Tri-metal crankshaft main bearings ACL Toyota 2GR-FE

The Toyota 2GR-FE engine

The 2GR-FE is Toyota's 3.5 litre V6 with twin overhead camshafts and 24 valves, fitted to the Camry, RAV4, Highlander, Previa, Sienna and Alphard. The crankshaft journal and housing dimensions are those of the ACL bearing set shown here, for four main bearings.

The crankshaft of this engine runs on four 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.

Tri-metal main bearings

Three layers make up a trimetal bearing: the steel back for stiffness, the copper-lead intermediate layer for load capacity, then the anti-friction running layer that protects the main journal. The complete set covers the four main bearings of the crankshaft. The upper and lower half shells are different: each goes in its own position.

Where an aluminium bi-metal bearing, designed for low to medium loads, withstands about 8,000 psi, a performance trimetal bearing goes up to 12,000 psi: 50% extra margin. That is what keeps it durable on an engine boosted by a turbo or supercharger, or pushed to high rpm.

Technical specifications

Technical guide

Designed for engine building and motorsport, these ACL trimetal main bearings carry much more load than an original bearing, whether the engine gains power, revs higher or receives a turbo or supercharger. They are available 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. That makes it possible to put a reground crankshaft back into service without changing range and to set the clearance for the oil and use.

The brand

ACL Bearing Company has been making high-performance engine bearings in Australia since 1949. Its Race Series offers precise trimetal bearings, available in many sizes and proven in tuned and racing engines worldwide.

Vehicle compatibility

This main bearing set fits the 2GR-FE engine of the following Toyota, Lexus and Lotus models: