Lexus SC 400 Water Pump for Sale | OEM Used Cast Iron Coolant Pump for the 1991 to 2000 SC 400 with the Legendary 1UZ-FE 4.0L V8
$129.00
At a Glance
- Condition: OEM used, function tested before shipping
- Availability: In stock, Lexus SC 400 water pump available
- Shipping: Free shipping to all 50 states, 3 to 7 business days
- Application verified (1991-2000 Lexus SC 400 with 1UZ-FE 4.0L V8)
- VVT-i vs non-VVT-i variant noted (1998 plus added VVT-i to the 1UZ-FE)
- Cast iron impeller condition documented
- Bearing condition assessed (no audible roughness, no shaft play)
- Weep hole condition checked (no coolant residue indicating prior leak)
- Gasket / O-ring surface inspected
- Pulley condition verified
- Timing belt service status noted (Lexus / Toyota recommends water pump replacement at every timing belt service)
- Backed by a 15 day replacement warranty against internal defects
Description
About the Lexus SC 400 Water Pump
Looking for a reliable cooling solution for your Lexus SC 400 luxury coupe? Part Nests stocks OEM used Lexus SC 400 water pumps for the 1991-2000 SC 400 powered by the legendary 1UZ-FE 4.0L V8, the engine that established Lexus reputation for V8 durability and refinement. The water pump is the heart of the engine cooling system, circulating coolant between the engine block, cylinder head, radiator, and heater core. Whether you are replacing a leaking pump during a timing belt service (Lexus / Toyota recommends water pump replacement at every timing belt service on the 1UZ-FE), addressing bearing noise, or completing a 1UZ-FE refresh, our inspected used Lexus SC 400 water pumps offer factory fitment at a substantial savings over OEM Lexus pricing.
Water Pump Overview: 1UZ-FE Architecture
The Lexus SC 400 uses the 1UZ-FE 4.0L V8, which is also found in the 1990-2000 Lexus LS400, 1998-2007 Lexus GS 400 / GS 430, 2001-2005 Lexus IS 430 (Japan only), and various other Toyota / Lexus applications across the 1990s and early 2000s. The water pump is a cast iron impeller / cast aluminum housing unit driven by the timing belt, characterized by:
- Cast iron impeller for excellent durability and corrosion resistance (a key reason the 1UZ-FE has its 300,000 plus mile longevity reputation)
- Cast aluminum housing for lightweight construction
- Timing belt driven, not belt-or-chain driven externally (this matters for service planning)
- Integrated thermostat housing on some variants
- Standard mechanical seal, with weep hole at the bottom for leak detection
The Legendary 1UZ-FE Engine
Understanding the context: the 1UZ-FE 4.0L V8 is one of the most respected production V8 engines ever built. Introduced in 1989 in the original Lexus LS400, the 1UZ-FE was Toyota engineering response to BMW / Mercedes / Audi V8s and was designed with extreme attention to durability:
- 32-valve DOHC, four valves per cylinder for excellent breathing
- Aluminum block and heads, lightweight construction
- Cast iron crankshaft, oversized main bearings
- Belt-driven dual overhead cams, with timing belt service at 90,000 miles
- 250 HP / 260 lb-ft early variants (1991-1997 non-VVT-i)
- 290 HP / 300 lb-ft VVT-i variant (1998-2000 SC 400, 1998-2000 LS400)
- 300,000 plus mile commercial-service-life reputation, the 1UZ-FE is legendary for longevity
The 1UZ-FE is widely considered one of the best Toyota engines ever produced. Many original SC 400 / LS400 / GS 400 owners report 250,000-400,000 plus mile lifespans on original engines with proper maintenance. The water pump (this listing) is a key part of that maintenance story: replacing the water pump at every timing belt service (every 90,000 miles) is the Lexus-recommended procedure that preserves the engine longevity reputation.
VVT-i vs Non-VVT-i: Variant Identification
The 1UZ-FE evolved in 1998 with the addition of VVT-i (Variable Valve Timing with Intelligence):
- 1991-1997 SC 400 (non-VVT-i), 250 HP / 260 lb-ft, original 1UZ-FE design
- 1998-2000 SC 400 (VVT-i), 290 HP / 300 lb-ft, with VVT-i variable valve timing on the intake camshafts
The water pump physical design is similar between variants but the gasket configuration and some bolt specifications differ between non-VVT-i and VVT-i engines. We verify your year and engine variant before shipping.
