LPA Series Shaftdrive 315mhp

Power Boat Engines

Yanmar LPA(2) Series Marine Diesel Engine (315mhp)

The turbocharged, overhead-cam 6LPA-STP2 is incredibly compact and light in weight, considering their high power output and thorough ruggedness.  the waste-gated, water-cooled turbo really makes things happen when the throttle is pushed down.  There are four valves for each of the six cylinders, allowing enhanced breathing and boosting top-end performance. Enjoy smooth shifting, instant response and abundant torque throughout your engine’s operating range.

  • Turbocharged, intercooled, waste-gated
  • Big breathing four-valve head
  • Going faster on less fuel

Engine Model

  • 6LPA-STP2  315 mhp @ 3800rpm

Gear Option

  • KMH50A (Down Angle 8°°)  Ratio  2.13 / 2.43
  • KMH50V (V Drive 12°)  Ratio 1.58 / 2.08 / 2.47

Light in weight, small in size, high power outputs

This engine contains many high performance features sure to appeal to the serious motorboater. The overhead cam design develops max hp at higher revs, allowing smaller, smoother running propellers. The engine features 4 valves per cylinder for enhanced breathing and top end performance.

Better fuel and air management

A waste-gated, water-cooled turbo really makes things happen when the throttle is put down hard. To reduce embarrassing black smoke at these times, the 6LPA(2) engine has a boost-compensated distributor-type fuel pump, and burn efficiency has been improved as well.

Reduced vibration and noise

Two stage springs in fuel injectors reduce injection noise. Ladder-frame, full block-width crankshaft bearing cap structure reduces lower block area distortion and fights bearing slap, and of course belt drive makes for big cuts in timing gear noise, while the 12 balance-weight crankshaft and rubber engine mounts soak up much of the usual diesel vibration.


Ordering the STP2 engine gets you a “go fast package” of bigger oil cooler, gallery cooled pistons and big breathing 4-valve head. Engines can be ordered with optional instrument panels B, C, or D. Panel B mounts the usual tachometer and vital sensors for battery, temperature and oil, but in addition has sensors for, i) fuel/water separator water level. ii) seawater flow at intercooler, and iii) waste-gate valve blockage (boost pressure) Panel C and D offer more sensors again, namely for, iv) heat exchanger fresh water level. The aim is to go faster on less fuel, while at the same time keeping a far better eye on all those vital engine health functions.



  • Flexible engine mount, 4 pcs/set
  • Engine foot for marine gear (ZF-Hurth ZF63A1 & H1, ZF45A2 & H2)
  • Damper disc for marine gear (ZF-Hurth ZF63A1 & H1, ZF45A2 & H2)
  • Exhaust water mixing elbow

Cooling System

  • Air venting device for cooling water tank (for V-drive)

Starting and Stopping

  • Electric engine stop solenoid

Electrical and Instrumentation

  • Alternator, 12V-80A
  • New D-type instrument panel
  • Alarm switch and meter sensor assy
  • Meter sensor assy for New B & C-type panel
  • Extension wireharness (6m)



  • Exhaust water mixing elbow, Riser type


  • Kingston cock


  • Lube oil evacuation pump, rotary type
  • Lube oil dipstick for opposite side of engine

Starting and Stopping

  • Cold starting aid (Glow plug type)

Electrical and Instrumentation

  • Electric type bilge pump, 12V
  • New B-type instrument panel
  • New C-type instrument panel
  • VDO alarm switch and meter sensor assy
  • Meter sensor assy for dual instrument panel
    (New C+C or C+D type)
  • Connecting wireharness for dual instrument panel


  • Side-mount type single control head (MORSE:MV)
  • Top-mount type single control head (MORSE:MT3)


  • Onboard tool kit