Toyota Yaris: Cylinder Block / Inspection

INSPECTION

PROCEDURE

1. INSPECT CYLINDER BLOCK FOR WARPAGE

(a) Using a precision straightedge and feeler gauge, check the surface which contacts the cylinder head gasket for warpage. Maximum Warpage: 0.05 mm (0.00197 in.) HINT: If the warpage is more than the maximum, replace the cylinder block sub-assembly.

2. INSPECT CYLINDER BORE

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

*a	Thrust Direction
*b	Axial Direction
*c	10 mm (0.394 in.)
*d	Center
	Front of Engine

Reference Diameter (New Parts):

87.500 to 87.513 mm (3.4449 to 3.4454 in.)

Maximum Diameter:

87.514 mm (3.4454 in.)

HINT:

If the average diameter of 4 positions is more than the maximum, replace the cylinder block sub-assembly.

3. INSPECT PISTON

(a) Using a gasket scraper, remove any carbon from the piston top.

(b) Using a groove cleaning tool or a broken ring, clean the piston ring grooves.

(c) Using a brush and solvent, thoroughly clean the piston. NOTICE: Do not use a wire brush.

(d) Using a micrometer, measure the piston diameter at a right angle to the piston center line where the distance from the bottom of the piston is as specified. Distance: 10.5 mm (0.413 in.) Standard Piston Diameter (New Parts): 87.459 to 87.471 mm (3.443 to 3.444 in.) HINT: If the diameter is less than the minimum, replace the piston and piston pin as a set.

*a Distance

4. INSPECT PISTON OIL CLEARANCE

(a) Subtract the piston diameter measurement from the cylinder bore diameter measurement.

Reference Oil Clearance (New Parts):

0.029 to 0.054 mm (0.00114 to 0.00213 in.)

Maximum Oil Clearance:

0.065 mm (0.00256 in.)

HINT:

If the piston oil clearance is more than the maximum, replace all the pistons with piston pins. If necessary, replace the cylinder block sub-assembly.

5. INSPECT RING GROOVE CLEARANCE

(a) Using a feeler gauge, measure the clearance between a new piston ring set and the wall of the ring groove. Standard Ring Groove Clearance: Item Specified Condition No. 1 compression ring 0.045 to 0.075 mm (0.00177 to 0.00295 in.) No. 2 compression ring 0.020 to 0.070 mm (0.000787 to 0.002756 in.) Oil ring 0.07 to 0.12 mm (0.00276 to 0.00472 in.) HINT: If the groove clearance is not as specified, replace the piston and piston pin as a set.

6. INSPECT PISTON RING END GAP

(a) Insert the piston ring into the cylinder bore.

*a Piston Ring *b 70 mm

(b) Using a piston, push in the piston ring a little beyond the bottom of the ring travel, 70 mm (2.76 in.) from the top of the cylinder block sub-assembly.

(c) Using a feeler gauge, measure the end gap. Standard End Gap: Item Specified Condition No. 1 compression ring 0.160 to 0.185 mm (0.00630 to 0.00728 in.) No. 2 compression ring 0.76 to 0.81 mm (0.0299 to 0.0319 in.) Oil ring 0.100 to 0.350 mm (0.00394 to 0.01378 in.) Maximum End Gap: Item Specified Condition No. 1 compression ring 0.185 mm (0.00728 in.) No. 2 compression ring 0.81 mm (0.0319 in.) Oil ring 0.35 mm (0.0138 in.) HINT: If the end gap is more than the maximum, replace the piston ring set. If the end gap is more than the maximum even with a new piston ring set, replace the cylinder block sub-assembly.

7. INSPECT PISTON PIN OIL CLEARANCE

HINT:

When replacing the piston and piston pin with supply parts, there are a number of piston diameter sizes to choose from, but there is only one size of piston pin diameter.

(a) Confirm each mark on the piston, piston pin and connecting rod.

(b) Using a caliper gauge, measure the inside diameter of the piston pin hole. Standard Piston Pin Hole Inside Diameter: 19.009 to 19.018 mm (0.748 to 0.749 in.) Mark Specified Condition A 24.001 to 24.004 mm (0.9449 to 0.9450 in.) B 24.004 to 24.007 mm (0.9450 to 0.9452 in.) C 24.007 to 24.010 mm (0.9452 to 0.9453 in.) HINT: If the diameter is not as specified, replace the piston and piston pin as a set.

(c) Using a micrometer, measure the piston pin diameter. Standard Piston Pin Diameter: 19.004 to 19.013 mm (0.74819 to 0.74854 in.) Mark Specified Condition A 23.997 to 24.000 mm (0.9448 to 0.9449 in.) B 24.000 to 24.003 mm (0.9449 to 0.9450 in.) C 24.003 to 24.006 mm (0.9450 to 0.9451 in.) HINT: If the diameter is not as specified, replace the piston and piston pin as a set. Measurement Position: Measurement Position Piston Pin Position a 5.0 mm (0.197 in.) from side edge b 23.0 mm (0.906 in.) from side edge

(d) Using a caliper gauge, measure the inside diameter of the connecting rod small end bush. Standard Connecting Rod Small End Bush Inside Diameter: 19.012 to 19.021 mm (0.74850 to 0.74886 in.) Mark Specified Condition A 24.005 to 24.008 mm (0.9451 to 0.9452 in.) B 24.008 to 24.011 mm (0.9452 to 0.9453 in.) C 24.011 to 24.014 mm (0.9453 to 0.9454 in.) HINT: If the inside diameter is not as specified, replace the connecting rod sub-assembly.

