Tri-metal crankshaft main bearings ACL Toyota 1AZ-FE 2AZ-FE

The Toyota 1AZ-FE, 2AZ-FE and 2AZ-FXE engines

The 1AZ-FE (2.0 litre), 2AZ-FE (2.4 litre) and 2AZ-FXE (2.4 litre hybrid) are Toyota four-cylinder petrol engines with VVT-i variable valve timing, fitted notably to the Camry, RAV4, Avensis, Highlander, Alphard and Previa. The crankshaft journal and housing dimensions are those of the ACL bearing set shown here, for five main bearings.

The crankshaft of this engine runs on five main bearings. Each journal turns between two half shells, one seated in the block and the other in the main bearing cap: they carry the crankshaft. The ACL Race Series tri-metal set shown here replaces them on built engines.

From the factory, Toyota fits these engines with main bearings under part number 11711-28010, and its workshop manual specifies a running clearance of 0.008 to 0.024 mm.

Tri-metal main bearings

A trimetal bearing combines three layers with complementary roles: a steel back that provides structural strength, a copper-lead intermediate layer that takes the heavy loads and an anti-friction running layer that protects the main journal. The complete set contains 0 half shells, i.e. The complete set covers the five main bearings of the crankshaft. The upper and lower half shells are different: each goes in its own position.

An aluminium bi-metal bearing, intended for low to medium loads, tops out at around 8,000 psi; a performance trimetal bearing holds up to 12,000 psi, 50% more load capacity. It therefore gains strength and service life on turbocharged, supercharged or high-revving engines.

Technical specifications

Technical guide

The ACL main bearings shown here are trimetal bearings built for engine tuning and racing. They withstand far higher loads than a standard bearing and come in several sizes: the standard size, a +0.025 mm size for a main journal that has only been polished, a +0.25 mm regrind size and the HX version with increased clearance for high-revving engines or engines needing a high oil flow. This range lets you refit a reground crankshaft without changing product line and match the clearance to the oil and use chosen.

The brand

Founded in Australia in 1949, ACL Bearing Company designs high-performance engine bearings. Its Race Series brings together precision trimetal bearings, offered in a wide choice of sizes and fitted to built engines around the world.

Vehicle compatibility

This main bearing set fits the 1AZ-FE, 2AZ-FE and 2AZ-FXE engines of the following vehicles: