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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 | |
INCREASED THROTTLE EFFORT GM 4.8L, 5.3L & 6.0L ENGINE | Increased Throttle Effort On
1999-2001 GM 4.8, 5.3 & 6.0L VIN T, U & V Engines
The AERA Technical Committee offers the following information regarding a possible sticky throttle effort on 1999-2000 GM 4.8, 5.3 & 6.0L VIN V, T & U engines. The first symptom of this condition is an increased effort to depress the accelerator pedal.
A tight throttle blade in the throttle body bore may cause this condition while it is in the closed position. Replacing the throttle body if the unit is built before the Julian Date Code of 2979 (Figure 1) must be implemented to repair this condition. If the unit is built after the Julian Date Code 2979 all other possible causes such as a binding or damaged throttle cable should be investigated.
Do not attempt adjustment of the shipping air screw to rotate the throttle body blade away from the throttle body bore. Adjusting the shipping air screw compromises the idle speed control and may lead to other derivability concerns. Adjusting the shipping air screw may lead to reduced Idle Air Control valve durability. There are eight different throttle body assemblies affected. Refer to the chart below to determine replacement numbers.
Model Year Part Number Description
1999 17113597 Throttle Body, 4.8L V-8 w/Manual Transmission
1999 17113583 Throttle Body, 4.8 & 5.3L w/Auto Transmission
1999 17113558 Throttle Body, 6.0L w/Auto Transmission
1999 17113599 Throttle Body, 6.0L w/Manual Transmission
2000 17113639 Throttle Body, 4.8L V-8 w/Manual Transmission
2000 17113665 Throttle Body, 4.8 & 5.3L w/Auto Transmission
and without Traction Control
2000 17113640 Throttle Body, 6.0L w/Manual Transmission
2000 17113652 Throttle Body, 6.0L w/Auto Transmission
and without Traction Control
Interpreting the Julian Date Code is as follows.
Example Date Code 2979. The first three digits indicate the number of day in calendar year. The last digit indicates the year that applies.
8 = the year 1998
9 = the year 1999
0 = the year 2000
1 = the year 2001
The AERA Technical Committee | |
COOLANT LEAKAGE ON 3.8L VIN K ENGINES | Coolant Leakage On
1995-2000 GM 3800 VIN K Engines
The AERA Technical Committee offers the following information concerning coolant leakage on 1995-2000 GM 3.8L VIN K engines. The information in this bulletin resulted from continued customer complaints about loss of engine coolant over a period of time. In most instances, coolant usage gradually increased without a determination of where it was going.
The coolant leaks in these situations have been reported leaking from the upper plastic intake plenum. This plenum cracks or erodes in the coolant transfer hole that is supplied coolant from the lower intake manifold as shown in Figure 1. Two straws are inserted in this passage to illustrate where the coolant transfer ports are. Those passages actually provide a route for coolant to go into the throttle body area.
This particular failure usually starts by an unexplained small amount of coolant loss. Customers complain that they always have to top off the coolant. Until, the leakage increases to an amount that will finally provide an air, fuel and coolant mixture that will not support combustion. When that occurs, the engine goes into a no start situation and the plastic plenum must be replaced.
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## | |
BALANCE SHAFT NOISE ON 4.3L VIN W & X | Balance Shaft Noise On
1992-2000 GM 4.3L VIN W & X Engines
The AERA Technical Committee offers the following information regarding balance shaft noise for 1992-2000 GM 4.3L VIN W & X engines. This information should be used to assist diagnosing audible noise conditions described as a rattle noise or spark knock, etc.
This noise may occur in the 2000-2500 rpm range while under a moderate to heavy load and the engine coolant temperature is at operating temperature. According to GM engineering, this noise may be due to a natural torsional vibration in the cam drive system while loading and unloading of the balance shaft gear drive assembly occurs.
GM engineers have also concluded that this noise does not present any durability risks to the engine or any of its components. Attempts to resolve this noise condition by changing cam drive or balance shaft components may prove unsuccessful. It is imperative that all normal diagnostic techniques be followed to assure that the rattle noise is not spark knock, piston rattle, bearing knock or some other noise for which repairs should be made.
The AERA Technical Committee | |
CRANKSHAFT REPLACEMENT CAUTION FOR 1998-2003 GM ENGINES | Crankshaft Replacement Caution For
1998-2005 GM 4.3, 4.8, 5.3, 5.7 & 6.0L Engines
The AERA Technical Committee offers the following information on crankshaft replacement caution for 1998-2003 GM 4.3, 4.8, 5.3, 5.7 and 6.0L engines. Design changes in the flywheel flange thickness have been made to some crankshafts used in the above-mentioned engines. This bulletin is being re-published with additional information.
The later crankshafts are shorter on the flywheel flange as seen in the listing below. These changes are due to the many different vehicle / transmission combinations being built by GM.
A flywheel spacer ring GM Part #12563532 and a longer bolt set GM Part #12563533 is required when using a thin flange crankshaft to replace a thick flange crankshaft. Also, if the crankshaft is being used in a vehicle, which is a standard shift application, you also need pilot bushing GM Part #12557583 or 12479894.
Note: GM part numbers correct as of 12-18-04.
Years Liters Casting # Trans Flange Thickness
1998 early 4.3L 236, 255 V-6 1.62 thick flange
1998+up 4.3L 236, 255 V-6 1.500 thick flange
1999-2000 4.8L 312 V-8 M/T 1.250 thick flange
1999-2000 6.0L 215 V-8 1.250 thick flange
1999-2005 4.8L 482 V-8 A/T .857 thick flange
2001-2005 4.8L 482 V-8 M/T .857 thick flange
1999-2005 5.3L 216 V-8 A/T .857 thick flange
1997-2005 5.7L 216 V-8 .857 thick flange
2001-2005 6.0L 216 V-8 .857 thick flange
All GEN III crankshafts used in Camaro, Corvette and Firebird have a .857 thick flange and also have a freeze plug installed at the bottom of the pilot shaft hole. The 4.8, 5.3 + 6.0L don?t have the freeze plug. The drilled hole thru the centerline of the 5.7L LS1 & LS6 crankshafts allows a path to balance crankcase pressure within the lower crankcase. Doing so has eliminated possible oil consumption when the engine is operated over 4800 RPM.
Caution: Early crankshafts use a flat reluctor wheel and late have a recess. Recess will work on all years. Do not use a flat reluctor on late applications as it will cause an engine misfire.
The AERA Technical Committee |
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