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36.6mm Core Plug

This 36.6mm core plug is used across a wide range of Volkswagen and Porsche engines to seal casting holes in the cylinder block or cylinder head. Core plugs (also known as frost plugs or expansion plugs) are installed during engine manufacture to close off the sand casting ports left behind after production.

Over time, core plugs can corrode, weaken, or begin to seep coolant or oil, especially on older engines or vehicles that have seen long storage or poor coolant maintenance. Replacing worn or leaking core plugs is essential when rebuilding engines or addressing coolant leaks, helping restore proper sealing and long-term reliability.

Manufactured to precise dimensions, this plug provides a tight interference fit in a 36.6mm bore, ensuring a secure seal once installed. Suitable for a wide variety of aircooled and watercooled VW engines, as well as selected Porsche applications.

Technical Details

  • Plug type: Core / frost / expansion plug

  • Outer diameter: 36.6mm

  • Application: Cylinder block or cylinder head

  • Quantity: 1 plug

Fitting Notes

  • Bore must be clean and corrosion-free before installation

  • Press-fit installation recommended

  • Often replaced during engine rebuilds or coolant system repairs

  • Consider replacing multiple plugs if corrosion is present


Vehicle Fitment Summary

Volkswagen

  • T25 / T3: 1980–1992

  • Golf Mk1 Cabriolet: 1984–1993

  • Golf Mk2: 1986–1992

  • Golf Mk3: 1992–1998

  • Golf Mk3 Cabriolet: 1994–2002

  • Golf Mk4: 1998–2006

  • Caddy Mk1: 1983–1992

  • Jetta: 1986–1992

  • Vento: 1992–1998

  • Polo Mk3 (6N): 1995–2002

  • T4 Transporter: 1991–2003

  • T5 Transporter: 2003–2015

  • T6 Transporter: 2016–2020

Porsche

  • 924: 1976–1985

This Part Fits: Type 25, T4 Transporter, T5 Transporter, T6 Transporter, Mk1 Golf, Mk1 Golf Cabriolet, Mk2 Golf, Mk3 Golf, Mk4 Golf, Mk1 Caddy, Jetta, Mk3 Polo, Porsche 924,

Availability: Stock Item

Item Name: Frost plug

Description: Frost Plug

Product Group: Engine

Group: Crankcase

Unit of Measure: Each

Manufacturer: JP

Dimensions:

Width: 37mm

Height: 37mm

Depth: 15mm

Volume: 20535mm3

Weight: 0.02kg

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