Hey Charles, Have a 504 but have never been into this. Just got thru replacing O rings on the D & P control shafts on a 666, almost the same. Looking at the 504 parts book the drain plug is supposed to be in the left front corner of the housing. Yours appears to have already been removed. I don't see it in the pics. Check in that corner for a hole approx 1/2 in. dia. Don't see the standpipe either. 656 and 666 have them though.
As for the leaks, with all due respect to Allan, tear it down and fix it RIGHT. It's not hard to do but it is tedious and time consuming, lots of small parts.
You will need seal #37 in parts book CIH PN 383133R91 O ring #81 in parts book CIH PN 355967R1
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Today's Featured Article - On the Road with Dave Gohl: Auction Musings - by Dave Gohl. I was thinking the other day about all the auctions I've been to in the last few years. There've been many. Some have been very good, some have been well, disappointing to say the least. But no matter how good or bad auctions may be, we always seem to stay until the item we've come for or are interested in is on the block. I've been to some auctions near and far. I think the furthest has been the Two Cylinder 7 in the Amana Colonies last year. Lots of stuff, lots of people. I've also atten
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