A-31431641-AI Valve, IntakeOne New Aftermarket Replacement Intake Valve Fits Massey Ferguson Tractors with Perkins Engine This aftermarket intake valve is a direct replacement for the Perkins 4. 236 and 6. 354 series diesel engines found in Fits Massey Ferguson tractors and industrial construction equipment, as well as select Fits JCB and Fits Allis Chalmers machines. The intake valve seats in the cylinder head and controls airflow into the combustion chamber a critical engine