597586 - Core Plug – Rear – 1"

- €2,30

€2,30

€2,30 - €2,30

€2,30

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Aftermarket: Quality alternative. This is a quality alternative, designed to fit and function like the original part, often at a more competitive price.

Core Plug (cup/expansion plug) seals a casting core hole in the cylinder block, fitted at the rear of the block.

It closes the openings left by the casting sand cores and, where it sits over the water jacket, can yield under pressure if coolant freezes. Cup-type plug, 1" (25mm) diameter.

Vehicle Model Land Rover Defender up to 2016
Land Rover Discovery 1 1989-1998 (L318)
Range Rover Classic up to 1994
Land Rover Series 2 and 3

Fitment Notes SERIES II/IIA — 2.25L 4-cyl petrol
SERIES III — 2.25L 4-cyl petrol
DEFENDER 1987-2006 — 2.25L petrol, 2.5L petrol, 2.5L NA diesel, 2.5L turbo diesel, 200Tdi
DISCOVERY 1 1989-1998 — 200Tdi (VIN FA393361 to WA799999)
RANGE ROVER CLASSIC 1992-1994 — 200Tdi (from VIN JA610294)
Location: rear of cylinder block, 1" (25mm)

Alternative Codes

597586

In stock 46 units

39 · Gouda 7 · Drachten

Express delivery available

When will my order arrive?

Order before 15:00 (Mon–Fri): same-day dispatch for in-stock items.
UPS Express (order before 14:00): dispatched today, delivered tomorrow where available.
Netherlands / Belgium / Germany: 2–4 working days.
Other EU countries + UK: 4–8 working days.
Outside EU/UK: delivery times vary — contact us for an estimate.

Items may ship from multiple warehouses at no extra cost.

Job kits containing this part

This part is included in 0 job kit(s) below. Pick the kit that matches your vehicle and job, then add what you need.

Frequently asked questions

What is the core plug (597586) for?

The core plug, also called a cup or expansion plug, seals a casting core hole in the cylinder block. This one is the 1 inch (25mm) cup-type plug fitted at the rear of the block. It closes the openings left by the sand cores used when the block was cast.

Why do core plugs fail?

Core plugs typically fail by corroding through from the coolant side, or by being pushed out if coolant freezes, which is why they're sometimes called frost plugs. A leaking rear core plug shows as coolant seeping from behind the block. Replace it once it weeps or corrodes.

Which engines use the 1 inch rear core plug 597586?

Core plug 597586 suits the 2.25 petrol, plus 2.5 petrol, 2.5 diesel and 200Tdi engines across Series, Defender, Discovery 1 and Range Rover Classic applications. It fits the 1 inch (25mm) core hole at the rear of the block. Match the size and location to your block before ordering.

Can a core plug be reused?

No, fit a new core plug whenever you knock the old one out. Cup plugs deform as they're driven into the bore to seal, so a removed plug won't seal reliably again. Clean the bore and fit a fresh 25mm plug with sealant.