Caterpillar 299-5204 Piston Assembly
Specifications
| Part Type | Piston assembly (piston body with pin and pin locks/clips) | |
|---|---|---|
| Bore Size | 170 mm (Cat 3500-series long-bore piston) | |
| Construction | One-piece steel piston with oil-gallery cooling and combustion bowl (per IPD/Reliance equivalents) | |
| Pin Bore | 2.75 in (69.85 mm), bushing included (per IPD 2995204 equivalent) | |
| Valve Pockets | 0 (flat/bowl crown, no valve reliefs) | |
| Engine Family | Caterpillar 3500 series diesel (3508 / 3512 / 3516 and B/C variants) | |
| Compression Ratio | 14:1 (per Cat Parts Store listing description) |
Technical notes
The 299-5204 is Caterpillar's 170 mm long-bore piston used across the 3500-series diesel engine family, including the 3512B marine application along with 3508/3508B, 3512/3512C and 3516/3516B. Distributor listings describe it as a piston body supplied with pin and pin clips; aftermarket one-piece-steel equivalents (IPD/Reliance) feature a closed oil-cooling gallery and a combustion bowl crown with no valve pockets. Pin bore is 2.75 in (69.85 mm) with a bushing. The part is offered standalone as a piston assembly and within full cylinder packs (piston with pin and locks, ring set, and liner with O-rings). All corroborating sources catalog it strictly under diesel 3500-series engines; it is not the spark-ignited G3500 gas-engine piston.
Compliance
Sold as a Caterpillar OEM-numbered engine spare and replicated by aftermarket suppliers (IPD/Reliance, KMP) under the same OEM reference; no marine class-society certification is asserted by the distributor listings reviewed.
Compatibility
Other parts in this series
- Caterpillar 107-7330 Connecting Rod Bearing (STD) Pair
- Caterpillar 10R-5664 Remanufactured Lube Oil Cooler
- Caterpillar 123-8206 Cylinder Liner
- Caterpillar 127-5410 Camshaft
- Caterpillar 130-2608 Exhaust Valve Seat Insert
- Caterpillar 144-5695 Piston Ring (Intermediate / Compression)
- Caterpillar 149-6031 Main Bearing (Standard)
- Caterpillar 194-4897 Exhaust Valve
- Caterpillar 197-6995 Valve Guide
- Caterpillar 20R-1264 Remanufactured Electronic Fuel Injector
- Caterpillar 210-2529 Cylinder Head Exhaust Valve
- Caterpillar 211-7826 Cylinder Liner
- Caterpillar 212-8176 Water Pump
- Caterpillar 212-8177 Jacket Water (Fresh Water) Pump
- Caterpillar 242-5328 Cylinder Head (Bare)
- Caterpillar 282-8217 Aftercooler Core
- Caterpillar 313-7770 Fuel Transfer Pump
- Caterpillar 3512B Electronic Unit Injector (EUI)
- Caterpillar 3512B Naval Fuel Control Unit (ECCN 8A609)
- Caterpillar 3512B Turbocharger Cartridge
- Caterpillar 355-0769 Cylinder Head Gasket Set
- Caterpillar 468-8824 Intake Valve (Inlet Valve)
- Caterpillar 4W-4980 Oil Cooler Core
- Caterpillar 528-8365 Turbocharger Group
- Caterpillar 7C3614 Sea Water Pump
- Caterpillar 7N-2048 Camshaft Bearing
- Caterpillar 7N-3433 Rocker Arm Assembly
- Caterpillar 7W-5455 Bar Type Aftercooler Core
- Caterpillar 7W-6722 Governor / Speed Actuator Assembly
- Caterpillar 8N-2001 Oil Filter Base Assembly
Related
●RFQ answered within ~4 h at major hubs routed to vetted suppliers no public pricing
Frequently asked questions
- Does Caterpillar piston 299-5204 fit the 3512B marine engine?
- Yes. Multiple independent diesel-parts distributors list 299-5204 (2995204) as fitting the Cat 3512B, alongside the 3508/3508B, 3512/3512C and 3516/3516B engines in the 3500 diesel series.
- Is 299-5204 a complete cylinder kit or just the piston?
- 299-5204 itself is the piston assembly (piston body with pin and pin clips). It is also packaged into complete cylinder kits that add the piston rings and a liner with O-rings.
- Will 299-5204 work on a G3508/G3512/G3516 gas engine?
- No. Every corroborating source catalogs this piston under the 3500-series diesel engines only. The spark-ignited G3500 gas engines use different pistons, so 299-5204 should not be applied to gas variants.
Caterpillar 299-5204 Piston Assembly
No public pricing — quoted per request