Hi there, just bought a 1961 D7D out of euroauctions uk, changing all the oils on her, does the oil need to be mineral oil and not oil with the detergent in it? and does anyone have the part numbers for the engine oil and fuel filters? Serial number 17A14739 Looking to buy a workshop repair manual so fit anyone can sell me one i would be most gratefull. Im in the uk so manuals seem to be not available here very often.
Ay up lad. Tha reet..?? Regarding the oil type I would say you're correct that it should be a monograde oil, not a multigrade with all the detergents bells & whistles in it. I had a quick hunt around and found a parts manual on the Cat Publications website. Go to the link below and click "Continue as a Guest" when the first window pops up. https://catpublications.com/ Type UE033467 in the Search box and click "Go". The manual you require will be the top one on a list of 19 documents. $89 for an Adobe pdf download from the web. For a machine of this vintage it may well pay you to also register on the ACMOC web site and ask questions there. https://www.acmoc.org/
Nige … What's your reasoning to say " should be a monograde oil, not a multigrade with all the detergents bells & whistles in it." ? The oil chemistry advances since 1961 allow higher operating temps, longer service, cleaner internals, etc.
I don't see an issue with using detergent oil in any machine, but you should flush the motor a couple of times first, as the switch will disturb the accumulated grime the non-detergent oil left behind.
The only thing I can think of is maybe call the service dept of your local Cat dealer and ask them. Hope this helps.
1960s Cat piston ring packs used 'square rings' instead of tapered 'keystone' compression type. Maybe a monograde oil would use less oil between service intervals. 1960s service intervals were typically @ 150hrs. I've had engines that would consume oil after switching to multigrade engine oil, even over-the-road trucks. Of course, today's typical diesel is low sulfur that requires different oil additive packages.
Thankyou everyone for your input, will stick to the mineral oil 15w 40