Black oil discharge

[darrylmccaw]

I have a 1994 GTX... We premix the fuel, oil pump quit... Anyway, took it out of storage and fired it up to make sure all was well... Today, there is a thick black oil coming out of the exhaust... Any thoughts what this could be? There was enough to cause a small puddle on the garage floor... Thanks for any help...

 

[mikidymac]

It's either caused by leaking crank seals from the oil tank through the rotary cavity or leaking needle and seat flooding the engine.

 

[darrylmccaw]

Are either of those, or both catastrophic? Because I just had the motor rebuilt...

 

[darrylmccaw]

I also just rebuilt the carbs...

 

[KyleW2]

I also just rebuilt the carbs...

Did you replace the needle and seat when you did so?
The kit does not include it.

 

[darrylmccaw]

I did...

 

[mikidymac]

If it’s thin and watery like gas it’s the needles and seats. If it’s thicker it’s oil and the seals.

 

[darrylmccaw]

It's thicker... Will it just burn through oil? Our will the motor blow up again?

 

[mikidymac]

It will go through a lot of oil but when it sits it will flood with oil.

 

[matempl]

How much smoke came out of exhaust when you started it? Crank seals flood the bottom end with oil and on initial start up it’s a massive amount of smoke. If you’re pre mixing you will use more oil then the oil pump will. I pre mixed my gti the first year I had it and I always had a oily film on the back at the exhaust. When I started it out of the water it would literally drip oil from the exhaust. That was at 40/1. Since reinstalling the oil pump that problem is gone.