Lexus / Toyota V8 Cooling System Drivetrain Pairing
The Lexus SC 400 water pump (this listing) is the cast iron impeller / cast aluminum housing water pump for the 1UZ-FE 4.0L V8 platform. For complete Lexus / Toyota cooling system context across our catalog: the cooling system requires correct water pump (this listing) plus matching radiator plus matching thermostat housing. The Lexus LS460 radiator (our vaz632 listing, aluminum-core radiator with plastic end tanks for the 2007-2017 LS460 with 4.6L 1UR-FSE V8) is the cross-application Lexus radiator listing, though the LS460 uses the newer 1UR-FSE V8 NOT the 1UZ-FE family. The 1UR-FSE per the LS460 listing is the successor Lexus V8 architecture that replaced the 1UZ-FE family in the modern Lexus lineup. For broader cooling-system component context across our catalog, the Mazda 3 water pump (our vaz643 listing, engine-matched coolant pump for the Mazda3 lineup across BK / BL / BM / BN chassis generations with critical belt-driven MZR vs timing-chain-driven SkyActiv-G distinction) and the Audi Q7 water pump (our vaz687 listing, the belt-driven mechanical coolant pump for Audi Q7 European-market vehicles) are within-batch related water pump listings. For thermostat housing context, the Genesis GV60 thermostat housing (our vaz440 listing, with critical electric vehicle disambiguation since the GV60 is a BEV battery electric vehicle that uses a battery thermal management system NOT an engine cooling system) represents the related thermostat housing component category. Complete cooling system requires correct radiator plus matched water pump (this listing) plus matched thermostat housing plus correct coolant specification.
Why This is a “Replace at Every Timing Belt Service” Component
The 1UZ-FE water pump is driven by the timing belt, which Lexus / Toyota specifies for replacement every 90,000 miles. Because access to the water pump requires removing the timing belt cover and associated components (a labor-intensive job), the standard professional practice is to replace the water pump at every timing belt service, even if the existing pump shows no obvious failure. Reasons:
- Labor cost amortization, the timing belt service already requires the pump access; replacing the pump adds little incremental labor
- Risk prevention, a water pump failure between timing belt services means another labor-intensive teardown
- Bearing wear, even pumps that look fine externally can have worn bearings approaching failure
- Seal degradation, the mechanical seal degrades with thermal cycling
If you are buying a used SC 400 water pump for a timing belt service, you are following the recommended Lexus / Toyota maintenance practice.
Vehicle Compatibility
| Detail | Description |
|---|---|
| INCLUDED | The water pump as photographed. |
| NOT INCLUDED | Timing belt, gaskets, thermostat, pulleys, and coolant. |
| Tools You Need | Front-cover access tools, a crank-pulley holder, and fresh coolant; the smart play is pairing this with the timing belt service. |
Engine Variant Compatibility
| Detail | Description |
|---|---|
| Lexus SC 400 (Z30, 1UZ-FE 4.0L V8; donor 1992) | Year and build date confirmed by VIN per the live page |
| Lexus LS 400 (shared powertrain per the live page) | Closely related application; call with your VIN |
| SC 300 (inline-six cars) | Different engine, different pump |
| Reference Application | 1992 Lexus SC 400 |
Why Buy From Part Nests
- Application verified (1991-2000 Lexus SC 400 with 1UZ-FE 4.0L V8)
- VVT-i vs non-VVT-i variant correctly identified
- Cast iron impeller condition documented
- Bearing and seal condition assessed
- Weep hole condition checked
- Timing belt service status noted
- Free shipping to all 50 states
- 15 day replacement warranty on defects
- Lexus / Toyota experienced support team familiar with 1UZ-FE specifics
- Call (855) 634-4447 to confirm Lexus SC 400 water pump (cast iron impeller / cast aluminum housing OEM water pump for the 1991-2000 Lexus SC 400 powered by the legendary 1UZ-FE 4.0L V8 that established Lexus reputation for V8 durability and refinement, driven by the timing belt as part of the Lexus / Toyota recommended timing belt service procedure every 90,000 miles), application verified (1991-2000 Lexus SC 400 with 1UZ-FE 4.0L V8 engine, also compatible with related Toyota / Lexus 1UZ-FE applications including 1990-2000 Lexus LS400, 1998-2000 Lexus GS 400, 2001-2005 Lexus IS 430 Japan-only), VVT-i vs non-VVT-i variant noted (1991-1997 SC 400 non-VVT-i 250 HP / 260 lb-ft original 1UZ-FE design, OR 1998-2000 SC 400 VVT-i 290 HP / 300 lb-ft with VVT-i variable valve timing on the intake camshafts; the water pump physical design is similar between variants but the gasket configuration and some bolt specifications differ), cast iron impeller condition documented (excellent