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Infiniti  Engine Information

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The following technical bulletins were published by AERA.


                                 Main Bolt Torque & Tightening Sequence On
                                           1990-96 Infiniti 4.5L VIN N Engines

The AERA Technical Committee offers the following information regarding the main bolt torque and tightening sequence on 1990-96 Infiniti 4.5L VIN N engines. The correct procedures to remove and install the main bearing caps are critical for this engine. If the proper sequence and torque during installation is not followed, engine damage may result.

To correctly remove the main bearing cap bolts, loosen them in the sequence shown below in Figure 1. Do not use an air wrench in this procedure as it may 
pull bolt hole threads during the process.

To correctly tighten the main bearing cap bolts refer to the procedure and sequence shown in Figure 2. 

Step 1. Tighten nuts numbered 1, 2 & 5-10 to 32-36 ft.lbs (43-49 N.m) 
Step 2. Tighten nuts numbered 3, 4 & to 30-34 ft.lbs (41-46 N.m)
Step 3. Tighten nuts numbered 11 through 20 to 14-18 ft.lbs (19-24 N.m)
Step 4. Tighten nuts numbered 1, 2 & 5-10 to 81-85 ft.lbs (110-115 N.m)
Step 5. Tighten nuts numbered 3 & 4 to 80-84 ft.lbs (109-114 N.m)
Step 6. Tighten nuts numbered 11 through 20 to 30-34 ft.lbs (41-46 N.m)
Step 7. Tighten nuts numbered 21 through 30 to 34-38 ft.lbs (46-52 N.m)

                                                                           The AERA Technical Committee


                                          Interference Engines

The AERA Technical Committee would like to offer the following information on engines that present the possibility of interference between pistons and valves. The interference or contact may bend valve(s) when the timing between the camshaft and crankshaft is interrupted. This is generally the result of a timing belt or chain breaking or slipping.

The following list are engines that AERA is currently aware of that have exhibited interference. There may be other engines that are not listed below that have the possibility of piston to valve contact. If the engine you are working on is not listed, do not assume that it is a freewheeling design. It is suggested to add to this listing as additional information is obtained.

1986-89 1.6L Integra
1991-95 1.7L Integra
1990-95 1.8L Integra 
1986-89 2.5L Legend
1992-94 2.5L Vigor
1986-89 2.7L Legend
1990      2.7L Legend
1991-95 3.0L NSX
1991-95 3.2L Legend

1970-93 All Except 1970-77 
1.9L & 1970-73 1.8L

1987-95 2.5L 325I 525I
1994-95 4.0L 740I

1993-95 1.5L Colt 
1987-88 1.5L Colt	
1992-95 1.5L Eagle Summit
1987-88 1.6L Colt	
1989-92 1.6L Eagle Summit
1994-98 2.0L Neon Stratus
1990-95 2.0L Eagle Talon

1988-92 1.0L Charade
1988-92 1.3L Charade
1990-92 1.6L Rocky

1974-79 1.3L 128 Series
1979-82 1.5L Stranda
1974-78 1.6L 124 Series
1974-78 1.8L 124 Series
1974-78 1.8L 131 Series, Brava
1979-82 2.0L Brava, Spider 

1981-85 1.6L Escort, EXP
1981-83 1.6L LN7, Lynx
1984-85 2.0L Escort, Tempo
1993-95 2.0L Probe
1986-88 2.0L Ranger
1984-87 2.0L Lynx, Topaz Diesel
1985    2.2L Ranger
1989-92 2.2L Probe
1986-88 2.3L Ranger
1986-87 2.3L Diesel Ranger
1991-98 4.6L Crown Victoria

1986-95 1.0L Geo Metro
1989-91 1.0L Firefly (CANADA)
1985-88 1.5L Sunburst (CANADA)
1985-89 1.5L Spectrum
1990-93 1.6L Prizm, Storm
1981-84 1.8L Diesel (CANADA)
1982-86 1.8L Buick Skyhawk
1990-98 1.9L Saturn
1987-88 2.0L Buick Skyhawk
1988-95 2.3L Quad Four
1985-87 3.0L Buick
1979-95 3.8L Buick

1986-87 1.0L Prelude
1973-78 1.2L All
1973-78 1.3L All
1980-84 1.3L All
1973-78 1.5L All
1985-89 1.5L Civic
1988-95 1.5L Civic, CRX
1993-95 1.5L Civic Del Sol
1979-84 1.5L All
1985-87 1.5L CRX
1993-95 1.6L Civic Del Sol
1973-78 1.6L All
1980-82 1.6L All
1988-95 1.6L Civic, CRX
1984-87 1.8L Prelude, Accord
1979-83 1.8L All
1986-91 2.0L Prelude
1990-91 2.1L Prelude
1990-95 2.2L Prelude, Accord
1992-95 2.2L Prelude
1995      2.7L Accord

1984-95 1.5L Excel Scoupe
1995-98 1.5L Accent
1992-95 1.6L Elantra
1993-95 1.8L Elantra
1992-95 2.0L Sonata
1989-91 2.4L Sonata
1990-95 3.0L Sonata

1990-92 3.0L M30

1987-89 1.5L I-Mark
1990-93 1.6L Stylus Impulse
1987-89 2.0L Impulse
1981-87 2.2L Diesel Truck
1986-95 2.3L Truck Trooper
1988-95 2.6L Truck Rodeo Amigo
1991-96 3.2L Trooper Rodeo Amigo

