CRSCRS Posted September 19, 2017 Share Posted September 19, 2017 Hello all, my Leyland Martian steering tank states OM13 mineral oil is to be used but someone prior to my ownership has marked on it that OM33 oil is to be used, now are either of these oil types suitable for use with a more modern power steering pump - namely from a 1993 Cummins C series engine or will the more modern seals in the pump not like it ? Cheers Chris Quote Link to comment Share on other sites More sharing options...
Richard Farrant Posted September 19, 2017 Share Posted September 19, 2017 Hello all, my Leyland Martian steering tank states OM13 mineral oil is to be used but someone prior to my ownership has marked on it that OM33 oil is to be used, now are either of these oil types suitable for use with a more modern power steering pump - namely from a 1993 Cummins C series engine or will the more modern seals in the pump not like it ?Cheers Chris Chris, OM13 and OM33 are both army designations for hydraulic oils, the number roughly translate in to ISO viscosity grades. OM33 was the general hydraulic oil in army plant, it equating to the normal 32 hydraulic oil used in civvy street. The OM13 is an exceptionally thin oil. I would suggest you use the type of oil that suits (or is specified) the pump on the Cummins engine. I do recollect the power steering on some AEC lorries had engine oil in it. Quote Link to comment Share on other sites More sharing options...
marvinthemartian Posted September 19, 2017 Share Posted September 19, 2017 Chris, how much of the original steering sysrem is on the truck? Guessing the Cummins pump might be a ZF, and possibly used ATF. Don't know if the Martian steering jack seals would like it. Quote Link to comment Share on other sites More sharing options...
CRSCRS Posted September 20, 2017 Author Share Posted September 20, 2017 Thanks for the replies, the only non standard part of the Martian steering system will be the pump and oil cooler. would the p/s pump be ok with the civvy equivalent of OM13/OM33 ? Cheers Chris Quote Link to comment Share on other sites More sharing options...
john1950 Posted September 20, 2017 Share Posted September 20, 2017 I would stick to the oil spec for the pump. ATF oil is pretty benine, any problems with seals would probably have happened anyway. Pump lubricant is the most important as it has to cope with high speed and heat. Quote Link to comment Share on other sites More sharing options...
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