 How to determine EXACTLY where TDC is?, Valve adjustment advice needed |
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| JeffBowlsby |
 May 2 2010, 10:34 AM
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#1
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914 Wiring Harnesses  Group: Members Posts: 8,724 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None 
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Eyeballing alignment of the rotor to the tick mark on the dizzy body seems so imprecise...for adjusting valves. Is there a method of locating TDC for each cyl PRECISELY?
1. I thought about making some kind of rotor replacement device with a pointer that could extend down close to the tick mark, but thats only good for cyl 1. All cylinders needed. 2. I thought about making a special trigger point plug adapter with three long wires, and attaching it to me DVM on the buzzer setting. When the trigger points would make contact, then that would indicate...? I am not sure that the trigger points make contact at TDC, I think it is at some different point in the cycle. Any time proven methods? |
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| McMark |
May 2 2010, 10:35 PM
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#2
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
Okay, since Dave upped the ante: (IMG:style_emoticons/default/poke.gif)
You should confirm the zero TDC mark by pulling a spark plug and looking into the cylinder with a flash light. You can see the piston as it moves up the cylinder and can visually identify TDC. Then check your fan to make sure the TDC mark corresponds. THEN you can move on. (IMG:style_emoticons/default/tongue.gif) |
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| ConeDodger |
May 9 2010, 10:55 PM
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#3
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Apex killer! Group: Members Posts: 23,802 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California
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QUOTE(McMark @ May 2 2010, 08:35 PM)  Okay, since Dave upped the ante: (IMG:style_emoticons/default/poke.gif) You should confirm the zero TDC mark by pulling a spark plug and looking into the cylinder with a flash light. You can see the piston as it moves up the cylinder and can visually identify TDC. Then check your fan to make sure the TDC mark corresponds. THEN you can move on. (IMG:style_emoticons/default/tongue.gif) Or, better still - buy or borrow a bore-scope. |
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Posts in this topic
Jeff Bowlsby How to determine EXACTLY where TDC is? May 2 2010, 10:34 AM
Tom Jeff,
From reading posts on here, it seems to... May 2 2010, 11:02 AM Vacca Rabite Toms right. Due to the cam layout of our cars (th... May 2 2010, 11:06 AM Gint No it isn't more important to do it that way. ... May 2 2010, 11:16 AM McMark On a running car you can use the rotor to determin... May 2 2010, 11:35 AM
realred914
On a running car you can use the rotor to determi... May 10 2010, 08:29 AM JRust
how can you view the rotor when teh car is runnin... May 10 2010, 08:36 AM URY914 I found this picture somewhere and thought someone... May 2 2010, 02:12 PM r_towle Jeff, I can get you onto two.
Via the timing hole... May 2 2010, 05:19 PM Dave_Darling
Then, if your so inclined...remove the engine and... May 2 2010, 10:28 PM ClayPerrine Just do this the easy way.....
Take off BOTH valv... May 2 2010, 05:41 PM avidfanjpl And my 2.0 is so early an engine it has a red mark... May 2 2010, 10:36 PM Cap'n Krusty Unless you have a VERY unusual fan, there's al... May 2 2010, 10:40 PM charliew My experience is with t1 bugs. It was always real ... May 3 2010, 10:28 AM JRust So when you have top dead center on #1 & have ... May 9 2010, 10:49 PM McMark Yup, when the #1 cylinder at TDC on the compressio... May 9 2010, 11:01 PM JRust Okay here are a couple pics. I believe I am at TDC... May 9 2010, 11:34 PM avidfanjpl Just went through this too. Steve Gaglione set me ... May 9 2010, 11:42 PM realred914 for adjusting valves you dont need to be very perc... May 10 2010, 08:34 AM jimkelly pic May 10 2010, 08:47 AM realred914
pic
Gawd, that is horribly complicated. just... May 10 2010, 09:50 AM JRust What I am not seeing is how I adjust the distribut... May 10 2010, 08:51 AM realred914
What I am not seeing is how I adjust the distribu... May 10 2010, 09:54 AM McMark
What I am not seeing is how I adjust the distribu... May 10 2010, 10:07 AM SLITS
What I am not seeing is how I adjust the distrib... May 10 2010, 10:39 AM ClayPerrine
Just to make it more confusing ......
The distr... May 10 2010, 10:49 AM vsg914 Dang, there are a lot of different ways to find td... May 10 2010, 10:30 AM JRust
Dang, there are a lot of different ways to find t... May 10 2010, 10:33 AM JRust Okay so I am not off 180 degrees. I am off somewhe... May 10 2010, 10:30 AM vsg914 Cool. I haven't seen a rev liming rotor in man... May 10 2010, 10:39 AM vsg914 I agree with Slits. Seen more than one car with pl... May 10 2010, 10:44 AM McMark Ignore where your rotor is pointing. It's irr... May 10 2010, 10:46 AM McMark Your rotor is pointing at the line in the distribu... May 10 2010, 10:50 AM JRust
Your rotor is pointing at the line in the distrib... May 10 2010, 12:21 PM ClayPerrine
Whats with the rev limiting rotor? Any benefits t... May 10 2010, 02:10 PM underthetire One way to find TDC on # 1 is remove a plug, place... May 10 2010, 10:51 AM vsg914
One way to find TDC on # 1 is remove a plug, plac... May 10 2010, 11:40 AM McMark The rev-limiting rotor has a weight that will disc... May 10 2010, 01:01 PM |
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