more questions sup engine rebuild

[Billy26F5]

I have seen dual drillings for exhauster feeds here, but really don't know about this, looks like there were small unlisted variations. The camshaft in question looks like 528E-6250D, from the look of the cams. It might just be a lorry feature, but don't know for sure. Could also be specific to later lorries (530E-25471, 502E-60516, S236238, equivalent to 1609839). See what part number there is and measure the cam lift (approximately, lorries are 0.303", tractors 0.255", O.F. is the same plus 0.003") also look for a red spot or O.F. stamped on it. That will clarify what it is. Good variety of heads behind there!
Sandy

[John b]

It's just a picture I found on eBay, says its fomoco 4j22a so must be post 63? The reason I ask is that a friend rebuilt an engine, had good oil pressure but couldn't get oil to the rockers. I went through everything and eventually pulled the camshaft out. The journals in the block were worn oval, borderline top end wear limit but he didn't want to spend any more money on it. I found an old camshaft from a scrap Super Major engine out of a JCB that had snapped and noticed the 2 oil drillings and measured the position of the 2nd drilling, drilled a 2nd hole in the camshaft and bingo, oil to the rockers with no drop in oil pressure! I wondered if maybe this was the reason the 2nd oilway was added, to keep the oil flowing to the head when the cam journals in the block wear?

[Billy26F5]

Could the drilling in your friend's camshaft have been out of position? Not likely but just a thought. Could also have been dirt in the drilling. I think the code is 4J29, but there were no changes from June 61, so if it was a late change that's as late as it came (unless it was never mentioned, not impossible). Haven't read any details on this, so it could well have been a thing Ford weren't bothered about. In a similar case fitting camshaft bearings could be worth it, if you can find some. The feed to the rockers is so limited it's unlikeky to affect the oil pressure in the bottom. I'll check our old camshafts and see what we have.
Sandy

[John b]

The original oilway was in the correct position and all the drillings in the block were clear. It's the only time I have ever seen this (although goggling it found a few cases but with no solution) and after checking everything 3 times I was running out of ideas so decided to drill a 2nd oilway and it worked.

[Billy26F5]

Was this tractor older than 1599502? I've just checked both our old camshafts (both E1ADDN-6250D) and both have two drillings. It could be a change issued for the new setup, or even 1609839. It could also go back to 1511488 when E1ADDN-6251 appeared. It could also be related to a repro part, for they don't seem to have two drillings (and the pic you posted shows a genuine one with them, and I think it's 528E-6250D, just like they make now).
Sandy

[John b]

I have definitely seen both single and double drillings, not sure how old it was because as with a good many Majors now there are alot of 'bitsas' around. Guess that is part of what made them so successful was the use of interchangeable parts across the range of agricultural and industrial models

[Billy26F5]

Really asking about the age to know what camshaft it had, indeed Ford sometimes asked for a bitsa repair, such as the service camshafts E1ADDN-6251C and 528E-6251C and gears E1ADDN-6256B and E83-CP-9 and E84-CP-9. Not just that but also between petrol and diesel, notable in lorries more than tractors as there seem to have been a lot more petrol lorries. I belive the O.F. camshafts were E1ADDN-6250B and 528E-6250B but no part numbers have been published for these as they were regarded as interim.
Sandy