Toyota Celica/Supra 1971-1985 Repair Guide

Distributor

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REMOVAL



Except 5M-GE Engines
1971-83 MODELS

See Figures 1 and 2



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Fig. Fig. 1: Exploded view of the point type distributor



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Fig. Fig. 2: Exploded view of the fully transistorized type distributor

On the 8R-C and 18R-C engines, the distributor is on the right (passenger's) side. On all other engines, the distributor is located at the front of the engine on the left (driver's) side. To remove the distributor, proceed in the following order:

  1. Unfasten the retaining clips and lift the distributor cap straight off. It will be easier to install the distributor if the wiring is left connected to the cap. If the wires must be removed from the cap, mark their positions to aid in installation.
  2.  
  3. Remove the dust cover and mark the position of the rotor relative to the distributor body; then mark the position of the body relative to the block.
  4.  
  5. Disconnect the coil primary wire and the vacuum lines, mark which is which for installation.
  6.  
  7. Remove the pinch-bolt and lift the distributor straight out, away from the engine. The rotor and body are marked so that they can be returned to the position from which they were removed. Do not turn or disturb the engine (unless absolutely necessary, such as for engine rebuilding), after the distributor has been removed.
  8.  

1984-85 MODELS

See Figures 3 through 11



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Fig. Fig. 3: Mark or tag the spark plug wires at the distributor cap before disconnecting them



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Fig. Fig. 4: Matchmark the distributor positioning at the base of the distributor and the cylinder head



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Fig. Fig. 5: Mark the distributor rotor also



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Fig. Fig. 6: If equipped, disconnect the harness as shown-it is usually green



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Fig. Fig. 7: Loosen and remove the mounting bolts



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Fig. Fig. 8: Carefully pull the unit out of the engine compartment



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Fig. Fig. 9: If removed, install the rotor in the correct position, based on the marking made previously



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Fig. Fig. 10: Place the distributor cap into position ...



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Fig. Fig. 11: ... and tighten the cap's hold-down fasteners, then connect the spark plug wires

  1. Disconnect the negative battery cable.
  2.  
  3. Label and disconnect the distributor wiring and spark plug wires.
  4.  
  5. Matchmark the distributor and rotor positions.
  6.  
  7. Remove the distributor hold-down bolts.
  8.  
  9. Remove the distributor assembly.
  10.  

5M-GE Engines
  1. Unfasten the retaining clips and lift the distributor cap straight off. It will be easier to install the distributor if the wiring is left connected to the cap. If the wires must be removed from the cap, mark their positions to aid in installation.
  2.  
  3. Remove the dust cover and mark the position of the rotor relative to the distributor body; then mark the position of the body relative to the block.
  4.  
  5. Disconnect the coil primary wire and the vacuum lines, mark which is which for installation.
  6.  
  7. Remove the pinch-bolt and lift the distributor straight out, away from the engine. The rotor and body are marked so that they can be returned to the position from which they were removed. Do not turn or disturb the engine (unless absolutely necessary, such as for engine rebuilding), after the distributor has been removed.
  8.  

INSTALLATION



1971-83 Models
TIMING NOT DISTURBED
  1. Insert the distributor in the block and align the matchmarks made during removal.
  2.  
  3. Engage the distributor driven gear with the distributor drive.
  4.  
  5. Install the distributor clamp and secure it with the pinch-bolt.
  6.  
  7. Install the cap, primary wire, and vacuum line(s).
  8.  
  9. Install the spark plug leads. Consult the marks made during removal to be sure that the proper lead goes to each plug. Install the high tension wire if it was removed.
  10.  
  11. Start the engine. Check the timing and adjust it with the octane selector (if equipped), as outlined in Engine Performance and Tune-up .
  12.  

TIMING DISTURBED-EXCEPT 5M-GE ENGINE

If the engine has been cranked, dismantled, or the timing otherwise lost, proceed as follows:

  1. Determine the Top Dead Center (TDC) of the No. 1 cylinder's compression stroke by removing the spark plug from the No. 1 cylinder and placing your finger on a vacuum gauge over the spark plug hole. This is important because the timing marks will also line up with the cylinder in the firing order in its exhaust stroke.
  2.  


CAUTION
On engines which have the spark plugs buried in the exhaust manifold, use a compression gauge or a screwdriver handle, not your finger, if the manifold is still hot.

Crank the engine until compression pressure starts to build up. Continue cranking the engine until the timing marks indicate TDC or 0 .

