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Where are the rotor segment to align with the pointer cast in the distributor base? for a GMC Jimmy 2001

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The mark you are looking for is a thin line on the top edge of the distributor body visable when you remove distributor cap
it is actuall on the top edge where the cap sits

Posted on Jan 04, 2011

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Chevy timing


cam or spark? timing?

my wild guess, is spark.

its in the FSM book

at at alldata.com , every day, 24/7

7.4 L liters.

there are 2 systems used, in 97

DIS (no distributor) DIS means, (distributor-less, Ignition systems)

or

Dizzy engines. with Distrib.

what is yours, the DIS has no timing, its FIXED.



here are the steps on Dizzy

course is first , HV wires set to correct firing order

1-8-4-3-6-5-7



  1. Remove the No. 1 cylinder spark plug.


  2. Turn the engine using a socket wrench on the large bolt on the front of the crankshaft pulley. Place a finger near the No. 1 spark plug hole and turn the crankshaft until the piston reaches Top Dead Center (TDC). As the engine approaches TDC, you will feel air being expelled by the No. 1 cylinder. If the position is not being met, turn the engine another full turn (360 degree). Once the engine\'s position is correct, install the spark plug.


  3. Align the pre-drilled indent hole in the distributor driven gear with the white painted alignment line on the lower portion of the shaft housing.


  4. Using a long screwdriver, align the oil pump drive shaft in the engine in the mating drive tab in the distributor.


  5. Install the distributor in the engine.


  6. When the distributor is fully seated, the rotor segment should be aligned with the pointer cast in the distributor base. The pointer will have a "6" or "8" cast into it indicating a 6 or 8-cylinder engine. If the rotor segment is not within a few degrees of the pointer, the distributor gear may be off a tooth or more. If this is the case repeat the process until the rotor aligns with the pointer.


  7. Install the cap and fasten the mounting screws.


  8. Install the hold-down clamp and bolt, then tighten the bolt to 20 ft. lbs. (27 Nm).


  9. Engage the electrical connections and the spark plug wires.




fine tuning with timing light is next.


HEI Systems


  1. Start the engine and allow it to reach operating temperature. Stop the engine and connect the timing light to the No. 1 (left front) spark plug wire, at the plug or at the distributor cap. You can also use the No. 6 wire, if it is more convenient. Numbering is illustrated in this section.


Do not pierce the plug wire insulation with HEI; it will cause a miss. The best method is an inductive pickup timing light.



  1. Clean off the timing marks and mark the pulley or damper notch and timing scale with white chalk.


  2. Disconnect and plug the vacuum line at the distributor on models with a carburetor. This is done to prevent any distributor vacuum advance. On fuel injected models, disengage the timing connector which comes out of the harness conduit next to the distributor, this will put the system in the bypass mode. Check the under hood emission sticker for any other hoses or wires which may need to be disconnected.


  3. Start the engine and adjust the idle speed to that specified on the Underhood Emissions label. With automatic transmission, set the specified idle speed in Park. It will be too high, since it is normally (in most cases) adjusted in Drive. You can disconnect the idle solenoid, if any, to get the speed down. Otherwise, adjust the idle speed screw.


The tachometer connects to the TACH terminal on the distributor and to a ground on models with a carburetor. On models with fuel injection, the tachometer connects to the TACH terminal on the ignition coil. Some tachometers must connect to the TACH terminal and to the positive battery terminal. Some tachometers won\'t work with HEI.

4:



  1. Aim the timing light at the pointer marks. Be careful not to touch the fan, because it may appear to be standing still. If the pulley or damper notch isn\'t aligned with the proper timing mark (see the Underhood Emissions label), the timing will have to be adjusted.


TDC or Top Dead Center corresponds to 0degB, or BTDC, or Before Top Dead Center may be shown as BEFORE. A, or ATDC, or After Top Dead Center may be shown as AFTER.



  1. Loosen the distributor base clamp locknut. You can buy trick wrenches which make this task a lot easier.


  2. Turn the distributor slowly to adjust the timing, holding it by the body and not the cap. Turn the distributor in the direction of rotor rotation to retard, and against the direction of rotation to advance.


