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Inspect and replace during major overhaul every 8000–10000 operating hours under normal working conditions.
Common issues
Valve head ablation, wear, carbon buildup, valve stem scoring and sealing failure, which result in insufficient power, abnormal exhaust smoke and increased fuel consumption.
Inspect and replace during major overhaul every 8000–10000 operating hours under normal working conditions.
Common issues
Valve head ablation, wear, carbon buildup, valve stem scoring and sealing failure, which result in insufficient power, abnormal exhaust smoke and increased fuel consumption.
12300235 is a dedicated exhaust valve for DEUTZ MWM 620 series engines. It is an essential component of the valve train and fits TBG620 V16(6002) gas engine.
1. Basic Information
Part Number: 12300235 (OEM original part)
Type: Exhaust Valve
Applicable Models: MWM TBG620 V12/V16/V20 and TBD620 series gas & diesel engines
Material: High-temperature and corrosion resistant alloy valve steel. The valve head and stem are surface reinforced to deliver outstanding resistance against high-temperature ablation and wear.
Structure: Integral forging with precision ground valve stem
Original Reference Price (2026): Approximately €45–51 per piece (exclusive of tax)
Related Parts:
12300234: Intake Valve
Valve seat insert, valve guide, valve spring and valve stem seal (matching components)
2. Functions & Features
It controls the exhaust stroke of the cylinder. It opens to discharge burnt exhaust gas and closes to seal the combustion chamber. The component withstands sustained ultra-high temperature and high-pressure gas impact, ideal for long-term continuous operation of the unit.
3. Common Failures & Replacement
Common issues: Valve head ablation, wear, carbon buildup, valve stem scoring and sealing failure, which result in insufficient power, abnormal exhaust smoke and increased fuel consumption.
Replacement Interval: Inspect and replace during major overhaul every 8000–10000 operating hours under normal working conditions.
4. Installation Instructions
Thoroughly clean carbon deposits and debris on valves, valve seats and guides before installation.
Check valve clearance. Standard exhaust valve clearance: 0.35–0.40 mm.
Ensure the valve is fully seated with reliable sealing and no air leakage.
Apply special lubricant during assembly to prevent valve stem sticking.
