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Author Topic: vibration at speed !  (Read 1723 times)
OneLapper
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« Reply #15 on: October 14, 2013, 12:12:27 PM »

I had the same vibration on my 4106.  After doing all the normal stuff it turned out to be worn spline shaft on the drive shaft.  At higher speeds the sloppy shaft swung like two people using a jump rope.  It didn't move much, 1/4" at most, but it was enough to cause the entire coach to vibrate.

I put a new driveshaft in and it's been smooth as 25,000 pounds of silk going down the road ever since.

Mark
« Last Edit: October 15, 2013, 10:02:43 AM by OneLapper » Logged

OneLapper
1964 PD4106-2853
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TomC
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« Reply #16 on: October 15, 2013, 08:42:20 AM »

Drive at 65mph (LOL). Pull the drive shaft and inspect off the bus along with the Ujoints. Ujoints are not very expensive. Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
Lee Bradley
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« Reply #17 on: October 16, 2013, 11:28:36 AM »

I find it odd that the bus has to warm up before the vibration starts.  Could be a rubber mount that is not controlling a rotating load that as it gets warmer or a shaft that is losing alignment
as it warms; pinion shaft? But it does sound like a road speed vibration vs engine speed vibration; engine speed vibration would show up at a given rpm in each gear or out of gear. I'm with TomC the u-joints should be checked disconnected; most failures are from seized bearings that will not be detected by wiggling the shaft.
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sledhead
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« Reply #18 on: October 16, 2013, 03:11:31 PM »

Ya at 65 mph and 1650 rpm smooooooth ride but every now and then you need to clean out the carbon .                   dave
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1990 mci 102c  6v92 ta ht740  kit,living room slide . home base huntsville ontario canada
TomC
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« Reply #19 on: October 17, 2013, 10:01:52 AM »

Every time you go up a hill you're cleaning out the carbon. Good luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
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