|
Post Reply |
|
Thread Tools | Search this Thread |
09-15-2021, 10:27 PM | #1 |
Lieutenant
298
Rep 584
Posts |
Replaced valve cover and I still get that distinctive squeal. What now?
I was getting that very distinctive squeal that's the hallmark of a bad PCV valve. Just like every description, it would go away when opening the oil fill cap. I replaced the entire valve cover and it's still making that sound! If it's not the stupid expensive fix for the PCV them what could be causing this?
Edit to update: Replaced the valve cover again, also replaced the crankcase vent hose, and the squeal went away. If you're replacing the valve cover I'd recommend replacing the hose as well. I cut the insulation off my old one and the hose inside was cracked and came completely apart with very little flexing. https://www.fcpeuro.com/products/bmw...mw-11127850244 Last edited by Tangent; 10-10-2022 at 11:58 AM.. |
09-16-2021, 06:19 AM | #2 |
Lieutenant
871
Rep 433
Posts |
Do you hear it louder under the car?
|
Appreciate
0
|
09-16-2021, 09:41 AM | #3 |
Lieutenant
298
Rep 584
Posts |
Yup, it seems loudest in the right location to be the rear main seal making the noise. But with the PCV valve replaced there shouldn't be an overpressure making it do that should there? Or are they known to get damaged quickly enough from that that even normal pressures will do it afterwards? I'm hoping there's something else still causing excess pressure that can fix this without the labor involved with replacing the RMS...
|
Appreciate
0
|
09-16-2021, 09:54 AM | #4 | |
Lieutenant
871
Rep 433
Posts |
Quote:
|
|
Appreciate
0
|
09-16-2021, 12:36 PM | #5 |
Lieutenant
298
Rep 584
Posts |
I'll check that out. With a properly working PCV system would there still be enough pressure in there to cause that squeal though?
|
Appreciate
0
|
09-16-2021, 12:39 PM | #6 | |
Lieutenant
871
Rep 433
Posts |
Quote:
There is also a seal around the crank hub on the N55, but im not sure about the S55 (too new to me). I've never heard or seen that seal go due to PCV, it usually goes when the main belt slips off and shreds into the engine thru that seal. |
|
Appreciate
0
|
10-10-2022, 11:56 AM | #8 |
Lieutenant
298
Rep 584
Posts |
I think what actually finally fixed it was replacing the crankcase vent hose on the front of the valve cover. I replaced the valve cover itself again (gotta love FCP Euro's warranty) but also replaced the hose and the noise went away. When I cut the insulation away from the old hose the inside was cracked and came completely apart with very little flexing.
https://www.fcpeuro.com/products/bmw...mw-11127850244 |
Appreciate
0
|
10-10-2022, 01:05 PM | #9 | |
Major General
5460
Rep 5,153
Posts |
Quote:
Gotta add that to the find-a-squeal checklist.
__________________
'18 F80 Base 6MT | '19 F82 Exec DCT | '18 F82 Comp Exec DCT | '23 G80cx
|
|
Appreciate
0
|
10-11-2022, 12:06 PM | #10 |
Lieutenant
298
Rep 584
Posts |
It wasn't coming from the crack, I think the fact that it was cracked was causing the PCV to not function correctly so it was still squealing from the RMS like a failed PCV valve would. I suspect that at least some PCV failures are actually caused by this hose cracking.
|
Appreciate
1
TopJimmy5460.00 |
Post Reply |
Bookmarks |
|
|