Diesel Swap Reference — Start Here

Contributions welcome — this is a wiki. Anyone can edit this post. If you’ve done a swap, fill in real numbers, part numbers, and gotchas. Keep it factual, cite your source vehicle/year, and don’t paste copyrighted factory manuals — link to legitimate sources instead. The goal is one reliable starting point so nobody has to reinvent the whole swap from scratch.

This is the orientation map for engine swaps in the Isuzu world. It is a skeleton — the details below are placeholders for community-verified data. Read this top to bottom before you start cutting or buying, then dive into the model-specific build threads for your exact platform.

Before you start: plan the whole swap, not just the engine

A swap is never “just the engine.” Budget for engine + transmission/adapter + mounts + wiring + cooling + fuel + exhaust + intake + accessories + the small stuff that eats weekends. Decide your goals first (reliability vs. power, daily vs. trail), confirm it’s road-legal where you live, and write down your donor and recipient vehicle’s year/model so others can follow your numbers.

Common engine families

Pick your target engine and contribute what you know. Each section should eventually cover displacement/config, why people choose it, typical donor vehicles, known weak points, and what it physically needs to fit.

4JB1 (and 4JB1-T)

• Overview: (displacement, NA vs. turbo, typical power — contribute)
• Why people pick it: (contribute)
• Common donor vehicles: (contribute)
• Known weak points / things to check on a used core: (contribute)

4BD1 (and 4BD1-T)

• Overview: (contribute)
• Why people pick it: (contribute)
• Common donor vehicles: (contribute)
• Known weak points: (contribute)

6BD1

• Overview: (contribute)
• Why people pick it: (contribute)
• Common donor vehicles: (contribute)
• Known weak points: (contribute)

Other engines

• Add a new subsection for any other engine family the community swaps. Same structure as above.

Engine mounts

• Stock vs. custom mounts for each common chassis. (contribute)
• Mount fabrication notes, crossmember clearance, and where the engine wants to sit. (contribute)
• Hood/firewall/steering clearance gotchas. (contribute)

Transmission mating

• Bellhousing patterns and which transmissions bolt up to each engine. (contribute)
• Adapter plates and where to source them. (contribute)
• Clutch, flywheel, and pilot bearing combinations. (contribute)
• Driveline length changes and yoke compatibility. (contribute)

Wiring and engine management

• Mechanical-injection engines (minimal wiring) vs. electronically managed engines. (contribute)
• What you can delete, what you must keep (charging, glow plugs, fuel cutoff/shutoff solenoid, gauges). (contribute)
• Integrating with the recipient vehicle’s harness, ignition switch, and dash. (contribute)
• Glow plug controller wiring. (contribute)

Cooling

• Radiator sizing and whether the stock radiator is enough. (contribute)
• Hose routing, fan/shroud setup, and clearance. (contribute)
• Intercooler placement for turbo engines. (contribute)

Fuel system

• Lift pump / supply pressure requirements for the injection pump. (contribute)
• Tank, lines, return line, and filter/water-separator setup. (contribute)
• Diesel-specific concerns: water separation, fuel heating in cold climates, air bleeding. (contribute)

Exhaust and intake

• Manifold/downpipe routing and turbo clearance. (contribute)
• Air intake routing and filtration; snorkel notes if relevant. (contribute)

Accessories and the rest

• Power steering, A/C, alternator, vacuum (for brake booster on a diesel) — what carries over and what needs adapting. (contribute)
• Throttle/accelerator linkage or cable routing. (contribute)
• Gauges and senders (temp, oil pressure, tach signal source on a diesel). (contribute)

Build threads worth reading

Link the best model-specific swap build-log threads here so newcomers can jump straight to a proven write-up. (contribute)

Tag your swap thread with diesel-swap and engine (plus build-log/wip if it’s a project) so it shows up when people filter by topic across all model categories.