Simpson & Co Limited 7220

The register lists 33 variants here rated from 28 to 55 kW at 2,000 to 2,250 rpm, three- to four-cylinder engines with a bore of 91 to 95 mm and a constant 127 mm stroke. Maximum torque ranges from 118 to 314 Nm at 1,000 to 1,600 rpm. Among emission tiers, Tier 4 (Final or Phase-in) dominates with 29 variants ahead of Interim Tier 4 with 4; the 37–56 kW power category strongly prevails with 31 variants, with only 2 engines in the 19–37 kW category. 31 of the 33 engines carry a turbocharger, 29 of them wastegate and 2 fixed-geometry.

Engines of this power class drive mainly agricultural equipment, pumps and small construction machinery in India; the concentration on the SJV326CR pattern points to a nearly unchanged production run over many years of a proven base three-cylinder engine, certified across several power stages.

When buying used, turbocharged variants call for a check of boost pressure and turbocharger condition, while all engines need the injection pump and crankshaft seals checked for tightness, along with oil consumption; since the stroke is a constant 127 mm across all variants, pistons and cylinder liners can usually be sourced across the range. Spare parts run through the Indian Simpson distribution network.