2007 Isuzu Ascender 4WD

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2007 Ascender 4WD.

Quick specs

Fluid capacities, tune-up values and fuel economy at a glance.

Lug nut torque100 ft-lbsOEM · verified

Fitment & sizes

Replacement part sizes and factory part numbers — battery, bulbs, filters and belts.

From the factory this vehicle uses a BCI 78 · 600 CCA battery, OE oil filter 8890173420. Each part links to every other vehicle that shares it, so a part you already stock may fit more of your fleet than you'd expect.

Battery groupBCI 78 · 600 CCAOEM · verified

OE service part numbers OEM · verified

Engine oil filter	8890173420
Engine air filter	8192397130
Spark plug	8126816630
Front wiper blades	8152143460
Serpentine belt	8125937740
Thermostat	8125611550 alt 8126201120

Service quick specs OEM factory data

Capacities, torques and tune-up values from the factory service manual.

This engine SYNTHETIC · 75W-90 · GL-5 in the differential. Torque lug nuts to 100 ft-lbs, the oil drain plug to 19.0 ft-lbs. The firing order is 1-3-4-2.

Lubricants & capacities

Automatic Transmission Fluid	ATF
Automatic Transmission Fluid Capacity	5
Differential Gear Oil	SYNTHETIC · 75W-90 · GL-5
Differential Gear Oil Capacity	3.6 Pints,
Power Steering Fluid	GM PART NO. 89021184 OR EQUIVALENT
Transfer Case Fluid	GM PART NO. 12378508
Transfer Case Fluid Capacity	3.8 Pints

Engine torques

Camshaft Bearing/Carrier Cap Bolts or Studs	9 ft-lbs
Cylinder Head Steps	Install new cylinder head bolts.
Intake Manifold to Engine Bolts	7.4 ft-lbs
Exhaust Manifold to Cylinder Head Bolts	15 ft-lbs
Engine Oil Pan Drain Plug	19.0 ft-lbs
Oil Pump to Cylinder BLock Bolts/Studs	7 ft-lbs

Chassis torques

Lug Nuts	100 ft-lbs
Transfer Case Fill Plug	20.0 ft-lbs
Transfer Case Drain Plug	20.0 ft-lbs
Front Wheel Hub	103 ft-lbs

Ignition

Cylinder Firing Order

1-3-4-2

Battery & A/C

Refrigerant	R134a
Oil Group	PAG
Oil Type	46
Oil Capacity	First design compressor, 8.00; second design compressor, 6.00 oz
Standard BCI Group Number	78
Standard BCI Cranking Performance	600 cca

Service checks

Pressure Test	15 psi
Radiator Cap Pressure Relief	15 psi
Thermostat Opening Temperature	188-206 °F
Key ON Engine OFF (KOEO)	50-57
Engine Compression	215 Nominal psi
Engine Oil Pressure	6
Intake Valve Lash	Hydraulic in
Exhaust Valve Lash	Hydraulic in

Brakes

Torque Caliper to Bracket	31 ft-lbs / 23 ft-lbs
Torque to Knuckle	118 ft-lbs / 148 ft-lbs
Minimum Pad Thickness	0.039 in
Minimum Shoe Thickness	0.039 in
Rotor Max Parallel Variation	0.001 in
Rotor Runout Limit	0.002 in
Rotor Nominal Thickness From	1.141 in / 0.787 in
Rotor Nominal Thickness To	1.141 in / 0.787 in

Multi-step torque procedures OEM · verified

Connecting Rod (Large End) Bearings — tightening sequence 1 stages

1

18 ft. lbs., Step 2: 110

18 ft. lbs

Engine Flywheel Bolts — tightening sequence 1 stages

1

18 ft. lbs., Step 2: 50

18 ft. lbs

Main Bearings — tightening sequence 1 stages

1

18 ft. lbs., Step 2: 180

18 ft. lbs

Factory maintenance schedule OEM · verified

Normal service, condensed from the factory interval matrix.

Under the factory schedule, replace the spark plugs every 100,000 mi; coolant at 150,000 mi. The big-interval services (at 150,000 mi for coolant, and the transmission fluid) are the ones owners most often skip — on a lower-mileage example, assume the original fluids are still in it and check them first.

Every 25,000 mi	Exhaust System (Complete) (inspect) · Fuel System (inspect)
Every 50,000 mi	Transfer Case Assembly (drain & refill)
Every 100,000 mi	Engine Air Filter Element (replace) · Spark Plugs (replace) · Transmission Fluid & Filter (replace)
At 150,000 mi	Accessory Drive Belt (inspect) · Engine Coolant System (drain, flush & refill)