CATERPILLAR EXCAVATORS:
• Caterpillar 303.5E/304E/305E2 C3.3B/QSB3.3 3.3L Diesel (2012-2018)
CASE SKID STEERS:
• Case SR175/SR200/SR220/SV185/SV250/SV300 QSB3.3 3.3L Diesel (2012-2018)
IMPORTANT:
INTAKE valve for Cummins QSB3.3 engines (3.3L, 4-cylinder, common rail). The QSB3.3 is also known as B3.3 (later variants), and in Cat equipment it is branded as C3.3B. The Kubota V3307 is the base engine design. Verify the specific Cummins part number — valve specs can vary between mechanical (B3.3) and common rail (QSB3.3) versions. Requires 4 intake valves per engine. Do NOT confuse with exhaust valve 5309399 — intake valves have a larger head diameter.
Fits Cat 303.5E/304E/305E2 mini excavators (branded C3.3B), Case SR175-SV300 skid steers, and Kobelco SK55SRX — all equipped with the QSB3.3 common rail engine. When replacing, inspect valve guides for wear (wobble test) and valve seats for pitting or recession. Replace valve stem seals during any valve job — old seals cause oil consumption and blue exhaust smoke. Check spring free length and installed pressure against Cummins service manual specs. Adjust valve lash after reassembly.
⚠️ Intake only — for exhaust, order 5309399. Confirm QSB3.3 (common rail) engine.
Total Reviews (0)
Write the First Review!