Caterpillar 3406B & 3406C Parts

Parts for the Caterpillar 3406B and 3406C — the inline-six workhorses that ran fleets through the mechanical era and into Cat's first electronic engine controls. These engines are simple, durable, and still on the road, but many original part numbers have been superseded over the years. That's where we help. JAK'S Diesel stocks PAI Industries aftermarket components and our own JAK'S Diesel Heads cylinder heads for this platform: heads, injectors, turbochargers, gaskets, and full rebuild kits.

Have an old CAT number that no longer crosses clean? Send it over. We'll match the current replacement and confirm fitment before you buy. Same-day shipping from Colorado; free freight over $1,000.