Shire 20 Workboat Inboard Diesel Engine PRM60 Package

Description

Satisfy commercial inland waterway standards with Shire 20 Workboat Inboard Diesel Engine packages engineered for commercial canal pushers and maintenance barges. The naturally aspirated three-cylinder block outputs 20 brake horsepower at 3,000 RPM across a 1.0-liter displacement envelope. Direct mechanical fuel injection meters diesel without complex electronics, powering work punts, river workboats, and small harbor tenders.

Monolithic gray cast iron forms the rigid three-cylinder block, incorporating parent-bore induction hardened walls that resist wear under sustained commercial dragging. A skin-tank cooling circuit circulates jacket coolant through 1.125-inch hose connections without raw seawater impellers. Package utilities include a matched adapter plate for the PRM60 gearbox, four-quart wet oil pan, number six JIC fuel connections, and an unladen dry mass of 280 lbs including gearbox.

Key Features of Shire 20

Fleet maintenance managers buy Shire 20 inboard engine units to power commercial canal tenders that require rugged mechanical propulsion. This three-cylinder package pairs smooth power strokes with a mechanical PRM60 transmission to provide dependable service in weeded inland waterways.

• 1.0-liter displacement generates 42 lb-ft torque at 1,800 RPM to swing heavy workboat wheels.
• PRM60 mechanical gearbox provides positive forward and reverse engagement with zero hydraulic loss.
• Skin tank keel-cooling loop avoids raw water pump impeller failures in muddy waterways.
• Three-cylinder inline layout provides uniform firing intervals to lower engine room vibration.
• Shire 20 workboat inboard diesel layout features top-access fuel filters to keep bilge bilges clean.
• 12-volt 50-amp marine alternator maintains charge across starter and equipment battery banks.
• Heavy flywheel rim stabilizes idle rotation when pushing heavy maintenance barges through locks.

Torque Characteristics Thermal Profiles

Internal coolant temperatures stabilize between 165°F and 185°F under continuous inland commercial duty cycles. Mechanical injectors spray fuel at 200 bar straight into precombustion chambers, promoting complete fuel atomization and minimal exhaust odor. The closed cooling circuit transfers 850 BTU per minute of heat energy to exterior hull skin tanks under continuous pushing loads. Cruising fuel consumption measures 0.410 lbs per horsepower hour at 2,200 RPM, burning approximate 0.6 GPH when maneuvering work barges through canal networks.

Stringer Mounting Exhaust Layout

Exhaust installation adheres to ABYC P-1 standards using a 2.5-inch dry exhaust riser insulated with high-temperature thermal blankets. Foundation stringers require 18.0-inch width spacing with 2.0 inches of clearance below the stamped steel oil pan. Heavy elastomer shear mounts absorb rotational engine pulses while locking propeller shaft coupling alignment.

Maintenance Protocols Operating Constraints

Mechanical push-pull cables actuate the speed governor arm and gearbox lever with direct tactile response. Technicians check engine oil and gearbox fluid with dedicated dipsticks before starting cold engines. This commercial propulsion unit is not engineered for light planing skiffs, high speed racing craft, or raw unseparated bilge sludge operation.

• Check crankcase oil level and PRM60 gearbox fluid each shift before starting.
• Replace primary fuel spin-on filter canisters and clean water traps every 250 hours.
• Drain crankcase engine oil and install fresh lube filter cartridges every 500 hours.

Warranty Manifest Crate Contents

Barrus Shire protects this propulsion package with a 2-Year commercial warranty covering structural castings, moving components, and the PRM60 transmission. The shipping crate contains the engine block, PRM60 gearbox, four flexible vibration mounts, 12-volt control panel, wiring loom, and an OEM technical operation manual.