[natedog7700]

I recently developed a few boost leaks and did a boost leak test to find them. I pressurized the intakes and found a couple leaks but when i got up to about 20-25 psi i heard a really loud "bam" noise and i realized my plastic timing cover came off that sits right in front of the engine, behind the belt tensioner. I put the cover back on and i went about fixing the other boost leaks but now that everything is back together i tried running the car and it immediately blew tons of white smoke out of the exhaust... Very thick and lots of it. I shut it off right away and noticed white smoke lingering in the engine bay as well. Im a little confused as to what went wrong. Obviously i screwed up, but im not sure why my crank case was building pressure when the pistons should have stopped the pressure during the boost leak test. Does anyone else know whats going on?

[JM98]

That’s odd -

The cover that goes on the right?

Attachment 1896518

[natedog7700]

Originally Posted by JM98

That’s odd -

The cover that goes on the right?

Attachment 1896518

Yeah exactly, thanks for the picture. It pressurized the crank case right? How would air get passed the pistons? Or am i misunderstanding how the system works?

[JM98]

What specifically did you pressurize when you did the boost leak test?

[natedog7700]

Originally Posted by JM98

What specifically did you pressurize when you did the boost leak test?

I just plugged both inlets, one of them had a valve stem to which i added air (with air compressor) and a gauge to measure the psi.

[RSL]

PCV still connected?

[natedog7700]

Originally Posted by RSL

PCV still connected?

Yeah its still connected

[RSL]

PCV should have been disconnected and capped off as well. Piston rings aren't 100% air tight, but PCV would directly pressurize the case. Pressure in the case can push oil past the valve seals and cause a lot of smoke on the next start. The oil cap or VCG wasn't leaking air at that level?

Not sure how it would apply to the dust cover blowing off, the front main seal let loose and pressurize the timing case rapidly maybe?

[blaster3500]

You definitely should have capped the rear inlet to flapper. You pressurized the crankcase. Hopefully you didn’t blow any oil seals/gaskets. If you didn’t, the smoke should go away. If you pressurize the crankcase you will get smoke for a little while after.

[natedog7700]

Originally Posted by blaster3500

You definitely should have capped the rear inlet to flapper. You pressurized the crankcase. Hopefully you didn’t blow any oil seals/gaskets. If you didn’t, the smoke should go away. If you pressurize the crankcase you will get smoke for a little while after.

Any idea how much? I started it up and immediately shut it off after seeing a huge cloud of smoke. Tried starting it again and it wasn't blowing hardly anything until 15 seconds later and it started to smoke again so I shut it off once again. Smoke kind of lingered in the engine bay both times, I'm hesitant to start it again.

[natedog7700]

Originally Posted by RSL

PCV should have been disconnected and capped off as well. Piston rings aren't 100% air tight, but PCV would directly pressurize the case. Pressure in the case can push oil past the valve seals and cause a lot of smoke on the next start. The oil cap or VCG wasn't leaking air at that level?

Not sure how it would apply to the dust cover blowing off, the front main seal let loose and pressurize the timing case rapidly maybe?

So is it safe to start it again or should I have someone else look at it?

[weehe126]

The damage is done, whatever that might be. Just make sure it's not pissing oil out of anywhere and you should be fine to start it again.

[Monty.335i]

Not sure specifically what possible damage you may have done if any but when I did my boost leak test I was smoking a bit, almost two days until it went away.

[Rob09msport]

Unfortunately their are a couple you tube videos with really bad advice for our cars hopefully that cover popping scared you into stopping quick enough before anything real bad happened

[natedog7700]

Originally Posted by Rob09msport

Unfortunately their are a couple you tube videos with really bad advice for our cars hopefully that cover popping scared you into stopping quick enough before anything real bad happened

I did the same exact thing on my big turbo SRT4 so i figured it would be the same concept, boy was i wrong Live and you learn i guess...

[natedog7700]

after two weeks of letting it sit, i started it back up and no smoke came out, everything seems okay now