TOYOTA 2AZ 04111-28133 full gasket kit

Full Analysis of Toyota 2AZ-FE Engine Overhaul Kit

The Toyota 2AZ-FE is Toyota’s classic 2.4L inline-four DOHC 16-valve VVT-i naturally aspirated engine with a displacement of 2362cc, bore 88.5mm and stroke 96mm. It has been widely installed on Camry, RAV4, Highlander, Estima, Alphard, Scion tC and other models for more than a decade.

Due to inherent factory design defects including oil consumption, stretched timing chains and cylinder head gasket leakage, the 2AZ overhaul kit has become a high-demand full engine repair kit for auto repair shops and auto parts traders. A comprehensive introduction is provided below covering five dimensions: applicable scenarios, component composition, specification classification, quality selection and common applicable faults.

Key Features

Q：Why the 2AZ Engine Requires Repair with an Overhaul Kit?

A：The 2AZ-FE engine features solid basic durability yet suffers from several recurring faults that can only be completely resolved via full engine overhaul, which constitutes the core application scenarios of overhaul kits:
Severe Oil Consumption (Most Common Defect): Especially prominent in 2007–2009 production batches. Original factory piston rings suffer insufficient sealing, resulting in oil consumption over 1 liter per 3,000 km, blue smoke on cold startup and carbon/oil buildup on spark plugs. Complete replacement of pistons and upgraded piston ring assemblies is mandatory.
Failed Cylinder Head Gasket (Coolant & Air Leakage): Threads on aluminum cylinder block and cylinder head are prone to stripping, leading to coolant intrusion into cylinders, oil-coolant mixing, high engine temperature and insufficient cylinder compression. A brand-new Multi-Layer Steel (MLS) cylinder head gasket must be replaced.
Worn Crankshaft & Connecting Rod Bearings (Oil Pressure Loss): Long-term oil shortage and improper maintenance scratch bearing surfaces, triggering abnormal idle noise and low engine oil pressure.
Aging Timing System Faults: Stretched timing chains and failed tensioners cause rattling noise on cold start and trigger P0016/VVT-i trouble codes. Severe cases will bend valves, so the timing kit shall be replaced simultaneously during overhaul.

Technical Specifications

Complete Component List of Standard 2AZ Overhaul Kit

Two versions are available on the market: basic economy overhaul kits and full heavy-duty overhaul kits. Main OEM part numbers are 04111-28101 and 04111-28133, with core components listed below:
Full Gasket Set (Standard for Basic Kits)

The full set of sealing gaskets forms the core of engine sealing system:
・MLS Multi-Layer Steel Cylinder Head Gasket, high temperature & pressure resistant to prevent blown head gasket
・Valve cover gasket, intake manifold gasket, exhaust manifold gasket
・Valve stem oil seals, front & rear crankshaft oil seals, various rubber O-rings, oil plug gaskets
・Auxiliary small seals including water pipe gaskets and vacuum pump gaskets

Piston & Piston Ring Assembly (Core Parts to Fix Oil Burning)
・4 STD standard pistons with factory standard bore size 88.5mm; oversize repair sizes +0.25mm and +0.50mm are available for overhaul. Pistons are coated with graphite to reduce cylinder wall wear.
・Matching piston rings: 2 compression rings + 1 oil control ring. Standard specs: Top ring 1.0mm, second ring 1.0mm, oil ring 2.0mm. Upgraded kits adopt optimized oil rings to permanently resolve original oil consumption defects.
・Full supporting accessories: piston pins and circlips

Bearing Set (Mandatory for Crankshaft Repair)
・Main crankshaft bearings, connecting rod bearings + thrust washers
・Sizes cover STD standard, +0.25, +0.50 and +0.75 four oversize grades, matched according to ground crankshaft dimensions. Leading brands adopt Japanese OEM materials from TAIHO and NPR for superior wear resistance and high-temperature oil pressure retention.

Extra Components Included in Premium Full Overhaul Kits
For engines with severe internal wear, full premium kits add the following parts:
Intake valves, exhaust valves, valve guides, valve seats
Cylinder head bolts (torque-to-yield bolts for one-time replacement)
Timing chain kit (chain, tensioner, guides, VVT sprockets)
Connecting rod assemblies, brand-new crankshaft (for severely worn crankshaft replacement)
Oil pump, water pump cooling assembly
Cylinder liners (optional for cylinder boring repair)

pecification Size Classification (Key Parameters for Purchasing & Repair)

Piston Bore Sizes

Standard base size: STD 88.5mm; Oversize repair sizes: +0.25mm, +0.50mm. Oversize pistons can only be used after cylinder boring machining.

