2003 Isuzu NPR Engine Parts

This table covers the Camshaft plugs. Typical signs include a leak at the drain or glow-plug hole, or a plug that has rounded off. Replace the crush washer and torque to the spec in the notes. Read more

This group shows a single part: DORMAN 555080.

This table covers the bearings in the connecting-rod big ends. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly. Read more

11 Connecting Rod Bearing parts for the 2003 Isuzu NPR come from KING ENGINE BEARINGS. The "Popular" part is KING ENGINE BEARINGS CR807XPN.

The High Performance section lists 6 options from KING ENGINE BEARINGS — engineered beyond original-equipment specification. KING ENGINE BEARINGS CR807XPN is listed in this group.

In the Standard Replacement grade, KING ENGINE BEARINGS supplies 3 parts: built to original-equipment specification. A representative part number is KING ENGINE BEARINGS CR807SI.

2 further parts sit outside the graded sections, with the same engine-level match.

This table covers the Connecting Rod nuts. Read more

One part is listed for the 2003 Isuzu NPR — DORMAN 635002.

This table covers the main bearings that support the crankshaft in the block. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly. Read more

KING ENGINE BEARINGS supplies the 7 Crankshaft Main Bearing parts for the 2003 Isuzu NPR. KING ENGINE BEARINGS MB557XP carries the "Popular" badge.

High Performance: 6 parts, from KING ENGINE BEARINGS. A representative part number is KING ENGINE BEARINGS MB557XP.

The Standard Replacement section: 1 option from KING ENGINE BEARINGS. KING ENGINE BEARINGS MB557SI is listed in this group.

Listed part numbers: KING ENGINE BEARINGS MB557XP, KING ENGINE BEARINGS MB557HP and KING ENGINE BEARINGS MB557HPX, plus the other parts above.

This table covers the cylinder heads that close the top of the block. Read more

One part is listed for the 2003 Isuzu NPR — CYLINDER HEAD EXPRESS CI506B.

This table covers the Cylinder Head Spacer shims. Read more

This group shows a single part: SBI 2302152.

This table covers full gasket kits covering the joints opened in an engine rebuild. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration. Read more

2 Engine Kit Gasket Set parts for the 2003 Isuzu NPR come from ENGINE PRO.

Part numbers include ENGINE PRO 311003 and ENGINE PRO 311003MLS.

This table covers the exhaust valves that let combustion gas out of the cylinder. Typical signs include a circuit that will not hold, a whistle, or a code for this valve. A stuck valve is often debris. Clean the ports before installing the new one. Read more

SBI supplies the 3 Exhaust Valve parts for the 2003 Isuzu NPR.

This group includes SBI 02238, SBI 01807 and SBI 01807S.

This table covers the Expansion plugs. Typical signs include a leak at the drain or glow-plug hole, or a plug that has rounded off. Replace the crush washer and torque to the spec in the notes. Read more

2 Expansion Plug parts for the 2003 Isuzu NPR come from DORMAN. 1 part fits every engine; the other 1 is engine-specific.

Listed part numbers: DORMAN 555030 and DORMAN 555087.

This table covers the crankshaft pulleys / harmonic balancers at the front of the engine. Read more

5 Harmonic Balancer parts for the 2003 Isuzu NPR come from 4 brands — DORMAN, ATP, PIONEER and 1 other brand. The "Popular" part is DORMAN 594530.

Listed part numbers: DORMAN 594530, ATP 102042 and DORMAN 594121, plus the other parts above.

This table covers the gaskets between the intake manifold and the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

2 Intake Manifold Gasket parts for the 2003 Isuzu NPR come from 2 brands — DORMAN and SKP.

Listed part numbers: DORMAN 615305 and SKP SKT98109.

This table covers the intake valves that let air (and fuel, on port-injected engines) into the cylinder. Typical signs include a circuit that will not hold, a whistle, or a code for this valve. A stuck valve is often debris. Clean the ports before installing the new one. Read more

SBI supplies the 3 Intake Valve parts for the 2003 Isuzu NPR.

Part numbers include SBI 02237, SBI 02239 and SBI 01931.

This table covers the engine oils listed by grade and specification for this engine. Typical signs include a low-oil lamp, knocking after a long interval, or oil that has gone thin and black well before the next service. Match the viscosity and spec in the notes (and on the filler cap). The tables group grades — they are not interchangeable. Read more

VALVOLINE supplies the 6 Oil parts for the 2003 Isuzu NPR. VALVOLINE 773780 carries the "Popular" badge.

In the Conventional grade, VALVOLINE supplies 1 part: grouped under the catalog's "Conventional" designation — the notes column spells out what sets them apart. A representative part number is VALVOLINE 773780.

In the Full Synthetic grade, VALVOLINE supplies 1 part: full-synthetic oils. A representative part number is VALVOLINE 909772.

In the Heavy Duty / Diesel grade, VALVOLINE supplies 1 part: grouped under the catalog's "Heavy Duty / Diesel" designation — the notes column spells out what sets them apart. A representative part number is VALVOLINE 909778.

In the Synthetic Blend grade, VALVOLINE supplies 3 parts: synthetic-blend oils. A representative part number is VALVOLINE 909766.

Part numbers include VALVOLINE 773780, VALVOLINE 909772 and VALVOLINE 909778, among others listed above.

This table covers the harness connectors at the Oil Cooler Line. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock. Read more

This group shows a single part: DORMAN 800701.

