400 rebuild distributor orientation - Pontiac GTO Forum
User Tag List

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 12 (permalink) Old 08-16-2012, 04:25 AM Thread Starter
 
SPCMarty's Avatar
 
Join Date: Jul 2011
Location: Duluth MN
Posts: 188
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
400 rebuild distributor orientation

May sound like a dumb question, but I've got my rebuilt engine sitting at #1 TDC but I don't quite know where to rotate/orientate the points style distributor.
I followed my rebuild by the book and installed the timing gears with the crank at the 12 o-clock and the cam at 6 o-clock. Since I'm at #1 TDC I should be setting the distributor to the #1 cylinder as usual correct?


B. Co. 1-22 Infantry 4th Infantry Division OIF 2008-09

1971 LeMans 350ci 2Barrel Carb

B. Co 1-22 4ID OIF 2008-09
SPCMarty is offline  
Sponsored Links
Advertisement
 
post #2 of 12 (permalink) Old 08-16-2012, 08:01 AM
Super Moderator
 
BearGFR's Avatar
 
Join Date: Aug 2008
Location: Springtown, TX
Posts: 5,742
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 122 Post(s)
Garage
Maybe. Are you at TDC compression or TDC exhaust?

Bear

BearGFR
Springtown, TEXAS
BearGFR is offline  
post #3 of 12 (permalink) Old 08-16-2012, 12:37 PM
 
lars's Avatar
 
Join Date: Sep 2004
Posts: 445
Mentioned: 0 Post(s)
Tagged: 1 Thread(s)
Quoted: 1 Post(s)
If you set it up so that the crank gear dot is at 12 o-clock and the cam is at 6 o-clock, you're on the exhaust stroke. Put both dots straight up, and you'll be on compression.

Lars
lars is offline  
 
post #4 of 12 (permalink) Old 08-16-2012, 02:55 PM Thread Starter
 
SPCMarty's Avatar
 
Join Date: Jul 2011
Location: Duluth MN
Posts: 188
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
It's at TDC compression I believe, I watched the cam rotate and the intake valve closed.
According to the book (rocky rotella's rebuilding book) I can set up the time at 12 and 6 if I set it ignition timing to the #6 cylinder, but I'm wondering if I must set it to #6 even if I've rotated it around to #1 TDC.

It seems like, as long as I rotate the engine around to #1 TDC the marks will both be at the 12 anyway and I can ignition time at #1. I'm wondering how the distributor should be facing to be at #1

B. Co. 1-22 Infantry 4th Infantry Division OIF 2008-09

1971 LeMans 350ci 2Barrel Carb

B. Co 1-22 4ID OIF 2008-09
SPCMarty is offline  
post #5 of 12 (permalink) Old 08-16-2012, 03:41 PM
Super Moderator
 
BearGFR's Avatar
 
Join Date: Aug 2008
Location: Springtown, TX
Posts: 5,742
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 122 Post(s)
Garage
Well, with the engine at TDC compression on #1 cylinder, the tip of the rotor in the distributor needs to be pointing to the terminal on the cap where you connect the wire to #1 spark plug.

Bear

BearGFR
Springtown, TEXAS
BearGFR is offline  
post #6 of 12 (permalink) Old 08-16-2012, 05:18 PM Thread Starter
 
SPCMarty's Avatar
 
Join Date: Jul 2011
Location: Duluth MN
Posts: 188
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Where is that on the distributor? I don't have a cap with a #1 indicator, and the distributor isn't clamped in place yet.


Off topic Q? Anyone know the thread size on valley pan bolts by any chance? Mine disappeared.

B. Co. 1-22 Infantry 4th Infantry Division OIF 2008-09

1971 LeMans 350ci 2Barrel Carb

B. Co 1-22 4ID OIF 2008-09
SPCMarty is offline  
post #7 of 12 (permalink) Old 08-16-2012, 07:14 PM
 
the65gto's Avatar
 
Join Date: Oct 2008
Location: Florida
Posts: 344
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
This is such a anti-technical method (requires no batteries) I hate to write it. But, I have always been able to figure it out or confirm it, with a piece of toilet paper With the coil unplugged, and #1 spark plug removed, place a piece of toilet paper in the spark plug hole. When you rotate the engine and it is on compression stroke, it will blow the paper out of the hole.

Last edited by the65gto; 08-16-2012 at 07:42 PM.
the65gto is offline  
post #8 of 12 (permalink) Old 08-16-2012, 07:18 PM Thread Starter
 
SPCMarty's Avatar
 
Join Date: Jul 2011
Location: Duluth MN
Posts: 188
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
That's an outstanding method. I'm quite certain my engine is at #1 TDC compression. All I'm trying to do is orient the distributor that has no cap or markings for the #1 cyl.
And find the thread size for the valley pan bolts lol


B. Co. 1-22 Infantry 4th Infantry Division OIF 2008-09

1971 LeMans 350ci 2Barrel Carb

B. Co 1-22 4ID OIF 2008-09
SPCMarty is offline  
post #9 of 12 (permalink) Old 08-16-2012, 07:33 PM
 
the65gto's Avatar
 
Join Date: Oct 2008
Location: Florida
Posts: 344
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Usually, my #1 position is pointing at the battery. If it is on the compression stroke and is at the TDC mark, the rotor should point that direction. You may have to remove the distributor, rotate the oil pump shaft to make that happen. When the distro is in place, rotor pointing at the battery, that is the place to install the spark plug wire going to #1 cylinder. 18436572 CCW Never seen that marked anywhere as #1.
the65gto is offline  
post #10 of 12 (permalink) Old 08-16-2012, 10:43 PM
Super Moderator
 
BearGFR's Avatar
 
Join Date: Aug 2008
Location: Springtown, TX
Posts: 5,742
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 122 Post(s)
Garage
If you want to orient it the same way the factory did, then insert your distributor so that with your engine at TDC #1 compression the rotor is pointing between 12 o'clock and 1 o'clock (12 o'clock is directly at the firewall, 6 o'clock is directly at the front bumper). Make sure the distributor is fully seated down against the block. You may have to fiddle with it and/or take a long flat blade screwdriver and turn the oil pump drive shaft down inside the block so that it lines up with the tang on the distributor. The vacuum canister should point towards 3 o'clock (drivers side fender). Wire the distributor cap accordingly from there (counter-clockwise in firing order sequence 1 8 4 3 6 5 7 2). That's only if you want to orient everything the way the factory did it. In actual practice, with the motor again at TDC compression #1, just plop the distributor in (make sure it's fully seated all the way down onto the block). Whichever terminal the rotor happens to be pointing to is now #1. Connect #1 plug wire to that terminal, then again--- work your way around clockwise in firing order sequence 1 8 4 3 6 5 7 2.

Bear

BearGFR
Springtown, TEXAS
BearGFR is offline  
Sponsored Links
Advertisement
 
Reply

  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO Complete Engine Compartment Discussion

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Pontiac GTO Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Installing Distributor Sloan66 1964-1974 Tempest, LeMans & GTO Technical and Electrical Wiring 5 04-06-2011 06:57 PM
distributor Chris-Austria 1964-1974 Tempest, LeMans & GTO Technical and Electrical Wiring 18 02-23-2011 02:39 PM
Engine orientation questions Eric Animal 1964-1974 Tempest, Lemans & GTO Complete Engine Compartment Discussion 12 01-24-2011 07:17 PM
Distributor gear 70gto 1964-1974 Tempest, LeMans & GTO Technical and Electrical Wiring 2 05-02-2008 11:54 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome