I have the reproduction version of the shop manual and it has that saying in it.
The oil pressure on my 881 is low like yours, about 12 psi at idle, 30 at pto speed, I'm using Delo 400 15w40.
I'm thinking about dropping the pan and changing oil pumps, I'm pretty sure Ford upgraded the oil pump later on, dads old 850 would make 60 psi cold, run 40 psi hot and 20 psi at idle, oil pump wasn't the original.
My 881 is a 62 model, last year of the 801 series, in 63 they painted them blue and called them 4000
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Today's Featured Article - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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