This table covers the Oil Dipstick tubes. Read more

One part is listed for the 2003 Isuzu NPR — DORMAN 917411.

This table covers the drain plugs in the oil pan. Read more

9 Oil Drain Plug parts are listed for the 2003 Isuzu NPR, from DORMAN, AGS and SKP. DORMAN 090053 carries the "Popular" badge.

This group includes DORMAN 090053, AGS ODP00007 and AGS ODP00009 and the remaining parts above.

This table covers the crush washers and gaskets under the oil drain plug. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

4 Oil Drain Plug Gasket parts for the 2003 Isuzu NPR come from 2 brands — DORMAN and ULTRA-POWER.

Listed part numbers: DORMAN 097135, DORMAN 097119 and DORMAN 97119, plus the other parts above.

This table covers the caps on the oil filler neck. Read more

2 Oil Filler Cap parts are listed for the 2003 Isuzu NPR, from MOTORAD and SKP.

Part numbers include MOTORAD MO99 and SKP SKMO99.

This table covers the oil filters that screw onto this engine's filter mount. Typical signs include low oil pressure after a service, or a filter that will not spin off because the old gasket stayed on the block. Lube the new gasket and tighten to the spec on the box; a double-gasket install dumps the sump on the first drive. Read more

9 Oil Filter parts are listed for the 2003 Isuzu NPR, from VARIOUS MFR, WIX, HASTINGS / BALDWIN and 3 other brands. WIX 57521 carries the "Popular" badge.

In the Economy grade, VARIOUS MFR, CHAMP / LUBER-FINER and ULTRA-POWER supply 4 parts: the catalog's value-priced group. A representative part number is CHAMP / LUBER-FINER LFP5964.

The Standard Replacement section: 5 options from WIX, HASTINGS / BALDWIN and FRAM. WIX 57521 is listed in this group.

This group includes WIX 57521, CHAMP / LUBER-FINER LFP5964 and ULTRA-POWER 51060 and the remaining parts above.

This table covers the Oil Filter Adapter Gasket O-rings. Typical signs include a seep at a fitting or a housing that weeps after a service. Lube the new O-ring with the fluid it will see, and do not roll it into the groove. Read more

This group shows a single part: DORMAN 82560.

This table covers the oil pans that hold the engine's oil sump. Read more

4 Oil Pan parts for the 2003 Isuzu NPR come from 2 brands — DORMAN and SKP.

This group includes DORMAN 2645601, DORMAN 264132 and SKP SK2645601 and the remaining parts above.

This table covers the gaskets between the oil pan and the block. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

3 Oil Pan Gasket parts are listed for the 2003 Isuzu NPR, from FEL-PRO, SKP and ULTRA-POWER.

This group includes FEL-PRO OS34500R and SKP SKOS34500R and the remaining parts above.

This table covers the pushrods that transfer lifter motion to the rocker arms. Read more

This group shows a single part: SBI 1921485.

This table covers the rocker arms that transfer cam motion to the valves. Read more

SBI supplies both parts for the 2003 Isuzu NPR.

This group includes SBI 1801228 and SBI 1811011.

This table covers the Timing covers. Read more

This group shows a single part: DORMAN 635505.

This table covers the turbochargers that compress intake air. Read more

2 Turbocharger parts are listed for the 2003 Isuzu NPR, from GPD and ROTOMASTER.

Part numbers include GPD 2511314 and ROTOMASTER A1250103N.

This table covers the Turbocharger cartridges. Read more

This group shows a single part: ROTOMASTER A1280202N.

This table covers the gaskets that seal the valve cover to the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

3 Valve Cover Gasket parts are listed for the 2003 Isuzu NPR, from FEL-PRO, SKP and ULTRA-POWER.

Part numbers include FEL-PRO VS50088R and SKP SKVS50088R, among others listed above.

This table covers the pressed-in bronze and cast-iron guides that align valve stems. Typical signs include oil smoke on startup, a guide that has gone oval, or a valve that no longer seats quietly. Guides are a machine-shop fit. Confirm stem diameter in the notes before ordering. Read more

4 Valve Guide parts are listed for the 2003 Isuzu NPR, from SBI and QUALCAST.

Listed part numbers: QUALCAST 303054, SBI 1403054 and SBI 1409946, plus the other parts above.

This table covers the lifters / tappets that transfer cam motion to the valves. Read more

2 Valve Lifter parts are listed for the 2003 Isuzu NPR, from ENGINETECH and SBI.

Listed part numbers: ENGINETECH LG2281K and SBI VL115.

This table covers the Valve seats. Read more

11 Valve Seat parts for the 2003 Isuzu NPR come from 3 brands — SBI, DURA-BOND and QUALCAST. The "Popular" part is DURA-BOND 30643.

This table covers the springs that close each intake and exhaust valve. Typical signs include a sagging corner, a broken coil, or a clunk from the spring pocket. Replace springs in axle pairs and inspect the seats. Read more

5 Valve Spring parts for the 2003 Isuzu NPR come from SBI.

This group includes SBI 1601551, SBI 1601552 and SBI 1601553 and the remaining parts above.

This table covers the keepers that lock each valve-spring retainer to the stem. Read more

This group shows a single part: SBI 1211003.

This table covers the seals on each valve stem that control oil into the guides. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

SBI supplies both parts for the 2003 Isuzu NPR.

Part numbers include SBI 1221369 and SBI 1221260.