Engine/Transmission - Replacement Precautions

Classification:
EM03-001

Reference:
NTB03-093

Date:
October 8, 2003

CAUTION DURING ENGINE OR TRANSMISSION REPLACEMENT

APPLIED VEHICLES:
All Nissan

SERVICE INFORMATION

^ Improper or incorrect service and repair procedures may cause damage to new or repaired parts and components.

^ Damage to repaired or replaced engine, transmission, or other components caused by improper procedures during repair or replacement is not covered by warranty.

^ This TSB contains information to help you avoid damaging these parts and components.

Cylinder Block - Transmission Dowel Pins





1. Alignment dowels are installed between the cylinder block and transmission.

^ They ensure accurate alignment of the crankshaft to the transmission input shaft.

2. If you replace an engine or transmission you must confirm that the dowels are installed correctly during re-assembly.

^ Improper alignment caused by missing dowels may cause vibration, oil leaks or breakage of drive-train components.

Torque Converter Pilot (A/T) Pilot Bushing (M/T)





1. Some automatic transmission equipped vehicles use a torque converter pilot.

^ This pilot is pressed into the rear of the crankshaft.

^ It supports the torque converter.

2. Some manual transmission equipped vehicles use a pilot bushing.

^ This bushing supports the end of the transmission input shaft.

^ Having the correct pilot installed will ensure proper alignment at re-assembly.

3. If you replace an engine (or an engine crankshaft) on a vehicle that uses a Pilot Bushing or Converter Pilot, you must make sure the new parts have the correct pilot installed.

^ Vibration and/or hard shifting may result if the correct pilot is not installed.

Debris in the Intake and Exhaust System

1. Whenever an engine is replaced (short or long block) or repaired:

^ You must make sure that the intake and exhaust system components are cleaned out.

^ They must be completely free of debris, water, or other "foreign material."

^ Anything like that left in the intake or exhaust system will probably cause engine damage.

^ If a piston or valve was broken on the old engine, it is likely that metal debris will be found in both the intake and exhaust systems.

2. Review the following cleaning recommendation for the intake and exhaust Systems when you replace or repair an engine:

^ Visually inspect for debris, water, or other foreign material inside the entire intake system, from the air filter intake through the intake manifold; clean as needed.

^ Inspect the intake manifold "runners" from the cylinder head side. Make sure that no particles of metal (broken pieces of piston, valve, etc) have stuck to the walls of the runners.

^ Visually inspect the "flange" portion of the manifold, where it attaches to the head. Make sure there are no scratches or burrs that might interfere with good sealing.

^ Visually inspect the "power valves" inside the intake manifold (if applicable). Make sure all retaining screws that attach the "butterflies" to the shaft are in place and tight.

^ Make sure the exhaust ports are clean and free of debris.

^ Inspect the entire exhaust system for debris or other foreign material. Clean or replace as needed.

Oil Pressure at "New or Repaired" Engine Start-Up

Before a new service engine is started for the first time, "prime" the oil system as follows:

1. After filling, allow a few minutes for the oil to drain down to the oil pan before measuring.

^ Be sure the vehicle is level.

^ Confirm the oil is filled to the "H" (full) mark on the dipstick.

NOTE:
Some models require as much as 10 minutes wait time for oil to drain to the pan. See the LU or MA section of the appropriate Service Manual (ESM).

2. Remove the fuse for the fuel pump.

3. Crank the engine for about 10 seconds or until the oil pressure warning light goes out.

(Do not crank the engine for more then 10 seconds at a time.)

4. Reinstall the fuel pump fuse and start the engine.

5. Inspect for oil, fuel, or water leaks.

6. Confirm normal engine and transmission operation.

Finally, inspect your work to confirm that all wires, hoses, trim, etc. are properly located and secure.