There is Lister range numbered LPA3, LPA4 etc I wonder if it is one of those.
My Lister manual covers the LPA3, LPA4 as well as the LPWS3, LPWs4 etc, LPWT3 ...........
I think it is probably an LPW4 A (rotation) and 48 (build), but having said that ..............
But - Could it be an LPA4 48 ?
With the '48' being the build specification ?
Engine Serial Number
The engine serial number is stamped on a plate
attached to the engine.
It is necessary to identify the type and build of each
engine to enable the correct maintenance procedures,
as described later in this publication, to be carried
out.
An example number is shown below.
03 00123 LPW3 A 01
03 ............ Year of manufacture code (03 = 2003)
00123 ...... Consecutive number of engine
LPW3 ...... Model
(T = turbocharger, S = indirect injection)
G = gas fuelled)
A .............. Anticlockwise rotation
01 ............ Build of engine
01.4.3 Marine Builds
Marine engines are designated Builds 40, 41, 42,
43, 44, 45, 46, 47, 48 and 49.
In general 'Alpha' marine propulsion engines are
designed for the following applications.
LPA - leisure and commercial craft.
LPW - workboats and commercial craft.
LPWT - workboats and commercial craft.
LPWS - canal boats.