![]() ![]() If you remove the 2 middle cylinders of the 6 cylinder engine you get the 4 cyl version. The B series include the 3.9 (4 cyl )and 5.9 (6 cyl) and later on the 4.5 (4 cyl) and the 6.7 (6 cyl). In 2008 Cummins purchased the other 50% of the shares. In 1980 Cummins and Case ( now CNH Global - Case New Holland ) did a 50/50 joint venture to produce what we know as "B" & "C" engines and later ISB ISC and ISL engines for automotive & industrial markets. The number again is (483566) and is a v 8 of some kind.Before I share the ESN's that I came up with I thought some of you might be interested in a little Cummins History. ![]() ![]() If anyone could help me with that serial number as to which enigne I have it would be much appreciated. I would hate to tear up a working thermostat that I cant even get, if thats the case 150 degrees is better than a missing thermostat lol. I started to take out the thermostat but thought I would wait till I find out some more info. I hope if the engine is a 265 I can get parts for it, the 903 is hard enough, well almost imposible. the truck is a 1966 281 peterbilt single axel day cab with a very short wheelbase. I have looked hard for the serial number and finally found it, it was under number 8 cylinder head about a quarter of an inch by 1 inch long and it reads (483566) and since the last numbers are 66 that helps me believe its the original motor that came with the truck. there is a 265 cummins on ebay and it looks alot like my enigne. ![]() I ordered a 903 thermostat and the one that came in dont look anything like the one in my truck. Well its begining to look like I dont have a 903 afterall. On any engine, a common place for numbers is below or behind the head mating surface, usually small stamped number on a portion of the block thats been machined flat and smooth.Sometimes on a Vee engine the numbers will be at the very front or very rear top edge of the block between the heads.It wont take much grease to hide them no matter where they are.Steam clean it or grab a rag and some degreaser ( thinner, brake cleaner,ect. What kind of tractor is it in ?.The V265 was real popular in short cab/short wheelbase units. I think Cummins guy is right, youve probably got the short stroke engine, probably a V265.Ive never seen a V903 without the numbers cast into the rocker covers, but they might have made blank covers.Not sure what year the 903 started, but I'll agree that its probably later than '66. There were two big bore class 8 V8 cummins, the 785 series and the 903 series ![]()
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