CAT 167-8081 215.9mm Long Crankshaft Bearing Cap

CAT 167-8081 is a Caterpillar 215.9 mm long crankshaft main bearing cap, adapted for C15/C18 diesel engines (used in 385C/374D/390D excavators and 988H loaders). It is used to position the main bearing shell, fix the crankshaft, and distribute burst loads. The following is professional structured information.

Core Parameters (Professional Version)

Project Details
Basic Attributes
Model 167-8081, Quantity per Unit: 1 piece, Suitable for C15/C18 Engine 3rd Main Bearing Position, Matching Main Bearing Shell 160-1799 (φ100 mm journal), Matching Bolt 309-7365 (M16×1.5, Grade 8.8), Single Cover Weight: 3.8 kg, Locating Pin Hole φ12 mm (Tolerance H7)

Key Dimensions
Overall Length: 215.9 mm (Tolerance ±0.1 mm), Bearing Hole Diameter: 100 mm (Tolerance H7), Bolt Hole Pitch: 140 mm, Locating Pin Hole Spacing: 100 mm, Cover Thickness: 32 mm, Bearing Seat Surface Flatness: ≤0.02 mm, End Face Perpendicularity: ≤0.03 mm, Bearing Hole Cylindricity: ≤0.01 mm

Material and Process
Material: 42CrMo Alloy Steel (Quenched and Tempered) HB260–290), bearing seat surface hardened to HRC45–50 (depth 2–3 mm), surface roughness Ra≤0.8 μm, bolt hole internal thread accuracy 6H, locating pin hole reamed, cover surface powder coated (film thickness 60–80 μm), corrosion resistance rating IP65

Performance Parameters: Rated load ≥1200 kN (burst load), bolt preload torque 220 N・m +90° angle, operating temperature -30℃ to +150℃, bearing seat surface fit ≥95% (coloring method test), fatigue life ≥10000 hours (rated operating conditions)

Compatible Engines: Cat C15/C18 diesel engine, compatible with 385C/374D/390D excavators, 988H loaders, 777G mining trucks, matching cylinder block 337-0201 (C18), 160-3912 (C15), main journal diameter 100 mm (tolerance f7)

Installation and Maintenance Points:

Before installation, clean the bearing housing surface and locating pin holes, checking for cracks/deformation. Apply Cat MTO-1000 grease to the back of the main bearing shell. The clearance between the bearing cap and the cylinder block locating pin should be 0.01–0.03 mm. Tighten the bolts in the sequence of “cross preload → 220 N・m → +90° rotation” (bolts are for single use only).

After installation, use a plastic clearance gauge to check the radial clearance of the main bearing shell (standard 0.03–0.06 mm, limit 0.12 mm) and axial clearance (standard 0.08–0.15 mm, limit 0.25 mm). Ensure there is no leakage from the bearing housing surface and that the crankshaft rotates smoothly without jamming.

Check bolt torque every 5000 hours, disassemble and inspect bearing cap deformation every 10000 hours (replace if flatness > 0.05 mm), and replace immediately if peeling/cracks are found on the bearing seat surface to prevent crankshaft seizure.