ENGINE UNIT (for DPF) INSPECTION


  1. INSPECT INJECTION GEAR BEARING


    1. Check that the bearing is not rough or worn.

      If necessary, replace the injection gear.

  2. INSPECT NO. 1 IDLE GEAR OIL CLEARANCE


    1. A01E1WGE01

      Using a cylinder gauge, measure the inside diameter of the idle gear.

      Standard idle gear inside diameter
      44.000 to 44.025 mm (1.7323 to 1.733 in.)
    2. A01DWX6E01

      Using a micrometer, measure the diameter of the idle gear shaft.

      Standard idle gear shaft diameter
      43.955 to 43.990 mm (1.7305 to 1.7319 in.)

    3. Subtract the idle gear shaft diameter measurement from the idle gear inside diameter measurement.

      Standard oil clearance
      0.01 to 0.07 mm (0.0004 to 0.0028 in.)
      Maximum oil clearance
      0.20 mm (0.0079 in.)

      If the oil clearance is more than the maximum, replace the gear and shaft.

  3. INSPECT INTAKE MANIFOLD


    1. A01E0ASE01

      Using a precision straightedge and feeler gauge, measure the warpage of the surface of the intake manifold that contacts the cylinder head.

      Maximum warpage
      0.4 mm (0.0157 in.)

      If the warpage is more than the maximum, replace the intake manifold.

  4. INSPECT EXHAUST MANIFOLD


    1. A01E1TXE01

      Using a precision straightedge and feeler gauge, measure the warpage of the surface of the exhaust manifold that contacts the cylinder head.

      Maximum warpage
      0.4 mm (0.0157 in.)

      If the warpage is more than the maximum, replace the exhaust manifold.

  5. INSPECT CAMSHAFT


    1. Inspect the circle runout.


      1. Place the camshaft on V-blocks.

      2. Using a dial indicator, measure the circle runout at the center journal.

        Maximum circle runout
        0.03 mm (0.0012 in.)

        If the circle runout is more than the maximum, replace the camshaft.

    2. Inspect the cam lobe height.


      1. Using a micrometer, measure the cam lobe height.

        Standard cam lobe height
        46.83 to 46.93 mm (1.8437 to 1.8476 in.)
        Minimum cam lobe height
        46.68 mm (1.8378 in.)

        If the cam lobe height is less than the minimum, replace the camshaft.

    3. Inspect the diameter of the camshaft journal.


      1. Using a micrometer, measure the diameter of the camshaft journal for the camshaft bearing.

        Standard diameter
        27.969 to 27.985 mm (1.1011 to 1.1018 in.)

        If the diameter is not as specified, check the oil clearance.

    4. A01E22ME01

      Using a dial indicator, measure the backlash.


      1. Install the 2 camshafts.

      2. Using a dial indicator, measure the backlash.

        Standard backlash
        0.035 to 0.089 mm (0.0014 to 0.0035 in.)
        Maximum backlash
        0.189 mm (0.0074 in.)

        If the backlash is more than the maximum, replace the 2 camshafts.

      3. Remove the 2 camshafts.

  6. INSPECT NO. 2 CAMSHAFT


    1. Inspect the circle runout.


      1. Place the camshaft on V-blocks.

      2. Using a dial indicator, measure the circle runout at the center journal.

        Maximum circle runout
        0.03 mm (0.0012 in.)

        If the circle runout is more than the maximum, replace the camshaft.

    2. Inspect the cam lobe height.


      1. Using a micrometer, measure the cam lobe height.

        Standard cam lobe height
        46.87 to 46.97 mm (1.8453 to 1.8492 in.)
        Minimum cam lobe height
        46.72 mm (1.8394 in.)

        If the cam lobe height is less than the minimum, replace the camshaft.

    3. Inspect the diameter of the camshaft journal.


      1. Using a micrometer, measure the diameter of the camshaft journal for the camshaft bearing.

        Standard diameter
        27.969 to 27.985 mm (1.1011 to 1.1018 in.)

        If the diameter is not as specified, check the oil clearance.

  7. INSPECT CAMSHAFT OIL CLEARANCE


    1. Clean the bearing caps and journals.

    2. Check the bearings for flaking and scoring.

      If the bearings are damaged, replace the bearing caps and cylinder head as a set.

    3. Place the camshaft on the cylinder head.

    4. A01DWD7E02
      Text in Illustration
      *1 Plastigage
      *a Intake Side
      *b Exhaust Side

      Lay a strip of Plastigage across each of the journals.

    5. Install the bearing caps.

      Note

      Do not turn the camshaft.

    6. Remove the bearing caps.

    7. A01E2OIE02
      Text in Illustration
      *1 Plastigage
      *a Intake Side
      *b Exhaust Side

      Measure the Plastigage at its widest point.

