搜索历史清除全部记录
- All
- Product Management
- News
- Introduction
- Enterprise outlets
- FAQ
- Enterprise Video
- Enterprise Atlas
How to Handle a Clogged Wet Spray Machine Engine Crankcase Vent Valve
Release time:
2025-11-19
Source:
Author:
Summary:
Guidance on Handling Clogged PCV Valves in Wet Spray Machine Engine Crankcases
I. The Function of the PCV Valve and Its Clogging Symptoms
1. Main functions: Balance crankcase pressure and vent blow-by gases; prevent oil contamination and moisture buildup.
2. Clogging symptoms: Unstable engine idling or stalling; oil leakage around the oil filler cap/oil dipstick area; severe oil buildup in the intake manifold; noticeable foul exhaust odor (burned oil smell).
II. Analysis of Blockage Causes
1. Oil quality issues: Prolonged use of low-quality oil leads to varnish buildup; failure to change the oil on schedule (recommended every 250 hours).
2. Poor engine operating conditions: Piston ring wear leading to excessive blow-by; turbocharger seal failure (common in boosted models).
3. Environmental Factors: High-humidity environments lead to condensation, causing oil emulsification; prolonged operation under low load results in insufficient crankcase gas temperatures.
III. Diagnostic Methods
1. Preliminary Check: Remove the PCV valve and gently shake it, listening for any signs of sticking in the valve core (it should produce a crisp, clear sound under normal conditions); also inspect the connecting hoses for cracks or deformations.
2. Pressure Test: With the engine running, open the oil filler cap. If you notice significant suction or air喷ing out, it indicates that the valve body is blocked.
3. Advanced Inspection: Measure crankcase pressure (normal range: -5 to -15 mbar); use an endoscope to inspect the interior of the valve cover for oil sludge buildup.
4. Processing Procedure
1. Mild Clog Cleaning: Soak the valve body in carburetor cleaner for 30 minutes; blow through with compressed air (pressure ≤3 bar); after reassembly, test idle stability.
2. Severe Blockage Replacement: Choose an OEM PCV valve of the same model (pay attention to the pressure specifications); simultaneously replace the ventilation lines (silicone material is recommended).
3. System Deep Maintenance: Clean the oil sludge inside the valve cover; replace with high-performance synthetic engine oil (e.g., 5W-40 C3 grade); inspect the turbocharger for sealing integrity (for models equipped with a turbocharger).
V. Preventive Measures
1. Regular maintenance: Inspect the PCV valve condition every 500 hours; clean the entire ventilation system every 1,000 hours.
2. Operating guidelines: Avoid prolonged operation at low RPM; after starting a cold engine, allow it to idle and warm up for 3 minutes.
3. Accessory Selection: Use an improved PCV valve with oil-water separation function (suitable for high-humidity environments).
6. Emergency Response Plan
1. Temporary Emergency Measure: Temporarily operate the PCV valve without it (requires keeping the oil filler cap open); this should not exceed 2 hours.
2. Risk Warning
Forced operation may lead to: crankshaft oil seal leakage; intake system contamination.
7. Post-Repair Verification
1. Performance Testing: Observe idle speed fluctuations (should be < ±20 rpm); check oil consumption (consumption ≤ 0.5 L after 500 hours).
2. Emission Testing: The HC level in exhaust gases should be below 100 ppm.
RELATED INFORMATION
Contact Us
Changsha Base:Hunan Zenxon Heavy Industry Technology Co., Ltd.
Address: Jinrong Tongxin International Industrial Park, Changsha High-tech Zone
Loudi Base:Hunan Haoda Heavy Industry Technology Co., Ltd.
Address: Loudi Avenue, Loudi High-tech Industrial Development Zone, Lianyuan City, Loudi City, Hunan Province
Telephone:400-186-0868
E-mail:3804246750@qq.com
E-mail:19967177733@163.com
0
Consult now
WeChat Public Number
TikTok