QD32 engine: specifications, device, repair

2024 Author: Erin Ralphs | [email protected]. Last modified: 2024-02-19 11:42

Diesel engines motorists have appreciated for a long time. This is an opportunity to save on fuel and ride comfortably. In maintenance and repair, they are much easier compared to gasoline counterparts. On the agenda is the QD32 engine, the technical characteristics of which attract the attention of many vehicle owners.

General information

The idea of creating an alternative to gasoline engines was born a long time ago. Design research and many years of research resulted in the birth of the QD32 diesel 4-cylinder engine, the technical characteristics of which were immediately noted by connoisseurs of safe driving.

Interesting fact! UAZ owners often resort to replacing their native ZMZ-514 with the brainchild of an imported car industry.

The QD31 was first introduced by the Japanese in the 90s of the last century, acting as a worthy replacement for TD engines. Restyling of the devicefollowed in 2000. It was a sensation, because over the long history of the brand, a volume of 32 deciliters was the prerogative of only exclusive ICE variants.

The key difference from previous and competitive products is the absence of a Common Rail injection system, despite the fact that the QD32 engine, whose technical characteristics were only pleasing, was not included in the basic package due to the simplicity of the device and the ability to repair a failed device DIY.

The unit is distinguished by long-term and impeccable service, which has received the nickname "indestructible" among the people for this. Tuning is also a pleasure to perform.

Technical priorities

Reviewing the technical specifications of the QD32 engine, it can be noted that two types of lubricating fluid are required for normal operation. In winter, the potential is unlocked thanks to synthetic oil. In summer, he prefers semi-synthetics. For a hundred kilometers, the driver takes 10 liters. The timing drive in the structure is mechanical. The high pressure fuel pump control system determines the power developed. The injection pump can be mechanical or electronic. In the first case, according to reviews, the engines are more reliable, having 135 hp. With. on electronic control.

Design nuances

To the design features of the Nissan QD32 engine, the technical characteristics of which are thought out by technologists to the smallest detail, you caninclude the following:

1. The manufacturer made the cylinder head using cast iron as the base material.
2. Cast iron block does not use liners.
3. Using a timing gear drive that requires virtually no replacement.
4. Basic version of the vortex-type aspirator.

Features include a lubrication system with forced oil supply. The advantage of attachments is a long service life.

Why did the developers prefer cast iron, because it makes the assembly heavier and aluminum was much lighter? In most cases, the casting is made from alloyed cast iron. The material is characterized as the most durable, having a low coefficient of friction between the materials of the piston rings and the pistons themselves. Cast iron walls have a high percentage of reliability, withstand heavy loads, and are more wear-resistant.

Pros and cons

The obvious positive qualities include the following:

• Judging by the feedback on the technical characteristics of the QD32 engine, the OHV gas distribution scheme does not allow breaks in the belt chain.
• The design of the motor is compact and simple.
• The manufacturer endowed the Nissan QD32 engine with a considerable resource, affordable cost.
• Good maintainability properties.
• Gear gear prevents pistons and cylinders from colliding.

Flaws

Cons include:

1. Some power limitations.
2. A certain percentage of noise and inertia.
3. Missing four-valve cylinders.
4. Cannot apply latest intake and exhaust tracts.

Due to its availability, this unpretentious knot is used in various modifications.

Where was the QD32 used?

Mainly aspirated was a regular participant in the products of the Japanese automaker, as well as in one model of the Datsun Truck collection. He was loved for the simplicity of design, a satisfactory motor resource compared to turbines. Before the first overhaul, the owner of a steel horse can be calm, traveling for 500 thousand km. Turbocharged units have to be repaired after the turn of 250 thousand kilometers.

One of the worthy features is an undemanding attitude to the quality of fuel: it is not forbidden to accidentally pour low-grade gasoline or solarium. They are less loaded compared to internal combustion engines on mechanical superchargers and turbocompressor units. There is no urgent need for expensive repairs, and the price list for spare parts will please. Suffer, of course, power, dynamics during acceleration.

It was used in Caravan minivans produced until 2002, in Atlas trucks until 2007. The good performance of the QD32 engine motivated engineers to introduce a turbocharged version in the Elgrand minivan, Regulus rear-wheel drive crossovers, Terrano SUVs.

Tuning Secrets

Before changing the native motor, a motoristit is important to ask if the service station has permission for such events. This is necessary to avoid problems with the registration procedure after tuning. The task of a qualified welder at the preliminary stage is to correctly install the cardan relative to the pallet. The next step is to reinstall the turbine volute and install the air ducts. You will definitely need to monitor the condition of the high-pressure fuel pump, candles, seals. Also check the intake manifold.

In setting up the injection pump, you need to focus on the position of the gears. If necessary, several teeth can be moved. In order for the characteristics of the Nissan QD32 engine to comply with the standards, the suspension must be slightly raised during installation. Then the electrical equipment, fuel, water, air lines are connected. Be sure to check the functionality of all systems.

What is the result?

The machine with the updated power unit overcomes steep hills easier in high gears, promotes smooth movement on the highway or in urban conditions. In this case, the diesel does not overheat. Sometimes malfunctions do occur.

About common problems

The collection of problems contains:

• sudden engine shutdown, erratic operation above 2,000 rpm;
• exhaust turns blue;
• rpm instability observed.

Beforerepair, you should study the full specification of the QD32 Nissan Caravan engine or another model. A good diagnosis is required. In an unstable state of speed, you will have to look for reasons in the electric control of the high-pressure fuel pump. It is highly likely to be replaced. A similar procedure awaits if problems are detected with the fuel cut-off valve. If the fuel unit is clogged, the master will clean it, and in a situation with incorrect operation of the injectors, they will replace them.

Self-diagnosis and its basics

For independent diagnostic procedures, you must first find a special connector located under the steering column. The starter is driven to the ON position, the engine does not need to be started. A paper clip closes pins 8 and 9 in this connector. The jump occurs for a couple of seconds. Next, the paper clip must be pulled out, while the motorist will notice the signal of the check lamp. Long and short blinks should be counted. How to understand that there are no faults? This is evidenced by the code "55" - this is 10 blinks, half of which are long.

Principles of repair work

Repair involves disassembling the engine, cleaning it from oil and dirt. It is difficult to see the defect without getting rid of soot. Specialists will check whether the geometry of parts subject to friction is not broken, measure the gaps. If cracks are found on the block, crankshaft troubleshooting is indispensable.

How is a cylinder block troubleshooting done? In this area, its processing, boring, changing rings are implied. It would be beneficial to changeoil pump, water pump and gas distribution mechanism. The choice of repair operations is dictated by the condition of spare parts and mechanisms. Without knowledge, skills, measuring equipment, it will not be possible to carry out high-quality repairs.

Preventive measures to avoid breakdowns

Obviously, the careful operation of the “swallow” will help you avoid visiting car service shops for a long time. Timely maintenance will help to avoid difficult situations on the road. The manufacturer suggests that car owners change the fuel filter every 40,000 km. It is recommended to adjust the thermal clearances of the valves, reaching the mark of 30 thousand km. Of particular importance is the replacement of the oil fluid, carried out on time. It is better to do this after 7.5 thousand km. At least twice a year, the ventilation should be optimally cleaned. After twenty thousand kilometers, you need to change air filters, glow plugs. It is not superfluous to update the antifreeze.