2012 RXP-X Excessive Oil Consumption

[YellowDuck]

Bought a 2012 RXP-X 260 this year with 115 h (our first PXC). Now has 143 h. Ever since we bought it, it has consumed a lot of oil - maybe 2/3 of a quart every tank of fuel.

I found some oil in the outlet of the SC, so someone suggested I change out the main seal in the SC. The mechanic i bought it from had actually rebuilt the SC before selling it to us. But anyway, I took it apart and replaced the seal, as well as the two o-rings on the SC stem. This had no effect - still using piles of oil.

It's definitely not leaking into the hull, because at this point we would be talking about several gallons (pretty hard to miss). This weekend I will check the plugs and do a compression test, and also find out how much oil is in the intercooler. Anything else I should check? It does seem down on power - turns maybe 7800 and tops out at 62 mph - but otherwise runs fine.

Grateful for any and all suggestions.

 

[skiasylum]

Checked the service manual on high oil consumption.

1. Oil in breathing system.
Check if breather V-ring is brittle, hard or damaged. Replace V-ring.

2. Valve stem seals worn or damaged. Replace valve stem seals.

3. Piston rings worn out (blue colored exhaust smoke). Replace piston rings.

 

[skiasylum]

V-ring is part of the blow-by valve

 

[YellowDuck]

Checked the service manual on high oil consumption.

1. Oil in breathing system.
Check if breather V-ring is brittle, hard or damaged. Replace V-ring.

2. Valve stem seals worn or damaged. Replace valve stem seals.

3. Piston rings worn out (blue colored exhaust smoke). Replace piston rings.

Okay, thanks very much! I was wondering if the breather system could be to blame - wouldn't that be nice if that was all it was. But someone else told me there was no PCV, just the TOPS mechanism itself. Anyway I will check it out. I was thinking of putting the breather outlet hose into a catch can temporarily to see what comes out of it.

Thanks again for this.

 

[skiasylum]

The TPS is integrated within the blow by valve and someone is correct no PCV.