Peter the next time I see an LR1 or SL1 being used for the aplication I was talking about I'll try and snap some photo's of it. Most of them are bolted to an FMC Royal Bean pump, these are a 3 cylinder hi presure pump. The output shaft on these engies has an odd attachment that looks like a gear reduction. I'm not an expert on these engines but I'm told this reduction unit is a Lister part, and the only part that can't be purchased for these anymore....
diesels deep in the woods
Heat them with a tiger torch to thin the oil, a little heat to ensure the cups aren't frozen in the bean and little effort to start them. This is probably why they stayed in service so long, try that with a Honda or Kubota.....
Doug