Roots Rattle Returns
#1
06-19-2006, 03:36 PM
Roots Rattle Returns
Hey Everybody! Got a question.....
1999 F150 4.6 with a Allen (Magnacharger) M90 Eaton roots blower purchased slightly used, then installed and used for over 70,000 miles.
In the engine bay, I have a rattle or tapping sound that is louder at idle and quieter at higher revs. I am trying to trace the source of the sound. In the past when this happened, it was a worn pulley or loose bracket.
It sounds like it is coming from the Eaton M90 nose cone area. I can feel the rattle sound vibration when I touch the M90 nose cone or the top bracket holding the nose cone. I recently changed the altenator and went back and made sure it was tightened down.
Anyone have a similar rattle and what was the cause? Thanks!
1999 F150 4.6 with a Allen (Magnacharger) M90 Eaton roots blower purchased slightly used, then installed and used for over 70,000 miles.
In the engine bay, I have a rattle or tapping sound that is louder at idle and quieter at higher revs. I am trying to trace the source of the sound. In the past when this happened, it was a worn pulley or loose bracket.
It sounds like it is coming from the Eaton M90 nose cone area. I can feel the rattle sound vibration when I touch the M90 nose cone or the top bracket holding the nose cone. I recently changed the altenator and went back and made sure it was tightened down.
Anyone have a similar rattle and what was the cause? Thanks!
#2
06-22-2006, 01:28 PM
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Originally Posted by iron horse
Hey Everybody! Got a question.....
1999 F150 4.6 with a Allen (Magnacharger) M90 Eaton roots blower purchased slightly used, then installed and used for over 70,000 miles.
In the engine bay, I have a rattle or tapping sound that is louder at idle and quieter at higher revs. I am trying to trace the source of the sound. In the past when this happened, it was a worn pulley or loose bracket.
It sounds like it is coming from the Eaton M90 nose cone area. I can feel the rattle sound vibration when I touch the M90 nose cone or the top bracket holding the nose cone. I recently changed the altenator and went back and made sure it was tightened down.
Anyone have a similar rattle and what was the cause? Thanks!
1999 F150 4.6 with a Allen (Magnacharger) M90 Eaton roots blower purchased slightly used, then installed and used for over 70,000 miles.
In the engine bay, I have a rattle or tapping sound that is louder at idle and quieter at higher revs. I am trying to trace the source of the sound. In the past when this happened, it was a worn pulley or loose bracket.
It sounds like it is coming from the Eaton M90 nose cone area. I can feel the rattle sound vibration when I touch the M90 nose cone or the top bracket holding the nose cone. I recently changed the altenator and went back and made sure it was tightened down.
Anyone have a similar rattle and what was the cause? Thanks!
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06-23-2006, 12:41 PM
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#7
06-24-2006, 12:35 AM
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As noted above it could be a tensioner or tensioner pulley going bad.. I would check that first. If that checks out OK remove the belt from the blower pulley and see if there is any "play" in the pulley by rocking it back and forth by hand. If there is play it could be the coupler going bad.
I had to change the one on my Buick GS (M90) at 70k miles. Pretty straight forward to change it. The only tough bolt was the one that couldn't been seen at the six o' clock position of the blower.
These are the instructions I used.. of course there for a Buick but, it's the same blower.. http://www.regalgs.org/coupler.shtml.
You can get the coupler here: http://www.intense-racing.com/
Go to "Store", then "GM3800", and then "Induction". Whatever you need should be there for the M90.
Hope that helps...
** One more thing... If you DO change the coupler.. prior to taking the snout off stuff paper towels in every nook and crany you can. You can't pump all of the oil out and what little is left goes everywhere!! It'll save you from a stinky mess.
I had to change the one on my Buick GS (M90) at 70k miles. Pretty straight forward to change it. The only tough bolt was the one that couldn't been seen at the six o' clock position of the blower.
These are the instructions I used.. of course there for a Buick but, it's the same blower.. http://www.regalgs.org/coupler.shtml.
You can get the coupler here: http://www.intense-racing.com/
Go to "Store", then "GM3800", and then "Induction". Whatever you need should be there for the M90.
Hope that helps...
** One more thing... If you DO change the coupler.. prior to taking the snout off stuff paper towels in every nook and crany you can. You can't pump all of the oil out and what little is left goes everywhere!! It'll save you from a stinky mess.
Last edited by 207; 06-24-2006 at 12:40 AM.