  3. Tighten the locknut. Check the timing again, in case the distributor moved slightly as you tightened it.


  4. Reinstall the distributor vacuum line or the timing connector. Correct the idle speed.


  5. Stop the engine and disconnect the timing light.




end,



DIS or not DIS< the question???????????????????????

Jul 03, 2014 | 1997 Chevrolet C3500

1 Answer

2001 gmc jimmy acceleration problems


Have you checked base fuel pressure at the injectors ?
Base fuel pressure when cranking or at idle should be at least 60psi or more.

May 14, 2013 | 2001 GMC Jimmy

1 Answer

2001 GMC Jimmy,left rear pads were stuck against the rotor


Either a bad caliper or wheel cylinder. In the majority of the cases, the cylinder is to blame. But if you want to be safe, replace both to cover your bases.

Apr 29, 2012 | 2001 GMC Jimmy

1 Answer

REMOVE DISTRIBUTOR FOR A 1996 GMC JIMMY


Check this procedure...
  1. Disconnect the negative battery cable.
  2. If necessary, remove the air cleaner.
  3. Tag and remove the spark plug wires and the coil leads from the distributor.
  4. Unplug the electrical connector at the base of the distributor.
  5. Loosen the distributor cap fasteners and remove the cap.
  6. Using a marker, matchmark the rotor-to-housing and housing-to-engine block positions so that they can be matched during installation.
  7. Loosen and remove the distributor hold-down bolt.
  8. Remove the distributor from the engine.

INSTALLATION
Engine Not Disturbed
  1. Install the distributor in the engine making sure that the matchmarks are properly aligned.
  2. Install the hold-down bolt and tighten the bolt to 20 ft. lbs. (27 Nm).
  3. Install the distributor cap and attach the electrical connector at the base of the distributor.
  4. Install the spark plug wires and coil leads.
  5. If removed, install the air cleaner assembly.
  6. Connect the negative battery cable.
Engine Disturbed
(see Figure)
  1. Remove the No. 1 cylinder spark plug. Turn the engine using a socket wrench on the large bolt on the front of the crankshaft pulley. Place a finger near the No. 1 spark plug hole and turn the crankshaft until the piston reaches Top Dead Center (TDC). As the engine approaches TDC, you will feel air being expelled by the No. 1 cylinder. If the position is not being met, turn the engine another full turn (360 degree). Once the engine's position is correct, install the spark plug.
  2. Using a long screwdriver, align the oil pump drive shaft in the engine in the mating drive tab in the distributor.
  3. Install the distributor in the engine.
  4. Install the distributor in the engine making sure that the matchmarks are properly aligned.
  5. Install the hold-down bolt and tighten the bolt to 20 ft. lbs. (27 Nm).
  6. Install the distributor cap and attach the electrical connector at the base of the distributor.
  7. Install the spark plug wires and coil leads.
  8. If removed, install the air cleaner assembly.
  9. Connect the negative battery cable.
zjlimited_765.gif

Fig. : The rotor segment should be aligned with the pointer cast in the distributor base, when the distributor is fully seated



Hope this helps (remember to rating this free asnwer).

Oct 07, 2011 | 1996 GMC Jimmy

3 Answers

I changed the distributor drive gear and i am trying to get the TDC firing position on my 1997 chevy astro van 4.3 and there is only one arrow on the block and two lines on the crank shaft how do get it to...


Hi, the procedure is pasted below. Ignore the timing marks and just verify you are at TDC of the compression stroke on the #1 piston. You can tell compression versus exhaust stroke by plugging the spark plug hole with your thumb while turning the crankshaft (there will be no pressure on the exhaust stroke). Please let me know if you have more questions, and thanks for using FixYa.


