Mazda 2.3 Engine ... not good !
I'm rebuilding a 2.3 MRZ engine from a rusty 2004 3 i paid $500 for. Big mistake !
This is a Strange engine.
The guy ran it low in oil and spin a rod bearing .
Weird thing, These Rod caps are not machined( where the caps go together).... they are Broken it seems !. The mating surfaces must have been broken apart under pressure after the hole is bored. It makes for a rough random surface that will only go together 1 way.
And Its all aluminum engine and a lot of the bolts are a pain to get out. Broke 2 long 8mm bolts that held the alternaltor.
Also there is NO key in the crank pulley, even though its got ignition pulse wheel on it ! . This pulley drives the Alternator and AC.. WTF ?? If it slips the engine goes out of time and may damage its self.
They put a plastic cover over the engine so you won't see all the rust that develops on all the cheap metal brackets that hold wires and hoses.
But I do like the timing chain (instead of a belt) as it showed no wear even with 350K on it. And It has a Variable intake cam timing that advances by centrifical/hydrolic control at high speed.
The transmission on these cars also gives a lot of trouble (this one has no 3rd gear) . Looking at used 3's many say similar problems.
And the body is so rusty, you wouldn't believe its a 2004.
Last edited by LARKEN; 5-31-12 at 20:16..