My very early engine bottom chain oiler, this is the device with
three small holes drilled in it and which is attached with two
small fasteners to the engine block,This device has no ball and
spring restrictor fitted like the oiler on the later xk 140 engine.
I am planning to fit the timing gears and hardware from a 140
engine and would like to fit the 140 oiler I am also planning to
fit 140 camshafts. are there any problems that I don’t know about
in making these modifications?? [It seems to me that no restrictor
in the oiler would tend to lower oil pressure as the oil would pour
out without having to overcome a ball and spring especially on
startup am I missing something ]I would welcome imput.
Regards
Michael–
jagman
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from newrynuck sent Thu 19 Apr 2007:
Don’t know the early engines but IIRC the ball and spring are there
to prevent (hah!) leak-back so the chain remains reasonably snug
during shutdown. This is so on starting up the engine doesn’t
rattle when there is no/low oil pressure for the first few seconds.
The ball and spring would not be a major restriction on flow in the
same way as the fit of the parts which it eventually leaks past,
since there should be no major ‘flow’ in the first place in the way
there is with a shell bearing.–
The original message included these comments:
in making these modifications?? [It seems to me that no restrictor
in the oiler would tend to lower oil pressure as the oil would pour
out without having to overcome a ball and spring especially on
startup am I missing something ]I would welcome imput.
"To eliminate wastage of oil pressure at low speeds a ball valve is fitted
to the jet feeding the lower chain, which restricts the feed of oil at this
point when pressures under 20 lb. per sq. in. are obtained.
in making these modifications?? [It seems to me that no restrictor
in the oiler would tend to lower oil pressure as the oil would pour
out without having to overcome a ball and spring especially on
startup am I missing something ]I would welcome imput.