ACL Nissan CA18/C20 Standard Size High Performance Main Bearing Set

ACL 5M1633H-STD is a main bearing set for the cataloged Nissan CA16, CA16DE, CA18, CA18DE engine configurations. STD manufacturer size designation; verify the exact engine and assembled clearance.

Bearing Configuration

H identifies the ACL Race Series family. Match the complete suffix to the required clearance, shell width and locating features.

Engine Application

ACLs 2023 guide pairs 4B1630 rods with 5M1633 mains for its CA16, CA18, CA18DET, CA20 and CD17 application group. It also lists 5M1633 mains for CD20/CD20-T diesel applications. A shared main-bearing family does not establish rod-bearing interchangeability; select the rod and main locations independently by the exact engine and measured dimensions.

The engine-family list identifies catalog applications, not universal vehicle fitment. Confirm the exact engine version, crankshaft, rods, block and bearing location. Vehicle names and photos do not replace dimensional verification.

Specifications

Quantity and Assembly Checks

Confirm the set contents, bearing positions and any separate thrust components against the complete manufacturer number. The photo is representative of the part family.

Measure shaft journals, housing bores and assembled oil clearance using the engine builders specification. Check oil-hole alignment, groove placement and crankshaft fillet clearance before final assembly. Catalog standard dimensions must not be treated as the finished dimensions for a different repair size. ACL specifies that abrasive pads or paper must not be used on the bearing surface to alter oil clearance.

Frequently Asked Questions

Is the year and model enough to choose this bearing? No. Match 5M1633H-STD to the exact engine and measured build specification.

What size is this listing? STD manufacturer size designation; verify the exact engine and assembled clearance.

Can I substitute a different suffix? Compare the complete grade, size, locating features and assembled clearance before substituting any bearing.

Related Engine Parts

For the cataloged CA16/CA18/CA18DET/CA20/CD17 application, see ACL 4B1630H-STD rod bearings. This is a separately sold component with its own measured journal clearance; confirm the exact engine and size before pairing parts.