I just bought an s5 vert with a blown engine. It blow up at 10k with no oil pressure and the rear rotor spinning the bearing and sending metal through the oil system. I've got it apart and I'm replacing a lot of the parts. Both rotors, crank, main bearings, oil pump, oil cooler, etc. Remarkably the cases all look really good, like 10k new, and all of the hard seals and springs are good to. But there are some scratches on the front rotor housing under the oil pump that worry me a little. I took a sanding block and some emerycloth and smoothed it out some but there are still some deeper scratches that bother me.

Please take a look at this picture and tell me if I'm ok using this.





Thanks,
John

 

welcome to the board.

valid question. no doubt debris from your incident likely caused that. i would first check the FSM and see if there's a spec for that. i am certainly unsure. i can't remember ever having this issue, but my gut tells me you'd be okay using it though. i can't see where either of the two areas in question would bleed pressure or flow to any significant measure.

 

Thanks for the reply!

My thought too. I did check the clearance on this surface according to the FSM and it is well in spec. And as you said the scratches probably won't cause any significant bleed in pressure or flow. Since the oil pump usually puts out way more pressure then is needed by the engine and I'm replacing both the front and rear regulators, the main bearing will be new and the rotors I bought both have good bearings that are in spec, I think the pressure will be fine. Just looking for a second (or more) opinion.

I'm not sure what exactly was the cause for this failure since I bought it this way. Could have been that the guy just ran it with no oil as far as I know. I cut open the oil filter and it was plugged with metal. But regardless I'm building this one out to be a reliable daily with a little extra, mild street-port.

If anyone else wants to chime in I welcome the opinions, encouragement or criticism.