Express 1/2 Ton Van V8-5.7L VIN R (1999)
Discoloration, ranging from light brown to black, is caused by incorrect lubrication or moisture. Reuse the bearing if you can remove the stains with
light polishing. Reuse the bearing if there is no evidence of overheating. Check the seals and the related parts for damage.
HEAT DISCOLORATION
Heat discoloration ranges from faint yellow to dark blue. This discoloration results from overload or an incorrect lubricant. Excessive heat causes
softening of the races or the rollers. In order to check for loss of temper on the races and the rollers, perform a file test. A file drawn over a tempered
part will grab and cut the metal. A file drawn over a hard part will glide readily with no metal cutting. Replace the bearings if overheating damage is
indicated. Check the seals and the other related parts.
MISALIGNMENT
The outer race is misaligned due to a foreign object. Clean the related parts. Replace the bearing. Ensure the races are properly sealed.
CRACKED INNER RACE