      Standard oil clearance
      0.025 to 0.062 mm (0.0010 to 0.0024 in.)
      Maximum oil clearance
      0.1 mm (0.0039 in.)

      If the oil clearance is more than the maximum, replace the camshaft. If necessary, replace the bearing caps and cylinder head as a set.

    8. Completely remove the Plastigage.

    9. Remove the camshaft.

  8. INSPECT CAMSHAFT THRUST CLEARANCE


    1. Install the camshaft.

    2. A01E0LBE02
      Text in Illustration
      *a Intake Side
      *b Exhaust Side

      Using a dial indicator, measure the thrust clearance while moving the camshaft back and forth.

      Standard thrust clearance
      0.035 to 0.185 mm (0.0014 to 0.073 in.)
      Maximum thrust clearance
      0.25 mm (0.0098 in.)

      If the thrust clearance is more than the maximum, replace the camshaft. If necessary, replace the bearing caps and cylinder head as a set.

    3. Remove the camshaft.

  9. INSPECT CYLINDER HEAD SET BOLT


    1. A01E05IE01
      Text in Illustration
      *1 Measuring Area

      Using a vernier caliper, measure the diameter of the most elongated threads in the measurement area.

      Standard outside diameter
      11.8 to 12.0 mm (0.465 to 0.472 in.)
      Minimum outside diameter
      11.6 mm (0.457 in.)

      Tech Tips

      If a visual check reveals no excessively thin areas, check the center of the bolt (see illustration) and find the area that has the smallest diameter.

      If the diameter is less than the minimum, replace the cylinder head set bolt.

  10. INSPECT CYLINDER BLOCK OIL ORIFICE


    1. Check the oil orifice for damage or clogging.

      If necessary, replace the cylinder block oil orifice.

  11. INSPECT OIL CHECK VALVE SUB-ASSEMBLY


    1. A01DYS7E05
      Text in Illustration
      *1 Ball
      A01E2TX Push

      Push the ball of the oil check valve with a wooden stick to check if it is stuck.

      If the ball of the oil check valve is stuck, replace the oil check valve sub-assembly.

  12. INSPECT NO. 1 OIL NOZZLE SUB-ASSEMBLY


    1. Check the No. 1 oil nozzle for damage or clogging.

      If necessary, replace the No. 1 oil nozzle sub-assembly.

  13. CLEAN CYLINDER BLOCK SUB-ASSEMBLY


    1. Using a gasket scraper, remove all the gasket material from the top surface of the cylinder block.

    2. Using a soft brush and solvent, thoroughly clean the cylinder block sub-assembly.

  14. INSPECT CYLINDER BLOCK FOR WARPAGE


    1. A01DZSWE01

      Inspect for warpage.


      1. Using a precision straightedge and feeler gauge, measure the surface of the cylinder block that contacts the cylinder head for warpage.

        Maximum warpage
        0.1 mm (0.0039 in.)

        If the warpage is more than the maximum, replace the cylinder block sub-assembly.

    2. Visually check the cylinders for vertical scratches.

      If deep scratches are present, rebore all 4 cylinders. If necessary, replace the cylinder block.

  15. INSPECT CYLINDER BORE


    1. A01DYJGE08
      Text in Illustration
      *1 Mark 1, 2 or 3
      *2 No. 1
      *3 No. 2
      *4 No. 3
      *5 No. 4

      Inspect the cylinder bore diameter.

      Tech Tips

      There are 3 standard cylinder bore diameter sizes, marked 1, 2 and 3 accordingly. The mark is stamped on the cylinder block.


      1. A01E2TLE04
        Text in Illustration
        *1 Axial Direction
        *2 Thrust Direction
        *3 Center
        A01E2TX Front
        A01E0ILE06
        Text in Illustration
        *1 Ridge Reamer

        Using a cylinder gauge, measure the cylinder bore diameter at positions A, B and C in the thrust and axial directions.

        Standard Diameter
        Item Specified Condition
        STD Mark 1 92.00 to 92.01 mm (3.6220 to 3.6224 in.)
        STD Mark 2 92.01 to 92.02 mm (3.6224 to 3.6228 in.)
        STD Mark 3 92.02 to 92.03 mm (3.6228 to 3.6232 in.)
        O/S 0.50 92.50 to 92.53 mm (3.6417 to 3.6429 in.)
        Maximum Diameter
        Item Specified Condition
        STD 92.23 mm (3.6311 in.)
        O/S 0.50 92.73 mm (3.6508 in.)

        If the diameter is more than the maximum, rebore all 4 cylinders. If necessary, replace the cylinder block sub-assembly.

        If the wear is less than 0.2 mm (0.0078 in.), using a ridge reamer, grind the top of the cylinder.

  16. CLEAN PISTON


    1. Using a groove cleaning tool or broken ring, clean the piston ring grooves.

    2. Using solvent and a brush, thoroughly clean the piston.

      Note

      Do not use a wire brush.

