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The following technical bulletins were published by AERA.
 TIMING AREA OIL LEAKS ON '90 VG30
                                               Timing Area Oil Leaks On
                                             1990 Nissan VG30 Engines

When checking for the source of an oil leak in the timing cover area of 1990 Nissan VG30 engines used in 300ZX automobiles, be sure to check the auto tensioner for leaks.

Nissan has revised the auto tensioner, Part #13070-45V01, by relocating the oil holes and reducing the clearance between the tensioner body and piston (see illustration).  The new tensioner is available under Part #13070-45V03.

Rebuilders should verify that only the revised auto tensioner is installed on rebuilt engines.

For additional information see AERA Technical Bulletins: TB 653 & 601


                                                                          The AERA Technical Committee
 REVISED CYL HEAD & BLOCK ON 1987-UP ENGINES
                Revised Cylinder Head & Block On
               1987-Up Nissan 3.0L (VG30) Engines


Beginning with April, 1987 production, the cylinder heads and
block have been changed on Nissan 3.0L (VG30) engines. 
Improvements were made to increase power output and decrease
noise levels of the engine.

Revised production engines can be identified by an engine serial
number that ends in W, such as XXXXXX W.  Former engine serial
numbers end in either A or B.  However, factory service
cylinder blocks will not carry the W identification even though
they feature the improvements listed below.  A visual check is
necessary for proper identification.

Six new water galleries were added to the cylinder block (Figure
1) and the cylinder heads (Figure 2).  This change required a
modification of the cylinder head gasket, where the original 6
water holes were downsized and 3 new holes added on the exhaust
side of the gasket (Figure 3).  The revised cylinder head gasket
can also be identified by its differing identification tab. 
Figure 4 best illustrates the former and revised head gaskets.

Additional changes were made throughout the engine.  The pistons
now use full floating, larger diameter wrist pins.  The small end
bore of the connecting rod was increased to accept the larger
wrist pin.  The revised rod is also heavier than the former part. 
Again, components are identified by a W stamp. 

Nissan advises against the use of former parts when servicing
vehicles with engines manufactured as of April 1987.  Refer to
the chart to determine the proper component combination when
servicing engines manufactured prior to April 1987 (Figure 5).

For additional information see AERA Technical Bulletins: TB 601,
653 & 752


                                     The AERA Technical Committee


      Cylinder   Head     Cylinder   Short   Acceptable
        Head    Gasket      Block    Block   Combination

       Revised  Former     Former     N/A        Yes
       Former   Former     Revised    N/A        Yes
       Former   Former     Former     N/A        Yes
       Revised  Revised    Revised    N/A        Yes
       Revised  Former     Revised    N/A        Yes
       Revised  Revised    Former     N/A        No
       Former   Revised    Revised    N/A        No
       Former   Revised    Former     N/A        No
       Former   Former       N/A    Revised      Yes
       Revised  Revised      N/A    Revised      Yes
       Revised  Former       N/A    Revised      Yes
       Former   Revised      N/A    Revised      No




April 1991 - TB 761

##END##
 REVISED CRANKSHAFT
                      Revised Crankshaft On
                   1984-87 Nissan VG30 Engines


Nissan has revised the snout of the crankshaft and related
service parts for VG30 engines manufactured after April 1987. 
Since only the revised crankshaft is being serviced by Nissan,
should it become necessary to use this crankshaft in 1984-1987
engines, several associated parts also need to be changed. 
Engines manufactured prior to April 1987 carry a serial number
that ends in either 'A' or 'B'.


Component                Prior to            As of
Description              April 1987          April 1987


Crankshaft               12201-02P80 1       12201-02P81 2
Bolt Spacer              Not Required        12308-V5321
Crank Pulley Bolt Washer 12308-V5000 3       12308-77A00
                         12308-V5001 3
                         12308-V5010 3
Crank Pulley Bolt        12309-V5000         12309-16V00


1    Does not include crankshaft pulley bolt washer or
     crankshaft pulley bolt.
2    Includes crankshaft bolt spacer, crankshaft pulley bolt and
     crankshaft pulley bolt washer.
3    Complete application information available on parts
microfiche


The front pulley assembly is the same for either crankshaft.


                                     The AERA Technical Committee


March 1991 - TB 752

##END##
 REVISED TIMING COMPONENTS
                                  Revised Timing Components On
                                       1988 Nissan Z24I Engines
 
Nissan has revised the timing components used in 1988 and later Z24I engines.  The actual production change was instituted in January of 1988.  

The chain assembly was updated from a single roller to a double roller type.  This update requires a new crankshaft and camshaft sprocket as well as the new double roller chain.  The tensioner assembly and chain guides have not been changed.  Engines manufactured prior to January 1988 may be serviced with the new components as long as all three pieces are used.

                                                                         The AERA Technical Committee
 INJECTOR NOZZEL SERVICE
                                      Injector Nozzle Service On
                                      Nissan SD Series Engines

Nissan has revised the lower fuel injector gasket on their SD series diesel engines.  

This engine was introduced in 1981 as the SD-22 with a displacement of 2.2L.  In 1984 the cylinder bore diameter was increased to bring engine displacement to 2.5L.  This engine, the SD-25, was last used as part of the 1986 model year.

