Model Spotlight

International TD340 Crawler Dozer: Specs, Parts & Serial Numbers (1959–1965)

The diesel-engine half of the IH T340 / TD340 compact crawler pair. Built 1959 – 1965 at IH Louisville, the TD340 ran the IH BD-154 four-cylinder diesel — 154 cu in (2.5 L), approximately 40 HP — mated to a 5-forward / 1-reverse gear transmission. Same chassis, undercarriage, and blade hardware as the gas T340; only the engine and supporting systems differ.

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Broken Tractor Editorial Team• Updated May 2026• 8 min read

The International TD340 is the diesel-engine sibling of the T340 in IH's compact-crawler line of the early 1960s. It was produced from 1959 through 1965 at IH's Louisville Works, on the same chassis as the gasoline T340 but with the IH BD-154 four-cylinder diesel in place of the C-135 gas engine. Power output was modestly higher than the gas version — around 40 HP gross — and the diesel torque curve gave the TD340 a noticeably stronger feel under heavy load.

The TD340 represented the smallest dedicated diesel crawler in IH's industrial lineup of the era, sized for the small-construction, large-farm, and orchard niches where a TD-9 was too big and a gas engine wouldn't last under sustained working loads. Total production across the T340 / TD340 family was approximately 8,000 units over the seven-year run, with the diesel TD340 representing the majority of production toward the end of the run as buyers shifted away from gas crawlers.

At-a-glance specifications

Serial number location

The serial number plate on the TD340 is typically:

• Stamped on a data plate located on the left side of the frame, near the clutch housing
• May also be visible near the operator's seat or under the dash panel

Confirm the serial before ordering year-specific parts. The TD340 had several running production updates over its seven-year run, and certain service items (notably the injection pump calibration and some undercarriage hardware) differ between early and late builds.

The BD-154 diesel — what to know

The IH BD-154 is a four-cylinder, in-line, direct-injection diesel that became one of IH's most widely used small industrial diesel engines. The same engine family appears on the IH 354, 364, 384 and B-275 / B-414 farm tractors as well as on industrial sweepers, generator sets, and pumps. That broad application base is the most useful single fact about the TD340's engine for parts purposes: BD-154 service items source readily through the broader IH parts ecosystem rather than being trapped in a TD340-only catalog.

• In-line injection pump — Bosch or Roosa Master CAV pump depending on production year. The injection pump is the single most expensive engine-service item; a complete rebuild from a qualified diesel-pump shop is the standard fix when fuel delivery degrades.
• Direct injection — no glow plugs in the head; cold-weather starting relies on intake air heaters and starting fluid (sparingly). Cold-start performance was acceptable rather than excellent.
• Mechanical lift pump — driven off the camshaft, pulls fuel from tank to injection pump. Replace the lift pump diaphragm when fuel pressure to the injection pump drops.
• Direct-injection nozzles — four injectors, one per cylinder. Service intervals depend on fuel quality; plan for nozzle rebuild every 3,000 – 5,000 hours of heavy use.

Engine identification: TD340 vs. T340

Distinguishing the TD340 from its T340 gas sibling is straightforward:

• Injection lines — the TD340 has four hardline injection lines running from the side-mounted injection pump to the injectors on top of the head. The T340 has no injection lines — only spark plug wires running to spark plugs.
• No carburetor — the TD340 has an intake plumbing system feeding the in-line injection pump. The T340 has an updraft carburetor on the intake side.
• No distributor — the TD340 has no spark ignition components anywhere on the engine. The T340 has a distributor, coil, and plug wires.
• Fuel filter assembly — the TD340 has a fuel filter and water separator inline before the injection pump. The T340 has a simpler fuel filter.
• Block stamp — the BD-154 has "BD-154" or similar stamped on the block; the gas C-135 has its own marking.

