Engine Bolt Torque Information On
                             GM (Chevrolet) 1977 L-4, L-6 & V-8 Engines

Chevette L-4 Engine Torque Bolt Specifications

Usage Torques
---------------------------------------------------------------------------

Camshaft Carrier Bolts 90-95Nm 65-77 ft.lbs.
Camshaft Cover Nuts 1.4-1.8Nm 12-16 in.lbs.
Camshaft Sprocket Bolt 90-115Nm 65-85 ft.lbs.
Crankshaft Pulley Bolt 90-115Nm 65-85 ft.lbs.
Crankcase Front Cover Bolt 6-8Nm 55-75 in.lbs.
Front Cover Nut 5-8Nm 50-75 in.lbs.
Connecting Rod Nuts 46-54Nm 34-40 ft.lbs.
Coil Attaching Bolt 18-24Nm 13-18 ft.lbs.
Distributor Clamp Bolt 15-19Nm 11-14 ft.lbs.
Exhaust Manifold 26-34Nm 19-25ft.lbs.
Flywheel Bolt 54-75Nm 40-52 ft.lbs.
Fuel Pump Bolts 19-23Nm 14-17 ft.lbs.
Generator Bracket Bolt 30-40Nm 22-30 ft.lbs.
Idler Pulley Bolt 18-24Nm 13-18 ft.lbs.
Intake Manifold Bolt 18-24Nm 13-18 ft.lbs.
Main Bearing Caps 54-75Nm 40-52 ft.lbs.
Oil Drain Plug 20-27Nm 15-20 ft.lbs.
Oil Pan Bolts 5-7Nm 45-60 in.lbs.
Oil Suction Tube & Screen Ass. 26-34Nm 19-25 ft.lbs.
Oil Suction Tube Clamp 95-130Nm 70-95 in.lbs.
Oil Filter 16-23Nm 12-17 ft.lbs.
Oil Pump Cover Screws 8-11Nm 71-97 in.lbs.
Oil Pump Bolts 5-7Nm 45-60 in.lbs.
Water Pump Bolts 18-24Nm 13-18 ft.lbs.
Spark Plugs 27Nm 20 ft.lbs.


Vega - Monza L-4 Engine Bolt Torque Specifications

Size Usage Torque
----------------------------------------------------------

1/4-14 Engine Front Cover 50 in.lbs.
1/4-20 Cam Cover 80 in.lbs.
1/4-20 Oil Screen To Screen 50 in.lbs.
1/4-20 Clutch Housing Underpan 95 in.lbs.
1/4-20 Oil Screen Support To Baffle 50 in.lbs.
1/4-20 Oil Drain Back Tube To Baffle 50 in.lbs.
5/16-18 Fan Blade To Pump 20 ft.lbs.
5/16-18 Clutch Pressure Plate To Fly. 20 ft.lbs.
5/16-18 Crankshaft Damp/Pulley Sprkt. 15 ft.lbs.
5/16-18 Oil Pump To Case (Bolt) 15 ft.lbs.
5/16-18 Water Pump To Case 15 ft.lbs.
5/16-18 Oil Pan To Case 15 ft.lbs.
5/16-18 Cam Retainer 18 ft.lbs.
5/16-24 Ex. Gas Recirc. Valve To Man. 20 ft.lbs.
11/32-24 Connecting Rod Cap 35 ft.lbs.
3/8-16 Oil Pump To Case (Stud) 30 ft.lbs.
3/8-16 Distributor Clamp Nut 25 ft.lbs.
3/8-16 Water Outlet To Head 30 ft.lbs.
3/8-16 Manifold (Bolts) 30 ft.lbs.
3/8-16 Clutch Housing To Case 25 ft.lbs.
3/8-16 Clutch Pressure Plate To Fly. 30 ft.lbs.
3/8-18 Inlet Manifold To Head (Stud) 30 ft.lbs.
7/16-14 Engine Mount Stud To Block 20 ft.lbs.
7/16-14 Main Bearing Caps 65 ft.lbs.
7/16-14 Cylinder Head 60 ft.lbs.
7/16-20 Flywheel To Crank 65 ft.lbs.
1/2-13 Cam Sprocket To Cam 80 ft.lbs.
1/2-13 Damper/Pulley To Crank 80 ft.lbs.
1/2-20 Oil Pan Drain Plug 20 ft.lbs.
1.00-12 Oil Filter Connector To Case 30 ft.lbs.
1.00-12 Oil Filter Hand Tight
14mm Spark Plug 20 ft.lbs.


