CATERPILLAR EXCAVATORS:
• Caterpillar 320D/320DL C6.6 6.6L Diesel (2007-2012)
CATERPILLAR WHEEL LOADERS:
• Caterpillar 938H C6.6 6.6L Diesel (2007-2012)
IMPORTANT:
Cat 277-5063 is a rocker cover gasket for the Cat C6.6 (Perkins 1106D-E66TA) engine — specifically the earlier 2007-2012 production. Perkins equivalent is 3681A059. Do NOT confuse with Cat 309-6664 (Perkins 3681A065) which is the rocker cover gasket for later production of the same engine family. The gasket shape and bolt hole positions differ between early and late production — they are NOT interchangeable.
Failure symptoms: oil weeping from the rocker cover area, oil pooling on the exhaust manifold, burning oil smell from the engine compartment. The rubber gasket hardens over time from heat cycling. When replacing, inspect the cover for warping and clean both mating surfaces. Also check the rocker cover bolt grommets — worn grommets prevent proper sealing pressure. Cat C6.6 = Perkins 1106D-E66TA — Cat and Perkins part numbers are interchangeable.
⚠️ Cross-ref: Cat 277-5063 = Perkins 3681A059. Verify early (2007-2012) vs late production.
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