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Land Rover  Engine Information

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The following technical bulletins were published by AERA.


                                              Cam Chucking Noise On
                                1989-95 Land Rover 3.9L VIN 2 Engines

AERA members have reported cam chucking noises on 1989-95 3.9L VIN 2 engines. This noise can be heard on both hot and cold temperature engines and is best observed at a front corner of the engine. The noise is most audible between idle and 2,000 rpm, while engine temperatures are hot. This noise also 
increases in frequency as engine speed increases. 

The cause of this noise has been determined to before and aft movement of the camshaft. The original design of this engine relies on cam lobe taper to 
control slight cam rearward pressure. Engines manufactured mid year during 1995 incorporated a cam button to control camshaft end play movement.

AERA members have reported installing the cam button, Part #CAM1000, and adjusting cam end play to reduce the likelihood of cam chucking noises. To install the button, follow the procedures listed below.

1. Remove old camshaft sprocket bolt and washer and  discard.
2. Obtain the revised bolt/button, Part#CAM1000, and new conical washer and carefully install into camshaft. Take care not to damage the nylon thrust  control button portion of bolt.
3. Use a deep well socket and torque to 41-44 ft./lbs.
4. Determine the clearance between button and cover by bolting on cover with a new mounting gasket attached. Using a plastic gauge strip will assist here.       5. The desired clearance specification is .005-.010 (.13-.25mm) for camshaft end play. Adjust end play by carefully flat filing the nylon button with a fine toothed flat file. The button/bolt should be mounted in a vise while performing this procedure.
6. Install gasket and front cover mounting bolts and torque bolts to 16 ft/lbs. 

                                                                        The AERA Technical Committee


                                      Improved Intake Manifold Gasket On
                                        1997-98 Land Rover 4.0L Engines

The AERA Technical Committee offers the following information on an improved intake manifold gasket on 1997-98 Land Rover 4.0L engines. Owners have 
expressed reports of intake manifold leaks as coolant and oil leaks have been noticed. 

To resolve this condition, Land Rover offers a revised intake manifold gasket and suggests the use of flat washers with the mounting bolts. Using the new design gasket and flat washers improves the clamping load on the intake manifold to cylinder head joint. As a result of the design change, the sealing 
integrity of the mating area is greatly improved. 

The design change in the gasket can be easily identified  in the shape of the gasket around the inlet cooling port opening as shown in Figure 1. The new gasket can be obtained with Part #ERR7306. The washers may be obtained with Part #WA110061L. AERA is unaware of a source other than Land Rover for the 
revised parts.

To install the gaskets and washers correctly, Land Rover offers the following information and torque sequence. 

1. Tighten the small clamp bolts at the front and rear to 4-7 ft/lbs. 
2. With the washers installed under the head of all bolts, tighten the 12 intake manifold/cylinder head bolts to 21 ft/lbs in the sequence shown in 
Figure 2.
3. Allow the gasket to bed in for at least 5 minutes.
4. In the sequence shown in Figure 2, tighten the intake manifold/cylinder head bolts to 35-40 ft/lbs.  
5. Tighten the small clamp bolts at the front and rear to 10-15 ft/lbs.

                                                                          The AERA Technical Committee


                 Cylinder Head Specifications on
        Perkins Prima, Prima Marine & 500 Series Engines

AERA members should consider the following specifications when
remanufacturing Perkins Prima, Prima Marine & 500 Series
industrial cylinder heads.  These direct injection, high speed 4
cylinder diesel engines have also been distributed by Detroit
Diesel Corporation in various industrial and marine applications
since 1986 as well as British Leyland, Land Rover trucks.

The cylinder head minimum thickness should be no less than 4.718
(119.85mm).  According to Detroit it is possible to machine .008
(.20mm) from a new cylinder head casting before approaching
minimum thickness.

The valve recession should be maintained at .035 - .049 (.89 -
1.24mm) for both intake and exhaust valves.

                                     The AERA Technical Committee

June 1990 - TB 666



                           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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