Infiniti G35x Sedan AWD V6-3.5L (VQ35DE) Technical Service Bulletin # 03-062A Date: 040319
Engine/Transmission - Precautions During Replacement
Classification:
EM03-002a
Reference:
ITB03-062a
Date:
March 19, 2004
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CAUTION DURING ENGINE OR TRANSMISSION REPLACEMENT
This bulletin amends ITB03-062. This version amends the Service Information. Please discard all paper copies of the earlier version.
APPLIED VEHICLES:
All Infiniti
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 make sure 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.
Crankshaft - Drive Plate / Flywheel Alignment Dowel Pin
1. Most late model engines have an alignment dowel installed in the rear of the crankshaft.
^ This dowel is used to properly align (locate) the drive plate or flywheel with the crankshaft.
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2. If you replace an engine that uses this dowel make sure the dowel is installed during re-assembly.
3. On engines that use this dowel:
^ During re-assembly the drive plate / flywheel locating hole must be aligned with this dowel for proper operation of the engine control
system.
^ If not aligned (clocked) correctly rough running and MIL ON will occur.
Torque Converter Pilot (A/T)
Pilot Bushing (M/T)
1. Either bushing above is "pressed" into the rear of the crankshaft.
^ This ensures proper alignment at re-assembly.
2. Some automatic transmission equipped vehicles use a torque converter pilot.
^ It supports the torque converter.
3. Some manual transmission equipped vehicles use a pilot bushing.
^ This bushing supports the end of the transmission input shaft.
4. If you replace an engine (or an engine crankshaft) on a vehicle that uses a Pilot Bushing or Converter Pilot you must make sure that the correct
pilot is installed: Automatic Transmission pilot Vs Manual Transmission pilot.
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 (short or long block) is replaced or repaired note the following:
^ You must make sure that the intake and exhaust system components are cleaned out.
^ They must be completely free of debns water or other foreign matenal.
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^ 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 debns 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 range portion of the manifold where it attaches to the head. Make sure there are no scratches or burrs that might cause
a bad seal.
^ 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.
Final Quality Check:
Inspect your work to confirm that all wires hoses tnm etc. are properly located and secure. This helps to prevent comebacks and unhappy customers.
