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The following technical bulletins were published by AERA.
 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
 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 ELIMINATION
                                         Timing Chain Guide Elimination On
                                         1991-93 1.6L DOHC Nissan Engines

The AERA Technical Committee has received information concerning the elimination of two timing chain guides on 1991-93 1.6L DOHC engines. Beginning with engines produced in March 1993, the top and left side timing chain guides were eliminated.

All replacement cylinder heads Part #11040-57Y01, will not have the drilled holes to attach the chain guides. Those guides are not necessary and may cause an undesirable rattling noise when the timing chain contacts the guide.  To prevent a possible noise complaint, Nissan suggests removing the two guides shown in the illustrations below anytime cylinder head repair is done.

                                                                               The AERA Technical Committee
 NISSAN L24E CRANKSHAFT DIMENSION CHANGES
                                                 Dimension Changes On 
                                                Nissan L24E Crankshafts

The Nissan Motor Corporation made a production change in the size of the connecting rod journal diameter on the crankshafts in its L24E engines beginning in July, 1982.  Prior to this date the connecting rod journal diameter was 1.967 - 1.9675 (49.961mm - 49.974mm).  The company's later engines have a manufactured connecting rod journal diameter of 1.7701 - 1.7706 (44.960mm -
44.973mm).

In a similar fashion, the housing bore diameter of the connecting rods was reduced to accommodate the smaller connecting rod bearings.  The earlier style L24E engine connecting rods had a housing bore of 2.0866 - 2.0870 (53.00mm - 53.01mm).  The late style connecting rod produced by Nissan after July, 1982 has a housing bore diameter of 1.8894 - 1.9989 (47.99mm - 48.00mm).

The main bearing journal diameter remains the same at a specification of 2.1630 - 2.1636 (54.942mm - 54.955mm) for both the early and late crankshafts.


                                                                           The AERA Technical Committee
 TIMING CHAIN GUIDE BREAKAGE
                                 Timing Chain Guide Breakage On
                                 1989-94 Nissan 2.4L K24E Engines 

AERA members have reported occasional timing chain guide breakage on
1989-94 Nissan 2.4L K24E engines.  The broken guide was usually discovered because of poor performance or noisy sounding engine complaints.

The cause of this breakage may be due to constant inherent engine vibrations that caused the guide to fracture in the hold down bolt holes.  To reduce the likelihood of this reoccurring, Nissan has a revised chain guide Part #13085-40F10 and hold down bolts Part #13075-40F10.

The revised timing chain guide should be installed whenever the engine is rebuilt or the timing chain serviced.

                                                                               The AERA Technical Committee
 TIMING CHAIN OILER ON 2.4L K424 ENGINES
                                         Timing Chain Oiler On
                              1987-94 Nissan 2.4L KA24 Engines

The AERA Technical Committee offers the following information regarding a timing chain oiler used on 1987-94 Nissan 2.4L KA24 Engines. This engine uses a small oiling orifice in the front of the engine to oil the timing chains. It must be correctly orientated to the front of the block for proper chain oiling. The correct orientation is not contained in any known service manual. 

View the block from the front with the crankshaft down as it sits in the vehicle. When the oiler is correctly positioned, the two small oiling holes should point 
directly toward the engine?s left side main bearing cap mounting bolt which will also be approximately at the 5 o'clock position. 

Some oilers have a dot or indent located in the front face of the oiler. When it is correctly positioned in the block, that dot or indent should be located at a 
12 o'clock position. If this oiler is damaged or a replacement is required, it is available from Nissan with Part #14127-10W00.

The information in this bulletin has been obtained by viewing multiple engines before disassembly of that area.

                                                                                The AERA Technical Committee
 TIMING CHAIN RATTLING NOISE
                                         Timing Chain Rattling Noise On
                                             Nissan 1.6L GA16i Engines

AERA members report noise coming from the front of 1.6L GA16i Nissan engines.  The noise is most noticeable during engine cold start.  With the aid of a diagnostic engine stethoscope, this noise will be loudest at the cam sprocket cover.

This engine uses a timing chain tensioner located in the front cover.  Sludge that has built up in the chain tensioner or oil feed passage may restrict oil pressure from applying ample pressure to the timing chain.  Removing the front cover and chain tensioner will allow you access to check a .039 (1.0 mm) oil feed hole for sludge build up.  Clean and check the tensioner spring for ample resistance and replace tensioner if no resistance is felt.  

Complete the repair by installing a new front cover gasket, front cover, and torque bolts to 55-73 in. lbs.  Install a new, dry gasket for the timing chain tensioner and torque bolts to 108-168 in. lbs. 

                                                                          The AERA Technical Committee
 REVISED CYLINDER HEAD GASKET
                                    Redesigned Cylinder Head Gasket On
                                    Nissan 1.5L, 1.6L (E-15, E-16) Engines 

AERA member shops have reported increased cooling system benefits from the redesigned cylinder head gasket for the Nissan 1.5L and 1.6L (E-15, E-16) engines.  Along with the enhanced cooling, members report increased heater output in the interior of the vehicle.  

The new head gasket has altered the coolant passages and allows for increased flow to the front of the engine.  The redesigned head gasket has extended head gasket and engine life, as well as making the driver more comfortable. 

AERA recommends refering to the following illustrations and torque values when re-installing the new redesigned cylinder head gasket on the Nissan 1.5L and 1.6L (E-15, E-16) engines. 

Year Model                     Cylinder Head Torque Values

1982-1983..............?              ...29-33 ft. lbs. in
sequence..............?              ..then 51-54 ft. lbs. in sequence

1984-1986.............................54 ft. lbs. in sequence

1987.......?                        ..22 ft. lbs. in sequence............51 ft. lbs. in
                                       sequence...........loosen bolts completely......retorque to
                               22 ft. lbs. in sequence.......and then 51-54 ft. lbs. In sequence.

                                                                              The AERA Technical Committee