Acura Coupes and Sedans 1986-1993 Repair Guide

ADJUSTMENT

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The Integra and Vigor have screw type valve adjusters, and 1986-90 Legend models have adjustable exhaust valves only. All other engines use hydraulic valve lash adjusters.

Integra

See Figures 1 through 6

While all valve adjustments must be as accurate as possible, it is better to have the valve adjustment slightly loose than tight, as burned valves may result from overly tight adjustments.



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Fig. Fig. 1: Valve arrangement-1986-90 Integra



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Fig. Fig. 2: Camshaft pulleys aligned at TDC of No. 1 piston-1986-90 Integra



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Fig. Fig. 3: Adjusting the valves, using a feeler gauge to check adjustment-1986-90 Integra



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Fig. Fig. 4: Valve arrangement-1991-93 Integra

  1. Make sure the engine is cold; cylinder head temperature below 100°F.
  2.  



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Fig. Fig. 5: Camshaft pulleys aligned at TDC of No. 1 piston-1991-93 Integra



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Fig. Fig. 6: Adjusting the valves, using a feeler gauge to check adjustment-1991-93 Integra

  1. Remove the valve cover and the upper timing belt cover.
  2.  
  3. Set the No. 1 cylinder to Top Dead Center (TDC). The word UP should appear at the top and the TDC grooves on the pulley should align with the cylinder head surface.
  4.  
  5. With the No. 1 cylinder at TDC, adjust the valves of the No. 1 cylinder by performing the following procedures:
    1. On the 1986-1989 models, clearance should be 0.0051-0.0067 in. (0.13-0.17mm) on the intake valves and 0.0059-0.0075 in. (0.15-0.19mm) on the exhaust valves.
    2.  
    3. On the 1990-93 models, clearance should be 0.006-0.007 in. (0.15-0.19mm) on the intake valves and 0.007-0.008 in. (0.17-0.21mm) on the exhaust valves.
    4.  
    5. Hold the rocker arm against the valve and place the feeler gauge between the rocker arm and the camshaft lobe. There should be a slight drag on the feeler gauge.
    6.  
    7. If adjustment is required, loosen the valve adjusting the screw locknut.
    8.  
    9. Turn the adjusting screw to obtain the proper clearance.
    10.  
    11. Hold the adjusting screw and torque the locknut(s) to 18 ft. lbs.
    12.  
    13. Recheck the clearance.
    14.  

  6.  
  7. Turn the crankshaft 180 degrees counterclockwise, the cam pulley will turn 90 degrees. With the No. 3 cylinder at TDC, the UP marks should be at the exhaust side, adjust the valves on the No. 3 cylinder.
  8.  
  9. Turn the crankshaft 180 degrees counterclockwise, the cam pulley will turn 90 degrees. With the No. 4 cylinder at TDC, both UP marks should be at the bottom. Adjust the valves on the No. 4 cylinder.
  10.  
  11. Turn the crankshaft 180 degrees counterclockwise. The No. 2 cylinder will now be on TDC and the UP marks should be at the intake side. Adjust the valves on the No. 2 cylinder.
  12.  

1986-90 LEGEND



See Figure 7

This procedure is used to adjust the exhaust valves; the intake valves require no adjustment.



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Fig. Fig. 7: Exhaust valve assembly-1986-90 Legend

  1. Make sure the engine is cold, cylinder head temperature below 100°F.
  2.  
  3. Remove the valve and side head covers.
  4.  
  5. Rotate the crankshaft to position the No. 1 piston on the TDC of it's compression stroke; the camshaft sprockets should be in the upward position, aligned with the timing mark and the crankshaft pulley V-notch should be aligned with the timing pointer on the timing cover.
  6.  
  7. To adjust the exhaust valves, perform the following procedures:
    1. Loosen the exhaust valve locknuts on all of the cylinders.
    2.  
    3. Tighten the adjusting screw of the No. 1 cylinder, until it contacts the valve, then an additional 1 1 / 2 turns. Tighten the locknut firmly.
    4.  
    5. Perform the same procedure for the exhaust valves No. 2 and 4.
    6.  
    7. Rotate the crankshaft 180 degrees and align the crankshaft pulley's V-notch with the timing pointer on the timing cover; the No. 5 piston is at TDC of it's compression stroke.
    8.  
    9. Tighten the adjusting screw of the No. 5 cylinder, until it contacts the valve, then an additional 1 1 / 2 turns. Tighten the locknut firmly.
    10.  
    11. Perform the same procedure for the exhaust valves No. 3 and 6.
    12.  

  8.  
  9. After adjustment, use new gaskets and install the valve and side head covers.
  10.  

Vigor

See Figures 8, 9, and 10



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Fig. Fig. 8: Valve arrangement-Vigor



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Fig. Fig. 9: Camshaft pulleys aligned at TDC of No. 1 piston-Vigor



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Fig. Fig. 10: Adjusting the valves, using a feeler gauge to check adjustment-Vigor

  1. Remove the cylinder head cover and the upper timing belt cover.
  2.  
  3. Rotate the crankshaft to align the white TDC on the crankshaft pulley with the pointer on the cover. Make sure the UP mark on the camshaft sprocket is up and the TDC marks align with the edge of the cylinder head.
  4.  
  5. On the rear face of the camshaft sprocket, look for the No. 1 mark and see that it is aligned with the notch in the camshaft holder.
  6.  
  7. Hold a rocker arm of No. 1 cylinder against the camshaft and use a feeler gauge to check the clearance at the valve stem. Intake valve clearance should be 0.010 in. (026mm), exhaust valve clearance should be 0.012 in. (0.30mm). Loosen the locknut to adjust as required.
  8.  
  9. Each cylinder is marked on the rear face of the camshaft sprocket. Rotate the crankshaft to align the next mark in the notch and adjust the valves. The order will be 1-2-4-5-3.
  10.  
  11. Install the cylinder head and timing belt covers.
  12.  

 
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