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Yanmar Gearbox

KBW20

Kanzaki reverse gear offered by Yanmar on the 4JH3E (as KBW20-1) with 2.17, 2.62 or 3.28:1 forward ratios.

The KBW20 is part of Kanzaki's KBW series, covered together with the KM3P, KM3A, KM4A, KBW21 and KMH4A in a 1998 service manual. Yanmar's 3JH3/4JH3 operation manual lists the KBW20-1 as one of the gear options for the 4JH3E, with forward ratios of 2.17, 2.62 and 3.28:1 and a 3.06:1 reverse.

Yanmar's parts catalogue lists both the KBW20 and KBW20-1. The closely related KBW21 was used on more powerful JH engines.

Sources

  1. 1. Operation Manual 3JH3(B)E, 3JH3(C)E, 4JH3(B)E, 4JH3(C)E — Yanmar
  2. 2. Yanmar Marine parts catalogue: Clutch, KBW Series — Yanmar Shop (Yanmar parts data)
  3. 3. Kanzaki Marine Gear Manuals (manual index) — Marine Diesel Basics

Specifications compiled from manufacturer sources.