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Old 05-17-2018, 01:57 PM   #1
lummert
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Default TD04H-13C compressor bypass valve symptoms

My turbo started whining yesterday. Today it is howling. Not making boost. Is this the cbv diaphragm? Turbo is the later type TD04H-13C-6 as used on a later model 940. It has the diaphragm type valve.
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Old 05-17-2018, 02:33 PM   #2
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3 bolts to take it off and check.


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Old 05-17-2018, 03:53 PM   #3
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In answer to my own question: The compressor wheel has way too much side to side play. Noise is most likely the compressor wheel making contact with the housing.
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Old 05-17-2018, 05:25 PM   #4
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Now since I don't have access to another TD04H turbo I'm going to look at installing the good original TD05-12B on the 90+ exhaust manifold.

Last edited by lummert; 05-17-2018 at 07:08 PM..
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Old 05-17-2018, 10:58 PM   #5
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If you are interested in a good used 13C, shoot me a PM.
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Old 05-18-2018, 06:22 PM   #6
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Can I prevent boost by disconnecting the wastegate actuator? I had previously adjusted the actuator for more boost with one washer on each bolt between compressor housing and the actuator. I don't think that removing the washers will temporarily prevent enough boost. The boost comes on above idle and causes plenty of smoke and noise. It is bad enough that it shouldn't be driven until it is fixed. I need to get around town long enough to get the parts together.
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Old 05-18-2018, 06:31 PM   #7
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If you physically remove the wastegate actuator and wire the wastegate flap OPEN you will prevent the turbo from building much boost.
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Old 05-18-2018, 07:03 PM   #8
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Quote:
Originally Posted by oldschoolvolvo View Post
If you physically remove the wastegate actuator and wire the wastegate flap OPEN you will prevent the turbo from building much boost.
That's what I need to do.
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Old 05-18-2018, 07:26 PM   #9
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if the compressor blades are hitting the housing you're sucking metal particulate into your engine. i wouldn't drive it imo
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Old 05-18-2018, 09:16 PM   #10
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^^ good point
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Old 05-19-2018, 08:42 AM   #11
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Quote:
Originally Posted by esmth View Post
if the compressor blades are hitting the housing you're sucking metal particulate into your engine. i wouldn't drive it imo
meh, the metal parts would have to pass through the tiny channels of the intercooler and then magically fly up to the intake tube on their way to the throttle body.

unlikely, i'm not seeing that happening.
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Old 05-19-2018, 03:12 PM   #12
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This morning before it started raining I managed to remove the wastegate actuator and wire the wastegate wide open. No more boost, no more noise. Still have the smoke from oil getting past the turbo seals. I managed to source some transitioning studs (M8x1.25 to M10x1.5) for the TD05-12b to 90+ manifold install at NAPA.

Last edited by lummert; 05-19-2018 at 03:20 PM..
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Old 05-19-2018, 07:57 PM   #13
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I don't know if it helps you, but I have a 13G from a V70 that you could have for the cost of shipping. It builds boost fine but it does use oil so I would recommend a rebuild kit.
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Old 05-20-2018, 09:21 PM   #14
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Quote:
Originally Posted by ovlov760 View Post
I don't know if it helps you, but I have a 13G from a V70 that you could have for the cost of shipping. It builds boost fine but it does use oil so I would recommend a rebuild kit.
I'm going to try putting the TD05-12b back on.
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Old 05-20-2018, 09:26 PM   #15
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Today after having a friend remove a broken stud from the turbine housing exhaust flange I went to pull out on the highway and my car smoked so badly that a truck a quarter mile down the road had to pull over because of the smoke screen. The engine severely misfired until the cloud cleared. I'm guessing I shouldn't try driving in traffic.
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Old Yesterday, 08:07 AM   #16
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Quote:
Originally Posted by lummert View Post
Today after having a friend remove a broken stud from the turbine housing exhaust flange I went to pull out on the highway and my car smoked so badly that a truck a quarter mile down the road had to pull over because of the smoke screen. The engine severely misfired until the cloud cleared. I'm guessing I shouldn't try driving in traffic.
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