What 13 years of owner threads on defender2.net, AULRO and disco3.co.uk say about the one nut that turns a 40-minute swap into a lost weekend — and how to do it on your own, in order.
Use this guide alongside your workshop manual (RAVE / Haynes). Your manual's torque figures and safety steps always come first. Print it from your browser if you want it in the garage.
1. Before you start
“Spent half an hour trying to use a 13 mm on the top but before you told me it was 15mm” — Td5 owner, YouTube comments, 2026
Kit list
| Item | Why |
|---|---|
| FlatReach + its 3/8" adapter | Holds the socket square on the top nut and puts your ratchet 39 cm away where it can swing. |
| 15 mm 6-point 3/8" socket (plus 16 and 17 mm) | Owners who used 12-point sockets report rounding the nut. Six-point grips the flats. |
| 13 mm socket, ratchet and a short extension | The lower bolts and most cable nuts. |
| A breaker bar | To crack anything tight where you can reach it. FlatReach is rated to 72 Nm: use it to reach and run the nut, not to fight a seized one. |
| Penetrating oil, wire brush, head torch | Age, quarry dust and thread lock are common on these nuts. It's dark down there. |
| The magnetic pick-up (in your kit) | For the washer or bolt that drops into the bellhousing area. |
| Something to lie on | Half the threads were written after a job on gravel, in snow, at minus 2. |
2. The job, in order
This is the order owners settle on after doing it more than once. Exact fixings vary by model year and by what previous owners have done — follow your manual where it differs.
- Battery negative off. Note how the starter cables are routed before you disconnect anything.
- Get access from below. Remove the undertray if fitted. Clean around the starter with a brush and spray penetrating oil on the fixings — give it time while you do the next step.
- Disconnect the cables at the solenoid: the main feed and the small trigger wire. Bag and label the nuts. Put a nut back on its stud loosely if you like, so it can't go missing.
- Lower fixings first. These are the easy ones — usually a couple of minutes with a 13 mm.
-
The top nut (the one that hurts). Click your 15 mm 6-point onto the FlatReach — the spring-ball holds it, so it can't drop off. Feed the flat bar in past the fuel cooler from above, or up past the chassis rail from below, whichever gives you the clearer line on your vehicle. Seat the socket fully on the nut, then put your ratchet on the far end, out where there's room, and turn.
If it won't move: stop. Don't lean past 72 Nm. More oil, then crack it with a breaker bar wherever you can get a straight line, and only then go back to the FlatReach to run it off. - Ease the starter out. It's heavy and it will try to drop; support it. Owners on Pumas with air-con describe it as very tight on left-hand-drive — take your time on the angle out.
- Bench work (if you're refurbishing): a solenoid contacts kit is a few quid against a new starter. Several owners refresh contacts before they wear out, to avoid being stranded.
- Refit in reverse. Start every nut and bolt by hand. Run the top nut back on with the FlatReach, then tighten to your manual's figure — within the tool's 72 Nm rating, with a torque wrench on the far end where you can. Cables back on, tidy and clear of the exhaust, battery last.
3. Forum-tested tips (and traps)
| Trap | What owners learned |
|---|---|
| Rounding the top nut | 12-point sockets and a socket sitting at an angle are how it happens. A rigid bar keeps the socket square; six-point keeps the grip. |
| Thread lock / corrosion | Some owners found thread lock on the top nut, others found it rusted. Oil early, crack with a breaker bar, never fight it through an extension. |
| Dropped socket or washer | “dropping the bolts (often) and then scrabbling around under the Landy” is the most common complaint. Socket detent + magnetic pick-up. |
| Taking parts off you don't need to | Fuel cooler, turbo hoses, coolant hoses, chopped undertrays — owners did all of it to reach the top nut. With a flat bar most people can leave them alone. |
| Needing a second person | “if you can source an assistant it gets much easier!” — because someone had to hold the socket on above. A socket that stays on removes that job. |
| Wrong size | Top is usually 15 mm, not 13 — and sometimes a replaced 16/17 mm. |
Symptoms worth acting on early
- A starter that only turns over after a tap with a hammer and a block of wood.
- Clicking but no crank, then fine on the next try.
- Slow cranking on a good battery.
Owners describe being caught out in supermarket car parks and on farm weighbridges. If you're seeing the symptoms, do the job on your driveway on your terms, not at the roadside.
4. Other jobs the same bar helps with
Owners name the same awkward fasteners again and again — anywhere the socket fits but the ratchet can't swing or a UJ folds:
- Puma 2.4 / 2.2: the EGR valve lower and rear bolts; the starter (tighter than the Td5).
- Td5: fuel pressure regulator / fuel pipe fixings at the head; turbo heat-shield bolts.
- Puma & Disco 3/4: alternator bolts with restricted access.
- Disco 3: rear chassis bolts behind the suspension parts.
- Towbar and chassis bolts where the ratchet hits the chassis rail.
Not for: large fan nuts (32/36 mm), impact guns, or seized fasteners beyond 72 Nm.
5. Roadside kit checklist
Many owners keep a simple rule: if it can't be fixed in an hour, call for recovery. This list is about making that hour enough.
- FlatReach + 3 adapters (39 cm — fits under a seat)
- 13, 15, 16, 17 mm 6-point sockets, 3/8" ratchet
- Magnetic pick-up, head torch, gloves
- Penetrating oil, cable ties, insulating tape
- A bit of something to lie on
Owner quotes are from public UK forum threads (defender2.net, disco3.co.uk, AULRO) and YouTube comments, 2012–2026, reproduced in short for reference. This guide is general information compiled from owner experience and is not a substitute for the manufacturer's workshop manual. Work safely; you are responsible for your own vehicle.