(e) Subtract the piston pin diameter measurement from the piston pin hole inside diameter measurement.

Standard Oil Clearance:

0.001 to 0.004 mm (0.0000394 to 0.0001575 in.)

Maximum Oil Clearance:

0.017 mm (0.000669 in.)

HINT:

If the oil clearance is more than the maximum, replace the piston and piston pin as a set.

(f) Subtract the piston pin diameter measurement from the connecting rod small end bush inside diameter measurement.

Standard Oil Clearance:

0.005 to 0.011 mm (0.000197 to 0.000433 in.)

Maximum Oil Clearance:

0.021 mm (0.000827 in.)

HINT:

If the oil clearance is more than the maximum, replace the connecting rod sub-assembly. If necessary, replace the connecting rod sub-assembly and piston pin as a set.

8. INSPECT CRANKSHAFT

(a) Inspect for runout.

(1) Clean the crank journal.

(2) Place the crankshaft on V-blocks.

(3) Using a dial indicator and V-blocks, measure the runout as shown in the illustration. Maximum Runout: 0.03 mm (0.00118 in.) HINT: If the runout is more than the maximum, replace the crankshaft.

(b) Inspect the main journals.

(1) Using a micrometer, measure the diameter of each main journal.

Standard Main Journal Diameter:

55.988 to 56.000 mm (2.204 to 2.205 in.)

HINT:

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

(2) Check each main journal for taper and out-of-round as shown in the illustration. Maximum Taper and Out-of-round: 0.003 mm (0.000118 in.) HINT: If the taper or out-of-round is more than the maximum, replace the crankshaft.

(c) Inspect the crank pins.

(1) Using a micrometer, measure the diameter of each crank pin.

Standard Crank Pin Diameter:

47.992 to 48.000 mm (1.88945 to 1.88976 in.)

HINT:

If the diameter is not as specified, check the connecting rod oil clearance. If necessary, replace the crankshaft.

(2) Inspect each crank pin for taper and out-of-round as shown in the illustration. Maximum Taper and Out-of-round: 0.003 mm (0.000118 in.) HINT: If the taper or out-of-round is more than the maximum, replace the crankshaft.

9. INSPECT CRANKSHAFT OIL CLEARANCE

(a) Install the crankshaft bearings.

Click here

(b) Install the crankshaft thrust washers.

Click here

(c) Place the crankshaft on the cylinder block sub-assembly.

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

*a Plastigage

(e) Install the crankshaft bearing caps.

Click here

NOTICE:

Do not turn the crankshaft.

(f) Remove the crankshaft bearing caps.

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(g) Measure the Plastigage at its widest point.

Standard Oil Clearance:

0.026 to 0.049 mm (0.00102 to 0.00193 in.)

Maximum Oil Clearance:

0.049 mm (0.00193 in.)

NOTICE:

Remove the Plastigage completely after the measurement.

If the oil clearance is more than the maximum, replace the crankshaft bearing. If necessary, replace the crankshaft.

HINT:

If replacing a crankshaft bearing, select a new one with the same number. If the number of the crankshaft bearing cannot be determined, calculate the correct crankshaft bearing number by adding together the numbers imprinted on the cylinder block sub-assembly and crankshaft. Then refer to the following table for the appropriate crankshaft bearing number. There are 4 sizes of standard bearings, marked "1", "2", "3" or "4" accordingly.

(h) Perform the inspection for each journal.

10. INSPECT CRANKSHAFT BEARING CAP SET BOLT

(a) Using a vernier caliper, measure the outer diameter at position (A) shown in the illustration.

*a	Measurement Area (B)
*b	5.0 mm (0.197 in.)
*c	10 mm (0.394 in.)
	Measurement Location (A)

Standard Diameter:

10.73 to 10.97 mm (0.422 to 0.432 in.)

(b) Using a vernier caliper, measure the outer diameter within range (B) shown in the illustration at several locations.

(c) Calculate the difference between the measurement at position (A) and position (B).

Minimum Diameter:

The outer diameter difference is 0.3 mm (0.0118 in.)

11. INSPECT CONNECTING ROD BOLT

(a) Using a vernier caliper, measure the outer diameter at position (A) shown in the illustration.

*a	Measurement Area (B)
*b	5.0 mm (0.197 in.)
*c	10 mm (0.394 in.)
	Measurement Location (A)

Standard Diameter:

8.36 to 8.5 mm (0.329 to 0.335 in.)

(b) Using a vernier caliper, measure the outer diameter within range (B) shown in the illustration at several locations.

(c) Calculate the difference between the measurement at position (A) and position (B).

Minimum Diameter:

The outer diameter difference is 0.05 mm (0.00197 in.)

12. INSPECT OIL NOZZLE SUB-ASSEMBLY

(a) Push the check valve with a pin to check that it is not stuck. HINT: If the check valve is stuck, replace the oil nozzle sub-assembly.

*a Pin

(b) Apply air into (A). Check that air does not leak through (B). HINT: If air leaks, clean or replace the oil nozzle sub-assembly.

(c) Push the check valve with a pin while applying air into (A). Check that air passes through (B). HINT: If air does not pass through (B), clean or replace the oil nozzle sub-assembly.

*a Pin