Track and undercarriage

The TD340 shares its track and undercarriage with the T340 sibling. The components are unchanged between the two models — same chain, same grouser plates, same idlers, rollers, and sprockets. Common service items on a 60-plus-year-old machine:

• Track adjuster spring assemblies — spring-loaded recoil adjuster keeps track tension consistent under load. The spring fatigues with age.
• Master pins — used to break and reassemble the track for service.
• Grouser plates and track pads — wear with use, especially on hard surfaces.
• Idler and roller bushings — wear over decades.
• Final drive sprocket teeth — chord wear from chain elongation.

For undercarriage parts, many items cross-fit to other IH compact crawlers of the era. Our parts team can verify cross-references by serial number and physical comparison.

Common service items and what to expect

Injection pump wear

The single most common engine-service issue on a 60-plus-year-old BD-154 is injection pump degradation. Symptoms: hard starting, rough idle, smoking under load, power loss. Rebuilding the pump at a qualified diesel-injection shop typically costs less than replacement and restores factory performance. Confirm the pump is the original-fitment unit before sending it out — some TD340s have had pump swaps over the years.

Cooling system corrosion

Original radiator cores are typically corroded on any unrestored machine. Hose connections at the water pump and thermostat housing are routine items.

Steering clutch wear

Like the T340, the TD340 uses dry-disc steering clutches at each track. Wear at the clutch discs produces uneven steering response — the machine pulls to one side under power, or one track stops engaging fully. Replacement requires splitting the track-drive housing.

Hydraulic seal aging

Every blade cylinder has seals that are 60-plus years old. Reseal kits are usually sufficient — the bores are typically still good. Plan on rebuilding every cylinder as part of any restoration.

Wet-stacking on light-duty use

Diesel engines run light-duty (parade use, occasional yard work) for extended periods can develop "wet stacking" — unburned fuel and soot accumulating in the exhaust system. The cure is to put the engine under sustained load periodically; a 15-minute hard pull every few hours of light operation is usually sufficient.

Parts availability and cross-references

The TD340 is over 60 years old. Direct parts availability is limited, but the BD-154 diesel engine's broad application across the IH industrial line gives the TD340 a meaningfully wider service-parts ecosystem than the engine displacement alone would suggest. Most BD-154 engine internals and fuel-system components source through the broader IH parts catalog.

• BD-154 engine internals — pistons, rings, bearings, head gasket sets, water pumps, oil pumps. Cross to IH 354, 364, 384, B-275, B-414 service catalogs.
• Injection pump service — Bosch or Roosa Master CAV depending on production year. Qualified diesel-pump shops can rebuild either.
• Injectors — four direct-injection nozzles. Rebuildable by qualified shops.
• Undercarriage — cross to T340 sibling and other IH compact crawlers.
• Blade and hydraulics — most blade cylinder seals cross through standard hydraulic seal kits.

For broader parts work, see the Case & IH Dozer Specs and Information hub. Our parts specialists can locate cross-fit items by serial number and physical comparison.

Why the TD340 still matters

The TD340 occupies the same compact-crawler niche today that it did 60 years ago: small enough to trailer behind a 3/4-ton or 1-ton pickup, light enough to move around a small property without specialized equipment, and powerful enough for finish grading, light pad work, and orchard or vineyard service. The BD-154 diesel's fuel economy and durability under sustained light-to-moderate load make it well-suited to the kind of intermittent ownership most TD340s see today.

The trade-off versus the T340 sibling is initial cold-weather starting, fuel system complexity, and engine-rebuild cost — diesels are more difficult and more expensive to restore than gas engines if the original engine has failed. For owners weighing T340 vs. TD340 restoration, the choice often comes down to fuel preference and how much sustained work the machine will see: TD340 for working machines, T340 for lighter-duty hobby use.

Where it sits in the IH crawler family

The TD340 sat at the small end of IH's diesel crawler lineup. Above it were the TD-9, TD-14, TD-15, TD-18, TD-20, and TD-25 — progressively larger industrial crawlers. Its direct competition in the small-crawler market was John Deere's 1010 family. Below it in IH's own lineup was no dedicated diesel option — the smaller IH equipment was gas-only.