Can anyone clarify how, on the 16H (my rebuild is a 1938, but I think the same question is there for the plentiful WD and other SC engines), the timing panel delivers oil to the crankshaft big-end? There's a nice conical seal from the oil pump delivering into the timing panel, but I can't see how the timing panel crank feed seals out to the crankshaft. I seem to have quite a close fit between the timing panel's machined oil-feed nipple and the crankshaft nose, but would have hoped there was some kind of fibre or hard rubber seal also?
None of the period documentation I have mentions a separate seal.
Hello, The attached photos show you all that is required. There is no seal on the brass quill. Just held against the pinion by spring pressure. Note prewar quills are significantly longer than post war quills.
.....this is a relatively low pressure roller big end, not a plain bearing that needs the high pressure and a seal.
.. a conical seal which I assume is a rubber one on the oil pump outlet? This would be a Commando item rather than from a single, which should have a fibre washer which is thick enough to hold the timing cover approx 1/32" away from the crankcase when uncompressed.
However, I think the Commando item should do the job OK but make sure it is compressed when the timing cover is tightened home.
Seems from Ian Richtsteig's posting I have the wrong timing cover, as mine has a fixed (steel) chamfered oil jet that fits quite nicely inside the oil pump worm gear but has no spring-loaded element.
See attached picture of my panel.
p.s to Ian Soady's comment, I read somewhere that the later type Oil Pump conical seal could be fitted to pretty much anything, and it looks like it has a couple of mm compression on my build so should be good.
Hi again Russ,
Just to clarify what your set up should be I have attached a couple of photos from my prewar 16H manual.
The second photo shows the steel jet holder fitting through the timing cover and the brass oil feed quill and spring.
You should be able to unscrew the round cover (part no 22) on the outside of the timing cover to replace the quill and spring.
Thanks for the really useful info, Ian. Makes perfect sense (although there's going to be a fair bit of wear with this set up).
Alas my timing cover doesn't have any external access to the oil feed (no 'part 22') so I'm guessing it's a later part.
I don't want to give up on this cover though, as the fits everywhere are really good (inside and out) and it's only this one issue now, so I'll try to unscrew the steel feed jet on the inside and see if that gives me any clues.