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This can be a seminal second within the historical past of my SQ4. For years it is had an oil leak which I’ve all the time assumed to be poorly sealed pushrod tunnels on the head joint. Nonetheless, having addressed an issue with a leak from the oil tank cap, one thing else which it has all the time finished, I resolved to have a look at the drip from the rocker feed pipe.
The oil tank cap has all the time had a weep from the breather:
Which interprets to a moist leg on an extended, quick run:
Taking a look at that first image, I obtained to questioning why the cap has a vent gap when the tank has a piped breather that I’ve taken previous the rear wheel. Absolutely the cap needs to be sealed?
It seems that Sq. Fours do not use the identical cap as different Ariels. I seen that the 1951 SQ4 components checklist has a -32 quantity for the cap – most bikes (aside from Sq. Fours) I’ve seen use a -29 quantity. Possibly 5854-32 has no breather gap.
A blob of solder will type it.
Onto the rocker feed. I ran the engine chilly (75 psi on the gauge) and because the oil warmed up the leak appeared:
Now, my dangerous – I forgot to take a digital camera to the workshop once I mounted it. It turned out the tube was not pushed into the becoming in any respect – it was simply held in place with a fillet of solder at one finish, and had been like that for years – most likely eight years. It has been leaking for many of that.
All mounted now.
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