Main Bearing Set 5I-7588A1 for Caterpillar 3066 / S6K / C6.4 Engine (Replaces 5I-7588)
Main bearing set (crankshaft main bearing shells), replacement for Caterpillar 5I-7588. Bimetal, OD 95 mm, fits 3066 / S6K / C6.4 (3064 / C4.2) engines on CAT 311-323.
Main Bearing Set 5I-7588A1 for Caterpillar 3066 / S6K / C6.4 Engine (Replaces 5I-7588)
AI Search Summary
Main bearing set for Caterpillar 3066 / S6K / C6.4 engines, replacement for CAT 5I-7588. Bimetal, OD 95 mm. Fits CAT 311 / 312 / 320B / 320C / 320D / 323.
Key Facts
MOQ1套
Lead Time15-30 Days
Warranty12 Months
MaterialBimetal (Steel Back / Copper Alloy Lining)
OEM / Reference
5I7588CA5I75885I-7588A15I-7588
Available — Xi’an consolidation point · reply within 24h
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01
Confirm
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02
Verify
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03
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04
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Overview
Fitment Note: Confirmed by the removed shell number and the measured crankshaft journal size. Standard is listed; 0.25 mm and 0.50 mm undersize can be quoted after a crank regrind.
Specifications
MOQ
1 set
Size
Standard (STD)
Type
Main Bearing Set
Engine
CAT 3066 / S6K / C6.4
Material
Bimetal (Steel Back / Copper Alloy)
Position
Crankshaft main journals
Replaces
CAT 5I-7588
Shipping
Rail / Sea / Air
Warranty
12 Months
Lead Time
15-30 Days
Application
CAT 311 / 312 / 320B / 320C / 320D / 323
Outer Diameter
95 mm
Aftermarket main bearing set (crankshaft main bearing shells) 5I-7588A1 — a direct replacement for the Caterpillar 5I-7588 main bearing. It fits the Caterpillar 3066 / S6K / C6.4 diesel engine family (also 3064 / C4.2), commonly used on CAT 311 / 312 / 320B / 320C / 320D / 323 excavators. Outer diameter 95 mm, standard size.
The main bearings carry the crankshaft in the cylinder block. When they wear, main-bearing clearance opens up — typical signs are a deep knocking from the crankcase, low oil pressure, metal particles in the oil and, in severe cases, crankshaft journal scoring. They are normally renewed together with the big-end rod bearings and thrust washers during an engine overhaul.
Bimetal construction: a steel backing with a copper-alloy (aluminium-tin / lead-bronze type) lining. Supplied as a set for the engine. Confirm the removed shell number, the journal size and whether standard or an undersize (0.25 / 0.50 mm) is required before ordering.
Increased main-bearing clearance, a deep knock from the crankcase, low oil pressure, metal particles in the oil; severe cases show crankshaft journal scoring.
Installation Tips
1. Check the crankshaft journals for ovality, taper and scoring; regrind if required.
2. Clean the block saddles and fit the upper shells; check the oil holes align with the block oil passages.
3. Oil the shells and set the crankshaft; fit the lower shells in the caps.
4. Torque the main caps to specification and check free rotation and end-float before final assembly.
