Crankshaft: Testing and Inspection

Inspection

Connecting Rod And Crankshaft
1. Check the connecting rod end play.
Using a feeler gauge, measure the end play while moving the connecting rod back and forth.

Standard end play : 0.1 - 0.25mm(0.004 - 0.010in.)
Maximum end play : 0.35mm(0.0138in.)





A. If out-of-tolerance, install a new connecting rod.
B. If still out-of-tolerance, replace the crankshaft.
2. Check the connecting road bearing oil clearance.
(1) Check the matchmarks on the connecting rod and cap are aligned to ensure correct reassembly.
(2) Remove 2 connecting rod cap bolts.
(3) Remove the connecting rod cap and bearing half.
(4) Clean the crank pin and bearing.
(5) Place plastigage across the crank pin.
(6) Reinstall the bearing half and cap, and torque the bolts.

Tightening torque
19.6N.m (2.0kgf.m, 14.46lb-ft) + 90°


NOTE:
Do not turn the crankshaft.

(7) Remove 2 bolts, connecting rod cap and bearing half.
(8) Measure the plastigage at its widest point.

Standard oil clearance
0.028 - 0.046mm(0.0011 - 0.0018in.)





(9) If the plastigage measures too wide or too narrow, remove the upper half of the bearing, install a new, complete bearing with the same color mark (select the color as shown in the next column), and recheck the clearance.

CAUTION:
Do not file, shim, or scrape the bearings or the caps to adjust clearance.

(10) If the plastigage shows the clearance is still incorrect, try the next larger or smaller bearing (the color listed above or below that one), and check clearance again.

NOTE:
If the proper clearance cannot be obtained by using the appropriate larger or smaller bearings, replace the crankshaft and start over.

CAUTION:
If the marks are indecipherable because of an accumulation of dirt and dust, do not scrub them with a wire brush or scraper. Clean them only with solvent or detergent.

Connecting Rod Mark Location




Discrimination Of Connecting Rod






Crankshaft Pin Mark Location Discrimination Of Crankshaft




Discrimination Of Crankshaft






Place Of Identification Mark (Connecting Rod Bearing) Discrimination Of Connecting Rod Bearing




Discrimination Of Connecting Rod Bearing





(11) Selection





3. Check the crankshaft bearing oil clearance.
(1) To check main bearing-to-journal oil clearance, remove the main caps and bearing halves.
(2) Clean each main journal and bearing half with a clean shop tower.
(3) Place one strip of plastigage across each main journal.
(4) Reinstall the bearings and caps, then torque the bolts.

Tightening torque
26.46N.m (2.7kgf.m, 19.52lb-ft) + 45°


NOTE:
Do not turn the crankshaft.

(5) Remove the cap and bearing again, and measure the widest part of the plastigage.

Standard oil clearance
0.020 - 0.038mm (0.0008 - 0.0015in.)





(6) If the plastigage measures too wide or too narrow, remove the upper half of the bearing, install a new, complete bearing with the same color mark (select the color as shown in the next column), and recheck the clearance.

CAUTION:
Do not file, shim, or scrape the bearings or the caps to adjust clearance.

(7) If the plastigage shows the clearance is still incorrect, try the next larger or smaller bearing (the color listed above or below that one), and check clearance again.

NOTE:
If the proper clearance cannot be obtained by using the appropriate larger or smaller bearings, replace the crankshaft and start over.

CAUTION:
If the marks are indecipherable because of an accumulation of dirt and dust, do not scrub them with a wire brush or scraper. Clean them only with solvent or detergent.

Connecting Rods
1. When reinstalling, make sure that cylinder numbers put on the connecting rod and cap at disassembly match. When a new connecting rod is installed, make sure that the notches for holding the bearing in place are on the same side.
2. Replace the connecting rod if it is damaged on the thrust faces at either end. Also if step wear or a severely rough surface of the inside diameter of the small end is apparent, the rod must be replaced as well.
3. Using a connecting rod aligning tool, check the rod for bend and twist. If the measured value is close to the repair limit, correct the rod by a press. Any connecting rod that has been severely bent or distorted should be replaced.

Allowable bend of connecting rod :
0.05mm / 100mm (0.0020 in./3.94 in.) or less
Allowable twist of connecting rod :
0.1mm / 100mm (0.0039 in./3.94 in.) or less


Crankshaft bore mark location

Letters have been stamped on the block as a mark for the size of each of the 5 main journal bores.

Use them, and the numbers or bar stamped on the crank (marks for main journal size), to choose the correct bearings.




Discrimination Of Cylinder Block






Crankshaft Journal Mark Location Discrimination Of Crankshaft




Discrimination Of Crankshaft






Place Of Identification Mark (Crankshaft Bearing) Discrimination Of Crankshaft Bearing




Discrimination Of Crankshaft Bearing





Selection





4. Check crankshaft end play.
Using a dial indicator, measure the thrust clearance while prying the crankshaft back and forth with a screwdriver.

Standard end play
0.07 - 0.25mm (0.0027 - 0.0098in.)
Limit : 0.30mm (0.0118in.)





If the end play is greater than maximum, replace the thrust bearings as a set.

Thrust bearing thickness
1.925 - 1.965mm(0.0758 - 0.07736in.)


5. Inspect main journals and crank pins
Using a micrometer, measure the diameter of each main journal and crank pin.

Main journal diameter : 51.942 - 51.960mm (2.0449 - 2.0456in.)
Crank pin diameter : 47.954 - 47.972mm (1.8879 - 1.8886in.)