 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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| JRust |
May 10 2010, 08:51 AM
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#2
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914 Guru Group: Members Posts: 6,310 Joined: 10-January 03 From: Corvallis Oregon Member No.: 129 Region Association: Pacific Northwest
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What I am not seeing is how I adjust the distributor to get my rotor pointed where it is supposed to be? I have top dead center & have my timing mark in the hole. How do I get my rotor to the right position (IMG:style_emoticons/default/confused24.gif)
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| McMark |
May 10 2010, 10:07 AM
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#3
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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 |
QUOTE(JRust @ May 10 2010, 07:51 AM)  What I am not seeing is how I adjust the distributor to get my rotor pointed where it is supposed to be? I have top dead center & have my timing mark in the hole. How do I get my rotor to the right position (IMG:style_emoticons/default/confused24.gif) You don't change the rotor position, you change the orientation of the distributor body. Loosening this with a 10mm wrench will allow the body to rotate. If your distributor drive gear was put in correctly, your distributor is pretty close to right. Probably close enough to start. I can talk your ear off about all the 'philosophy' of distributor orientation at WCR. Attached image(s) 
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| SLITS |
May 10 2010, 10:39 AM
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#4
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
QUOTE(McMark @ May 10 2010, 09:07 AM) QUOTE(JRust @ May 10 2010, 07:51 AM) What I am not seeing is how I adjust the distributor to get my rotor pointed where it is supposed to be? I have top dead center & have my timing mark in the hole. How do I get my rotor to the right position (IMG:style_emoticons/default/confused24.gif) You don't change the rotor position, you change the orientation of the distributor body. Loosening this with a 10mm wrench will allow the body to rotate. If your distributor drive gear was put in correctly, your distributor is pretty close to right. Probably close enough to start. I can talk your ear off about all the 'philosophy' of distributor orientation at WCR. Just to make it more confusing ...... The distributor does not give a crap where it is as long as you have enough "swing" to get the advance you want. What the engine does care is that the #1 high tension wire, pole on cap and the rotor are in alignment plus the firing order is correct. Moving high tension leads can account for a misaligned distributor drive gear. |
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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 McMark Okay, since Dave upped the ante: :poke:
You shou... May 2 2010, 10:35 PM ConeDodger
Okay, since Dave upped the ante: :poke:
You sho... May 9 2010, 10:55 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 realred914
What I am not seeing is how I adjust the distribu... May 10 2010, 09:54 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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