ID
1232552
$ 121.59
1-2 weeks delivery time
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The ZF 3217307021 Oil Cooler Pencil Anode is an OEM sacrificial protection rod engineered to protect marine oil coolers (ZF-branded and Mota heat-exchange units) from electrolysis, galvanic corrosion, and internal mineral attack. Features M18 × 1.5 thread plug, overall active rod section 20 mm length × 15 mm diameter, plug head width 23 mm, total weight 0.07 kg (0.15 lbs). Designed for continuous operation in cooler channels at 0°C to 120°C (32°F to 248°F). Optimized for saltwater, brackish water, heavy vibration zones, and high duty-cycle transmissions. Replacement interval typically 1–2 years depending on water chemistry and annual operating hours.
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ZF 3217307021 Oil Cooler Pencil Anode – M18x1.5 Sacrificial Corrosion Protection Rod + Plug for Marine Oil Coolers
Parameter Specification Brand / Manufacturer ZF (OEM) Part Number 3217307021 Component Type Sacrificial pencil anode with plug (corrosion protection rod) Cooler Compatibility ZF and Mota marine oil coolers (heat-exchanger / oil cooler circuit) Thread Size (Plug) M18 × 1.5 mm Active Rod Dimensions Length: 20 mm (0.79 in), Diameter: 15 mm (0.59 in) Plug Head Width 23 mm (0.9 in) Weight 0.07 kg (0.15 lbs) Temperature Range 0°C to 120°C (32°F to 248°F) Anode Material Zinc or Aluminum-based marine corrosion-resistant alloy (model dependent) Seal Material Synthetic oil-resistant rubber for leak-proof plug seat Protection Class Galvanic and electrolysis corrosion protection for cooler internal channels Expected Service Life 12–24 months depending on water conditions and annual running hours
Technical Benefits
- Absorbs electrolysis and galvanic corrosion before damage reaches the cooler walls
- Protects internal oil-water channels from saltwater mineral attack
- Maintains heat-exchange efficiency by reducing deposit adhesion
- Supports long duty-cycle marine gearbox and cooler circuits
- Direct-fit M18 plug ensures stable compression and zero-gap geometry
- Integrated plug head allows rapid onboard replacement service
Installation & Service Notes
- Mounts directly into cooler service port (M18 × 1.5)
- No special tools required – standard M18 socket or wrench fit
- Torque to OEM cooler plug seat specification (per service manual)
- Inspect every 6 months in salt or brackish water, replace when 50% depleted
Package Includes
- 1 × ZF 3217307021 pencil anode rod
- 1 × M18 × 1.5 plug with pre-installed sealing ring
- Service instruction tag on packaging
Designed to protect the nominal oil cooler integrity and pressure/temperature stability in marine oil-cooling and transmission cooler circuits.
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