Supercharger Rattle but only in gear - TundraTalk.net - Toyota Tundra Discussion Forum

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post #1 of 48 (permalink) Old 08-24-2016, 11:18 PM Thread Starter
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Supercharger Rattle but only in gear

I have what I think sounds like a bad bearing in my supercharger. Sounds like rocks rattling around in a can. The trouble is I have just had the supercharger rebuilt (2x). My truck has 111K mile on it so i sent it off for a rebuild. It previously had no issues. I got the blower back and it seemed to develop a noise. I had it pulled again and sent back to the re builder. I have had it back on the truck for a few miles and the noise is still there.

The noise is only present in gear (drive or park) and goes away when the rpm increase when you put the truck into neutral or apply throttle.

This doesn't seem consistent with a bad bearing does it? any other ideas?

On the second rebuild they said there was a bad seal on the rear which was their fault so the warrantied the rebuild. They did find moisture in the drive snout. The case needle bearing and coupler had rust so the replaced them. They said they had never seen this before and that there isn't anyway for moisture to get in there. Is it possible the bearing is rusty again. The first time there was maybe 1K miles put on it and now maybe a couple hundred.
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post #2 of 48 (permalink) Old 08-25-2016, 11:32 AM
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sounds like a load of bs from rebuilder.
if they really found moisture within 1000 mi of you using it they would've blamed you for that.
get them to check the rear bearings,gear backlash and rotor timing,the 2 needle bearings on intake side and the shape of the bearing journals on rotor shafts.the coupler prongs,alignment.proper press fit and the coupler and snout bearings.something is definitely not right with their method if your s/c had no symptoms before you sent it in the first time.
these s/c are not black magic units and have preciously few parts.this is not rocket science.
who did the work?
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post #3 of 48 (permalink) Old 08-25-2016, 09:37 PM Thread Starter
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It was a reputable re-builder who has been named on these forms a number of times. I'm hesitant to throw them under the bus until i can prove it was their workmanship.

If a bearing is bad I don't understand why would it only make noise at ~650RPM at idle when drive or park but not at the ~750rpm when at idle in neutral?

I had a bad jack shaft bearing in my old CTS-V with a maggie (MP112) that was always noisy... regardless of rpm.
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post #4 of 48 (permalink) Old 08-25-2016, 10:56 PM
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same boat as you bud. had it rebuilt multiple times by the same guy. i got same verbatim excuses as the ones i'm reading from your posts. I would buy a new s/c assembly unit right now if I could. straight up.
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post #5 of 48 (permalink) Old 08-25-2016, 10:57 PM
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Supercharger Rattle but only in gear

Maybe @MagnusonSuperchargers can help
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post #6 of 48 (permalink) Old 08-26-2016, 10:48 AM Thread Starter
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same boat as you bud. had it rebuilt multiple times by the same guy. i got same verbatim excuses as the ones i'm reading from your posts. I would buy a new s/c assembly unit right now if I could. straight up.
Thanks for the PM.... boostedtundra and I have the same re-builder which is scary. I'll give magnusson a call and see what they have to say. They rebuilt the one from my old CTS-V and did good work. Obviosuly should have sent it there in the first place.....
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post #7 of 48 (permalink) Old 08-26-2016, 11:03 AM
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the rattle can be due to oscillations in the crankshaft at low rpm.each firing stroke jolts the crank a bit and the s/c picks it up.this is why shop that use electric motors for testing never run into this issue.
if backlash in gears is a bit too much then the 2 rotors vibrate while being driven slow.also since there is no boost,the rotors are kind of floating between the 2 journals under no load and can rock back and forth lightly bumping into each other.
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post #8 of 48 (permalink) Old 08-26-2016, 11:10 AM
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Hey guys, we can take a look at out of warranty units. We have an inspection fee and if we end up doing the rebuild we will waive the inspection fee.

Not sure who rebuilt the unit for you but we obviously have all the original spec parts and assembly procedures. We also have a complete test stand and will run the unit after the repair, to make sure the problem is solved.

Give us a call at 805 642 8833 x223. We'll have you fill out a form to get things rolling,,,, if you are interested.

Thanks from the Magnuson Team!
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post #9 of 48 (permalink) Old 08-26-2016, 03:12 PM Thread Starter
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Originally Posted by MagnusonSuperchargers View Post
Hey guys, we can take a look at out of warranty units. We have an inspection fee and if we end up doing the rebuild we will waive the inspection fee.

Not sure who rebuilt the unit for you but we obviously have all the original spec parts and assembly procedures. We also have a complete test stand and will run the unit after the repair, to make sure the problem is solved.

Give us a call at 805 642 8833 x223. We'll have you fill out a form to get things rolling,,,, if you are interested.

Thanks from the Magnuson Team!
I have left you a VM.......
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post #10 of 48 (permalink) Old 08-28-2016, 06:55 PM
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Supercharger rattle at idle???? Here is the fix! - Toyota Tundra Forums : Tundra Solutions Forum


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post #11 of 48 (permalink) Old 09-03-2016, 12:36 PM Thread Starter
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The coupler was replaced during the first rebuild. Idler pulley has been replaced as well just to make sure.

The blower is off for the third time in a couple thousand miles. The re builder has been good about not giving me grief or excuses but at the same time I sure wish it would have been done properly the first time....... They are picking up the freight as well.

My guess is restosud's theory is correct.

I'll give them one more chance, after that it's going to magnuson or maybe I'll buy a new s/c assembly from magnuson.
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post #12 of 48 (permalink) Old 09-03-2016, 12:45 PM
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Keep us posted an hope you get it corrected


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post #13 of 48 (permalink) Old 09-17-2016, 06:14 PM Thread Starter
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I heard back from the rebuilder. They said there is oil and dirt in the manifold as well as water in the drive snout, moisture in the drive snout coupler causing rust. I have not recieved an explaination as to why this could be. The only help is that the "issue is outside of the supercharger"

If that's the case, can anyone help me with what might be wrong with my truck? Why would moisture be getting into the snout coupler? My truck never sees anything other than highway driving.

I had 120 000 problem free miles before this "preventative maintenance" rebuild. Now I can't get more the 1000 miles out of it. Pretty frustrating.
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post #14 of 48 (permalink) Old 09-17-2016, 09:02 PM
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ask for pictures.there is no reason for water to be in the snout at all other than possible small amount due to condensation.even so,it should last longer than what you stated unless it's fully submerged.
is it just water or coolant?
a bit of surface rust on the coupler will not make it rattle.
something is not adding up.
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post #15 of 48 (permalink) Old 09-17-2016, 09:41 PM
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There will be surface rust in the area of the coupler. That's common. There was in mine.

This will not cause a rattle.

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