LateApex
10-14-2022, 12:18 PM
I have the standard Moser 8.8" 3-link rear on my coupe. How much noise is "normal" for this gear on gear design?
I have a grand total of 450 miles on the coupe since getting some tags. I am babying the car, or "breaking it in", tweaking alignment etc, and running up and down some of the local canyons. Very impressed with handling and balance, ..., etc.
Yesterday I am running down a concrete road, with the usual seams every 20' and the typical pitching like a carnival ride that comes with concrete roads over expansive clay soils. I starting noticing a serious clanging (over the sound of the exhaust. ) To the extent I pulled over to make sure I wasn't bouncing a side pipe down the road. The sound appears to be coming from the rear. Can't find a thing. I ease onto a black top road and head for home and shop. On that black top, the racket disappears.
Hmmm ... Up on the stands, everything is tight, from suspension fasteners to to U-joint bolts and brake calipers. The only thing I notice is what seems like excessive axle lash and end-play. I contact Moser for good measure this morning. And the basic answer I get is "Some end play is normal (maybe 3/32" in my case?), the gear on gear design comes with some gear noise, and measuring lash is challenging." When I was looking at play, with the car on the stands, I can dither one wheel and guestimate how far I can rotate before other components, like the other wheel and driveshaft move. That too is about 3/32", as measured at brake disc rim, which is about 1/4" at tire diameter.
I am guessing that this amount of play is pretty typical.
I am at a bit of a loss to explain how a pumpkin full of gear oil can clash gears enough to sound like one is dropping metal on the highway. So this is probably a red herring. Have others had this experience though?
And yes, there is a slight weep through the cover gasket too (yep, seen those threads ;-)
Back to crawling around on the shop floor. Going to check exhaust inserts next ....
I have a grand total of 450 miles on the coupe since getting some tags. I am babying the car, or "breaking it in", tweaking alignment etc, and running up and down some of the local canyons. Very impressed with handling and balance, ..., etc.
Yesterday I am running down a concrete road, with the usual seams every 20' and the typical pitching like a carnival ride that comes with concrete roads over expansive clay soils. I starting noticing a serious clanging (over the sound of the exhaust. ) To the extent I pulled over to make sure I wasn't bouncing a side pipe down the road. The sound appears to be coming from the rear. Can't find a thing. I ease onto a black top road and head for home and shop. On that black top, the racket disappears.
Hmmm ... Up on the stands, everything is tight, from suspension fasteners to to U-joint bolts and brake calipers. The only thing I notice is what seems like excessive axle lash and end-play. I contact Moser for good measure this morning. And the basic answer I get is "Some end play is normal (maybe 3/32" in my case?), the gear on gear design comes with some gear noise, and measuring lash is challenging." When I was looking at play, with the car on the stands, I can dither one wheel and guestimate how far I can rotate before other components, like the other wheel and driveshaft move. That too is about 3/32", as measured at brake disc rim, which is about 1/4" at tire diameter.
I am guessing that this amount of play is pretty typical.
I am at a bit of a loss to explain how a pumpkin full of gear oil can clash gears enough to sound like one is dropping metal on the highway. So this is probably a red herring. Have others had this experience though?
And yes, there is a slight weep through the cover gasket too (yep, seen those threads ;-)
Back to crawling around on the shop floor. Going to check exhaust inserts next ....