Blowby Flow Sensor 3867561 – Crankcase Ventilation Sensor for Compatible Diesel Engines
The 3867561 is a blowby flow sensor for compatible diesel engine assemblies. This blowby flow sensor measures the rate of crankcase gas leakage. Specifically, it monitors blowby gas that bypasses the piston rings during combustion. Diesel engine parts catalogs list it as a blowby flow sensor. The 3867561 ships as an electronic replacement for engine protection and diagnostics.
🔩 Specifications
- Part Number: 3867561
- Part Name: Blowby Flow Sensor
- Component Type: Electronic Sensor (Crankcase Ventilation System)
- Application: Compatible ISB/QSB and K-series diesel engine assemblies
- Function: Measures crankcase blowby gas flow rate and sends data to the engine control unit
- Service Type: Emissions and crankcase ventilation system service, sensor replacement
- Application Range: Heavy-duty trucks, excavators, construction equipment, marine power, and generator sets
⭐ Key Features
- The 3867561 blowby flow sensor installs in the crankcase ventilation line.
- It measures the volume of gas that leaks past the piston rings into the crankcase.
- Consequently, the blowby flow sensor provides real-time data on piston ring condition.
- The engine control unit uses this data to flag abnormal blowby levels.
- Furthermore, the sensor triggers warnings when ring wear or ventilation blockage occurs.
- It helps prevent unplanned downtime by catching seal degradation early.
- Moreover, the blowby flow sensor supports emissions compliance and engine protection.
- Replacing a failed sensor restores accurate crankcase ventilation monitoring.
- In addition, a working sensor prevents false engine fault codes and limp mode events.
⚙️ Technical Insights
The blowby flow sensor sits in the crankcase ventilation hose. It measures the gas flow coming out of the crankcase during engine operation. The engine control unit compares this flow to expected values.Healthy engines produce a small amount of blowby through normal ring clearance. High blowby flow signals worn rings, stuck rings, or a blocked ventilation system. The sensor converts this flow into an electrical signal for the ECU.However, the sensor itself can drift, clog, or fail over time. A failed blowby flow sensor may report zero flow or an impossible reading. As a result, the ECU logs a fault code and may trigger a warning light on the dashboard.
Fitting a fresh 3867561 blowby flow sensor restores accurate crankcase gas measurement. It also returns reliable input to the engine protection system. Therefore, the ECU monitors ring health correctly and avoids spurious warnings.
🛠 Application Scenarios
The 3867561 blowby flow sensor suits compatible diesel engines in heavy-duty on-highway trucks. It also fits excavators and construction equipment. Furthermore, it serves marine power units and stationary generator sets.Technicians typically install it when the original sensor fails or drifts out of spec. They also fit it after crankcase ventilation system service. Moreover, they replace it when diagnostics point to a faulty blowby reading.
For best results, inspect the ventilation hose for blockage while the sensor is off. Check electrical connectors and wiring harness continuity during installation. This step ensures the sensor reads correctly and sends reliable data to the ECU.
📦 Availability
For exact fitment, please provide your Engine Serial Number (ESN). Our customer support team is always ready to help. We will ensure you receive the correct 3867561 blowby flow sensor for your engine configuration.
