PAD AS 1R1448 - Caterpillar

(7FB, 8TC, 4MG, 3ZJ, 5KJ, 2EK, 8PN, 92U),
3406E (5EK) Truck EnginesReference: Truck Engine News, August 1993, Page 2, "Correct Camshaft Idler Gear Shaft/Bolts". New 7C-6697 and 114-0120 Service Repair Camshaft Idler Gear Shafts are available as a repair option for cylinder blocks with damaged pilot bores. The new 7C-6697 Service Repair Camshaft Idler Gear Shaft is for 3406/B/C (7FB, 8TC, 4MG, 3ZJ, 5KJ, 2EK, 8PN, 92U) Truck Engines. The new 114-0120 Service Repair Camshaft Idler Gear Shaft is for 3406E (5EK) Truck Engines. The service repair shafts have a longer [11.0 mm (.43 in) versus 8.42 mm (.331 in)] shaft pilot. If the original 4N-0345, 7C-6357, 6I-0093 or 6I-3632 Camshaft Idler Gear Shafts elongate or distort the pilot bore, the longer pilot length of the service repair shaft should engage the undamaged portion of the pilot bore. This should allow repair of a damaged cylinder block without replacing the complete cylinder block in most cases.
A service repair camshaft idler gear shaft should ONLY be used when the pilot bore in the cylinder block is damaged enough that the original shaft cannot be used.