Achieva L4-144 2.4L DOHC VIN T SFI (1996)
1. Clean the bearings in cleaning solvent. Remove the varnish, sludge and dirt.
2. Inspect the bearings for the following conditions:
-
Gouges
-
Scoring
-
Discoloration
BALANCE SHAFT BEARING CLEARANCE MEASUREMENT
Method A
1. Use a micrometer in order to measure the balance shaft journal diameter in several places approximately 90 degrees apart. Average the
measurements.
IMPORTANT: Method A yields measurements from which the bearing clearance can be computed. Method B yields the bearing clearance
directly. Method B does not indicate bearing or journal runout. Do not mix inserts of different nominal size.
2. Compute the taper and runout to ensure they are within the specification limits.
3. Use an inside micrometer in order to measure the bearing insert ID. If you are replacing the inserts, measure using the new inserts.
4. Subtract the bearing measurement from the journal diameter in order to get the clearance. Refer to specifications for allowable limits.
Method B
1. Wipe all of the oil off of the balance shaft journal and the bearing surfaces.
2. Place a piece of gauging plastic across the entire journal surface.
IMPORTANT: Do not rotate the shafts after the gauging plastic has been placed on the journals. If the shafts are rotated the gauging plastic will
smear, making the readings wrong.
3. Assemble the upper and lower housings and tighten all the fasteners in sequence to specification.
4. Disassemble the housing.
5. Measure the flattened plastic at the widest point with the scale on the gauging plastic package. The plastic will be wider on the journal end away
from the counter weight. This is because the journals are purposely tapered.
6. Remove all of the gauging plastic from the bearing and or journal.
7. Compare the measurements to engine specifications.
BALANCE SHAFT THRUST PLATE INSPECTION
1. Clean all parts in cleaning solvent. Remove the varnish, sludge and dirt.
2. Inspect the trust plate for the following conditions:
-
Gouges
-
Burrs
BALANCE SHAFT DRIVE CHAIN INSPECTION
1. Clean the balance shaft drive chain parts in cleaning solvent. Remove the varnish, sludge and dirt.
2. Inspect the balance shaft drive chain for the following conditions:
-
Damaged links
-
Worn or missing rollers
3. Replace the chain and sprockets if the chain tension cannot be adjusted to specification before the chain hits the housing or the guide comes to the
end of its travel.
