Tecnoseal General Motors Zinc Pencil Anodes for Marine Engine Heat Exchangers

Tecnoseal General Motors Zinc Pencil Anodes for Marine Engine Heat Exchangers

Tecnoseal General Motors zinc pencil anodes are designed to provide sacrificial corrosion protection for compatible marine engine heat exchangers and cooling-water systems. These replacement zinc rods help protect metallic components exposed to cooling water against galvanic corrosion.

The range includes four models with cylindrical zinc bodies measuring from 12 to 19 mm in diameter and from 40 to 85 mm in length. Each anode features an integrated threaded mounting extension for installation into a compatible existing fitting. Available connection sizes include 3/8" UNC, 7/16" UNC and 5/8" UNC.

The 02000 and 02002 models have the same 54 mm body length but differ in diameter and mounting thread. The longer 02001 measures 19 x 85 mm, while the compact 02003 features a 12 x 40 mm zinc body. Individual weights range from 0.03 to 0.18 kg.

All four versions use the T1 pencil configuration and are supplied as zinc anodes only, without separate brass plugs. Selected models correspond to General Motors original part numbers 8517480, 8515851 and 8515842.

Key Features

• Manufacturer: Tecnoseal
• Compatible Brand: General Motors
• Product Type: Sacrificial pencil anode
• Material: Zinc
• Application: Marine engine heat exchangers and cooling systems
• Configuration: Anode only, without brass plug
• Available Models: 02000, 02001, 02002, 02003
• Body Diameters: 12, 16 and 19 mm
• Body Lengths: 40, 54 and 85 mm
• Mounting Threads: 3/8" UNC, 7/16" UNC and 5/8" UNC
• Pencil Type: T1
• Weight Range: 0.03–0.18 kg

Available Models and Technical Specifications

Individual Model Specifications

Tecnoseal 02000 – General Motors Zinc Pencil Anode Ø16 x 54 mm, 7/16" UNC

The Tecnoseal 02000 features a cylindrical zinc body measuring 16 mm in diameter and 54 mm in length. Its integrated mounting extension measures 12 mm and has a 7/16" UNC threaded connection. Weighing 0.08 kg (0.18 lbs), this anode corresponds to General Motors original part number 8517480 and is also referenced as Tecnoseal 08500.

• Product Code: 02000
• Original Part Number: 8517480
• Equivalent Reference: 08500
• Material: Zinc
• Body Diameter (Ø): 16 mm (0.63 in)
• Body Length (l): 54 mm (2.13 in)
• Threaded Extension (l1): 12 mm (0.47 in)
• Mounting Thread (b): 7/16" UNC
• Weight: 0.08 kg (0.18 lbs)
• Pencil Type: T1
• EAN: 8033837066897

Tecnoseal 02001 – General Motors Zinc Pencil Anode Ø19 x 85 mm, 5/8" UNC

The Tecnoseal 02001 is the longest zinc pencil anode in this General Motors selection, featuring a 19 mm diameter body measuring 85 mm in length. Its 14 mm threaded mounting extension uses a 5/8" UNC connection. The anode weighs 0.18 kg (0.40 lbs) and corresponds to original part number 8515851.

• Product Code: 02001
• Original Part Number: 8515851
• Material: Zinc
• Body Diameter (Ø): 19 mm (0.75 in)
• Body Length (l): 85 mm (3.35 in)
• Threaded Extension (l1): 14 mm (0.55 in)
• Mounting Thread (b): 5/8" UNC
• Weight: 0.18 kg (0.40 lbs)
• Pencil Type: T1
• EAN: 8033837066927

Tecnoseal 02002 – General Motors Zinc Pencil Anode Ø19 x 54 mm, 5/8" UNC

The Tecnoseal 02002 combines a 19 mm diameter zinc body with a length of 54 mm. It features a 14 mm mounting extension with a 5/8" UNC thread, matching the mounting specification of the longer 02001 model while offering a shorter sacrificial zinc element. The anode weighs 0.10 kg (0.22 lbs) and corresponds to General Motors original part number 8515842.

• Product Code: 02002
• Original Part Number: 8515842
• Material: Zinc
• Body Diameter (Ø): 19 mm (0.75 in)
• Body Length (l): 54 mm (2.13 in)
• Threaded Extension (l1): 14 mm (0.55 in)
• Mounting Thread (b): 5/8" UNC
• Weight: 0.10 kg (0.22 lbs)
• Pencil Type: T1
• EAN: 8033837066910

Tecnoseal 02003 – General Motors Zinc Pencil Anode Ø12 x 40 mm, 3/8" UNC

The Tecnoseal 02003 is a compact zinc pencil anode measuring 12 mm in diameter and 40 mm in length. Its integrated 10 mm threaded extension features a 3/8" UNC connection. Weighing 0.03 kg (0.07 lbs), the anode provides a smaller replacement configuration for compatible General Motors marine cooling system applications. This version is also referenced under Tecnoseal codes 02027, 02033 and 02052.

• Product Code: 02003
• Equivalent References: 02027, 02033, 02052
• Material: Zinc
• Body Diameter (Ø): 12 mm (0.47 in)
• Body Length (l): 40 mm (1.57 in)
• Threaded Extension (l1): 10 mm (0.39 in)
• Mounting Thread (b): 3/8" UNC
• Weight: 0.03 kg (0.07 lbs)
• Pencil Type: T1
• EAN: 8033837066941

Original Part Numbers and Cross-References

Application and Compatibility

• General Motors marine engine cooling systems
• Compatible marine engine heat exchangers
• Cooling-water installations with replaceable sacrificial pencil anodes

Model Selection

Select the required Tecnoseal General Motors pencil anode by matching the original part number, zinc rod diameter, body length, threaded extension length and mounting thread.

The 02001 and 02002 models share a 19 mm body diameter and 5/8" UNC mounting thread but differ in length: 85 mm for the 02001 and 54 mm for the 02002. The 02000 has a 16 mm diameter with a 7/16" UNC connection, while the smaller 02003 measures 12 x 40 mm and uses a 3/8" UNC thread.

Supply: All four models are supplied as individual zinc sacrificial anodes without brass mounting plugs.