Jack & The List,
>Does anyone have the conversions for British military lubricants to US
>equivalents?
>
Yes.
This seems to come up annually and its in the archives somewhere.
>I have listed in my UK Army manual OEP #- - - but, unfortunately it
does not
>translate to the US, SAE #- - - - numbers.
>
British army specs translate thus:
OEP - Oil Extreme Pressure.
OMD - Oil Mineral Detergent
OM - Oil Mineral.
XG - Grease
PX - Additive
AL - Antifreeze
The Ferret will call up OMD 110 for the engine and gearbox, this is a
high detergent SAE 30 (MIL 2104). Later manuals may refer to OMD 75
which is a first generation 10W/30 and not a bit like current multigrade
oil.
Advice here from the Specialist engines div of Rolls-Royce, who made the
B60 (B = engine type; 6 = cylinders; 0 = 3.5" bore [1 = 3.75" bore]) in
the Ferret was:
"We designed, developed, tested and approved the B range engines on SAE
30* to MIL2104, but its your engine sir so you can put in it what you
like."
*For atmospheric operating temps of 23ºF - 89ºF, above that SAE 50.
Incidentally only the B81 engines have fully hard exhaust valves and
seats, all others will need some lead replacement additive to keep
things happy, mil service schedules call for the replacement of exhaust
valves at 20K miles, B81's excepted.
Further research with the technical departments of the major
multi-national oil companies gave the general answer that straight 30 is
advisable owing to the intended high oil consumption (relatively to
todays car engines) where a multi-grade produces a small amount of very
abrasive ash that quickly wears piston rings. For any gearbox
application they advised that straight oils were more mechanically
robust and would not advise the use of a multigrade. Its interesting to
note that many current production big diesels are specified for SAE 30
only even now.
With a Stalwart to maintain needing 5 imp gallons in the engine (B81), 2
1/2 gallons in the gearbox and 1 gallon in the twin air filters, the
cheaper, single use of OMD110/SAE 30 became attractive. I personally
use Silkolene Ashford 30 which is qualified to MIL 2104D and about 1/3
the cost of a multigrade, this company has a huge reputation amongst the
car/motorcycle racing people and have US outlets as I found on a web
search - try looking for Silkolene or Fuchs Lubricants.
OEP 220 is EP90 hypoid gear oil, EP80W/90 is quite acceptable.
XG 279 is a calcium based grease.
OX 8 is brake fluid.
Often these 50's/60's vehicles use hydraulic oil OM 13 in
brake/clutch/steering/winch etc., this is a near equivalent of any ISO
15 hydraulic oil, the official stuff being the red aircraft hydraulic
oil and not cheap, BP Bartram HV 15 is the commercial direct
equivalent. (Re-mortgage the house first.)
OX 320 is occasionally called up as an additive to the reduction hub
oil, this is colloidal graphite in suspension and does little or nothing
except make the oil very black, its prime use is gun recoil slides.
>AIR FILTERS and OIL FILTERS:
>
>On the Ferret Mk 2/3, anyone know a good way to convert from the not so
great
>oil bath filter to a dry paper filter? Same question with the oil
filter, is
>it possible to use a commercial oil filter instead of this old
ineffective
>gauze wrap that must be rinsed and cleaned?
>
The Ferret Vokes (195 ft³/min) oil bath air filter is very good at its
intended purpose and the result of a very expensive research exercise
post W.W.II with the desperate experiences of the N African desert. It
can be readily cleaned in the field and re-filled, and is capable of
retaining a huge amount of particulates before becoming choked; in
"domestic" service you probably only need to service it once ! In the
bigger B range engine applications two are used.
The "bat-wing" felt oil filter _can_ be replaced with a (UK) Crosland
#432 paper element, which I know are available there, however. . . . . .
. . .
The B Range engines are designed for high volume oil flow with the
relief valve set to 30 psi, felt filters on the face of it have a poor
spec for filtration at typically 25 micron against a high flow rate,
whereas a paper element is 12 micron at the worst but needs a
substantially greater area to achieve the flow. The felt is
proportionally very thick though and filters better than the void size
spec would suggest as its a bit like trying to hit a golf ball through a
forest, plenty of space between the trees but one of them eventually
gets in the way.
The felt filters are readily obtainable here ex mil either as the
element or very cheaply as a complete unit already fitted into a new,
unused housing assembly:
Marcus Glenn,
The Acorns
Baulk Road
Bisbrooke
Uppingham
Rutland
LE15 9EH
UK
Phone/fax: Intl+44+[0]1572 821726
Sorry to be so long-winded,
Regards,
Richard
(Southampton UK)
===
To unsubscribe from the mil-veh mailing list, send the single word
UNSUBSCRIBE in the body of a message to <mil-veh-request@skylee.com>.