durability and corrosion resistance a key reason the 1UZ-FE has its 300,000 plus mile longevity reputation), cast aluminum housing condition assessed, bearing condition (no audible roughness no shaft play), weep hole condition checked (no coolant residue indicating prior leak), gasket / O-ring surface inspected (with note that VVT-i and non-VVT-i variants have different gasket configurations), pulley condition verified, timing belt service status noted (Lexus / Toyota specifies water pump replacement at every timing belt service every 90,000 miles since access to the water pump requires removing timing belt cover making the timing belt service the standard opportunity for water pump replacement), and Lexus / Toyota V8 cooling system drivetrain pairing context (Lexus LS460 radiator per vaz632 the cross-application Lexus radiator for the newer 1UR-FSE V8 platform that succeeded the 1UZ-FE family, Mazda 3 water pump per vaz643 the within-batch related water pump listing with critical belt-driven MZR vs timing-chain-driven SkyActiv-G distinction, Audi Q7 water pump per vaz687 the related European water pump for Audi Q7, Genesis GV60 thermostat housing per vaz440 with critical BEV disambiguation) before ordering
15 Day Replacement Warranty
Every used Lexus SC 400 water pump purchased through Part Nests carries a 15 day replacement warranty starting on the delivery date.
What Is Covered
- Internal defects already present when the water pump arrives
- Cast iron impeller failures within 15 days from installation
- Bearing failures within 15 days from installation (where condition was documented as serviceable at shipping)
- Shaft seal failures within 15 days from installation
- Weep hole leaks within 15 days from installation (where weep hole was documented as clean at shipping)
- Cast aluminum housing crack failures not disclosed at shipping
- Pulley failures within 15 days from installation
- Incorrect variant shipped (VVT-i vs non-VVT-i mismatch where year and engine were documented) due to an error on our end
What Is Not Covered
- Damage caused during installation
- Damage from incorrect coolant (Toyota Long Life Coolant red or pink, OAT formulation required; using generic green coolant or incompatible coolant types accelerates seal degradation)
- Damage from neglected coolant maintenance (Toyota / Lexus specifies 60,000-100,000 mile coolant change interval depending on year)
- Damage from overheating events
- Damage from timing belt service errors (incorrect timing belt installation or tension can damage the water pump)
- Damage from operating with worn cooling system components (failed thermostat, clogged radiator) that put extra load on the water pump
- Damage from incorrect torque specification when bolting to engine
- Damage from electrolysis in cooling system (improper ground or contaminated coolant)
- External components (timing belt, timing belt tensioner and idler pulleys, thermostat, gaskets if not supplied, coolant, hoses, radiator) unless itemized
- Labor expenses of any kind
To start a warranty claim, reach us within 15 days of delivery at (855) 634-4447.
- Function Tested Before Shipping: Bearing, impeller, and seal condition documented
- Application Verified: 1991-2000 Lexus SC 400 with 1UZ-FE 4.0L V8 correctly identified
- VVT-i vs Non-VVT-i Variant Noted: Critical for gasket and bolt compatibility
- Cast Iron Impeller Condition Documented: Key 1UZ-FE longevity component
- Timing Belt Service Status Noted: Lexus / Toyota recommends replacement at every timing belt service
- 15 Day Replacement Cover: Defects protected from delivery onward
Additional information
| Housing Material | OEM-cast metal |
|---|---|
| Impeller | Factory metal impeller |
| Mounting | Original bolt pattern & hub alignment |
| Sealing Interface | OEM gasket/seal fit |
| Weight | Approx. 5 to 7 lbs |
| Application | 1992 Lexus SC 400 |
| SKU | vaz678 |
Cast iron impeller / cast aluminum housing OEM water pump for the 1991-2000 Lexus SC 400. The Lexus SC 400 water pump is the cast iron impeller / cast aluminum housing OEM water pump for the 1991-2000 Lexus SC 400 powered by the legendary 1UZ-FE 4.0L V8 that established Lexus reputation for V8 durability and refinement. Features: cast iron impeller for excellent durability and corrosion resistance (a key reason the 1UZ-FE has its 300,000 plus mile longevity reputation), cast aluminum housing for lightweight construction, timing belt driven (NOT belt-or-chain driven externally, which matters for service planning), integrated thermostat housing on some variants, standard mechanical seal with weep hole at the bottom for leak detection. Compatible with 1991-2000 Lexus SC 400 and also related Toyota / Lexus 1UZ-FE applications including 1990-2000 Lexus LS400, 1998-2000 Lexus GS 400, 2001-2005 Lexus IS 430 (Japan only).