In-Line 4.1L (250 CID) Car - Truck Engine Bolt Torques

Size Usage Torque
----------------------------------------------------------------

1/4-20 Cam Thrust Plate 80 in.lbs.
1/4-20 Crankcase Front Cover 80 in.lbs.
1/4-20 Flywheel Housing Cover 80 in.lbs.
1/4-20 Oil Filter Bypass Valve 80 in.lbs.
1/4-20 Oil Pan To Crankcase 80 in.lbs.
1/4-20 Oil Pan To Front Cover 50 in.lbs.
1/4-20 Oil Pump Cover All 80 in.lbs.
1/4-20 Rocker Arm Cover 45 in.lbs.
11/32-24 Connecting Rod Cap 35 ft.lbs.
5/16-18 Camshaft Sprocket 20 ft.lbs.
5/16-18 Oil Pan To Crankcase 80 in.lbs.
5/16-18 Oil Pump 115 in.lbs.
5/16-18 Push Rod Cover 80 in.lbs.
5/16-18 Water Pump 15 in.lbs.
5/16-18 Rocker Cover 45 in.lbs.
3/8-16 Clutch Pressure Plate (All) 30 ft.lbs.
3/8-16 Distributor Clamp 25 ft.lbs.
3/8-16 Flywheel Housing 30 ft.lbs.
3/8-16 Manifold (Exhaust) 35 ft.lbs.
3/8-16 Manifold (Ex. To Int.)
3/8-16 Manifold (Intake) 30 ft.lbs.
3/8-16 Manifold To Head
3/8-16 Thermostat Housing 30 ft.lbs.
3/8-16 Water Outlet 30 ft.lbs.
3/8-16 Water Pump
3/8-24 Connecting Rod Cap
7/16-14 Cylinder Head 60 ft.lbs.
7/16-14 Main Bearing Cap 65 ft.lbs.
7/16-14 Oil Pump 65 ft.lbs.
7/16-14 Rocker Arm Stud 50 ft.lbs.
7/16-20 Flywheel (All) 45 ft.lbs.
7/16-20 Torsional Damper 60 ft.lbs.
1/2-13 Cylinder Head 95 ft.lbs.
1/2-13 Main Bearing Cap 110 ft.lbs.
1/2-14 Temperature Sending Unit 20 ft.lbs.
1/2-20 Torsional Damper
1/2-20 Oil Filter Hand Tight
1/2-20 Oil Pan Drain Plug 20 ft.lbs.
1/2-20 Flywheel
14mm 5/8 Spark Plug 15 ft.lbs.


In-Line 4.8L (292 CID) Passenger Car - Truck Engine Bolt Torque

Size Usage Torque
----------------------------------------------------------------

1/4-20 Cam Thrust Plate 80 in.lbs.
1/4-20 Crankcase Front Cover 80 in.lbs.
1/4-20 Flywheel Housing Cover 80 in.lbs.
1/4-20 Oil Filter Bypass Valve
1/4-20 Oil Pan To Crankcase 80 in.lbs.
1/4-20 Oil Pan To Front Cover 50 in.lbs.
1/4-20 Oil Pump Cover All 80 in.lbs.
1/4-20 Rocker Arm Cover 45 in.lbs.
11/32-24 Connecting Rod Cap
5/16-18 Camshaft Sprocket 20 ft.lbs.
5/16-18 Oil Pan To Crankcase 80 in.lbs.
5/16-18 Oil Pump 115 in.lbs.
5/16-18 Push Rod Cover 80 in.lbs.
5/16-18 Water Pump 15 in.lbs.
5/16-18 Rocker Cover 45 in.lbs.
3/8-16 Clutch Pressure Plate (All) 30 ft.lbs.
3/8-16 Distributor Clamp 25 ft.lbs.
3/8-16 Flywheel Housing 30 ft.lbs.
3/8-16 Manifold (Exhaust)
3/8-16 Manifold (Ex. To Int.) 40 ft.lbs.
3/8-16 Manifold (Intake) 30 ft.lbs.
3/8-16 Manifold To Head 40 ft.lbs.
3/8-16 Thermostat Housing 30 ft.lbs.
3/8-16 Water Outlet 30 ft.lbs.
3/8-16 Water Pump 25-30 ft.lbs.
3/8-24 Connecting Rod Cap
7/16-14 Cylinder Head
7/16-14 Main Bearing Cap 65 ft.lbs.
7/16-14 Oil Pump
7/16-14 Rocker Arm Stud
7/16-20 Flywheel (All) 45 ft.lbs.
7/16-20 Torsional Damper 60 ft.lbs.
1/2-13 Cylinder Head 95 ft.lbs.
1/2-13 Main Bearing Cap
1/2-14 Temperature Sending Unit 20 ft.lbs.
1/2-20 Torsional Damper
1/2-20 Oil Filter Hand Tight
1/2-20 Oil Pan Drain Plug 20 ft.lbs.
1/2-20 Flywheel 110 ft.lbs.
14mm 5/8 Spark Plug 15 ft.lbs.


