CAT 1J8668 STUD for C18 Caterpillar Part - WSTPARTS
The 1J8668 STUD is a genuine and high-quality OEM replacement part compatible with Caterpillar C18, G3616 and 3412C equipment. It is categorized under Bolt/Nut. Every unit is fitment-verified before dispatch. Manual reference: 3406E: BASIC ENGINE, group 131-8293, page 179; 3412C: GENERATORS, group 153-3088, page 836.
1J8668 STUD for Caterpillar C18 — Genuine & OEM Replacement Part
WSTPARTS supplies genuine and high-quality OEM replacement STUD (Part # 1J8668). Designed for CAT C18, G3616, 3412C, 3406C, 3406E, C27, G3612 equipment.
Compatible Models
Key Features
- ✔ 100% compatible with CAT C18, G3616, 3412C, 3406C, 3406E, C27, G3612
- ✔ Meets Caterpillar original quality and performance standards
- ✔ Genuine CAT parts with anti-counterfeit label | OEM alternatives with warranty
- ✔ Available for order, contact for lead time
Specifications
| Part Number (MPN) | 1J8668 |
| Product Name | STUD |
| Brand | CAT |
| Applicable Models | C18, G3616, 3412C, 3406C, 3406E, C27, G3612 |
| Weight | 0.05 kg |
| Condition | New (Genuine / OEM Equivalent) |
| Warranty | 12 Months |
Where This Part Fits
Every row below is a real listing of 1J8668 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 |
| 3406E | BASIC ENGINE | 131-8293 | p.179 |
| 3412C | GENERATORS | 153-3088 | p.836 |
| C18 | BASIC ENGINE | 131-8293 | p.217 |
| C27 | GENERATORS | 136-6677 | p.530 |
| G3612 | AIR INLET AND EXHAUST SYSTEM | 206-6540 | p.133 |
| G3616 | AIR INLET AND EXHAUST SYSTEM | 206-6540 | p.437 |
| 3406C | BASIC ENGINE | 165-3931 | p.301 |
| 3406E | BASIC ENGINE | 136-9503 | p.183 |
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.
System Notes — GENERATORS
The generators group covers the alternator end of a generator set: stator, rotor, exciter, bearings, coupling disc, terminal box and the voltage regulation hardware. It converts engine rotation into electrical output at a held voltage and frequency. Bearing wear and insulation degradation are the two long-term concerns — a bearing that starts to rumble will eventually seize and take the rotor with it, while moisture and heat slowly break down winding insulation. Parts in this group are replaced when vibration rises, when insulation resistance falls on a megger test, or when output voltage becomes unstable under load.
FAQ
Is 1J8668 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 vs OEM replacement — what is the difference?
Genuine CAT parts carry an anti-counterfeit label. OEM equivalents are built to the same specifications, bench-tested and supplied with full warranty at a better price.
Stock, shipping and warranty?
Lead time confirmed on request; we quote the fastest available option. Every order is covered by a 12-month warranty.
📞 Get a Quote: Contact the WSTPARTS parts team | Email: cat@wstparts.com
