CAT 8S9191 BOLT for C18 Caterpillar Part - WSTPARTS
WSTPARTS supplies the 8S9191 BOLT, a CAT Injector replacement part designed for Caterpillar C18, 3516B and C15 applications. It is categorized under Injector. Every unit is fitment-verified before dispatch. Manual reference: 3306: AIR INLET AND EXHAUST SYSTEM, group 030-7951, page 582; 3406C: BASIC ENGINE, group 129-3948, page 91.
8S9191 BOLT for Caterpillar C18 — Genuine CAT & Replacement Part
WSTPARTS supplies genuine CAT and OEM-equivalent direct-replacement BOLT (Part # 8S9191). Designed for CAT C18, 3516B, C15, 3516C, 3306, 3406C, 3406E, 3412C, 3508C, 3512, 3512C, 3516, 3606, 3608, 3616, C27, C32, G3508, G3608, G3612, G3616 equipment.
Compatible Models
Key Features
- ✔ 100% compatible with CAT C18, 3516B, C15, 3516C, 3306, 3406C, 3406E, 3412C, 3508C, 3512, 3512C, 3516, 3606, 3608, 3616, C27, C32, G3508, G3608, G3612, G3616
- ✔ Meets Caterpillar original quality and performance standards
- ✔ Genuine CAT lines: New Genuine / Cat Reman / Cat Classic | OEM-equivalent direct replacements
- ✔ Available for order, contact for lead time
Specifications
| Part Number (MPN) | 8S9191 |
| Product Name | BOLT |
| Brand | CAT |
| Applicable Models | C18, 3516B, C15, 3516C, 3306, 3406C, 3406E, 3412C, 3508C, 3512, 3512C, 3516, 3606, 3608, 3616, C27, C32, G3508, G3608, G3612, G3616 |
| Weight | 0.09 kg |
| Condition | New (Genuine CAT / OEM-equivalent direct replacement) |
| Warranty | 12 Months |
Where This Part Fits
Every row below is a real listing of 8S9191 in the Caterpillar parts manual: the machine it is published under, the system it belongs to, the group number and the manual page. Use it to confirm the part against your own parts book before ordering.
| Machine | System | Group No. | Manual Page |
| 3306 | AIR INLET AND EXHAUST SYSTEM | 030-7951 | p.582 |
| 3406C | BASIC ENGINE | 129-3948 | p.91 |
| 3406E | BASIC ENGINE | 127-1995 | p.169 |
| 3412C | BASIC ENGINE | 141-3228 | p.163 |
| 3508C | COOLING SYSTEM | 124-5142 | p.173 |
| 3512 | COOLING SYSTEM | 109-2332 | p.389 |
| 3512C | COOLING SYSTEM | 261-7305 | p.158 |
| 3516 | COOLING SYSTEM | 247-3796 | p.216 |
System Notes — AIR INLET AND EXHAUST SYSTEM
The air inlet and exhaust system covers the air cleaner housing and elements, intake piping, turbocharger, aftercooler, exhaust manifold, turbo mounting hardware and gaskets. It delivers clean, dense air and carries hot gas away. On this group, the two dominant failures are dust ingress and heat cycling: a leaking intake joint lets unfiltered air straight into the cylinders and dusts the rings in a few hundred hours, while exhaust manifold and turbo flange gaskets crack from repeated heat cycles and start whistling or sooting. Parts are replaced when boost drops, the intake tract shows dust trails past the filter, or a soot streak appears at a joint.
System Notes — BASIC ENGINE
The basic engine group covers the core structure and internals: cylinder block, cylinder head, pistons, rings, liners, connecting rods, crankshaft, bearings, camshaft and the gasket sets that seal them. These parts determine compression, oil pressure and power output. They wear gradually — rings lose tension, bearings show copper, liners glaze — and the first signs are usually blow-by from the breather, rising oil consumption, or a knock that gets louder as the engine warms. Replacing a basic engine part is a planned overhaul decision rather than a roadside fix, so matching the exact part number and serial number range matters more here than anywhere else on the machine.
FAQ
Is 8S9191 the right part for my machine?
Match the part number on your old part, or send us your equipment serial number — WSTPARTS verifies fitment free of charge for CAT C18.
Genuine CAT vs direct replacement — what is the difference?
Genuine CAT covers three factory lines: New Genuine, Cat Reman (core exchange with core charge) and Cat Classic (brand-new economy line). OEM-equivalent direct replacements are non-CAT parts; grade and warranty are confirmed in the quotation.
Stock, shipping and warranty?
Lead time confirmed on request; we quote the fastest available option. Every order is covered by a warranty per quotation.
📞 Get a Quote: Contact the WSTPARTS parts team | Email: cat@wstparts.com
