6HP19 2004-2006 BMW 525i 2.5L RWD – Remanufactured 6-Speed Automatic Trans

Description

Adapted for rear-wheel propulsion skiffs, ZF 6HP19 RWD Marine Transmission remanufactured units equip 2004-2006 BMW 525i 2.5L marine conversions. This 6-speed automatic drivetrain sustains 215 horsepower at a 6500 RPM input ceiling. Calibrated electro-hydraulic valves manage gear engagement with a 4.17:1 first gear reduction ratio to propel planing craft.

Heat-treated marine-grade aluminum casing parts encase the cluster to prevent structural distortion in demanding bilges. Ground AGMA Class 11 helical teeth maintain tooth contact without unwanted gear rattle. Sintered bronze friction plates feature directional fluid passages to shed thermal buildup during continuous runs. A cupronickel tube bundle heat exchanger with sacrificial zinc anode connects to 1.0-inch raw water lines. Control ports feature 7/16-20 JIC flare fittings. Dry weight totals 210 lbs holding 9.0 quarts capacity in an SAE #2 pattern.

Key Features of ZF 6HP19

Fleet operators elect to buy ZF 6HP19 marine transmission gearboxes to power lightweight aluminum tenders and river survey hulls. This modern remanufactured package replaces older transmissions to provide precise electronic shift timing across diverse vessel speeds.

• 290 PSI fluid pump circuits lock forward clutch friction plates under high engine load
• 6 computer-managed ratios deliver 4.17:1 break-out thrust down to 0.69:1 cruising overdrive
• 2.4 gallon per minute positive displacement pumps force fluid through transmission cooler passages
• 12-volt electronic solenoids command clutch modulation within 75 milliseconds for clean shift transitions
• 4.17:1 low gear reduction turns large diameter wheels for enhanced harbor station holding
• 240 lb-ft damper units isolate torsional vibration between diesel blocks and this 6HP19 marine transmission
• 4 bolt companion flanges link shaft flanges straight to inboard stern gear couplings

Inboard Drive Torque Parameters

Internal clutch line pressures regulate between 220 and 290 PSI pump pressure to eliminate internal slip under sudden acceleration. Sump fluid heat limits remain within 150°F to 185°F operating sump temperature throughout continuous commercial transits. Peak continuous input torque stands at 220 lb-ft at 4500 RPM under a medium duty rating. The cupronickel heat exchanger exhibits a thermal heat rejection rate of 580 BTU/min into raw water streams. A 4.17:1 low gear mechanical reduction ratio provides ample low-speed thrust to maneuver laden passenger launches.

Shaft Coupler Flange Fitment

The output companion flange exhibits a 4.75-inch outer diameter with a 3.875-inch pitch circle diameter across 4 precision bolt holes. Built-in thrust bearings endure up to 2,100 pounds of continuous shaft thrust from working wheels. Down-angle drop geometry measures 160 mm vertical center distance. Stern shaft coupling runout must not exceed 0.003 inches during dial gauge inspection.

Transmission Fluid Service Program

Computerized solenoid manifolds govern transmission shift points while an accessible dipstick enables fluid monitoring in cramped bilges. This gearbox is not engineered for deep-water offshore tugs or heavy displacement stern draggers. Systematic service sustains clutch plate friction life under continuous operation.

• Examine fluid tint and check fluid level at the dipstick indicator each shift before engine ignition
• Evacuate fluid and clean particulate matter from the suction screen every 250 hours of operation
• Replace protective sacrificial zinc rods inside the water cooler bundle every 12 months during haulout

Standard Warranty Shipment Inventory

This remanufactured package includes a 2-Year commercial limited warranty backing all rotating mechanical components. The reinforced wood shipping crate encloses one bare marine transmission unit, an input torsional flex plate, a seawater oil cooler bundle with mounting bracket, an output companion flange, an oil dipstick, and a factory workshop manual.