TD27 Diesel Fuel Injection Pump 16700-7F410 / 16700-7F400

Direct-fit Zexel VE distributor pump assembly for Nissan 2.7L diesel platforms. This unit integrates fuel pressurization, metering, and timing distribution within a compact rotary housing, serving the TD27, TD27T, and TD27Ti engine families across light commercial and off-road applications. Engineered to restore original fuel delivery characteristics in Terrano II R20, Navara D21, and Mistral diesel platforms, this pump eliminates guesswork in timing-critical repairs.

The 16700-7F410 pump body follows the Zexel VE rotary architecture, using a single 10mm plunger to serve all four cylinders at 2664cc displacement . Fuel delivery is governed through a mechanical centrifugal governor and a control sleeve mechanism that adjusts cutoff timing in response to load demand. The hydraulic head and distributor shaft are precision-matched to maintain ±3% cylinder-to-cylinder delivery variance. Sealing is accomplished through fluorocarbon O-rings rated for conventional diesel and B20 blends. Delivery valve holders use M12×1.5 high-pressure outlets, and the unit supports engine outputs spanning 62kW to 92kW across naturally aspirated and turbocharged variants .

The 16700-7F410 addresses the Nissan Terrano II R20 range produced from 1993 through 2007, covering both the 74kW TD27T intercooled variant and the 92kW TD27Ti high-output iteration . Navara D21 pickups from 1992 to 1997 equipped with the 2.7 D 4x4 drivetrain accept this pump directly, particularly in export markets where mechanical injection remained standard. Mistral R20 wagons built between 1994 and 1996 share the same pump architecture, though early and late production splits introduced minor governor calibration differences . Caravan E24 chassis with TD27 diesel power also fall within the compatibility envelope, with emphasis on steady-state torque delivery for load-carrying duty cycles.

Correct static timing is established through the plunger lift method at the rear of the pump head. For most TD27 applications, a dial indicator reading of 0.59mm to 0.60mm at TDC represents the baseline, though specific Mistral variants may require 0.45mm . The woodruff key on the pump input shaft must engage the drive gear keyway without deformation; any slop here translates into erratic injection timing and cold-start white smoke . The overflow valve beneath the banjo fitting regulates internal casing pressure, and a restricted return circuit will elevate pressure beyond specification, causing excess fuel delivery and idle instability. High-pressure lines should be treated as single-use items due to conical seat work-hardening. Before first start, prime the low-pressure chamber via the hand primer until bubble-free flow appears in the transparent return line.

In diesel repair shops, the decision to replace rather than reseal a VE pump typically hinges on plunger wear, delivery valve leakage, and governor response degradation. When hot-start difficulty coincides with elevated return fuel temperature, internal transfer pump wear is already accelerating, and assembly replacement generally carries lower comeback risk than partial overhaul . For parts distributors, the TD27 injection pump sustains demand across Southeast Asia, Australia, and African markets where these engines retain significant installed base . Pairing the pump with injector sets and return line kits improves order value per transaction and reduces fitment disputes.

Q1: Can I verify a TD27 pump is mechanical before quoting?
A: Look for a solenoid actuator on the pump body. Covec electronic variants on later Mistral and Terrano units carry different part numbers and cannot substitute for mechanical 16700-7F410 .

Q2: What causes low-power after turbo spool with a fresh pump?
A: Inspect the boost compensator diaphragm. A ruptured LDA diaphragm prevents the pump from sensing turbo pressure, starving fuel at full boost .

Q3: Do I need to replace injectors when installing a new pump?
A: Strongly recommended. Opening pressures drifting below 105bar will disrupt delivery calibration and produce idle roughness .

Q4: Is dial indicator timing mandatory on every installation?
A: Yes. Even keyway-indexed pumps require plunger lift verification to ±0.02mm to avoid excess hydrocarbon and hard cold start .

Q5: What is the most common cause of return-line fuel seepage?
A: A degraded overflow valve O-ring. This cheap component fails before the pump itself and mimics internal leakage symptoms .