The engine in the Cat 973D
The Cat C9 fitted to the Cat 973D is a 8.8L / 537 cu in 6-cyl inline diesel, 112 x 149 mm bore and stroke, rated at @ 1800–2200 rpm, built to Tier 3/4 emissions. If you are replacing the engine in a Cat 973D, this is what you need. Call us with your engine serial number and we will confirm the exact fit before you buy.