Zyrano

Hey guys, just want to get some experienced feedback. I have a leak around my omp. the omp has a light coat of oil on it, but it looks like a majority of the oil is on the lower line rubber fitting (i can see it dripping from the lower rubber fitting clamp when the car is running), while the upper line is bone dry. Do you think it's just the line, or could it be the omp?

Thanks,

Alvin

trochoid

iTrader: (6)

Those rubber elbows will develope cracks in the grooves. Take the line off and inspect closely. I've had to snip off the end of the elbow, where the clamp went to get past the cracking.

Clean everything thoroughly with brake cleaner, when you put it back together. Then keep an eye on it.

Aviator 902S

It's most likely the o-rings inside the metering pump itself. They go brittle after 20+ years and then leak. I'm assuming that your engine is a 12A.

Replacing these seals only takes an hour if that, but you need to get VITON o-rings. The normal neoprene ones don't last or stand up to heat. You'll need two 13/16" O.D. x 1/16" cross-section o-rings to go under the end caps (they fit into a diamond-shaped groove), and one (approx.) 1/4" O.D. x 1/16" cross-section o-ring for the actuator shaft that comes out the same side as the nylon lines. These o-rings should be available at any major o-ring supply warehouse.
BTW, the 1/4" O.D. o-ring is actually the metric size that's slightly larger than 1/4". The difference in O.D. between the two is almost imperceptible. You'll also need to pick up a metering pump gasket from Mazda. I't about $3.

Zyrano

Thanks guys, the o rings and seals are brand new (the engine was just rebuilt) So i'm hoping it's just the line and that i don't need a new omp...

We'll see tomorrow...

Alvin

Aviator 902S

When they rebuild an engine they of course replace the o-rings and seals in the engine--- but not those in the omp. The omp is an external item (like an alternator or carburetor) and therefore not considered part of the "engine rebuild" process.

An engine rebuild consists of removing all external components from the engine core, tearing the core down, cleaning, inspecting, measuring, replacing worn parts, re-assembling and then re-attaching all external components.