  17. INSPECT PISTON WITH PIN SUB-ASSEMBLY

    Tech Tips

    When replacing the piston sub-assembly (w/ pin) with a supply part, there are a number of piston diameter sizes to choose from, but there is only one size of piston pin diameter.


    1. A01DWF0E01
      Text in Illustration
      *1 Size Mark
      *2 Piston Pin Hole Inside Diameter Mark
      *3 Front Mark (Arrow)
      *4 Distance

      Using a micrometer, measure the piston diameter according to the following conditions: 1) measure at a right angle to the piston center line, and 2) measure at the indicated distance from the piston head.

      Distance
      63.5 mm (2.50 in.)
      Standard Piston Diameter
      Item Specified Condition
      STD Mark 1 91.92 to 91.93 mm (3.6189 to 3.6193 in.)
      STD Mark 2 91.93 to 91.94 mm (3.6193 to 3.6197 in.)
      STD Mark 3 91.94 to 91.95 mm (3.6197 to 3.6201 in.)
      O/S 0.50 92.42 to 92.45 mm (3.6386 to 3.6398 in.)
      Standard Pin Hole Inside Diameter
      Item Specified Condition
      Mark A 34.007 to 34.011 mm (1.3389 to 1.3390 in.)
      Mark B 34.011 to 34.015 mm (1.3390 to 1.3392 in.)
      Mark C 34.015 to 34.019 mm (1.3392 to 1.3393 in.)
    2. A01E2G0E01

      Using a micrometer, measure the piston pin diameter.

      Standard Piston Pin Diameter
      Item Specified Condition
      Mark A 33.996 to 34.000 mm (1.3384 to 1.3386 in.)
      Mark B 34.000 to 34.004 mm (1.3386 to 1.3387 in.)
      Mark C 34.004 to 34.008 mm (1.3387 to 1.3389 in.)

    3. Subtract the piston pin diameter measurement from the piston pin hole inside diameter measurement.

      Standard oil clearance
      0.003 to 0.011 mm (0.00012 to 0.00043 in.)

      If the oil clearance is more than the maximum, replace the piston with pin sub-assembly.

    4. A01E0ZU

      Inspect the piston pin fit.


      1. At 80°C (176°F), check that the piston pin can be pushed into the piston pin hole with your thumb.

        If the pin can be installed at a lower temperature, replace the piston with pin sub-assembly.

  18. INSPECT PISTON OIL CLEARANCE


    1. A01E2DCE01
      Text in Illustration
      *1 No. 1
      *2 No. 2
      *3 No. 3
      *4 No. 4
      *5 Mark 1, 2 or 3
      *6 Size Mark

      Measure the cylinder bore diameter in the thrust direction.

    2. Subtract the piston diameter measurement from the cylinder bore diameter measurement.

      Standard oil clearance
      0.07 to 0.09 mm (0.0028 to 0.0035 in.)
      Maximum oil clearance
      0.16 mm (0.0063 in.)

      If the oil clearance is more than the maximum, replace all 4 pistons and rebore all 4 cylinders.

      If necessary, replace the cylinder block sub-assembly.

      Tech Tips

      When the cylinder block is replaced, use a piston with the same number mark as the cylinder diameter marked on the new cylinder block.

  19. INSPECT RING GROOVE CLEARANCE


    1. Using a feeler gauge, measure the clearance between a new piston ring and the wall of the ring groove.

      Standard Groove Clearance
      Item Specified Condition
      No. 1 piston ring 0.060 to 0.100 mm (0.0024 to 0.0039 in.)
      No. 2 piston ring 0.050 to 0.095 mm (0.0020 to 0.0037 in.)
      Oil ring 0.030 to 0.075 mm (0.0012 to 0.0027 in.)

      If the result is not as specified, replace the piston with pin sub-assembly.

  20. INSPECT PISTON RING END GAP


    1. Insert the piston ring into the cylinder bore.

    2. Using a piston, push the piston ring a little beyond the bottom of the ring travel, 120 mm (4.72 in.) from the top of the cylinder block.

    3. Using a feeler gauge, measure the end gap.

      Standard End Gap
      Item Specified Condition
      No. 1 piston ring 0.24 to 0.34 mm (0.00945 to 0.0139 in.)
      No. 2 piston ring 0.47 to 0.62 mm (0.0185 to 0.0244 in.)
      Oil ring 0.20 to 0.40 mm (0.00787 to 0.0157 in.)
      Maximum End Gap
      Item Specified Condition
      No. 1 piston ring 1.21 mm (0.0476 in.)
      No. 2 piston ring 1.44 mm (0.0567 in.)
      Oil ring 1.22 mm (0.0480 in.)

      If the end gap is more than the maximum, replace the piston ring.

