SINOTRUK Urea Dosing Nozzle AZ932555200008/1 with Urea Level & Temperature Sensor (China V SCR Set)

## What this set covers

This is the dosing side of the China V air-assisted SCR system on SINOTRUK trucks, supplied as one matched set:

– **Urea dosing nozzle AZ932555200008/1** — the injector that sprays DEF into the mixer ahead of the SCR canister.
– **Urea level and temperature sensor** — the flange-mounted probe that reads tank level and DEF temperature and feeds it back to the DCU.

Both parts come off the same non-heated China V system (`国五非加热`), so they are matched to each other. If you are replacing one because of a dosing fault, check the other at the same time: a sensor reading that drifts will make a healthy nozzle look faulty, and vice versa.

## Nameplate data — use this to match your old part

The stainless plate on the nozzle body reads:

| Line | Value |
|—|—|
| Barcode line | 4500329832250508000800 |
| Part number | **AZ932555200008/1** |
| Second number | 187110 |
| Fourth line | PV550040 / CNHTC (SINOTRUK triangle mark) |

Give us any one of those four lines and we can confirm you are getting the right part.

## The nozzle

– Two stainless tubes on top are **coolant in and coolant out** — not air lines. If they are blocked or the coolant does not circulate, the nozzle tip cooks within a few thousand kilometres.
– Brass port with a locking clip is the **DEF inlet** (VOSS style). Push the line in until the clip clicks; a half-seated clip is the most common cause of an external urea leak.
– The electrical connector is the dosing solenoid. Check the pins for green corrosion before you fit a new nozzle — a corroded pin will burn out the new unit’s coil.

## The sensor

– Flange mounts into the tank with the probe hanging down into the DEF.
– Probes carry a float and a bottom filter; the heated version has a twin quick-connect pair on the flange for engine coolant.
– Signal feeds the DCU, which is what actually triggers the level warning and the torque derate.

**Four things to compare against your old sensor before ordering:**

1. Flange diameter and bolt pattern
2. Probe length, tip to flange face
3. Angle between the two coolant ports (heated versions differ)
4. Plug keyway and pin count

Send a photo with a ruler across the flange and we will match it for you.

## Failure symptoms worth knowing

| Symptom | Usually means |
|—|—|
| White crystal crust around the nozzle tip | DEF leaking past a worn seat, or a cold engine run on short trips |
| Urea pressure reading above 3 bar | Blocked nozzle or a kinked return line |
| Spray cone collapses into a solid stream | Carbonised tip — clean first, replace second |
| Level gauge jumps or drops to zero | Sensor float sticking or a failed sender |
| DEF lamp plus torque derate | DCU has logged a dosing fault — read the fault code before swapping parts |

## Clean before you replace

1. Soak the tip in water above 80 °C for 15 minutes — never use a wire brush or abrasive.
2. Blow dry with clean air at 0.4 MPa or more.
3. For a hard blockage, pass a cleaning needle through the tip gently. Do not drill it out; the orifice size sets the dose.
4. Refit at **60 N·m** on the flange bolts and **1.2 N·m** on the small union. Over-torquing the union cracks the seat.

## Heated or non-heated? How to tell your version

The same tank position can take two sensor versions, and they are not interchangeable:

– **Non-heated** — the flange has no coolant ports; the probe carries just the float and a bottom filter.
– **Heated** — two quick-connect ports on the flange feed engine coolant through a U-tube inside the probe, keeping the DEF around the sender from freezing.

Check the pump side the same way: a heated pump has a coolant water valve and a relay inside the box; the non-heated box has neither. Send a photo of the flange end and we will confirm which version your tank takes before you order.

## Fits

SINOTRUK HOWO T5G / T7H / A7, Sitrak C7H, and other China V (Euro V) trucks running the air-assisted SCR system. Works with DCU `AZ1034121020` and urea pump `WG1034131181/1`.

## Matching parts on this site

– Aftertreatment DCU AZ1034121020 — the control unit that drives both parts above.
– Urea pump WG1034131181/1 — the air-assisted pump that feeds the nozzle.

Send your VIN or a photo of the old part and we will confirm the match before shipping.