RedMVa, interesting information you have added. Let me also say this you are far more the authority on this subject if you have worked on one of these engines I have not. To double check against the parts book that claims the required number of cam bearings is 5 what is your experience with these engines? Are you certain you are not confusing the fact that the gas engine for this tractor does indeed only have 3 camshaft journals? The main missed opportunity here is that the OP did not upon him receiving his replacement block immediately do a thorough comparison of it with the original to make sure it was an adequate replacement part. In the 1st link is the CNHI parts page for the D-239, this is the only parts book available for the 674 diesel engine. The block is key number 1 showing the part number given in my previous post. Key number 29 is the front cam bearing showing 1 required, key 31 is the cam bearing for positions 2-5 showing 4 required to make a total of 5. In the 2nd link is the CHNI cylinder block parts page for the 685 diesel. It shows number 30 as the block part number which is 3136316R21 the same as shown in the D-239 diagram (the Rev. number shown in the D239 book is R13 a later or higher revision can replace an earlier one) The 685 parts diagrams also shows no. 10 as the front cam bearing requiring 1 and no. 11 as the 2 - 5 position cam bearing showing 4 required for a total of 5. I do not know how the ..cast in.. numbers of his block can tell him if it is correct, maybe someone else can. It may be possible that there are some stamped in numbers that may be of help.
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