One of the most respected production V8 engines ever built with 300,000 plus mile longevity reputation. The 1UZ-FE 4.0L V8 is one of the most respected production V8 engines ever built. Introduced in 1989 in the original Lexus LS400, the 1UZ-FE was Toyota engineering response to BMW / Mercedes / Audi V8s and was designed with extreme attention to durability: 32-valve DOHC with four valves per cylinder for excellent breathing, aluminum block and heads for lightweight construction, cast iron crankshaft with oversized main bearings, belt-driven dual overhead cams with timing belt service at 90,000 miles, 250 HP / 260 lb-ft early variants (1991-1997 non-VVT-i), 290 HP / 300 lb-ft VVT-i variant (1998-2000 SC 400 / LS400), 300,000 plus mile commercial-service-life reputation. The 1UZ-FE is widely considered one of the best Toyota engines ever produced. Many original SC 400 / LS400 / GS 400 owners report 250,000-400,000 plus mile lifespans on original engines with proper maintenance. The water pump is a key part of that maintenance story: replacing the water pump at every timing belt service (every 90,000 miles) is the Lexus-recommended procedure that preserves the engine longevity reputation.
1998 added VVT-i variable valve timing to the 1UZ-FE. The 1UZ-FE evolved in 1998 with the addition of VVT-i (Variable Valve Timing with Intelligence). 1991-1997 SC 400 (non-VVT-i): 250 HP / 260 lb-ft, original 1UZ-FE design. 1998-2000 SC 400 (VVT-i): 290 HP / 300 lb-ft, with VVT-i variable valve timing on the intake camshafts. The water pump physical design is similar between variants but the gasket configuration and some bolt specifications differ between non-VVT-i and VVT-i engines. We verify your year and engine variant before shipping. The VVT-i upgrade in 1998 was substantial: 40 HP and 40 lb-ft increase from the same 4.0L displacement, achieved through the variable valve timing on the intake cams that optimized the engine breathing across the RPM range. The VVT-i 1UZ-FE was used through the end of SC 400 production in 2000.
Multiple cooling system components across our catalog. The Lexus SC 400 water pump (this listing) is the cast iron impeller / cast aluminum housing water pump for the 1UZ-FE 4.0L V8 platform. The Lexus LS460 radiator per vaz632 is the cross-application Lexus radiator listing (aluminum-core radiator with plastic end tanks for the 2007-2017 LS460 with 4.6L 1UR-FSE V8). The 1UR-FSE per the LS460 listing is the successor Lexus V8 architecture that replaced the 1UZ-FE family in the modern Lexus lineup. The Mazda 3 water pump per vaz643 is the within-batch related water pump listing (engine-matched coolant pump for the Mazda3 lineup across BK / BL / BM / BN chassis generations with critical belt-driven MZR vs timing-chain-driven SkyActiv-G distinction). The Audi Q7 water pump per vaz687 is the related European-market water pump listing (belt-driven mechanical coolant pump for Audi Q7). The Genesis GV60 thermostat housing per vaz440 represents the related thermostat housing component category (with critical BEV electric vehicle disambiguation since the GV60 uses a battery thermal management system NOT an engine cooling system).
Labor cost amortization and risk prevention. The 1UZ-FE water pump is driven by the timing belt, which Lexus / Toyota specifies for replacement every 90,000 miles. Because access to the water pump requires removing the timing belt cover and associated components (a labor-intensive job), the standard professional practice is to replace the water pump at every timing belt service, even if the existing pump shows no obvious failure. Reasons: Labor cost amortization (the timing belt service already requires the pump access, replacing the pump adds little incremental labor), Risk prevention (a water pump failure between timing belt services means another labor-intensive teardown to access the pump), Bearing wear (even pumps that look fine externally can have worn bearings approaching failure), Seal degradation (the mechanical seal degrades with thermal cycling). If you are buying a used SC 400 water pump for a timing belt service, you are following the recommended Lexus / Toyota maintenance practice.