Small V-8 5.0, 5.7 & 6.6L Passenger Car - Truck Engine Bolt Torques

Size Usage Torque
----------------------------------------------------------------

1/4-20 Cam Thrust Plate
1/4-20 Crankcase Front Cover 80 in.lbs.
1/4-20 Flywheel Housing Cover 80 in.lbs.
1/4-20 Oil Filter Bypass Valve 80 in.lbs.
1/4-20 Oil Pan To Crankcase 80 in.lbs.
1/4-20 Oil Pan To Front Cover
1/4-20 Oil Pump Cover All 80 in.lbs.
1/4-20 Rocker Arm Cover 45 in.lbs.
11/32-24 Connecting Rod Cap
5/16-18 Camshaft Sprocket 20 ft.lbs.
5/16-18 Oil Pan To Crankcase 165 in.lbs.
5/16-18 Oil Pump
5/16-18 Push Rod Cover
5/16-18 Water Pump
5/16-18 Rocker Cover
3/8-16 Clutch Pressure Plate (All) 30 ft.lbs.
3/8-16 Distributor Clamp 25 ft.lbs.
3/8-16 Flywheel Housing 30 ft.lbs.
3/8-16 Manifold (Exhaust) 20 ft.lbs.
3/8-16 Manifold (Ex. To Int.)
3/8-16 Manifold (Intake) 30 ft.lbs.
3/8-16 Manifold To Head
3/8-16 Thermostat Housing
3/8-16 Water Outlet 30 ft.lbs.
3/8-16 Water Pump 25-30 ft.lbs.
3/8-24 Connecting Rod Cap 45 ft.lbs.
7/16-14 Cylinder Head 65 ft.lbs.
7/16-14 Main Bearing Cap 60 ft.lbs.
7/16-14 Oil Pump 65 ft.lbs.
7/16-14 Rocker Arm Stud
7/16-20 Flywheel (All) 65 ft.lbs.
7/16-20 Torsional Damper 60 ft.lbs.
1/2-13 Cylinder Head
1/2-13 Main Bearing Cap
1/2-14 Temperature Sending Unit 20 ft.lbs.
1/2-20 Torsional Damper
1/2-20 Oil Filter 25 ft.lbs.
1/2-20 Oil Pan Drain Plug 20 ft.lbs.
1/2-20 Flywheel
14mm 5/8 Spark Plug 15 ft.lbs.


Mark IV V-8 Engine Bolt Torques

Size Usage Torque
----------------------------------------------------------------

1/4-20 Cam Thrust Plate
1/4-20 Crankcase Front Cover 80 in.lbs.
1/4-20 Flywheel Housing Cover 80 in.lbs.
1/4-20 Oil Filter Bypass Valve 80 in.lbs.
1/4-20 Oil Pan To Crankcase
1/4-20 Oil Pan To Front Cover 55 in.lbs.
1/4-20 Oil Pump Cover All 80 in.lbs.
1/4-20 Rocker Arm Cover 50 in.lbs.
11/32-24 Connecting Rod Cap
5/16-18 Camshaft Sprocket 20 ft.lbs.
5/16-18 Oil Pan To Crankcase 135 in.lbs.
5/16-18 Oil Pump
5/16-18 Push Rod Cover
5/16-18 Water Pump
5/16-18 Rocker Cover
3/8-16 Clutch Pressure Plate (All) 30 ft.lbs.
3/8-16 Distributor Clamp 25 ft.lbs.
3/8-16 Flywheel Housing 30 ft.lbs.
3/8-16 Manifold (Exhaust) 20 ft.lbs.
3/8-16 Manifold (Ex. To Int.)
3/8-16 Manifold (Intake) 30 ft.lbs.
3/8-16 Manifold To Head
3/8-16 Thermostat Housing
3/8-16 Water Outlet 30 ft.lbs.
3/8-16 Water Pump 25-30 ft.lbs.
3/8-24 Connecting Rod Cap 50 ft.lbs.
7/16-14 Cylinder Head 80 ft.lbs.
7/16-14 Main Bearing Cap
7/16-14 Oil Pump 65 ft.lbs.
7/16-14 Rocker Arm Stud 50 ft.lbs.
7/16-20 Flywheel (All) 65 ft.lbs.
7/16-20 Torsional Damper
1/2-13 Cylinder Head
1/2-13 Main Bearing Cap 110 ft.lbs.
1/2-14 Temperature Sending Unit 20 ft.lbs.
1/2-20 Torsional Damper 85 ft.lbs.
1/2-20 Oil Filter 25 ft.lbs.
1/2-20 Oil Pan Drain Plug 20 ft.lbs.
1/2-20 Flywheel
14mm 5/8 Spark Plug 15 ft.lbs.

                                                                       The AERA Technical Committee

                                                Camshaft Timing On All
                                             Chevrolet Chevette Engines

To check the camshaft timing, the following steps should be followed:

     1. Remove the timing belt front cover.

     2. Rotate the crankshaft so that the timing mark on the  pulley is at 0° with the #1 cylinder at T.D.C., firing.

     3. Place a 1/8 drill rod, or equivalent, through the cam sprocket quick check hole (A in Fig. 1) and the hole in the timing belt upper cover.

     If the holes do not line up, loosen the timing belt and rotate the camshaft until it is properly aligned.

                                                                        The AERA Technical Committee

       Data On The Chevrolet Chevette 1.6L (98 CID) Engine


TIMING BELTS

Chevrolet Chevette engines use three different timing belts:

1.  Narrow 99 tooth
2.  Wide 99 tooth
3.  Wide 100 tooth

One solution is to build short blocks without crank gears which
would avoid the problem.  On complete engines it has been found
the 99 tooth wide belt on the 1976 through 1978 models and the
100 tooth wide belt on the 1979 and up models works best because
the late block is about 1/4 higher.

CYLINDER BLOCKS

There are two cylinder blocks:

1.  1976 through 1978
2.  1979 and up (This is the high deck block with the 1/4
difference)

CAUTION:  These blocks should not be interchanged.

CRANKSHAFTS

There are two crankshafts:

1.  Forging No. 7184 or 7184N for 1976-79, the early crankshaft
which has smaller counterweights & the large hole (1.089) for
the converter.

2.  Forging No. 1140 or 1140N, for 1980 and up, can have either
the 1.089 hole or the small hole (.825) for the converter.

CAUTION:  Do not interchange crankshafts.  If a late crankshaft
is used in an early engine, the larger counterweights will hit
the pistons.


                                     The AERA Technical Committee


April 1984 - TB 314

##END##

                                      New Cylinder Liner O-Ring Seals On
                                      Cummins NH/NT 6 Cylinder Engines

Cummins Engine Company has released new O-ring seals for the cylinder liners in NH/NT 6 cylinder engines.  The new seals are made of an EP material and have a smaller diameter cross-section.

The new seal replaces both the old center seal #3008998 and the old lower seal #183049.  The new seal carries Cummins part #3032874 and is black in color with one blue dot.

The new O-ring seals are not to be intermixed with the former seals on the same liner.  Cylinder liner deformation will result.  You can use the former seals and new seals in the same engine as long as they are used in the correct combinations on each liner.  The illustration below shows the correct combinations.

                                                                       The AERA Technical Committee

                                               Oil in Cooling System on
                                         VW 1.5L & 1.6L Diesel Engines

AERA members have reported instances of engine oil in the cooling system on VW 1.5L diesel engines.  According to AERA sources, the problem is related to a crack in the cylinder head bolt hole located near the oil gallery feeding the cylinder head.

The oil feed gallery in the block is located on one side of the center head bolt hole and a coolant jacket is on the opposite side of the bolt hole.  Pressurized engine oil is diverted through a slot in the head gasket and is feed up the side of the head bolt to the cylinder head.  The oil also follows the bolt back down to the bottom of the bolt hole.  Should the crack in the head bolt hole extend to the coolant jacket, oil can mix with engine coolant.

This problem is generally found on engines equipped with 11mm head bolt holes.  Later design engines utilize 12mm head bolts and do not exhibit this defect.  At the time of this writing no successful repair procedure is available.

                                                                       The AERA Technical Committee

                                        Cylinder Head Specifications on
                                              Case 207 Diesel Engines

The following cylinder head specifications should be considered when remanufacturing Case Model 207 diesel engine cylinder heads.

The minimum cylinder head thickness has been established at 3.968 with a new head measuring 4.000 +/- .005.  Heads are measured from the deck surface to the rocker cover rail.

Valve recession should be checked and adjusted if necessary to a maximum recession of .015, below the deck surface, for both intake and exhaust valves.  Valves on new cylinder heads are generally flush with a +/- .005 tolerance.

                                                                       The AERA Technical Committee