Nissan recommends replacement of both upper and lower fuel injector gaskets whenever the injector assembly is removed from the cylinder head.  Be sure to position the lower gasket with the convex edge toward the combustion chamber (see Illustration).

                                                                         The AERA Technical Committee
 COOLANT IN THE ENGINE OIL
                                          Coolant In The Engine Oil In
                                     1989-99 Nissan 2.4L KA24 Engines

AERA members have reported engine coolant in the engine oil supply in 1989-99 Nissan 2.4L KA24 engines. Vehicle owners have expressed engine-overheating complaints and loss of engine coolant. The source of this coolant loss has not been the cylinder head, which is most often first suspected. Removal of the cylinder head may not be necessary if the information in this bulletin is first considered.

These engines use a timing chain to rotate the single or dual camshaft design used.  If that chain is allowed to run loose, it may contact the front cover and wear a hole into the aluminum cover allowing coolant to enter the crankcase. To determine if this condition is present, some technicians have detected the area of leakage by attempting to pressurize the cooling system. Before any pressure builds up, an audible hissing noise has been noticed and verified with a stethoscope at the engine?s front cover. 

For more information on this engine?s timing chain tensioner, see TB-1652

                                                                                The AERA Technical Committee
 ENGINE COOLANT LEAKS ON 2000-2002 NISSAN 3.3L ENGINES
                                              Engine Coolant Leaks On
                                       2000-02 Nissan 3.3 VG33E Engines

The AERA Technical Committee offers the following information regarding an engine coolant leak on 2000-02 3.3 VG33E engines. Customers may complain of engine coolant under the vehicle if sitting for a period of time or the smell of coolant when the engine is warm.

A leak between the intake manifold and the water outlet housing as shown below in Figure 1 may be causing this condition. Visually inspecting this area could verify that this is the source of the leak. 

To cure this problem, Nissan offers a revised fiber gasket, Part #11062-9Z000, to be installed between the water outlet and the intake manifold. When changing this gasket, make sure that you have drained the coolant just below the level of the water outlet. This will keep coolant from spilling when removing the housing. 

Clean the sealing surface of the water outlet housing and the intake manifold to get rid of any old sealer that may be present. Install the two mounting bolts through the outlet housing and then slide the fiber gasket over the bolts until it is flush with the sealing surface of the housing. 

Once the housing is installed onto the intake manifold, tighten the mounting bolts to a torque of 12-15 ft/lbs. Refill the cooling system and run the vehicle to verify that there are no further coolant leaks. 
 
                                                                           The AERA Technical Committee
 SEIZED CAMSHAFTS
                                                 Seized Camshafts On
                                        Nissan SOHC VG30 3.0L Engines

AERA has received reports of sudden camshaft seizures on Nissan SOHC VG30 3.0L engines.  This seizure is uncommon because the cause of the failure is a broken cylinder head bolt.  The head of the bolt breaks off and then becomes lodged under one of the cam lobes, resulting in the timing belt either breaking or stripping. 

If this type of failure occurs, removal of valve covers will reveal that the bolt head is lodged underneath the camshaft. Further engine disassembly is now necessary as this is a non-freewheeling engine.  Bent valves can be encountered on both cylinder banks, even if only one camshaft as seized.

For additional information see AERA Technical Bulletin: TB 601 &
TB 653

                                                                         The AERA Technical Committee
 TIMING CHAIN GUIDE BREAKAGE
                                        Timing Chain Guide Breakage On
                                       1989-95 Nissan 1.6L GA16 Engines 

AERA members have reported occasional timing chain guide breakage on
1989-95 Nissan 1.6L GA16 engines.  The broken guide was usually discovered after complaints of poor performance or noise in the front of the engine. This condition may apply to both SOHC and DOHC engines.

The cause of this breakage may be due to constant inherent engine vibrations that caused the guide to fracture.  To reduce the possibility of this reoccurring, Nissan has a revised chain tension guide and hold down bolt. The tensioner guide is available under Part #13085-77A04 for SOHC and Part #13085-0M300 for the DOHC engine. The hold down bolts are available under Part #08120-8161E or #08129-81628.

The revised timing chain guide and bolt should be installed whenever the engine is rebuilt or the timing chain replaced. 

                                                                            The AERA Technical Committee
 RECESSED INTAKE VALVE SEATS
                                        Recessed Intake Valve Seats On
                                     1990-91 Nissan 3.0L VG30E Engines

AERA members have reported valve seat recession on 1990 Nissan 3.0L VG30E engines. Symptoms include intermittent misfire, hard starting and lack of 
power. In most instances this recession is noticed during the 60-80,000 mile period.

Diagnosing these symptoms using cranking compression tests has proved to be inconclusive, as successive tests have shown different results. Cold and hot 
engine temperatures also exhibit varying symptoms as the engine warms up and valves do not fully close.

The reported cause of this condition is an unseated intake valve, resulting from valve seat recession. Apparently the valve seat alloys used during 1990-91 
model year were not properly comprised. The earlier and later engines do not seem to exhibit this condition. 

To repair this type of condition properly, replacement of all intake valve seats and usually all intake valves is necessary.

                                                                          The AERA Technical Committee