      If the end gap is more than the maximum even with a new piston ring, rebore all 4 cylinders or replace the cylinder block sub-assembly.

  21. INSPECT PISTON PIN OIL CLEARANCE


    1. A01DVQWE02
      Text in Illustration
      *1 Connecting Rod Bush Inside Diameter Mark A, B or C
      *2 Front Mark

      Using a caliper gauge, measure the inside diameter of the connecting rod bush.

      Standard Bush Inside Diameter
      Item Specified Condition
      Mark A 34.012 to 34.016 mm (1.3390 to 1.3392 in.)
      Mark B 34.016 to 34.020 mm (1.3392 to 1.3394 in.)
      Mark C 34.020 to 34.024 mm (1.3394 to 1.3395 in.)

    2. Subtract the piston pin diameter measurement from the bush inside diameter measurement.

      Standard oil clearance
      0.012 to 0.020 mm (0.00047 to 0.00088 in.)
      Maximum oil clearance
      0.03 mm (0.01 in.)

      If the oil clearance is more than the maximum, replace the connecting rod sub-assembly.

      If necessary, replace the piston with pin sub-assembly.

  22. INSPECT CONNECTING ROD SUB-ASSEMBLY


    1. Using a rod aligner and feeler gauge, check the connecting rod alignment.


      1. A01DZ2ME01

        Check if the connecting rod is bent.

        Maximum bend
        0.03 mm (0.0012 in.) per 100 mm (3.94 in.)

        If the bend is more than the maximum, replace the connecting rod sub-assembly.

      2. A01DWJVE01

        Check if the connecting rod is twisted.

        Maximum twist
        0.15 mm (0.0059 in.) per 100 mm (3.94 in.)

        If the twist is more than the maximum, replace the connecting rod sub-assembly.

  23. INSPECT CONNECTING ROD BOLT


    1. A01DZE4E01
      Text in Illustration
      *1 Tension Portion

      Using a vernier caliper, measure the diameter of the tension portion of the bolt.

      Standard diameter
      8.5 to 8.6 mm (0.3346 to 0.3385 in.)
      Minimum diameter
      8.3 mm (0.3268 in.)

      If the diameter is less than the minimum, replace the connecting rod bolt.

  24. INSPECT CRANKSHAFT


    1. Inspect for circle runout.


      1. Place the crankshaft on V-blocks.

      2. Using a dial indicator, measure the circle runout at the center journal.

        Maximum circle runout
        0.03 mm (0.0012 in.)

        If the circle runout is more than the maximum, replace the crankshaft.

    2. A01DW7IE02

      Inspect the main journals and crank pins.


      1. Using a micrometer, measure the diameter of each main journal and crank pin.

        Standard Main Journal Diameter
        Item Specified Condition
        Mark 1 69.994 to 70.000 mm (2.7557 to 2.7559 in.)
        Mark 2 69.988 to 69.994 mm (2.7554 to 2.7557 in.)
        Mark 3 69.982 to 69.988 mm (2.7552 to 2.7554 in.)
        U/S 0.25 69.745 to 69.755 mm (2.7459 to 2.7463 in.)
        U/S 0.50 69.495 to 69.505 mm (2.7360 to 2.7364 in.)
        Standard Crank Pin Diameter
        Item Specified Condition
        Mark 1 58.994 to 59.000 mm (2.3226 to 2.3228 in.)
        Mark 2 58.988 to 58.994 mm (2.3224 to 2.3226 in.)
        Mark 3 58.982 to 58.988 mm (2.3221 to 2.3224 in.)
        U/S 0.25 58.745 to 58.755 mm (2.3128 to 2.3132 in.)
        U/S 0.50 58.495 to 58.505 mm (2.3029 to 2.3033 in.)

        If the diameter is not as specified, check the connecting rod oil clearance Click here and crankshaft oil clearance Click here. If necessary, grind or replace the crankshaft.

      2. Check each main journal and crank pin for taper and out-of-round as shown in the illustration.

        Maximum taper and out-of-round
        0.02 mm (0.0008 in.)

        If the taper and out-of-round is more than the maximum, replace the crankshaft.

    3. If necessary, grind and hone the main journals and/or crank pins.


      1. Grind and hone the main journals and/or crank pins to the finished undersized diameter (refer to the procedures above).

      2. Install new main journal and/or crank pin undersized bearings.

  25. INSPECT CRANKSHAFT BEARING CAP SET BOLT


    1. A01E2IUE01
      Text in Illustration
      *1 Measuring Area

      Using a vernier caliper, measure the diameter of the crankshaft bearing cap set bolt in the measuring area.

      Standard diameter
      13.5 to 14.0 mm (0.5315 to 0.5512 in.)
      Minimum diameter
      12.6 mm (0.4961 in.)

      If the diameter is less than the minimum, replace the crankshaft bearing cap set bolt.