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4.8L 24v - TB48DE
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4.8L 24v - TB48DE
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Set of 6 forged 4340 steel connecting rods for the Nissan Patrol Y61 4.8 TB48DE.
The TB48DE is a 4,759 cc inline-six developed by Nissan for the Patrol Y61 (GR and GU series). With dual overhead camshafts and 24 valves, this naturally aspirated, cast-iron-block engine delivers around 245 hp (180 kW) at 4,800 rpm and 420 Nm at 3,600 rpm. Built from 2001 to 2016, it powered the Patrol across the Middle East, Africa and Oceania, where its toughness and low-end torque built its reputation. Its over-engineered design made it a favourite tuning base: once forced induction is added, the TB48DE easily exceeds twice its factory output, loading the rotating assembly far beyond stock tolerances.
That architecture, designed to haul heavy loads over broken tracks, nevertheless shows its limits as soon as power is asked of it: the standard TB48DE rod remains a mass-production part, sized for 245 hp at 4,800 rpm, not for the boost pressure and engine speeds of a tuned build. It is the first part to give way, usually at the big end or at the bolt, and it takes the crankshaft and the block with it. A weight-matched set of forged rods, fitted together with forged pistons, is the entry condition for using the 4.8-litre potential over the long term.
| Reference | Brand | Profile | Hardware | Pin diameter OEM 23 mm | Small-end width | Big-end diameter | Big-end width | Center-to-center OEM 163,45 mm | Weight |
|---|---|---|---|---|---|---|---|---|---|
| 14000-6 | Manley | H | ARP 2000-3/8"-41mm | 23 mm | 60 mm | 32,77 mm | 163,45 mm | 820 g | |
| 14429-6 | Manley | I-HD | ARP 2000-3/8"-41mm | 23 mm | 60 mm | 32,77 mm | 163,45 mm | 800 g |
| Rod | Hardware | Torque | Recommended stretch |
|---|---|---|---|
| Manley (14000-6) | ARP 2000-3/8"-41mm | 88,1 N·m | 0,147 - 0,157 mm |
| Manley (14429-6) | ARP 2000-3/8"-41mm | 81,3 N·m | 0,147 - 0,157 mm |
Indicative figures, bolts lubricated with ARP assembly lube. Measuring bolt stretch with a dial gauge remains the most reliable way to ensure even preload.
The forged connecting rods offered here replace the standard TB48DE items as soon as the engine leaves its factory specification. Hot-forged from solid, then machined and ground, they answer bending, compression and fatigue loads with a margin the production rod, designed for utility use, simply does not have. On a 4,759 cm³ straight-six whose torque arrives very low, it is the big end and its bolts that absorb the pressure peaks: both are sized accordingly, with ARP 2000 hardware in 3/8" 41 mm. These rods suit the real-world use of a tuned Patrol: rally raid and long off-road stages, rock crawling and dune running where the engine works at full torque under high heat, and above all drag racing, a discipline in which the boosted TB48 is a recognised platform. They support Stage 2 and Stage 3 builds, up to Stage 4 and beyond, where boost pressure and engine speed go far past the factory brief. Two profiles are available: the H-beam, cut out for torque and high boost, and Manley’s I-HD (Pro Series I-Beam Turbo Tuff), lighter, favouring high-rpm stability.
| 4340 is a low-alloy nickel-chromium-molybdenum steel chosen in aerospace as much as in motorsport for its behaviour under repeated loading. Hot forging aligns its grain flow with the direction of the loads; quenching and tempering then set the final balance between hardness, toughness and ductility: under overload it deforms before it breaks, where a harder material would snap. Compared with a sintered-metal factory rod optimised for production cost, a forged 4340 rod gains around 19 % in yield strength, 8 % in tensile strength and above all 19 to 37 % in fatigue strength, giving a service life under cyclic load several times longer. On a boosted TB48DE, where cylinder pressure and torque go well beyond stock figures, it is that fatigue reserve that separates an engine which lasts the season from a short block to rebuild. |
Two profiles are available depending on your project:
 | H-beam profile: the H section, with two solid flanks joined by a central web, offers the greatest stiffness in bending as well as in compression. Slightly heavier than an I-beam, it puts strength first: the logical choice on a 4.8-litre torque engine, in rally raid as in drag racing, where the rod absorbs high cylinder-pressure peaks at moderate engine speed. |
 | I-HD profile (Pro Series I-Beam Turbo Tuff, Manley): a reinforced version of the I-beam, whose thinner central section cuts reciprocating mass and therefore the inertia of the rotating assembly. The shoulders and the big end are thickened to carry high loads, which makes it the sensible compromise when the aim is to rev the TB48DE higher without giving up strength. |
  | Each rod ships with its ARP 2000 hardware, made in the USA. This alloy offers a tensile strength of around 220,000 psi (~1,517 MPa), well above stock bolts. In 3/8", the diameter used here, it handles up to about 200 hp per cylinder and engine speeds up to 8,500 rpm. Tough, reliable and versatile, ARP 2000 can be reused provided the stretch procedure is followed and has no particular storage constraints, making it a standard for rally, circuit, drift, drag and hillclimb. |
 | Manley Performance is an American manufacturer of competition engine parts and a member of the Wiseco group. Renowned for their consistency and endurance, Manley rods are found in rally and circuit engines as well as the most demanding drag and drift builds. Its rods are forged, machined, then inspected and matched by set, with tightly controlled weight variation between rods. |
| Rod-bolt preload is controlled by length, not torque alone. Using a stretch gauge, the bolt is measured relaxed then tightened: the difference must match the recommended stretch (here 0,147 to 0,157 mm). This method ensures even preload across all rods, removes the uncertainty caused by thread friction and is the reference for a reliable high-performance build. |
 | 1) Small end 2) Small-end diameter 3) Rod beam 4) Rod bolt 5) Big end 6) Rod nut / bolt 7) Rod cap 8) Big-end diameter 9) Center-to-center |
The vehicles in the table below leave the factory with the Nissan 4.8L 24V TB48DE engine. Confirm the piston pin diameter and the centre-to-centre length of your rods before placing an order.
| Make | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Nissan | Patrol (Y61) | TB48DE | 245 hp (180 kW) | 2001-2016 |
OEM reference: not sold separately by the manufacturer (set of 6 rods).
Investing in forged rods protects the whole engine. The price of a rod set is nothing compared with engine failure, which often takes the piston, crankshaft and block with it. On a built TB48DE the stock rotating assembly becomes the weak link: making it reliable with 4340 forged rods and ARP 2000 hardware extends engine life and lets you chase performance with confidence.
The arithmetic is simple: rebuilding a TB48DE after a rod failure means buying the crankshaft, the pistons and often the block again, whereas a set of forged rods fitted beforehand costs a fraction of that invoice. On a Patrol built for raid events or drag racing, often far from any workshop, that reliability is worth as much as the power gained.
