DIESEL ENGINE OIL MULTI-PURPOSE GREASE

Shell Technica l s e r v i c e s recent ly announced a new grade in the i r Rotel la T Oil range of d ie se l engine oils . Called Shell Rotel la T Mult igrade Oil, the new grade combines the p e r - fo rmance c h a r a c t e r i s t i c s of exis t ing Shell Rotel la T Oils with an SAE 20W/50 v i scos i ty span. These combined p r o p e r - t i e s enable the whole spec t rum of operat ing condit ions in near ly all c o m m e r c i a l vehicle engines to be covered with a s ingle grade of oil.

Shell Mex and BP Ltd, Strand, London WC2

DRY-LUBRICATION TREATMENTS

Dant are now offer ing a range of r e l e a s e coatings, ant i-f lux tool t r ea tmen t s , dry lubricant t r ea tmen t s , and lubricat ion s y s t e m s .

Although the formulat ion of the ant i - f lux tool t r e a t m e n t s are not d i sc losed an init ial r e su l t f rom a pa r t i cu la r application indicates their potential . An 11/32 in (9 mm) dr i l l was being used at Vickers Ltd, Crayford to dr i l l i/4 in (6 mm) deep holes into cas t iron components . Each component had four holes dr i l led pr ior to t r e a tmen t a dr i l l completed 30 units i.e. 120 holes before regr inding.

Following t r ea tmen t of the dr i l l by Dant Limi ted the dr i l l completed 156 units, i.e. 624 holes. The machine was then changed to another operat ion. The dr i l l s t i l l appeared to be in good condition. Each component took six minutes to complete . Removal of the dr i l l r egr ind ing and ref i t t ing took just over an hour. The re fo re one could assume that the dr i l l in use for 3 hours and then inactive for an hour. It follows that the t r ea t ed dr i l l provided an inc rease in dr i l l life and a saving of five hours downtime on 156 components .

Dant ' s range of dry lubricat ion t r e a t m e n t s a r e based on graphite , molybdenum disulphide, and ptfe, held in var ious c a r r i e r s (synthetic oils, alcohol, a l coho l / r e s in , white spir i t , and propr ie ty formulas) . In some applications, for ins tance chains on vehicle body conveyors in automotive fac tor ies , components are f i r s t p r e t r ea t ed with a dry lubricant coating and are then lubr icated continually while in operat ion by an automatic sys tem. For this purpose Dant have recen t ly designed an automatic lubr ica tor cal led the Atomise r (Fig 13). A smal l t r ip lever near the spray head induces a t imed cycle of c o m p r e s s e d air opera t ing between 0 .2 and 0.55 N / m m 2 (30 and 80 lbf / in 2) to spray a m e a s u r e d amount of lubricant onto the component. The air continues to blow for a spli t second to c lear the spray head tube and avoid any poss ib le dr ips . The r e s e v o i r capaci ty is 2.3 1 (0.5 gad and the o v e r - all m e a s u r e m e n t s are; height 356 mm (14 in), width 406 mm (16 in), depth 178 mm (7 in).

Dant Ltd, Dant House, Arundel Road, Uxbridge, Middlesex

A new g rease , Mul t i -purpose Grease No 2, is now available f rom Acheson Colloids. The g r ea s e has a l i thium hydroxy s t e a r a t e base with added sol id lubr icants to improve load ca r ry ing capacity and r e s i s t shock loading. Some physica l p r o p e r t i e s given by the manufac tu re r s are :

NLG1 cons i s tency No 2 Drop point (1P 132) 185°C T e m p e r a t u r e range --20~C to 160~C

Acheson Colloids Company, P r i n ce Rock, Plymouth PL4 OSP, Devon, England

ENCLOSED GEAR LUBRICANT

A g rea s e with the flow p r o p e r t i e s of an oil i s the descr ip t ion Guardian give the i r enc losed gear lubricant , T r a n s g a r d FG. It is a blend of in terac t ing l amel l a r sol ids and a s e m i - s y n - thetic oil which is c la imed to provide b a r r i e r f i lm protec t ion f rom --40~C to +150~C. A low t e m p e r a t u r e grade is available for use f rom --65°C to 100~C. Successful appl icat ions include large indust r ia l gearboxes , s t ee r ing boxes, pit cage s l ides and ro l l e r chain boxes.

Guardian Industr ia l P roduc t s , Guardian House, Foxbe r ry Road, London SE4

FILTERS FOB JAGUAR'S V12

When designing the f i l t ra t ion sys t em on the new V12 Jaguar engine the re were th ree main r eq u i r emen t s , the f i l te r needed to have a large capacity, it was to be accompanied by an oil cooler , and it r eq u i r ed a secondary b y - p a s s sys t em.

A conventional f i l te r with rep laceab le e lement was chosen, but because under -bonne t space was smal l and because c a r s using the V12 engine had to accept both left and r ight hand dr ive s t ee r ing equipment, s i t ing was cr i t ica l . Eventually the f i l ter was fi t ted below the engine using a cut -away sump to provide sufficient space. The only feas ib le f i l te r shaped proved to be an oblong one (Fig 14) but init ial ly pulsa t ions of the lubricant f rom the oil pump caused s u rge s (par t icu- la r ly during cold s tar t ing) which moved the oval f i l ter can on i ts mountings. This was e l iminated by using a f i l t e r can with th icker meta l at i ts seal ing end. The f i l ter head cast ing was des igned to incorpora te a seal ing r ing for the can, an oil p r e s s u r e re l ie f valve, tappings for the oil cooler take-off and re turn , and a b y - p a s s valve for the oil cooler in addition to the b y - p a s s valve normal ly fi t ted to full flow f i l t ra t ion s y s t e m s .

Teca lemi t Ltd, P lymouth PL6 8LA, Devon, England

70 T R I B O L O G Y M a y 1971