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931 strange rattling sound from turbo/bov

 
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kondzi  



Joined: 02 Jul 2018
Posts: 143
Location: MZ/Poland/EU

PostPosted: Fri Oct 02, 2020 6:20 am    Post subject: 931 strange rattling sound from turbo/bov Reply with quote

If you don't drive the car daily, it breaks right?
Recently started to do some maintenance job on my 931 and this thing came out (watch with sound).

https://youtu.be/JDaZDh9CTc4

I can notice it only when idling. Did not observe anything annoying when driving the car. It shows up for few seconds, and disappears, then again 1-2 seconds rattling. Turbo is dying and resonating? Not an expert with turbochargers here.

Tried to spot where the sound comes from with a steel rod attached to my ear. It's either turbocharger case or BOV (is that correct name for the integrated valve?).

Any hints welcome.
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Konrad
'89 951 US
'88 Mustang 5.0 LX Convertible (factory specs)
'84 911 Carrera 3.2 RoW (factory specs)
'81 931 RoW (TBD)
'81 Ford Capri 2.8i (factory specs)
'79 Ford Capri 2.9 (heavily modded)
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 2104
Location: Somerset, UK

PostPosted: Fri Oct 02, 2020 9:04 am    Post subject: Reply with quote

Bov piston rattling inside the turbo. Will likely be one or both nylon washers broken down on the end caps.
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
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kondzi  



Joined: 02 Jul 2018
Posts: 143
Location: MZ/Poland/EU

PostPosted: Mon Oct 05, 2020 5:02 am    Post subject: Reply with quote

Many thanks for the hint. Will check that, just need to find some time to remove the turbo from the car.
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Konrad
'89 951 US
'88 Mustang 5.0 LX Convertible (factory specs)
'84 911 Carrera 3.2 RoW (factory specs)
'81 931 RoW (TBD)
'81 Ford Capri 2.8i (factory specs)
'79 Ford Capri 2.9 (heavily modded)
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 2130
Location: MI

PostPosted: Mon Oct 05, 2020 5:57 am    Post subject: Reply with quote

Try it without removing the whole turbo..
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 2104
Location: Somerset, UK

PostPosted: Mon Oct 05, 2020 7:28 am    Post subject: Reply with quote

Fasteddie313 wrote:
Try it without removing the whole turbo..


+1
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
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bureau13  



Joined: 07 Sep 2017
Posts: 349
Location: South Florida

PostPosted: Mon Oct 05, 2020 11:38 am    Post subject: Reply with quote

I was able to get both end caps off and replace those seals without removing the turbo. It was a pain in the butt but it can be done. Hardest part is getting the right tool on those bolts...it took several different ones. Also, there wasn't enough clearance to fully remove the piston from the valve, but it didn't really matter.
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1982 931
1986.5 Silver 928S
2007 Hummer H3 (Daily Driver)

Past lives (I miss them all):
2004 RX-8 (Wrecked)
1993 RX-7 (Sold)
1987 RX-7 Turbo II (Sold)
1985 RX-7 GSL (Stolen)
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kondzi  



Joined: 02 Jul 2018
Posts: 143
Location: MZ/Poland/EU

PostPosted: Mon Oct 05, 2020 8:40 pm    Post subject: Reply with quote

Iíll give it a try, but Iím 6,5ft tall and not the thinnest one Sometimes itís just impossible to put my hands into some corners.
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Konrad
'89 951 US
'88 Mustang 5.0 LX Convertible (factory specs)
'84 911 Carrera 3.2 RoW (factory specs)
'81 931 RoW (TBD)
'81 Ford Capri 2.8i (factory specs)
'79 Ford Capri 2.9 (heavily modded)
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 2104
Location: Somerset, UK

PostPosted: Mon Oct 05, 2020 10:10 pm    Post subject: Reply with quote

I found it easy to remove the cap on the chassis rail side plus the piston and spring. I gave up with the cap on the engine side

Despite having brand new nylon washers on both caps after a full turbo rebuild, I endured the rattle for a few months. It finally went away after removing the piston and spring and stretching the spring a little to tighten it all up to avoid the rattle.

Taking the turbo off will take you at least 4-6hrs off and the same back on. So that's the last resort. Plus you will open up new issues by removing
_________________
1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
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kondzi  



Joined: 02 Jul 2018
Posts: 143
Location: MZ/Poland/EU

PostPosted: Tue Oct 06, 2020 11:45 pm    Post subject: Reply with quote

Iím not afraid of time consuming works, not after I did clutch in my late 951 Just finished wheel bearings all corners and big brakes. BOV needs to wait a bit. Will let you know how it goes with BOV.
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Konrad
'89 951 US
'88 Mustang 5.0 LX Convertible (factory specs)
'84 911 Carrera 3.2 RoW (factory specs)
'81 931 RoW (TBD)
'81 Ford Capri 2.8i (factory specs)
'79 Ford Capri 2.9 (heavily modded)
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 2130
Location: MI

PostPosted: Wed Oct 07, 2020 1:17 am    Post subject: Reply with quote

I forget if you have had your turbo out before..
How much of a ‚Äúwhile your in there‚ÄĚ list do you want?

Great time to refresh the HG even
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kondzi  



Joined: 02 Jul 2018
Posts: 143
Location: MZ/Poland/EU

PostPosted: Wed Oct 07, 2020 2:31 am    Post subject: Reply with quote

HG? What that stands for?
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Konrad
'89 951 US
'88 Mustang 5.0 LX Convertible (factory specs)
'84 911 Carrera 3.2 RoW (factory specs)
'81 931 RoW (TBD)
'81 Ford Capri 2.8i (factory specs)
'79 Ford Capri 2.9 (heavily modded)
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 2130
Location: MI

PostPosted: Thu Oct 08, 2020 3:37 am    Post subject: Reply with quote

Head gasket
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