When diagnosing a low power problem, first troubleshoot the air and fuel systems to make sure the engine is receiving adequate intake air and fuel. Check the intake air system for leaks. Make sure a sealant is used on the through-hole capscrews which secure the manifold cover to the head. Verify the turbocharger is operating… Read More »
The sound emitted from the overhead can indicate a valve train problem. Loose rocker levers will clatter. A squeaking noise can mean lack of lubrication for adjusting screw and the push rod socket. Caution: If one of the individual support pedestals is removed during inspection or repair, all head bolts must be retightened according to… Read More »
The rear crankshaft seal is mounted in a housing that bolts to the rear of the cylinder block. Double lipped Teflon seals are used. The sealing surface on the crankshaft must be clean and free of lubricating oil during installation of the seal.
A front sump, rear sump or center sump lubricating oil pan option may be used depending on the application. The mounting of the lubricating oil pick up tube will vary with the lubricating oil pan used.
We have discussed the cylinder block relative to cooling and lubrication in those respective systems. We have also discussed the interfaces of some of the above power functions with the block. This discussion will cover the remaining interfaces including the cylinder bores. The cylinder bores are machined directly into the cylinder block during production. The… Read More »
The crankshaft is a balanced, forged steel unit. Four cylinder engines have 5 main bearings. Six cylinder engines have 7 main bearings. The lower bearing shells are all the same. All of the upper bearing shells are also the same with the exception of the journal adjacent to the rear one. The next to the… Read More »
Piston features include: high swirl combustion bowl cast aluminum body and 3 ring grooves. The piston for turbo charged, turbocharged/aftercooled engines includes a ni-resist insert with a keystone profile for the top piston ring. Always check the part number to be sure the correct configuration is used during piston replacement. In addition to the ni-resist… Read More »
Several optional flywheel housing and flywheels are used depending on the application. Ring dowels are used to locate the housing within 0.20 mm [0.008 in] TIR. NOTE: Service housings are drilled, Re-dowelling is not required. Some flywheel housings are machined for the use of an optional engine barring device.
The camshaft is gear driven from the crankshaft. A replaceable bushing is used for the front journal to carry the side loading from the accessory drive. The remainder of the journals operate in cast iron bores in the cylinder block; however, these bores can be repaired in a machine shop by installing service bushings. The… Read More »
The front crankshaft seal is mounted in the front gear cover. A double lipped Teflon seal is used. The sealing surface on the crankshaft must be clean and free of lubricating oil during assembly.