Toyota Cressida and Van 1983-1990

Valve Lash

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All the Toyota models being covered in this guide, except for the 1989-90 Cressida are equipped with hydraulic lash adjusters in the valve train. These adjusters maintain a zero lash clearance between the rocker arm and the valve stem, no adjustment is possible or necessary.

ADJUSTMENT
Cressida
7M-GE ENGINE


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Fig. Fig. 1 Adjusting the No. 2 (IN), No. 6 (IN), No. 2 (EX) and No. 6 (EX) valves



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Fig. Fig. 2 Adjusting the No. 1 (IN), No. 4 (IN), No. 1 (EX) and No. 5 (EX) valves



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Fig. Fig. 3 Adjusting the No. 3 (IN), No. 5 (IN), No. 3 (EX) and No. 6 (EX) valves



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Fig. Fig. 4 A special tool is used to remove the adjusting shims



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Fig. Fig. 5 A small pry tool and magnet can be used to remove the adjusting shim



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Fig. Fig. 6 Using a micrometer, measure the adjusting shim to determine its thickness

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the cylinder head covers as follows:
  4.  
    1. Remove the air cleaner hose along with air connector pipe.
    2.  
    3. Remove the PCV orifice pipe and hoses.
    4.  
    5. Disconnect and remove the accelerator link.
    6.  
    7. Remove the air intake connector, vacuum transmitting pipe and brackets.
    8.  
    9. Disconnect and tag the spark plug cables.
    10.  
    11. Remove the cylinder head cover retaining bolts and remove the cylinder head covers.
    12.  

  5. Use a wrench and turn the crankshaft until the notch in the pulley aligns with the timing mark 0 of the No. 1 timing belt cover. This will insure that engine is at TDC.
  6.  

Check that the valve lifters on the No. 1 cylinder are loose and those on No. 6 cylinder are tight. If not, turn the crankshaft 1 complete revolution (360°) and then realign the marks.

  1. Using a flat feeler gauge check the clearance between the camshaft lobe and the valve lifter on the No.1 (IN) and NO.4 (IN) and No.1 (EX) and NO.4 (EX) valves. This measurement should correspond to specification.

    Intake: 0.15-0.25mm (0.006-0.010 in.)
     
    Exhaust: 0.20-0.30mm (0.008-0.012 in.)
     

  2.  

If the measurement is within specifications, go on to the next step. If not, record the measurement taken for each individual valve.

  1. Turn the crankshaft 2 / 3 revolution (240°).
  2.  
  3. Measure the clearance of the No.3 (IN) and NO.5 (IN) and No.3 (EX) and NO.6 (EX) valves. This measurement should correspond to specification.
  4.  

Hint; check that the valve lifters on the number 3 cylinder are loose. If the measurement is within specifications, go on to the next step. If not, record the measurement taken for each individual valve.

  1. Turn the crankshaft 2 / 3 revolution (240°).
  2.  
  3. Measure the clearance of the No.2 (IN) and NO.6 (IN) and No.2 (EX) and NO.4 (EX) valves. This measurement should correspond to specification.
  4.  

If the measurement for this set of valves (and also the previous ones) is within specifications, go no further, the procedure is finished. If not, record the measurements and then proceed to Step 8.

  1. Turn the crankshaft to position the intake camshaft lobe of the cylinder to be adjusted, upward.
  2.  

Both intake and exhaust valve clearance may be adjusted at the same time if so required.

  1. Using a suitable tool, turn the valve lifter so that the notch is easily accessible.
  2.  
  3. Install SST No. 09248-55010 or its equivalent between the 2 camshafts lobes and then turn the handle so that the tool presses down both (intake and exhaust) valve lifters evenly. For easy removal of the shim, when positioning the tool in between the 2 camshaft lobes, set it on the lifter so there is space enough to be able to remove the shim.
  4.  
  5. Using a suitable tool and a magnet, remove the valve shims.
  6.  
  7. Measure the thickness of the old shim with a micrometer. Using this measurement and the clearance of the ones made earlier (from Step 4, 6 or 8), determine what size replacement shim will be required in order to bring the valve clearance into specification. A good guide to use when determining shim thickness is as follows:
  8.  
    1. T-Thickness of the old shim.
    2.  
    3. A-Measured valve clearance.
    4.  
    5. N-Thickness of the new shim.
    6.  
    7. Intake: N=T+(A-0.20mm) example.
    8.  
    9. Exhaust: N=T+(A-0.25mm) example.
    10.  


Replacement shims are available in 17 sizes, in increments of 0.05mm, from 2.00mm to 3.300mm.

  1. Install the new valve adjusting shim onto the valve lifter. Using the special shim installer tool (SST-09248-55010) press down the valve lifter and remove the tool and then recheck the valve clearance.
  2.  
  3. Install the cylinder head covers (using new gaskets) and install the retaining bolts. Tighten the bolts to 22 inch lbs.
  4.  
  5. Install the spark plug cables.
  6.  
  7. Install the air intake connector, vacuum transmitting pipe and brackets.
  8.  
  9. Install the accelerator link.
  10.  
  11. Install the PCV orifice pipe and hoses.
  12.  
  13. Install the air cleaner hose along with air connector pipe.
  14.  

 
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