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Hello Chris/Tracy,
This is probably not the
solution for the problem, but I had a similar situation with my second
rebuild for my RX-7 car. I didn't experience it with my first aircraft 13B
rotary engine rebuild. During my second rebuild, when I was
installing the oil pump chain and sprocket assembly, the KEY that aligns
the oil pump sprocket was not properly installed. I was in a hurry to
install the KEY, and I never positioned it properly as I slipped the oil pump
chain and sprocket assembly. After installing the front cover, I
found the KEY laying on the ground. If I had
assembled the engine that way, I wouldn't have had very much oil pressure ( or
possibly none at all). That KEY appears simple to install, but
I found it a bit tricky.
Just my two cents.
Tom
----- Original Message -----
Sent: Sunday, March 01, 2009 6:46
PM
Subject: [FlyRotary] Re: Still low oil
pressure
Really hard to draw any conclusions without knowing what 'a
little flow' is. At cranking speed it should be enough to make a
good sized puddle on the floor in 3 - 5 seconds. Does your first
paragraph imply that there was more oil flow before the filter than after
it? If true, that is suspicious.
If you still suspect
priming as the problem, have you tried to force some heavy weight oil (40 - 50
wt) back toward the pump with air pressure? If there is any significant
oil flow through the pump, it ought to prime immediately unless it is a
totally clapped out pump.
BTW, are you sure your oil pressure reading
was accurate and not just an instrument problem?
Tracy
On Sun, Mar 1, 2009 at 7:58 PM, The Mallorys <candtmallory@cebridge.net>
wrote:
No luck today.
I filled the line out of the engine just after the pump, then cranked it
over with the starter. I did get a little flow, but not very
much. I reconnected the hose, and added components as I went, checking
that I had oil flow after each. Still had flow after the cooler and
just barely a trickle after the filter, where the oil should go back into
the engine. From this I am thinking either I am not picking up enough
oil, or the pump isn’t pumping enough oil.
The only way I can think to eliminate the oil pickup as a problem is to
drop the pan, and feed directly into the engine from a container. This
will be a little bit of a pain, as I will have to remove the radiator, drain
the pan, then remove it.
I don’t know how to check the pump. Any ideas or suggestions?
Is there a way to check it without removing the rear eccentric shaft
bolt? It was a royal pain to remove last time, and I really don’t want
to have to remove it again if there is another way to check that the pump is
pumping.
I am not using the apex seal oil pump. All I did was cap off the
hole on the outside of the block, and left all the internal parts. I
don’t think this should make a difference, but thought I would mention it in
case.
Chris
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