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Rough Noise Coming From Red Boost Hose Area
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11-04-2018, 05:35 PM | #1 |
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The other day I noticed at about 3k rpm a sound that almost sounded like an exhaust rattle or leak but it's not noticeable below about 3k rpm. When I had the hood up while someone else throttled up, it sounded like it was coming from the turbo and red boost hose area.
The hose was fairly well covered in oil and when I had the IC out, the hose felt really loose, I could turn it easily. Iv researched this problem but haven't come across anyone saying a symptom being this kind of noise but I would imagine there would be some kind of noise coming from there is the hose is that loose. Anyone have any thoughts on this? BTW I already ordered the Forge hose. |
11-16-2018, 09:09 PM | #2 | |
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Will update again after I hear back from the dealer. |
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11-30-2018, 09:49 PM | #3 |
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Update
Beside the boost hose that I replaced, I had the dealer replace the crankshaft pulley and both belts but the noise remains. Dealer then took off the pulley and the noise goes away but is back with the pulley on. They also inspected the oil filter but did not find any metal debris but said when they listen with a scope, they hear the noise from the crankcase. Now they will ask the area BMW technical rep for insight because they can't figure it after 2 weeks. Car only has 61k miles and hasn't had any oil pressure issues so I can't imagine it's related to a crank/rod/bearing etc. Any insight would be greatly appreciated. Thanks |
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12-04-2018, 09:54 PM | #5 |
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12-05-2018, 10:18 AM | #6 |
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Just heard back from my SA.
According to him, the BMW area technical rep believes the issue is with the main bearing. The dealer wants to replace the engine! Hilarious! The noise is not that bad so I can't imagine the damage is severe enough to warrant an engine replacement. Thoughts? |
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12-05-2018, 12:28 PM | #7 |
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Hard to say exactly what the noise is, I know the tensioner can rattle pretty good if it has bit the dust but that seems pretty rare on this engine. Would be an easy test of just removing the belt and see if the noise persists and feeling for play in the pulleys. Might be worth taking it to an independent BMW mechanic for a second opinion.
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12-06-2018, 09:10 PM | #8 | |
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So frustrated. I really like this car but I'v had so many issues with it, all the common stuff with the 335d but this is a major kick in the balls. |
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12-28-2018, 09:36 AM | #11 |
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12-28-2018, 11:56 AM | #12 |
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Yes, one chain from crank to hpfp. Another chain From hpfp to cam.
Without any belts on, is it noisy? I'm still confused ... If it was quiet without the pulley/no belts, it means that the noise is from something in the belt loops... Ac perhaps, or idler or alt or water pump ... Why didn't they check those instead of focus on the main bearing? Dumb dealer |
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12-28-2018, 02:17 PM | #13 | |
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I had them change both belts so I would think they would have noticed if any pulley or tensioner was the cause. According to them they heard the noise from the crankcase after listening with a stethoscope. They even asked the area BMW technical rep to check it out. I should know by tomorrow the condition of the chain. |
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12-28-2018, 09:43 PM | #14 |
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The weight of the pulley shouldn't be what causes noise if it was a main bearing. Did they run it with the pulley and no belts attached? I still don't understand but these dealers will bs over and over because the sa is usually a salesman, not one who ever wrenched on a car.
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12-28-2018, 10:32 PM | #15 |
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Ya its not making much sense to be honest, the pulley is balanced and shouldn't affect the crank if there are no belts attached. I would have started with the other bearings on the front of the engine as well as the tensioner.
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01-15-2019, 06:41 PM | #16 |
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So the indy shop I have the car at is telling the first main bearing, closest to the harmonic balancer has spun. But he's not concerned about any block damage. Wouldn't there be serious damage with a spun main bearing?
Bearing cap is apparently also damaged but we can't find just the caps. This is all after they replaced the timing chain which they said was stretched. The shop is reputable and had a lot of good reviews for bmw work in the Chicago area. I just don't know what to think of everything right now. Haven't had my car for 2 months between the dealer and this shop. Help! |
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01-16-2019, 08:39 AM | #17 | |
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01-16-2019, 09:07 AM | #18 | ||
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Here are the pics of the bearing and cap |
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01-16-2019, 09:10 AM | #19 |
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depending on the damage.. if the rest of the motor is solid and the bad parts can be replaced then replacing the motor would be overkill. A spun bearing is not the end of the world for the motor.. they make bearings in all different sizes.
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01-16-2019, 09:24 AM | #20 |
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FYI to all, I'm also posting about this in another related thread. Will probably just stick with that one from now.
UPDATED - Engine Swap - 335D Crankshaft Main Bearings and Bolts Question https://www.e90post.com/forums/showthread.php?t=1491850 |
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01-16-2019, 05:34 PM | #21 |
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Yeah, well I responded under impression OP was tackling this at indy shop. There is a very possible scenario the block and crankshaft need to be addressed as well as bearings.
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