The engine in the JCB 804
Fitment for the JCB 804 centres on the Perkins 403D15: 1.5L / 91 cu in, 3-cyl inline, 79 x 100 mm bore x stroke, about @ 3000 rpm, Tier 3 & 4. Serial number on the block settles the exact version. New-surplus and rebuilt stock ships from Houston.