Timing Disturbed
  1. Remove the No. 1 cylinder spark plug. Turn the engine using a socket wrench on the large bolt on the front of the crankshaft pulley. Place a finger near the No. 1 spark plug hole and turn the crankshaft until the piston reaches Top Dead Center (TDC). As the engine approaches TDC, you will feel air being expelled by the No. 1 cylinder. If the position is not being met, turn the engine another full turn (360 degree). Once the engine position is correct, install the spark plug.
  2. Align the cast arrow in the distributor housing, the driven gear roll pin and the pre-drilled indent hole in the distributor driven gear. If the driven gear is installed correctly, the dimple will be approximately 180° opposite the rotor segment when it is installed in the distributor.
    NOTE Installing the distributor 180° out of alignment, or locating the rotor in the wrong holes, may cause a no start condition or can cause premature engine damage and wear.
  3. Make sure the rotor is pointing to the cap hold-down mount nearest the flat side of the housing.
  4. Using a long screwdriver, align the oil pump drive shaft in the engine in the mating drive tab in the distributor.
  5. Install the distributor in the engine. Make sure the spark plug towers are perpendicular to the centerline of the engine.
  6. When the distributor is fully seated, the rotor segment should be aligned with the pointer cast in the distributor base. The pointer will have a -6'' cast into it indicating a 6 cylinder engine. If the rotor segment is not within a few degrees of the pointer, the distributor gear may be off a tooth or more. If this is the case repeat the process until the rotor aligns with the pointer.
  7. Install the cap and fasten the mounting screws.
  8. Tighten the distributor mounting bolt to 18 ft. lbs. (25 Nm).
  9. Engage the electrical connections and the spark plug wires.


  10. jturcotte_483.jpg

May 02, 2011 | Chevrolet Astro Cars & Trucks

1 Answer

I need the location of the electronic spark control module on my 1994 gmc jimmy


the 'pick up' module is inside the distributor, under the rotor at the base of the shaft-it lifts out and is connected to a harness.

Jan 23, 2011 | 1994 GMC Jimmy

1 Answer

I would like to know how to install a disributor on a 1996 gmc jimmy


In 96' GM has a certain way of doing things since timing is not adjustable, what you will need to do is this.

Bring the engine up to Top Dead Center (TDC) of cylinder number 1. Make sure it is on the compression stroke.

  1. Remove the distributor cap screws and cap to expose the rotor.
  2. Align the pre-drilled indent hole in the distributor driven gear with the arrow cast into the upper portion of the shaft housing. The rotor segment should point to the cap hold down mount nearest the flat side of the housing.
  3. Using a long screw driver, align the oil pump drive shaft in the engine in the mating drive tab in the distributor.
  4. Guide the distributor into place, making sure the locating slot in the distributor base fits over the dowel pin in the intake manifold. -
  5. ONCE The DISTRIBUTOR IS FULLY SEATED, the rotor segment should be aligned with the pointer cast into the distributor base. This pointer will have a "6" cast into it, indicating the distributor is to be used in a 6 cylinder engine. if the rotor segment does not come within a few degrees of the pointer, the gear mesh between the distributor and camshaft may be off a tooth or more. If this is the case, repeat the procedure again to achieve proper alignment.
hope this helps out.

Aug 25, 2010 | GMC Jimmy Cars & Trucks

1 Answer

Turns over but dont start. 98 chevy blazer


First verify if you have spark using a tester,then verify you have fuel
now verify timing heres how;

To get #1 compression remove plug and put your finger in the hole and have someone crank the engine until you feel your finger being pushed off by the air pressure. Now line up the timing mark.

Rotate the number 1 cylinder to Top Dead Center (TDC) of the compression stroke.



Align white paint mark on the bottom stem of the distributor, and the pre-drilled indent hole in the bottom of the gear (3).
Notice: The ignition system distributor driven gear and rotor may be installed in multiple positions. In order to avoid mistakes, mark the distributor on the following components in order to ensure the same mounting position upon reassembly:

• The distributor driven gear

• The distributor shaft

• The rotor holes

Installing the driven gear 180 degrees out of alignment, or locating the rotor in the wrong holes, will cause a no-start condition. Premature engine wear or damage may result.

Notice: Installing the driven gear 180 degrees out of alignment, or locating the distributor rotor in the wrong holes, may cause a no-start condition. Premature engine wear and damage may result.

With the gear in this position, the rotor segment should be positioned as shown for a V6 engine (1) or V8 engine (2).
- The alignment will not be exact.

