Remove Main Bearing Caps And Check Oil Clearance

(a) Remove the main bearing cap bolts.

Schematics Air Cleaner System Mr2 Sw20

(b) Using the removed main bearing cap bolts, pry the main bearing cap back and forth, and remove the main bearing caps, lower bearings and lower thrust washers (No.3 main bearing cap only).

HINT:

• Keep the lower bearing and main bearing cap together.

• Arrange the main bearing caps and lower thrust washers in correct order.

(c) Lift out the crankshaft.

HINT: Keep the upper bearing and upper thrust washers together with the cylinder block.

(d) Clean each main journal and bearing.

(e) Check each main journal and bearing for pitting and scratches.

If the journal or bearing is damaged, replace the bearings. If necessary, grind or replace the crankshaft.

(f) Place the crankshaft on the cylinder block.

(g) Lay a strip of Plastigage across each journal.

(h) Install the main bearing caps. (See step 4 on page EM-212)

NOTICE: Do not turn the crankshaft.

No. 1 No. 2 No. 3 No. 4 No. 5

Mark

Mark

em7771 em7772 em7669

(i) Remove the main bearing caps.

(j) Measure the Plastigage at its widest point. Standard clearance:

No.3

Others STD

0.025 - 0.044 mm (0.0010-0.0017 in.) U/S 0.25 0.027 - 0.067 mm

(0.0011 - 0.0026 in.) 0.015 - 0.034 mm (0.0006-0.0013 in.) U/S 0.25 0.019 - 0.059 mm

Maximum clearance: 0.08 mm (0.0031 in.)

HINT: If replacing the cylinder block subassembly, the bearing standard clearance will be:

If the oil clearance is greater than maximum, replace the bearings. If necessary, grind or replace the crankshaft.

HINT: If using a standard bearing, replace it with one having the same number. If the number of the bearing cannot be determined, select the correct bearing by adding together the numbers imprinted on the cylinder block and crankshaft, then select the bearing with the same number as the total. There are five sizes of standard bearings, marked "1," "2," "3," "4" and "5" accordingly.

Number marked

Cylinder block

1

2

3

Crankshaft

0

1

2

0

1

2

0

1

2

Bearing

1

2

3

1

2

3

1

2

3

EXAMPLE: Cylinder block "2" + Crankshaft "1" = Bearing "3"

(Reference)

Cylinder block main journal bore diameter:

Mark "1 " 59.020 - 59.026 mm (2.3236 - 2.3239 in.)

Mark "2" 59.026 - 59.032 mm (2.3239 - 2.3241 in.)

Mark "3" 59.032 - 59.038 mm (2.3241 - 2.3243 in.)

Crankshaft journal diameter:

Mark "0" 54.998 - 55.003 mm (2.1653-2.1655 in.)

Mark "1 " 54.993 - 54.998 mm (2.1651 -2.1653 in.)

Mark "2" 54.988 - 54.993 mm (2.1649-2.1651 in.)

Standard sized bearing center wall thickness: No.3 Mark "1 " 1.992 - 1.995 mm

(0.0789 - 0.0790 in.) Others Mark "1 " 1.997 - 2.000 mm

(k) Completely remove the Plastigage.

7. REMOVE CRANKSHAFT

(a) Lift out the crankshaft.

(b) Remove the upper bearings and upper thrust washers from the cylinder block.

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