 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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| r_towle |
May 2 2010, 05:19 PM
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#2
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Custom Member Group: Members Posts: 24,638 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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Jeff, I can get you onto two.
Via the timing hole in the fan housing, you see the notch at #1 TDC Crawl underneath and mark the lower window at the flywheel to mark number 3... Then, if your so inclined...remove the engine and divide the two marks to get two more... Rich |
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| Dave_Darling |
May 2 2010, 10:28 PM
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#3
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914 Idiot Group: Members Posts: 15,053 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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QUOTE(r_towle @ May 2 2010, 04:19 PM)  Then, if your so inclined...remove the engine and divide the two marks to get two more... Nope, the crank goes through TWO rotations when the cam (and distributor) go through one. So the two marks on the flywheel or fan are all you need, one of them will always be TDC for both #1 and #3, the other will be TDC for #2 and #4. BTW, it appears that the fans can be off slightly from example to example. The ignition Tech Article on Pelican's site shows two fans that are slightly off from each other. I would trust the flywheel mark before the fan markings. But it isn't generally necessary to be right exactly on TDC when you're using the TDC method for valve adjusting. And it isn't necessary at all if you use the opposite-rocking method... --DD |
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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 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 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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