Chevrolet DB90 Series, Service Manual

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S ec. 6A-60
GASOLINE ENGINES
TORQUE SPECIFICATIONS
ALL 401, 478, AND 637 GASOLINE ENGINES UNLESS OTHERWISE NOTED
(Dry Threads U n less O therw ise Indicated)
ITEM F T .-L B S .
Flyw heel to Crankshaft B o l t s ........................................................................................................ 100-110
Main B earing Cap B olts (401 & 478 Engines) 9/16" ............................................................ 130-140
Rear Main B earing Cap B o lts (401 & 478 Engines) %" ........................................................ * 90-100
Main B earing Cap V ertical Bolt (637 Engine) 5/8" ............................................................ *170-180
Main B earing Cap Side B olts and Rear Main B earing Cap B olts
%"
.............................. * 90-100
Oil Pump Mounting Bolt ................................................................................................................ 30-35
Fuel Pump E ccentric to Camshaft Bolt .................................................................................. * 55-65
Camshaft Thrust P late B o l t s ........................................................................................................ 25-30
Connecting Rod N u t ........................................................................................................................... * 55-65
Intake Manifold B o l t s ....................................................................................................................... 25-30
Exhaust Manifold B olt ................................................................................................................... 15-20
Front Cover to Cylinder B lock B olt ......................................................................................... 22-27
Dam per or P ulley Hub (with Cone) to Crankshaft B olt ........................................................ 240-260
Crankshaft Hub Bolt (without Cone) (401 Engine) ................................................................ 180-200
Flyw heel Housing to Cylinder Block Bolt (Standard T r a n s m i s s i o n ) .............................. 50-60
Flyw heel Housing to Cylinder Block Bolt (Automatic T ransm ission) .......................... 85-105
Oil F ilter Housing to Cylinder B lock B olt .............................................................................. 26-36
Oil F ilte r Center Stud B o l t ............................................................................................................ 40-50
Oil Pan to C ylinder Block B o l t ..................................................................................................... 10-15
Oil Pan Drain Plug ........................................................................................................................... 20-30
V alve L ifter Cover Bolt ................................................................................................................ 4 -5
R ocker Arm Cover Screw ............................................................................................................ 3-5
R ocker Shaft Bracket B o l t s ............................................................................................................ 20-25
Camshaft Idler Gear Shaft to Cylinder Block Bolt (637 Engine) ...................................... 25-30
Camshaft Idler Gear Shaft to Cylinder Block Bolt (401 & 478 Engines) ....................... 12-15
D istributor Clamp to Block Bolt ................................................................................................. 12-17
Idler Gear Thrust W asher B o l t ..................................................................................................... 25-30
Spark P l u g s .......................................................................................................................................... 30-34
C ylinder Head Bolt (401 & 478 Engines) .................................................................................. * 60-65
Cylinder Head Bolt (637 E n g i n e ) ................................................................................................. *130-135
B alance Shaft Counterweight (637 Engine) .............................................................................. 25-30
B alance Shaft Thrust P late to B lock Bolt (637 Engine) .................................................... 25-30
B alance Idler Gear Shaft to Block B olt (637 Engine) ............................................................ * 25-30
Camshaft Gear to Camshaft Bolt (637 E n g i n e ) ....................................................................... * 50-60
Water Outlet Manifold to Cylinder Head B olt (401 & 478 Engines) .............................. 20-25
Water Outlet Manifold (401 & 478 Engines) ........................................................................... 20-25
Fuel Pump Mounting B olts 5 / 1 6 " ................................................................................................. 12-17
Fuel Pump Mounting B olts 3/8" ................................................................................................. 20-25
Oil Pump Cover B o lts .................................................................................................................... 8-15
* Lubricate threads and bolt head with S.A .E . # 10 Engine O il.
CHEVROLET SERIES 70-90 HEAVY DUTY TRUCK SHOP MANUAL SUPPLEMENT