1995      2.0L Sportage

1984-85 2.0L 626 
1988-92 2.2L 626 MX6
1989-93 2.2L Pickup
1988-95 3.0L 929 MPV

1985-95 1.5L Mirage Precise
1990-92 1.6L Mirage
1989-95 2.0L Galant Eclipse
1983-86 2.3L Diesel Pickup
1994-95 2.4L Galant

1982      1.5L Centra
1983-88 1.6L Sentra Pulsar
1987-89 1.8L Pulsar
1982-89 2.0L Stanza 300ZX
1984-95 3.0L Maxima 300ZX Pathfinder

1976-83 2.0L 924
1976-89 2.5L 944 Series
1989      2.7L 944 Series
1989-91 3.0L 944 Series
1976-83 4.5L 928
1984      4.7L 928
1985-91 5.0L 928
1992-95 5.4L 928

1985-94 1.3L Samurai Sidekick
1989-94 1.3L Swift

1986-95 1.5L Tercel
1981-83 2.2L Pickup
1984-87 2.4L Pickup
1982-88 2.8L Celica Cressida
1987-94 3.0L 4-Runner

1976-91 All Except 1.9 2.1L Engine
1990-92 1.6L Golf (CANADA) Jetta
1990-95 2.0L GTI Jetta GLI Passat

1991      2.3L Coupe 940
1986-94 2.3L 240 740 940 

                                                                              The AERA Technical Committee


	    Stubborn Cam Cap Bolts On
	 1990-96 Infiniti 4.5L VIN N Engines 

AERA members have expressed difficulty removing the 
camshaft cap bolts on 1990-96 Infiniti 4.5L engines. 
This difficulty raises concern when it is encountered 
while attempting to remove the first bolt, as there 
are a total of 48 bolts used. To compound this 
problem, the bolt size is small and the bolt head is 
an external TORX(R) type. 

AERA members have reported socket breakage while 
attempting removal, as these smaller tools have 
limited integrity. Apparently, these bolts have taken 
a set, as assembly torque of the bolts is a minimal 
10 ft. lbs. These bolts had sealer applied at the 
factory and, in some instances, excessive amounts may 
have been used. This sealer is actually locking the 
bolt shank above the threaded area and the head of the 

To facilitate removal of these bolts several methods 
have been used. Using an impact driver and impact 
socket has been the most effective. The impact driver 
uses a shock method to break the bolt loose. Once 
loose, removal is easily accomplished. One member has 
indicated a sharp wrap with a hammer and blunt end 
punch has worked for him. Of course, removing the bolt 
head by using a grinding or end mill is also possible 
for the most stubborn bolts.

Before installing the caps, position each camshaft so 
their locating dowel pin is at the 12 o'clock 
position. Then, install the camshaft cap mounting 
bolts and torque them to 10 ft/lbs using the sequence 
shown in the illustration below. Do not use any sealer 
on bolt threads, use a light application of oil on the 
threads and bolt head mating surface.

			The AERA Technical Committee

April 1998 - TB  1558



                                          Cylinder Head Installation On
                                       1993-96 Infiniti 3.0L VIN A Engines

The AERA Technical Committee offers the following information on cylinder head installations for 1993-96 3.0L VIN A engines. This engine uses two different length head bolts and one other small 6 mm bolt. For each head, one long bolt, seven short bolts and one 6 mm bolt are required.

Before installing the heads, place the number one cylinder at top dead center, making sure the crankshaft sprocket marks are lined up. Install the head gasket and cylinder head, then follow the procedure listed below.

      1. Ensure bolt washers are installed on head bolts with chamfer
      toward the bolt head.

      2. Coat all bolt threads and contact surfaces with light engine

      3. Install all bolts and hand tighten.

      4. In sequence, tighten long and short bolts to 29 ft. lbs.

      5. In sequence, tighten long and short bolts to 91 ft. lbs.

      6. In sequence, loosen all bolts.

      7. In sequence, tighten short bolts an additional 70-75^ turn.

      8. In sequence, tighten long bolts an additional 65-70^ turn.

      9. Tighten the 6 mm bolt to 106 in. lbs.

                                                                        The AERA Technical Committee


                           Valve Crosshead To Rocker Lever Clearance On
                              NH, NT & V-1710 Series Cummins Engines

Valve crosshead nose to rocker lever clearance on the subject engines must be checked during engine rebuild and at any time valve crossheads are replaced on engines using crossheads No. 123416 & 3000326. A minimum of .020 (.51 mm) clearance must be present as illustrated in Fig. 1, on the cylinder being checked with valves completely closed and crosshead in the upmost position. After installing rocker lever assemblies, check crosshead to rocker lever clearance as follows:

1. Turn crankshaft slowly in direction of rotation until the valves are closed on the cylinder being checked. With rocker lever held firmly against the stellite pad of the crosshead, a .020 (.51 mm) wire type feeler gauge must pass between the crosshead nose and the lower beam section of the rocker lever.

2. If the feeler gauge does not pass through:

a. Remove the rocker lever and/or crosshead and grind the nose of the crosshead or 	rocker lever beam in the area circled in Fig. 1 until enough clearance is obtained.

b. If the rocker is ground, grinding should cover the complete area illustrated in Fig. 2 in a continuous arc. Do NOT grind just the contact area.

Caution: A sharp depression in this area will cause a stress riser and eventual failure of the lever. Grind only enough material to achieve the required clearance. If grinding enters the oil passage, the rocker lever must be junked.

c. Grind sharp edges smooth.

                                                                   The AERA Technical Committee

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