M601-B & M601-D OVERHAUL

Expired Walter GE M601-B's and M601-D's are available for a low acquisition cost; in some parts, they are abundant - but not for without reason.  The cost to replenish a TBO on these turboprop engines is substantial and often makes no sense economically.

However, if you're building an experimental turboprop aircraft and are looking for a sensibly priced engine with at least an 750hr TBO, then read on.


With the help of our partners and their original tooling, specialist knowledge and decades of experience, we can help reduce the total cost of overhaul and unecessary parts replacement.

To achieve this, engine diagnostic capabilities measure, gauge, compare and test and as a result are able to reduce cost per overhaul whilst keeping to the highest quality and turn-around-time as promised.


  • Engine disassembly / assembly services
  • Parts & accessory / ancillary repair
  • Engine component inspection and testing
  • APU overhaul
  • Hydraulic lock repair
  • Engine modifications
  • Engineering support
  • Engine bench testing
  • Documentation

We can overhaul many of the accessories found on most radial engines in service today.  Our component library, mandatory part replacement database, functional test limits and our stringent inspection procedures ensure that product integrity remains optimal.


  • Starters
  • Generators
  • Sync breakers / generators
  • Relays
  • Regulators
  • Actuators
  • Motors


  • Fuel pumps
  • Boost pumps
  • ADI regulators
  • Fuel switches
  • Drain valves
  • Feed valves
  • Selector valves
  • Heater cans
  • Igniters


  • Actuators
  • Pumps
  • Cylinders
  • Regulators
  • Accumulators


  • Regulators
  • Pressure switches
  • Selector valves
  • Pumps
  • Pressure valves
  • Thermostats
  • Screen assembly
  • Relief valves
  • Actuators

We overhaul and repair a broad range of fuel system, ignition, and rotor accessories. We have been supplying accessories to civilian and military organizations around the world for over 20yrs. Our services are conducted and inspected by specialized technicians using the highest standard of calibrated tools, equipment and machinery.

We either stock or can source the following types of engines and can offer them in used, overhauled/0-timed or part-exchange condition -

  • Ivchenko AI-14RA 9-cylinder radial piston engine (260hp)
  • Vedeneyev M-14B 9 Cylinder Radial Engine (300hp)
  • Vedeneyev M-14P 9-Cylinder Radial Engine (360hp)
  • Walter M601-B Turboprop Engine (760hp)
  • Shvetsov ASh-62IR 9 Cylinder Radial Engine (1,000hp)

Enquiries are frequently about repurposing these engines, we are asked to supply items for museums, universities, experimental aircraft and many for non-flying applications e.g. hovercraft. 

Ivchenko AI-14RA 9-cylinder radial piston engine (260hp)

The Ivchenko AI-14 is a 9-cylinder, air-cooled, radial piston engine designed in the Soviet Union.  Its main variant is the AI-14R, which underwent state trials in 1950 and was used in many types of light aircraft.  Several thousand were built.

A licensed version of the AI-14R, (currently AI-14RA), has been produced by WSK-Kalisz in Poland from 1956 until 2007.  

The AI-14RF was a variant uprated by Ivan Vedeneyev to 300 hp. Its further development is the Vedeneyev M-14P family of engines. 

We currently have limited AI-14RF engines available

Vedeneyev M-14B 9 Cylinder Radial Engine (300hp)

Typically for the Yak-12/12M or can be mounted on the PZL-104 Wilga providing excellent all round performance.

It is largely the same as the M-14P except it delivers less horsepower, is more economical, has a different carburettor and a fixed, as opposed to variable pitch propeller.  This can delivers many operational benefits compared to the AI-14 and M-14P's.

This engine can also be supplied with or without an alloy AV-14 3-blade fixed pitch propeller.

We currently have several M-14B engines with V530 (3m) and AV-14 propellers available 

Vedeneyev M-14P 9-Cylinder Radial Engine (360hp)

Many Yakovlev aircraft types have the M-14P powerplant fitted e.g. Yak 50's, 52's, 18T's, 55M's.

It is an excellent engine, originally designed in Ukraine with renowned robustness and reliability.  It offers excellent power to weight ratio & delivers an impressive vocal tone.  

Although the standard M-14P/V530TA-D35 combination is quite sufficient, some owner prefer to upgrade to an M-14PF with 3-blade MTV-9 propeller for that little bit of extra performance in reserve for improved cruise, climb and STOL performance.

We currently have a limited stock of M-14P engines.

Walter M601 Turboprop Engine

After a significant research period, Vertical identified the M601 range of turboprop engines as the ideal powerplant to power its new aircraft 6-seat T-1 aircraft.

The light weight to high power ratio provides sufficient power to lift 6-people comfortably away from grass fields and lakes and achieve a cruise of circa. 320 km/h.

The powerplant is well established and is often found fitted to, amongst many others, the L410 aircraft.  Modern equivalents include the renowned Pratt & Whitney PT6.

We currently hold M601-B stock only

Shvetsov ASh-62IR 9 Cylinder Radial Engine (1,000hp)

The Shvetsov ASh-62 is a nine-cylinder, air-cooled, radial aircraft engine produced in the Soviet Union and often found mounted on the Antonov An-2 range of aircraft.

Over 40,000 of these engines were built, many of which are still in operation today.

The ASh-62 was a development of the Wright R-1820 Cyclone that had been built in Russia under licence as the Shvetsov M-25, the main improvements including a two-speed supercharger and a more efficient induction system.

We currently hold a small stock of ASh-62 engines

Suite 22, 5 Bridge Street
Maidenhead, Berkshire, SL6 1JN
United Kingdom

Enquiries:  +44 208 895 6852 (24hrs)
Office hours: 09:00-18:00 GMT, Monday - Friday

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