glane85

Hi there,

A while ago, the car started to smoke heavily, but only on startup. When having a closer look I found loads of oil in the airbox, in the air-bypass-valve and tubing, and in the pipes from the turbos onwards. After checking it wasn't pulling oil up from the filler neck (fitted a catch tank), it was decided the turbos were leaking. So pulled them and had it confirmed one was leaky. I had them reconditioned and have re-fitted them, but the car is still doing the same thing.

Assuming the turbos are fixed, what other causes can be causing this?

The only thing I can think of, is a seal starting to go in the engine, and I am getting compression gas build up in the sump. If this is the case, what, if any, other symptoms are there? The car is standard, starts and goes fine. I have not had a compression test yet, but am about to sort one out soon.

I did read while doing searches on the "oil in inlet" subject, that a seal in one of the MOP injectors can go, and drain oil back towards the turbos. But having looked at the service manual and piping diagrams, I cannot see how this is possible. Anyone know whether this is correct?

Thanks,

Andrew

rizzxx7

iTrader: (4)

your turbos are blown

glane85

Yes, thanks for that.

As I said above, they were stripped out and checked over, and one had a minor leak, the other was OK. The seals were replaced. So for the time being, I assume they are in working order. Hence the question - what else could cause the problem.

If there were a side seal going, leaking some compression into the sump, would this cause a back pressure that would affect the return oil flow from the turbos back to the sump - presumably building some pressure and forcing the oil past the seals in the turbos and into the inlet charge?

Thanks!

c00lduke

Yes it would. Doing a compression check would may allow you to see if a side seal is stuck.

glane85

Thanks.
I did have a compression test done, but the place doing it didn't record the 3 pulses , and only gave me an average for each rotor. 7.1 and 7 bar. Bang on Mazda spec, according to the servoce manual. Obviously I don't know if one of those figures is 7.2 + 7.2 + 6.8, for example. Am going to get someone who can record the 3 pulses.