TRW Engine 3911 Engine Exhaust Valve

TRW Engine Exhaust Valve 3911 Overview

TRW Engine 3911 is an engine exhaust valve for select Volkswagen Vanagon applications from 1984-1991. It is built with a 122.6 mm overall length, an 8.9 mm valve stem diameter, and a 34 mm valve head diameter for the specified 45° valve seat angle.

For buyers searching for a Volkswagen Vanagon exhaust valve, part number 3911 provides the key dimensions needed for valve train service and cylinder head repair. The bi-metal valve seat material, chromed valve stem, armoured valve seat, and hardened valve stem tip support consistent valve operation in the exhaust side of the engine.

Key Features

• Engine exhaust valve for valve train service
• Part number 3911
• 122.6 mm length
• 34 mm valve head diameter
• 8.9 mm valve stem diameter
• 45° valve seat angle
• Bi-metal valve seat material
• Chromed valve stem with hardened valve stem tip
• Armoured valve seat construction

Detailed Description

TRW Engine 3911 is specified as an exhaust valve for Volkswagen Vanagon models from 1984 through 1991. The dimensional profile is important for proper cylinder head service, including the 122.6 mm length, 34 mm head diameter, and 8.9 mm stem diameter. The 45° seat angle and bi-metal seat material align with the listed application requirements, while the chromed stem and hardened tip add wear-focused construction details for exhaust valve duty.

This part cross-references OE-style part numbers 025 109 612 A and 0311OSVAT for the same application. If you are sourcing a Volkswagen Vanagon exhaust valve or replacing a worn valve in a 1984-1991 Vanagon cylinder head, TRW Engine 3911 is the cataloged part number to verify against your engine specifications.

What It Is Used For

• Replacing a worn or damaged exhaust valve in the cylinder head
• Restoring valve sealing performance in Volkswagen Vanagon engines
• Addressing exhaust valve wear, pitting, or stem damage
• Supporting proper compression and combustion chamber sealing
• Servicing valve train components during engine rebuild work

Installation Notes and Tips

Confirm the valve head diameter, stem diameter, overall length, and seat angle against the original component before installation. For Volkswagen Vanagon applications, verify cylinder head condition, valve guide wear, and seat condition during service so the new exhaust valve can seat correctly. Professional cylinder head machining and valve lapping procedures should follow standard engine rebuild practices.

Quality Assurance

TRW Engine valve train components are cataloged to meet the dimensional and material requirements listed for the application. Verify part number 3911 against your engine build data and original valve specifications before assembly.