time it with a c-clamp on the idler arm and then take the clamp off the reading from the dial indicator is going to change.
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07-19-2005, 07:56 AM
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25.4
25.4 25.4 Hi John, Thanks for correcting my lysdexia and bad memory. Next time, I'll double check my specs. I hope RMartin wasn't paying attention to me. RMartin, BTW, when the engine is running, with either type of tensioner, the shaft should be quite rigid. If you can compress it with finger pressure or equivalent (engine OFF), something's wrong. Sherwood |
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07-19-2005, 08:23 AM
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73' Porsche Targa
