MAN B&W L58/64 & L58/64CD Fuel Pump (IMO-1208)

MAN B&W L58/64 & L58/64CD Fuel Injection Pump (IMO-1208)

The MAN B&W L58/64 and L58/64CD fuel injection pump (Ref: IMO-1208) is a jerk-type, high-pressure unit designed specifically for the MAN 58/64 medium-speed, four-stroke marine diesel engine series. Engineered to handle continuous operation on Heavy Fuel Oil (HFO up to 700 cSt at 50°C), Marine Diesel Oil (MDO), and Low-Sulphur Marine Gas Oil (LSMGO), this pump guarantees precise fuel metering and atomization up to injection pressures of 1500 bar.

Technical Specifications: MAN B&W L58/64 Fuel Pump

Key Features

1. Optimized Helix Profile Plunger & Barrel: Machined to sub-micron tolerances, maintaining volumetric efficiency and zero internal slippage across extreme HFO thermal cycles.
2. Integrated Lube Oil Barrier & Fuel Siphon Block: Prevents fuel oil dilution into the engine camshaft housing while maintaining continuous lubrication on lower tappet guides.
3. VIT Mechanism Adaptability: Full integration with Variable Injection Timing control racks for load-dependent start-of-injection (SOI) optimization.
4. Constant-Pressure Retraction Delivery Valve: Built-in relief valve mechanism dampens line reflections, preventing secondary injections and nozzle cavitation.
5. Heavy-Duty Housing Casting: High-tensile nodular cast iron housing resistant to high-frequency pressure pulsations and thermal stress up to 150°C.

Compatible Engine Models

• MAN B&W In-line: 6L58/64, 7L58/64, 8L58/64, 9L58/64
• MAN B&W Compact Diesel (CD): 6L58/64CD, 7L58/64CD, 8L58/64CD, 9L58/64CD
• MAN B&W Vee-type: 12V58/64, 14V58/64, 16V58/64, 18V58/64

Part Number Cross References

• MPN: IMO-1208
• Alternate OEM References: 5864-1208-001, MAN-5864-FP, FP-58/64-CD-01

Marine Applications

• Main Propulsion: Container vessels, bulk carriers, crude/product tankers, and Ro-Pax ferries operating MAN 58/64 prime movers.
• Diesel-Electric Cruise Vessels: Multi-engine power plants requiring precise cylinder-to-cylinder fuel balance.
• Stationary Power Plants: Base-load HFO power generation installations equipped with 58/64 series engines.

Frequently Asked Questions

What causes fuel pump plunger sticking on the MAN 58/64 engine?

Plunger sticking is typically driven by rapid temperature changes during fuel changeover (causing thermal expansion mismatch), fuel contamination (catalytic fines eroding clearances), or fuel overheating which causes fuel cracking and lacquering on the plunger guide surfaces.

Can an L58/64 fuel pump be used interchangeably on an L58/64CD engine?

While the base design is identical, verify the plunger diameter, helix cut profile, and VIT rack interface against your engine’s specific build sheet. The Compact Diesel (CD) configuration often utilizes optimized injection timing profiles. Always cross-check the engine nameplate and IMO technical file before swapping.

What is the standard overhaul interval for this pump?

The standard recommended major overhaul interval is between 12,000 and 16,000 running hours on continuous HFO operation. However, running on low-lubricity LSMGO or high-cat-fine blends requires testing and visual inspection at 8,000-hour intervals.