ACL Race Series main bearings for Peugeot TU3.2, TU3J2, TU5JP, TU5JP4
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Peugeot
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ACL Race Series main bearing set for Peugeot TU3.2, TU3J2, TU5JP, TU5JP4, part number 5M2797H. These support the crankshaft in the block and, in a tuned engine, their performance is critical for ensuring oil properly reaches the entire crankshaft.
These are tri-metal bearings: an SAE 1010 steel backing, a copper, lead, and tin layer of about 0.3 mm, a nickel barrier, and a surface overlay of lead, tin, and copper that conforms to the crankshaft surface and resists seizing.
The upper bearings feature a full 180° oil groove, while the lower ones have a partial groove to avoid restricting oil flow to the connecting rods, with a tapered groove end to prevent pressure spikes. ACL manufactures them with more "crush" (housing interference) than a standard bearing to ensure they stay securely in place and dissipate heat better, as well as greater eccentricity, which helps maintain the oil film when the housing deforms at high RPMs.
In standard size, ACL specifies this for a crankshaft journal of 49.962 to 49.981 mm, and for that diameter, it recommends an oil clearance of approximately 0.053 to 0.063 mm. If the crankshaft has been reground, the measurement changes.
They do not have the silver-tin final coating of standard bearings, so their dark, brownish-black and bluish color is factory-standard and does not indicate any defect. ACL advises against polishing the bearing surface to adjust clearance; if more is needed, they should be combined with the HX version, which provides an additional 0.025 mm of clearance.
Not sure if your crankshaft is standard size? Write to us with your engine code and we will help you choose.