Toque specs on a 1971 in line 6 mercury comet's rod bearings and the clearance between the bearing and crankshaft

I need all the specs of Isuzu npr 4hg1 engine.Cylinder head bolts torque, crankshaft bolts torque, connecting rod caps bolts torque
.

See #1; Main bearing diagram
See #2; NM conversion chart

1. NOTE: The crankshaft must rotate freely; if necessary check and adjust the bearing clearances.Tighten the main bearings and connecting rod bearings.
   
   1. Tighten the main bearing bolts in two stages.
   • Stage 1: 25 Nm.
   • Stage 2: 60 degrees.
   1. Tighten the connecting rod bearing bolts in two stages.
   • Stage 1: 25 Nm.
   • Stage 2: 90 degrees.

# 2) Newton Meters conversion chart:
http://extraconversion.com/energy/newton-meters/newton-meters-to-foot-pounds.html

#1)
saailer

I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

How do you know that you have Low Oil Pressure?

Are you trusting the Gauge or putting an In-Line Gauge?

YOUR GM GAUGE CLUSTER is known to have BAD or DEFECTIVE STEPPER MOTORS...

If you put the In-line Gauge on and see that you have Good Pressure, then what you need to do is rebuild your Instrument Cluster.

MAKE SURE YOU USE X27.168 Stepper Motors... The Cheaper CHINEESE STEPPER MOTORS are black and are defective.

The X27.168 Stepper Motors are WHITE and will last for as long as you own the Truck.

Order 6 Stepper Motors and do them ALL at the same time or you can pay someone $95-$200 to rebuild it for you...

Yes, the rods must have some side clearance between them and the crankshaft. Consult your manual for this measurement. It will usually be between .001 and .003 and can be measured with a set of feeler guages.
this is not a bearing clearance, but a clearance between the rod and the crankshaft. Bearing clearance can be measured with plasti guage.

General Specifications Item Specification
Displacement L (CID) 4.6 (281)
Number of Cylinders 8
Bore and Stroke mm 90.2 x 90.0
Firing Order 1-3-7-2-6-5-4-8
Oil Pressure (HOT @ 1500 rpm) kPa 138-310
Drive Belt Tension a
Cylinder Head and Valve Train
Combustion Chamber Volume cm 52?±.5
Valve Seats Width?€"Intake mm 1.9-2.1
Valve Seats Width?€"Exhaust mm 1.9-2.1
Valve Seats Angle 44.51-45.01 degrees
Valve Seats Runout (T.I.R.) Max mm 0.025
Valve Arrangement (Front-to-Rear) (Left Hand) E-I-E-I-E-I-E-I
(Right Hand)
I-E-I-E-I-E-I-E
Valve Stem to Guide Clearance?€"Intake mm (Inch) 0.020-0.069
(0.00078-0.00272)
Valve Stem to Guide Clearance?€"Exhaust mm (Inch) 0.045-0.095 (0.0018-0.0037)
Valve Head Diameter?€"Intake mm (Inch) 44.5- (1.75)
Valve Head Diameter?€"Exhaust mm (Inch) 34.0 (1.34)
Valve Head Diameter?€"Gauge Diameters mm (Inch) 42.5- and 32.0
(1.67 and 1.26)
Valve Face Runout Limit mm (Inch) 0.05 (0.002)
Valve Face Angle 45.25-45.75 degrees
Valve Stem Diameter (STD)
?€"Intake mm (Inch) 6.995-6.975 (0.275-0.2746)
Valve Stem Diameter (Std)
?€"Exhaust mm (Inch) 6.970-6.949 (0.274-0.2736)
Valve Springs?€"
Compression Pressure N @
Spec. Length?€"Intake 587.14 N @ 28.02 mm
Valve Springs?€"
Compression Pressure N @
Spec. Length?€"Exhaust 587.14 N @
28.02 mm
Valve Springs?€"Free
Length ( Approximate)?€"
Intake mm (Inch) 49.55 (1.951)
Valve Springs?€"Free
Length (Approximate)?€"
Exhaust mm (Inch) 49.55 (1.951)
Valve Springs?€"Installed
Pressure N @ Spec. Length
?€"Intake 244.64 N @ 40.0 mm
Valve Spring?€"Installed
Pressure N @ Spec. Length
?€"Exhaust 244.64 N @ 40.0 mm
Valve Springs?€"Installed
Pressure N @ Spec. Length
?€"Service Limit 10 % Pressure Less @ 28.02 mm
Valve Springs?€"Installed
Pressure N @ Spec. Length
?€"Out of Square Limit 2 degrees
Valve Guide Inner
Diameter mm (Inch) 7.015-7.044 (0.2761-0.2773)
Rocker Arm?€"Ratio 1.75:1
Valve Tappet?€"Diameter
(STD) mm (Inch) 16.000-15.988 (0.66-0.629)
Valve Tappet?€"Clearance
to Bore mm (Inch) 0.018-0.069
(0.00071-0.00272)
Valve Tappet?€"Service
Limit mm (Inch) 0.016 (0.00063)
Valve Tappet?€"Hydraulic
Leakdown Rate b 5-25 seconds
Valve Tappet?€"Collapsed
Valve Tappet Gap?€"
Desired mm (Inch) 0.085-0.45 (0.0033-0.0177)
Camshaft
Lobe Lift?€"Intake
mm (Inch) 6.58939 (0.2594)
Lobe Lift?€"Exhaust
mm (Inch) 6.58939 (0.2594)
Lobe Lift?€"Allowable
Lobe Lift Loss mm (Inch) 0 (0)
Theoretical Valve Lift @
Zero Lash?€"Intake
mm (Inch) 12.0 (0.472)
Theoretical Valve Lift @
Zero Lash?€"Exhaust
mm (Inch) 12.0 (0.472)
End Play mm (Inch) 0.025-0.165
(0.00098-0.0065)
Journal to Bearing
Clearance mm (Inch) 0.025-0.076
(0.00098-0.003
Journal to Bearing
Clearance?€"Service Limit
mm (Inch) 0.021 (0.0048)
Journal Diameter (All)
mm (Inch) 26.962-26.936
(1.061-1.060)
Journal Diameter (All)?€"
Bearing Inside Diameter
(All) mm (Inch) 27.012-26.987
(1.063-1.0625)
Camshaft Runout
mm (Inch) 0.05 (0.002)
Cylinder Bore
Diameter?€"Surface Finish
(RMS) 0.2-0.6 Microns
Diameter?€"Out-of-Round
Limit mm (Inch) 0.015 (0.0006)
Diameter?€"Out-of-Round
Service Limit mm (Inch) 0.020 (0.00079)
Diameter?€"Taper Service
Limit mm (Inch) 0.006 (0.00023)
Piston
Piston?€"Diameter?€"
Coded Red 1 mm (Inch) 90.177-90.197
(3.550-3.551)
Piston?€"Diameter?€"
Coded Blue 2 mm (Inch) 90.190-90.210
(3.5507-3.5515)
Piston?€"Diameter?€"
Coded Yellow 3 mm (Inch) 90.203-90.223
(3.513-3.5521)
Piston-to-Bore-Clearance
mm (Inch) -0.015 + 0.031 (0.0005-0.0012)
Pin Bore Diameter
mm (Inch) 22.0015-22.004
(0.866-0.8663)
Ring Groove Width?€"
Compression (Top)
mm (Inch) 1.520-1.550 (0.06-0.610)
Ring Groove Width?€"
Compression (Bottom)
mm (Inch) 1.520-1.530 (0.060-0.0602)
Ring Groove Width?€"Oil
Ring mm (Inch) 6.996-7.224 (0.275-0.2844)
Piston Pin?€"Length
mm (Inch) 61.93-62.05 (2.44-2.443)
Diameter mm (Inch) 21.994-21.999
(0.866-0.8661)
Pin to Piston Clearance
mm (Inch) 0.005-0.010
(0.0002-0.0004)
Pin to Rod Clearance
mm (Inch) 0.015-0.040
(0.0006-0.00157)
Piston Rings?€"Ring Gap
?€"Compression (Top)
mm (Inch) 1.0 MAX (0.0394)
Piston Rings?€"Ring Gap
?€"Compression (Top)
mm (Inch) 1.0 MAX (0.0394)
Oil Ring?€"Side Clearance
mm (Inch) 1.25 MAX (0.05)
Oil Ring?€"Compression
(Top) mm (Inch) 0.040-0.090
(0.0016-0.0031)
Oil Ring?€"Compression
(Top) mm (Inch) 0.030-0.080
(0.0012-0.00031)
Oil Ring Snug Fit
Oil Ring?€"Service Limit
mm (Inch) 0.015 MAX (0.0006)
Ring Gap?€"Compression
(Top) mm (Inch) 0.23-0.49
(0.01-0.02)
Ring Gap?€"Compression
(Bottom) mm (Inch) 0.23-0.49
(0.01-0.02)
Ring Gap?€"Oil Ring (Steel
Rail) mm (Inch) 0.05-0.66 (0.006-0.026)
Lubrication System
Oil Capacity?€"Automatic
Transmission (Quarts U.S.) 6.675?±0.125
Oil Capacity?€"Manual
Transmission (Quarts U.S.) 6.425?±0.125
Cylinder Block
Main Bearing Bore
Diameter mm (Inch) 72.401-72.422 (2.85-2.851)
Crankshaft and Flywheel
Main Bearing Journal
Diameter mm (Inch) 67.483-67-503 (2.65-2.657)
Connecting Rod Journal?€"
Diameter mm (Inch) 52.988-53.003
(2.0861-2.0867)
Crankshaft Free End Play
mm (Inch) 0.130-0.301 (0.0051-0.012)
Crankshaft Runout to Rear
Face of Block mm (Inch) 0.050 MAX (0.002)
Connecting Rod Bearings
Clearance to Crankshaft?€"
Desired mm (Inch) 0.027-0.069 (0.001-0.0027)
Clearance to Crankshaft?€"
Allowable mm (Inch) 0.027-0/069 (0.001-0.0027)
Bearing Wall Thickness
(STD) mm (Inch) 2.44-2.452 (0.096-0.0965)
Main Bearings
Clearance to Crankshaft?€"
Desired mm (Inch) 0027-0.065
(0.0011-0.0026)
Clearance to Crankshaft?€"
Allowable mm (Inch) 0.027-0.065
(0.0011-0.0026)
Bearing Wall Thickness
(STD) mm (Inch) 1.920-1.928 (0.075-0.076)
Connecting Rod, Piston and Rings
Connecting Rod?€"Piston
Pin Bore Diameter
mm (Inch) 21.959-21.979
(0.864-0.865)
Connecting Rod?€"
Crankshaft Bearing Bore
Diameter mm (Inch) 56.756-56.876 (2.234-2.24)
Connecting Rod?€"Length
(Center-to-Center)
mm (Inch) 150.7 (5.93)
Alignment (Bore-to-Bore
Max. Diff.) c ?€"Twist
mm (Inch) 0.050 per 25 (0.0015-0.984)
Alignment (Bore-to-Bore
Max. Diff.)?€"Bend
mm (Inch) 0.038 per 25 (0.0015-0.984)
Side Clearance (Assembled
to Crank)?€"Standard
mm (Inch) 0.015-0.45 (0.0006-0.0177)
Side Clearance (Assembled
to Crank)?€"Service Limit
mm (Inch) 0.05 MAX (0.02)
Crankshaft Main Bearing
Journal Taper mm (Inch) 0.020 (0.0007)
Crankshaft Main Bearing
Journal Runout mm (Inch) 0.05 (0.002)
Crankshaft Connecting Rod
Journal Taper mm (Inch) 0.015 (0.0006)

Crankshaft and Main Bearings REMOVAL & INSTALLATION NOTE: When draining coolant, keep in mind that cats and dogs are attracted by the ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old. CAUTION
The EPA warns that prolonged contact with used engine oil may cause a number of skin disorders, including cancer! You should make every effort to minimize your exposure to used engine oil. Protective gloves should be worn when changing the oil. Wash your and and any other exposed skin areas as soon as possible after exposure to used engine oil. Soap and water, or waterless hand cleaner should be used. 2.3L Engine

1. Disconnect the negative battery cable.
2. Drain the cooling system and engine crankcase.
3. Remove the engine from the vehicle.
4. Remove the crankshaft front pulley, front cover, timing chain and sprockets, cylinder head, oil pan, oil pump and intermediate driveshaft.
5. Remove the rear oil seal cover bolts and remove the cover.
6. Remove the piston assemblies. NOTE: Mark the connecting rods and bearing caps so they can be installed in the proper cylinders.
   
7. Remove the main bearing caps and bearing.
8. Carefully lift the crankshaft out of the crankcase, so No. 3 thrust bearing surfaces are not damaged.
9. Remove the main bearing inserts from the engine block and bearing caps. NOTE: For cleaning purposes, the oil gallery and coolant drain plugs can be removed. To install:
   
10. Wash the cylinder block thoroughly to remove all foreign material and dry before assembling other components. Check to ensure all oil holes are fully open and clean. Check to ensure the bearing inserts and bearing bores are clean. Clean the mating surfaces of the crankcase and each main bearing cap.
11. Install the main bearings in the cylinder block. Note that the center front bearing is a thrust bearing and the front upper bearing has a small "V'' notch on the parting line face.
12. Lubricate the bearings with clean engine oil.
13. Carefully lower the crankshaft into place. Be careful not to damage the bearing surfaces.
14. Check the clearance of each main bearing as outlined in this section.
15. After the bearing has been fitted, apply a light coat of engine oil to the journal and bearings. Install the bearing cap in their original locations . (refer to numbers on caps). The caps must be installed with the arrows pointing to ward the front of the engine. Oil the bolts and tighten to specifications. Repeat the procedure for the remaining bearings. NOTE: Turn the crankshaft to check for turning torque. The turning torque should not exceed 4.5 ft. lbs. (6 Nm).
    
16. Install the pistons and connecting rod caps. Check clearance of each bearing, as out lined in this section.
17. After the connecting rod bearings have been fitted, apply a light coat of engine oil to the journal and bearings.
18. Turn the crankshaft throw to the bottom of its stroke. Pull the piston all the way down until the rod bearing seats on the crankshaft journal. NOTE: Guide the rod to prevent crankshaft journal and oil cooling jet damage.
    
19. Install the connecting rod cap. Align the marks on the rods with the marks on the cap, and tighten the nut.
20. After the piston and connecting rod assemblies have been installed, check the side clearance between the connecting rods on each connecting rod crankshaft journal.
21. Install the rear crankshaft seal and cover. Tighten the bolts to 5–7 ft. lbs. (7–10 Nm).
22. Installation of the remaining components is in the reverse order of removal.

1. Check the connecting rod alignment If either the bend or the twist exceeds the specified limit,the connecting rod must be replaced. Bend per 100 mm (3.937 inch) Limit: 0.15 (0.0059) Twist per 100 mm (3.937 inch) Limit: 0.20 (0.0078)

2. Measure the connecting rod thrust clearance. Use a feeler gauge to measure the thrust clearance at the large end of the connecting rod If the clearance exceeds the specified limit, the connecting rod must be replaced. Standard: 0.16 mm - 0.35 mm (0.0063 inch - 0.0138 inch) Limit: 0.40 mm (0.0157 inch)

3. Measure the oil clearance between the connecting rod and the crankshaft.

1. Remove the connecting rod cap nuts and the rod caps (12). Arrange the removed rod caps in the cylinder number order.
2. Clean the rod bearings and the crankshaft pins.
1. Carefully check the rod bearings. If even one bearing is found to be damaged or badly worn, the entire bearing assembly must be replaced as a set. Reinstall the bearings in their original positions. Apply plastigage to the crank pin.
2. Reinstall the rod caps (12) to their original positions. Tighten the rod cap nuts. Torque: 54 Nm (40 ft. lbs.) Note: Do not allow the crankshaft to rotate.
3. Remove the rod caps.
1. Measure the width of the plastigage and determine the oil clearance. If the oil clearance exceeds the limit, replace the rod bearing as a set. Standard: 0.019 mm - 0.043 mm (0.0007 inch - 0.0017 inch) Limit: 0.08 mm (0.003 inch)
2. Clean the plastigage from the bearings and the crankshaft pins.

2002 2.0L Duratech.

Don't have 2004 2.3L

• NOTE: Use new connecting rod bearing cap bolts.
  NOTE: Do not fully tighten the connecting rod bearing cap bolts at this stage.
  Install the bearing caps.

• Rotate the crankshaft through 180 degrees and insert pistons 2 and 3.

• Position the corresponding bearing shells, clean and free of oil, into the connecting rod and the connecting rod bearing cap.

• Coat the inner side of the bearing shells with engine oil.

1. NOTE: The crankshaft must rotate freely, if necessary check and adjust the bearing clearances.
   Tighten the main bearing and connecting rod bearing bolts.
   1. Tighten the main bearing bolts in two stages.
      • Stage 1: 25 Nm.
      • Stage 2: 60 degrees.
   1. Tighten the connecting rod bearing bolts in two stages.
      • Stage 1: 35 Nm.
      • Stage 2: 90 degrees.

If your going to do do that much work , I would invest in a Chilton's or Haynes manual