| Mazda
RX7
| Rebuilding S4 Metering Oil Pump |
Decided to go through this
becuase I didnt see anything like this in
the archives with any specific part numbers and mainly I wanted to keep
my OMP working.
The
OMP tends to leak at the end cover plates or at the lever. These areas
have orings that get hard stop sealing correctly.
First
thing to do is disassemble everything, you will need a phillips
screw driver and a 10mm wrench. Make note of how things go so that its
easier to put back together. Take a small toothbrush and aerosol brake cleaner and clean/degrease
everything.
Leaking
Lever O-Ring:
This
where I have seen most of the oil leaks coming from:
The o-ring gets rock hard and doesn't seal any more.
Replacement
O-Ring:
The
original o-ring is a triple seal type and pretty thick
After
a few measurements I started sourcing different types of orings. The
best one I came across was from McMaster Carr http://www.mcmaster.com/asp/enter.asp?partnum=9464K109.
The o-ring is made of Viton, the ID fits tightly where the old one was
and the OD makes it fit snugly in the bore. The only thing is that the
Viton oring is not as wide as the original.
Sealing
the endplates
I
couldn't find any orings to replace the orings so I used black rtv.
You want to use the rtv sparingly, just enough to fill in the areas
where the orings would be and enough to seal the plate to the pump body.
After putting everything
together, I used more rtv to reattach the pump
to the front cover. Even if you use a new o-ring at this point, wait a
while until the rtv sets.
I
have been running my rebuilt omp for about 2 weeks now, over 1200 miles
,and still no leaks.
Hopes
this helps some people. As my usual disclaimer, try at your own
risk, this worked for me but not guaranteed to work for everyone.
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This Write-Up is For . . .
Mazda RX7 | 2nd
Generation (FC3S)
Submitted By:
kungfuroy
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