Bearing Sizes

Main and connecting rod bearings are available in STD, +0.25, +0.50, +0.75 sizes, which must be matched to the actual ground dimensions of crankshaft main journals and rod journals.

Engine Model Differentiation

Strictly distinguish the mainstream 2AZ-FE model; do not mix parts with the hybrid 2AZ-FXE version, as internal components of the two models are non-interchangeable.

Overhaul Kit Quality Grades (Auto Parts Selection Reference)

Genuine OEM Parts: Toyota OEM original overhaul kits with fully matching part numbers, optimal fitment and longest warranty. Mainly used in authorized 4S dealerships with relatively high prices.

Japanese OEM Aftermarket Brands: Combined kits with top Japanese supporting brands including TEIKIN pistons, NPR piston rings, TAIHO bearings and GMB water pumps. Widely used in repair shops with high cost performance and durability close to genuine OEM.

Premium Chinese Aftermarket Parts: Precision-manufactured full overhaul kits complying with OE dimensional standards, featuring prominent price advantages. Widely used for export trade and mid-tier repair shops for budget-limited repair jobs.

Low-end No-brand Parts: Prone to aging rubber seals and low-wear-resistance bearings, which will lead to recurring oil consumption and leakage in short term. Long-term vehicle installation is not recommended.

Conclusion

The Toyota 2AZ-FE overhaul kit provides a one-stop parts solution to fix oil consumption, blown head gaskets and internal wear of this engine. Basic gasket sets suit minor leakage repairs, while full kits equipped with pistons and bearings are standard for permanent oil consumption resolution. For auto parts export or repair shop stock preparation, prioritize separating STD standard and oversize repair sizes. Matching core moving parts (pistons, rings, bearings) from Japanese OEM brands balances vehicle installation stability and profit margin.

Xingtai Panguli Sealing Technology Co., Ltd. (PL SEALS)

Xingtai Panguli Sealing Technology Co.,Ltd. was founded in 1997. Formerly known as Yuanfeng Rubber Products Factory, the company officially rebranded and upgraded in 2019. Located in Renze District, Xingtai, Hebei Province, the factory covers an area of 1 hectare and currently employs over 70 staff members.
With over two decades of expertise in rubber sealing products, the company has obtained multiple authoritative quality system certifications and established a complete, independent industrial chain spanning rubber mixing, product molding, intelligent inspection, automated packaging, and warehousing and shipping. With its own standardized internal mixing production workshop, large-scale molding and vulcanization production lines, precision quality inspection laboratory, fully automated vision sorting and packaging lines, and multi-level warehouse facilities, the company’s comprehensive in-house production equipment ensures full control over the entire sealing component manufacturing process, strictly regulating raw material formulations and finished product quality.
Backed by stable and superior product quality, the company has established long-term supply partnerships with major domestic engine manufacturers. At the same time, it actively expands into overseas markets and continuously engages in cross-border import and export trade. Its products are sold both domestically and internationally, earning consistent recognition from customers worldwide. The company consistently adheres to the business philosophy of “Quality First, Technological Innovation, Pursuit of Excellence, and Customer First.” Leveraging its in-house production capabilities and intelligent quality control system, it provides highly reliable sealing solutions for the automotive, construction machinery, and hydraulic equipment sectors.

Standardized Testing Laboratory

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Digital Quality Control Measures

Automated Intelligent Inspection Enables 100% Full Inspection

Large-Scale Multi-Level Smart Warehouse

Large-capacity warehouse space, efficient sorting and shipping coordination

Rubber Raw Material Compounding Production Workshop

6 SAG mills, Ø8.8×4.8Workplace Safety, Quality First, Striving for Excellence

Aerial View of the Entire Production Complex

Leveraging large-scale production capacity and a comprehensive, in-house production system

One-Stop Automated Packaging Production Line

We have developed a one-stop automated packaging production line that integrates the entire closed-loop production process—from inspection and sorting to sealing and boxing. At the front end of the line, a vision-based automatic inspection machine screens out defective products;合格 products are then conveyed via a conveyor belt to the automatic packaging machine for sealing. The line is further equipped with weighing, re-inspection, box-sealing, and palletizing equipment, with the final finished products transported to the shipping area. A flowchart of the automated packaging system is clearly displayed on the workshop walls, with standardized control over every process step and regulated management of the zones for products awaiting packaging and finished goods output. With minimal manual intervention throughout the entire process, the system balances production efficiency with packaging neatness, achieving standardized packaging of sealed products and efficiently meeting the delivery requirements of high-volume orders.

Why Choose PL SEALS ？

✔ Founded in 1997

✔ Own Mold Manufacturing Facility

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PL SEALS – Professional Sealing Solutions Since 1997