5I-7660 Crankshaft Rear Oil Seal for Caterpillar Excavators 320D 320C 312C 323D S6K Engine

5I-7660 Crankshaft Rear Oil Seal – High-Quality Aftermarket Replacement for Caterpillar Engines

Prevent oil leaks at the rear crankshaft in your Caterpillar S6K engine with this premium aftermarket 5I-7660 crankshaft rear oil seal. Engineered as a direct OEM replacement, it provides reliable sealing to retain lubricant, block contaminants, and protect bearings in high-vibration heavy-duty applications.

Key Benefits for Contractors and Operators

• Prevents Costly Oil Leaks: Keeps lubricant in and dirt out, reducing bearing wear and avoiding expensive engine damage.
• Direct Fit Installation: Matches genuine Cat specs for quick, no-modification replacement – easy to install during engine service.
• Built Tough for Heavy Duty Use: High-grade material resists abrasion, heat, and pressure for long-lasting reliability on job sites.
• Cost-Effective Alternative: OEM-level sealing at aftermarket pricing – ideal for fleet maintenance and budget-conscious operations.
• Fast Shipping: In stock and ready to ship within 1-3 days.

Compatible Caterpillar Models

This crankshaft rear oil seal is commonly used in S6K engines for excavators including (verify your engine’s parts manual for exact fit):

• 311, 311B, 311C, 311D LRR
• 312B, 312C, 312C L, 312D, 312D L
• 313D, 314C, 314D CR, 314D LCR
• 315D L
• 318B, 318C
• 319C, 319D, 319D L, 319D LN
• 320 L, 320B, 320B L, 320C, 320C FM, 320C L
• 320D, 320D FM, 320D FM RR, 320D GC, 320D L, 320D LN, 320D LRR, 320D RR, 320N
• 321C, 321D LCR
• 323D L, 323D LN, 323D SA

Specifications

Questions? Contact us for fitment confirmation or bulk pricing. We stand behind our parts with fast shipping and easy returns.