  1. Next, align the timing marks to the specifications given in the Ignition Timing column of the Tune-Up Specifications chart at the beginning of Engine Performance and Tune-up .
  2.  
  3. Temporarily install the rotor in the distributor without the dust cover. Turn the distributor shaft so that the rotor is pointing toward the No. 1 terminal in the distributor cap. The points should be just about to open.
  4.  
  5. Use a small flat bladed tool to align the slot on the distributor drive (oil pump driveshaft) with the key on the bottom of the distributor shaft.
  6.  
  7. Align the matchmarks on the distributor body and the block which were made during the removal. Install the distributor in the block by rotating it slightly (no more than one gear tooth in either direction) until the driven gear meshes with the drive.
  8.  

Oil the distributor spiral gear and the oil pump driveshaft end before distributor installation.

  1. Rotate the distributor, once it is installed, so that the point are just about to open or the projection on the pickup coil is almost opposite the signal rotor tooth. Temporarily tighten the pinch-bolt.
  2.  
  3. Remove the rotor and install the dust cover. Replace the rotor and the distributor cap.
  4.  
  5. Install the primary wire and the vacuum line(s).
  6.  
  7. Install the No. 1 spark plug. Connect the cables to the spark plugs in the proper order by using the marks made during removal. Install the high tension lead if it was removed.
  8.  
  9. Start the engine. Adjust the ignition timing and the octane selector (if equipped), as outlined in Engine Performance and Tune-up .
  10.  

TIMING DISTURBED-5M-GE ENGINE

See Figures 12, 13, 14, 15 and 16



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Fig. Fig. 12: Align the camshaft and camshaft housing matchmarks through the oil filler hole

If the engine has been cranked, dismantled, or the timing otherwise lost, proceed as follows:

  1. Determine the Top Dead Center (TDC) of the No. 1 cylinder's compression stroke by removing the spark plug from the No. 1 cylinder and placing your finger on a vacuum gauge over the spark plug hole. This is important because the timing marks will also line up with the cylinder in the firing order in its exhaust stroke.
  2.  


CAUTION
On engines which have the spark plugs buried in the exhaust manifold, use a compression gauge or a screwdriver handle, not your finger, if the manifold is still hot.

Crank the engine until compression pressure starts to build up. Continue cranking the engine until the timing marks indicate TDC (or 0 ).



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Fig. Fig. 13: Always install a new O-ring on the distributor shaft



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Fig. Fig. 14: Align the matchmarks on the distributor gear and housing



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Fig. Fig. 15: Rotor tooth-to-pick-up coil alignment-1982 5M-GE engine



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Fig. Fig. 16: Rotor tooth-to-pick-up coil alignment-1983-85 5M-GE engine

  1. Remove the oil filler cap. Looking into the camshaft housing with the aid of a flashlight, check to make sure that the match hole on the second (No. 2) journal of the camshaft housing is aligned with the hole in the No. 2 journal of the camshaft. If the holes are not aligned, rotate the camshaft one full turn.
  2.  
  3. Install the new O-ring on the distributor shaft. Make sure the distributor cap is still removed at this time.
  4.  
  5. Align the matchmark on the distributor spiral gear with that of the distributor housing as shown.
  6.  
  7. Insert the distributor into the camshaft housing, aligning the center of the mounting flange with that of the bolt hole in the side of the housing.
  8.  
  9. Align the rotor tooth in the distributor with the pickup coil. Temporarily install the distributor pinch bolt.
  10.  
  11. Install the distributor cap, and install the oil filler cap.
  12.  
  13. Install the No. 1 spark plug. Connect the cables to the spark plugs in the proper order by using the marks made during removal. Install the high tension lead if it was removed.
  14.  
  15. Start the engine. Adjust the ignition timing and the octane selector (if equipped), as outlined in Engine Performance and Tune-up .
  16.  

1984-85 Models
  1. Set the engine at TDC of the No. 1 cylinder's firing stroke. This can be accomplished by removing the No. 1 spark plug and turn the engine by hand with your thumb over the spark plug hole. As No. 1 is coming up on its firing stroke, you'll feel pressure against your thumb. Make sure the timing marks are set at 0.
  2.  
  3. Coat the spiral gear and governor shaft tip with clean engine oil. Align the protrusion on the distributor housing with the pin on the spiral gear drill mark side. Insert the distributor, aligning the center of the flange with the bolt hole on the cylinder head. Tighten the bolts.
  4.  
  5. On the Celica, rotate the crankshaft until the timing mark is aligned with the 5°deg; BTDC mark; make sure the rocker arms on the No. 1 cylinder are loose. Install the rotor and then begin to install the distributor with the rotor pointing upward and the distributor mounting hole at about center position on the bolt hole; when fully installed, the rotor will rotate to the position shown. Remove the rotor and align the signal rotor tooth with the pickup coil projection. Tighten the mounting bolts.
  6.  
  7. Connect the spark plug wires and then check the ignition timing.
  8.  

 
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