Toyota Long Life Coolant red (pre-2004) or pink (2004 plus), OAT formulation. Toyota specifies Toyota Long Life Coolant for the SC 400 cooling system. For 1991-2003 SC 400 (and other 1UZ-FE applications from that era), the original Toyota Red Long Life Coolant is the proper specification. For 2004 plus Toyota / Lexus applications, the formulation changed to Toyota Pink Long Life Coolant (Toyota Super Long Life Coolant), which is the OAT (Organic Acid Technology) formulation. Using generic green coolant or incompatible coolant types accelerates seal degradation in the water pump. Coolant change interval is 60,000-100,000 miles depending on year per Toyota / Lexus service schedule. Maintain proper ground connections in the cooling system to prevent electrolysis (improper ground or contaminated coolant causes electrolysis that degrades aluminum and cast iron components). Cooling system flush at every coolant change removes deposits.
Multiple Lexus / Toyota V8 applications across the 1990s and early 2000s. The 1UZ-FE 4.0L V8 is also found in the 1990-2000 Lexus LS400, 1998-2007 Lexus GS 400 / GS 430, 2001-2005 Lexus IS 430 (Japan only), Toyota Soarer (Japan-market sister of the SC 400), Toyota Crown Majesta (Japan), Toyota Celsior (Japan-market LS400), and various other Toyota / Lexus applications across the 1990s and early 2000s. The water pump is generally compatible across the 1UZ-FE family within the same VVT-i vs non-VVT-i variant generation. Some applications may have specific gasket or bolt requirements; we verify the destination vehicle compatibility before shipping. The 1UZ-FE has also been heavily adopted by the engine-swap community due to its legendary reliability and aftermarket support, including swaps into other Toyota chassis, Lexus chassis, and even non-Toyota applications.
No. There is no core return required.
2 reviews for Lexus SC 400 Water Pump for Sale | OEM Used Cast Iron Coolant Pump for the 1991 to 2000 SC 400 with the Legendary 1UZ-FE 4.0L V8
Related products
Theodore P. –
Got a Lexus SC 400 water pump for a 1996 SC 400 timing belt service (within the 1991-1997 SC 400 non-VVT-i production window powered by the legendary 1UZ-FE 4.0L V8 producing 250 HP / 260 lb-ft, following the Lexus / Toyota recommended procedure to replace water pump at every timing belt service every 90,000 miles). Application verified as 1996 SC 400 with 1UZ-FE 4.0L V8 (within the 1991-2000 SC 400 production window), VVT-i vs non-VVT-i variant noted as non-VVT-i (NOT the 1998-2000 SC 400 VVT-i variant 290 HP / 300 lb-ft with VVT-i variable valve timing on the intake camshafts, the gasket configuration is different between variants), cast iron impeller condition documented (excellent durability and corrosion resistance a key reason the 1UZ-FE has its 300,000 plus mile longevity reputation), bearing condition assessed (no audible roughness, no shaft play), weep hole condition checked clean (no coolant residue indicating prior leak), gasket / O-ring surface inspected for non-VVT-i specification, pulley condition verified, timing belt service status noted. Honest pre-purchase information about the legendary 1UZ-FE engine context (300,000 plus mile commercial-service-life reputation, the engine that established Lexus reputation for V8 durability and refinement, 32-valve DOHC with aluminum block and heads and cast iron crankshaft with oversized main bearings) and the Lexus / Toyota V8 cooling system drivetrain pairing (Lexus LS460 radiator per vaz632 the cross-application Lexus radiator for the newer 1UR-FSE V8 that replaced the 1UZ-FE family, Mazda 3 water pump per vaz643 / Audi Q7 water pump per vaz687 / Genesis GV60 thermostat housing per vaz440 with critical BEV disambiguation).
Hyacinth M. –
Sourced a Lexus SC 400 water pump for a 1999 SC 400 VVT-i timing belt service (within the 1998-2000 SC 400 VVT-i variant production window 290 HP / 300 lb-ft with VVT-i variable valve timing on the intake camshafts). Application verified as 1999 SC 400 VVT-i, VVT-i variant correctly identified (NOT the 1991-1997 non-VVT-i variant with different gasket configuration), cast iron impeller condition documented, bearing condition assessed, weep hole condition checked, gasket / O-ring surface inspected for VVT-i specification. Honest pre-purchase information about the timing belt service standard procedure (Lexus / Toyota specifies water pump replacement at every timing belt service every 90,000 miles since access to the water pump requires removing timing belt cover, labor cost amortization plus risk prevention plus bearing wear plus seal degradation considerations) and the proper Toyota Long Life Coolant red or pink OAT formulation requirement (60,000-100,000 mile change interval depending on year).