Service manual

G420F(FE) Service Manual Chapter 3. Engine Mechanical System
105
Inspection
Connecting Rod and Crankshaft
1. Check the connecting rod end play. Using feeler
gauge, measure the end play while moving the
connecting rod back and forth.
Standard end play:
0.1~0.25 mm (0.004~0.010in.)
Maximum end play: 0.4 mm (0.016in.)
• If out-of-tolerance, install a new connecting rod
• 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 the 2 connecting rod cap nuts.
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 nuts.
Tightening torque
50~53 Nm(500~530kgf.cm,36.9~39lbf.ft)
NOTE: Do not turn the crankshaft.
7) Remove the 2 nuts, connecting rod cap and
bearinghalf.
8) Measure the plastigage at its widest point.
Standard oil clearance
0.024 ~ 0.042mm (0.0009 ~ 0.0017in.)
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 deter gent.