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Parsons marine gearboxes

Parsons gearboxes have been in widespread use since the 1920s. They are either manual, with a gear lever mounted on the box, or remotely operated. The remotely operated boxes are known as Marinomatic and are hydraulically assisted.

All the Parsons gearboxes have a direct drive "reverse gear" and many have a reduction gear on the back. They engage forward gear with an internal clutch. The meshed gears do not rotate in forward gear. Most use an internal brake and epicyclic gears in reverse. There is minimal wear to the brake band and gears, because they are only used in reverse.  The gearboxes were fitted to numerous types of engine, as well as to the Parsons marine engines.

How to identify your Parsons gearbox

The main box, or "reverse gear" can be identified from the table below. We'll add some photos to make this easier shortly. Look for the Marinomatic head or manual gear lever, which side the dipstick is on and the shape of the casing. All the gearboxes should have a brass plate with a unique set of numbers. We can identify the gearbox from these numbers - or if there is no plate, we can identify it from photographs. Various reduction gears can be fitted to each "reverse gear", so please refer to the relevant manual to identify your reduction gear.

Benfleet





Gearbox
Used with
Notes


Type A Parsons Goosander diesel (11 SHP) Manual, 2 way friction clutch
Parsons type
                      A

Type B
Parsons Prawn petrol (24 SHP)
Also 102E4M
Petters AV2M
Manual
Parsons type B

Type C
Parsons Sea Urchin petrol (35 SHP)
Also 105E4M
Perkins Four-99 and 4-107
BMC Vedette
Petters PJ
Marinomatic
Parsons type C gearbox

Type D
Perkins Four-99 and P3/144
208E4M and 209E6M
Manual or Marinomatic
Parsons type D

Type DA
Parsons Pike II based on Ford 2712E diesel (72 SHP)
Also
Perkins Four-99 and P3/144
208E4M and 209E6M
Bedford 220
Ruston and Hornsby engines
Manual


Type DA
Parsons Pike II (65 SHP)
Also Perkins Four-99 and P3/144
208E4M and 209E6M
Bedford 220


Marinomatic, Mk I, II or III
Parsons type DA gearbox

Type F
Parsons Merganser, Peregrine, Pike and Porbeagle
Also Perkins engines
Manual
Parsons type F

Type G
Parsons Marlin (65 SHP), Barracuda (86 SHP)
Manual


Type HG4
Parsons Barracuda turbo (108 SHP)
Also FH6M, Bedford 330, Cummins V6 & V8-185M, Perkins 270D engines
Marinomatic, Mk I & II
Parsons HG4 gearbox

Type HG4 4/100 Parsons Barracuda II based on Ford 2715E (108 SHP) Marinomatic

Type HG4 30/100 Parsons Porbeagle II based on Ford 2712E (72 SHP) Marinomatic

Type MG4
Parsons Porbeagle II (65 SHP)
Manual


Type MG4 4/100
Parsons Barracuda II based on Ford 2715E (108 SHP)
Manual


Type MG4 30/100
Parsons Porbeagle II based on Ford 2712E (72 SHP) Manual

Type H
Various
Marinomatic, the largest Parsons marine gearbox
Parsons type H gearbox

Type 65




Type 76/100
Parsons Force 12 (158 SHP)
Also Cummins V6(N)-215M
Marinomatic





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