|
|
|
|
|
|
BMW Garage | BMW Meets | Register | Today's Posts | Search |
|
BMW 3-Series (E90 E92) Forum
>
Did i just blow a head gasket or something?
|
|
09-09-2018, 12:04 PM | #1 |
Captain
663
Rep 780
Posts |
Did i just blow a head gasket or something?
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?
|
09-09-2018, 01:42 PM | #2 |
Lieutenant
391
Rep 532
Posts |
Last edited by JM98; 03-16-2020 at 05:42 PM.. |
Appreciate
0
|
09-09-2018, 04:01 PM | #3 | |
Captain
663
Rep 780
Posts |
Quote:
|
|
Appreciate
0
|
09-09-2018, 07:09 PM | #5 |
Captain
663
Rep 780
Posts |
|
Appreciate
0
|
09-09-2018, 07:35 PM | #8 |
Captain
648
Rep 779
Posts |
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? |
09-09-2018, 09:13 PM | #9 |
Lieutenant
143
Rep 567
Posts |
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.
__________________
07 335 6MT
|
09-10-2018, 01:30 PM | #10 |
Captain
663
Rep 780
Posts |
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.
|
Appreciate
0
|
09-10-2018, 02:15 PM | #11 | |
Captain
663
Rep 780
Posts |
Quote:
|
|
Appreciate
0
|
09-11-2018, 01:03 PM | #13 |
Enlisted Member
9
Rep 32
Posts |
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.
|
09-11-2018, 03:59 PM | #14 |
Lieutenant
128
Rep 487
Posts |
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
|
Appreciate
0
|
09-11-2018, 06:53 PM | #15 |
Captain
663
Rep 780
Posts |
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...
|
Appreciate
0
|
Bookmarks |
|
|