- If the driven gear is installed incorrectly, the dimple will be approximately 180 degrees opposite of the rotor segment when it is installed in the distributor.





Using a long screw driver, align the oil pump drive shaft to the drive tab of the distributor.
Guide the distributor into the engine. Ensure that the spark plug towers are perpendicular to the centerline of the engine.



Once the distributor is fully seated, the rotor segment should be aligned with the pointer cast into the distributor base.
- This pointer may have a 6 cast into it, indicating that the distributor is to be used on a 6 cylinder engine or a 8 cast into it, indicating that the distributor is to be used on a 8 cylinder engine.

- If the rotor segment does not come within a few degrees of the pointer, the gear mesh between the distributor and the camshaft may be off a tooth or more.

- If this is the case, repeat the procedure again in order to achieve proper alignment.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

Install the distributor mounting clamp.

Tighten
Tighten the distributor clamp bolt to 25 N·m (18 lb ft).





Install the distributor cap.
Install two NEW distributor cap screws.

Tighten
Tighten the screws to 2.4 N·m (21 lb in).

Install the electrical connector to the distributor.
Install the spark plug wires to the distributor cap. Refer to Spark Plug Wire Harness Replacement
Important: If the Malfunction Indicator lamp is turned on after installing the distributor, and a DTC P1345 is found, the distributor has been installed incorrectly.
Repeat Installation Procedure 2 for proper distributor installation 
hope this helps

Jul 16, 2010 | 1998 Chevrolet Blazer

4 Answers

Replacing distributor and I lost the position of the rotor and truck wont start... do I need to take #1 cyl to top? and the aline rotor?


Yes, when cyclinder one is at top, the rotor should be pointing towards the #1 spark plug wire

Nov 16, 2009 | 1999 GMC Jimmy

1 Answer

GMC 2500 P/U 350 Vortec.. Installed rebuilt engine,engine turns over, coil will spark one time and we get no more fire.


Have you checked to see if your distributor is aligned properly? I just had to change out a distributor on a 1997 GMC 3/4 ton that has the V8 Vortec in it as well and you need to pay attention to the (2) numbers around the mating surface / rim of the distributor. You should see a number 8 and a number 6. You need to find TDC on your number 1 cyl. You can either slowly crank the motor over or turn the motor over with a ratchet and socket on the bolt securing the main pully to the crank while another person places their finger over the spark plug hole and when it just starts to Stop pushing air out past your finger then stop. Is the rotor aligned with the number what ever size engine you have in your truck (i.e. 6 or 8)? If not then your timing is off. You will need to remove the distributor and rotor, then install your rotor (before re-installing the distributor) and align the rotor pointer with either the number 8 or 6 stamped on the lip of the distributor where the cap sits down and creates the seal. I have found that they run both numbers on the distributor because they use the same distributor in both the V6 and V8 Vortec motors or a least the plastic base of the distributor. There will be (2) numbers here and sometimes hard to see. Align the pointer with what size engine you have and lower the distributor down into the hole. If the end of the shaft starts to turn the rotor as it aligns with the oil pump causing the pointer to no longer be pointed at the number that indicates which engine this is being installed in then you need to remove the distributor and look down into the hole where the distributor goes in and you'll see the end of the oil pump shaft with a slot (perfect for a big flat head screwdriver) staring back up at you. You'll need to insert a long shanked large flat head screwdriver down into the hole and turn the slotted oil pump shaft until you can successfully lower the distrubutor into place and not lose your mark. I also found that you'll need to have to pointer of the rotor a bit retarted from where it is suppose to be. This is because the distributor shaft gear is swirled and will cause the rotor to turn as it finds its mark, aligns and lowers down into a seated position. When it is seated and the rotor has stopped turning it should be pointing at the indicated cylinder Stamp in the lip that is your size motor (V6 or V8). Now it should be on time. The computer will take care of advancing and retarding.

If not the timing, then I would also consider that you may have a bad crank shaft sensor. These are merley suggestions because there is no more to go on than what you've submitted.

Mar 15, 2009 | 1997 GMC Jimmy

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