Td5 Oil Cooler Repair Kit – RK1127 – Defender & Discovery II

Fix Oil/Coolant Cross-Contamination & Restore Cooling Efficiency

This Td5 Oil Cooler Repair Kit (RK1127) is built to service and replace the factory cooler assembly PBC500230 on Td5 engines. Ideal for preventative maintenance or when symptoms appear (oil in coolant, external leaks, rising temps), this kit refreshes the cooler stack and sealing points to keep your Td5 running cool and clean.

What’s Included:

• Oil Cooler Assembly (replaces PBC500230)

• Housing Gasket

• Banjo Bolts (supply/return)

• Seals/O-rings for associated fittings

Why This Kit:

• Direct service solution for PBC500230 cooler assemblies

• Addresses common leak and cross-contamination failure modes

• Fresh hardware and seals for a complete, tidy repair

Fitment & Compatibility:

• Defender Td5 (1998–2006)

• Discovery II Td5 (1999–2004, L318)
  Td5 engines only. Not for V8 or Td4/Tdci.

Install Notes:

• Drain engine oil and coolant; replace both after repair

• Clean mating surfaces; torque fasteners to workshop specifications

• Inspect cooler lines/hoses; replace any swollen or oil-soaked hoses

• After refilling, bleed cooling system and check for leaks; recheck levels after first drive

FAQ:

Is this a complete cooler replacement for PBC500230?
Yes—this kit is designed to service/replace PBC500230, with cooler, housing gasket, banjo bolts, and seals.

Will it fix oil in coolant?
If the cooler core or seals were the source, replacing them typically resolves oil/coolant cross-contamination. Flush system thoroughly.

Does it fit non-Td5 Discovery 2 or Defender?
No—Td5 engines only. V8 and later diesel models use different coolers.

Part Number: RK1127 (services PBC500230)

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