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06-07-2011, 08:05 AM
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#1
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Junior Member
Join Date: Jun 2011
Posts: 22
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Allison vibration
My 45' Monaco is shuttering when the RPM's drop to around 1300 waiting for a downshift. If I manually downshift it goes away. My question is, has anyone experienced this problem? Could it be a engine problem rather than the transmission? I have changed both fuel filters.
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06-07-2011, 08:19 PM
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#2
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Senior Member
Triple E Owners Club
Join Date: Aug 2010
Location: Pacific Northwest
Posts: 732
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When was the last time you serviced the tranny?
__________________
1997 Triple E Empress, Freightliner Chassis, CAT 3126 w/ 275 horse's.
MD 3600 Tranny, 2011 Ford Escape Hybrid w/Blue Ox tow bar and Roadmaster Base Plate.
Amsoil Synthetic Oil only for my baby.
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06-08-2011, 09:43 AM
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#3
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Junior Member
Join Date: Jun 2011
Posts: 22
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Coach is an 09 Monaco w/28K miles. Unless I'm mistaken, tranny is not due for service.
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06-08-2011, 07:50 PM
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#4
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Senior Member
Join Date: Nov 2008
Location: Cosby, Tn
Posts: 6,587
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How are you aware of this shutter? Can you feel it in the steering or actually in the body of the motorhome as a "shaking"? Or is it something you hear. Is it between every downshift or just certain gears? Is it during heavy throttle conditions or any downshift?
A couple of years ago I did not lube my drivetrain for about 10K miles and I started noticing a vibration at a certain speed in a certain gear. I lubed my U joints and drive shaft spline and it went away.
If you are concerned and it continues, you are still under warranty on both engine and transmission. A trip to a Cummins or Allison dealer might be the best.
__________________
Steve Ownby
Full time since 2007
2003 Monaco Signature
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06-09-2011, 08:48 AM
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#5
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Junior Member
Join Date: Jun 2011
Posts: 22
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Thanks for the reply Steve, I have already taken the coach to the dealer
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06-11-2011, 07:36 AM
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#6
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Senior Member
Workhorse Chassis Owner
Join Date: Sep 2007
Location: st.charles mo.
Posts: 1,482
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I would have the ride height checked. These units have a very short drive shaft and any missalighnment can cause this problem.
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06-11-2011, 07:51 AM
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#7
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Senior Member
Join Date: Aug 2006
Posts: 799
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I agree with the drive shaft theory. If the U joints or slip joint get dry you will get the vibration. I know.
__________________
2005 Dutch Star 4015
Cummins ISL
2007 Honda CR-V
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06-12-2011, 09:13 AM
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#8
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Junior Member
Join Date: Jun 2011
Posts: 22
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Turns out I had a bad injector on the motor. That explains the loss of power and fuel mileage, nto to mention the shudder.
Thanks to everyone for their responses.
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06-12-2011, 10:49 AM
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#9
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Community Administrator
Fleetwood Owners Club Workhorse Chassis Owner
Join Date: Sep 2010
Location: Marquette, Michigan "Da UP" & Lehigh Acres Florida
Posts: 21,822
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Quote:
Originally Posted by RJohn
Turns out I had a bad injector on the motor. That explains the loss of power and fuel mileage, nto to mention the shudder.
Thanks to everyone for their responses.
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Thank you for the update, many times like this one I think the outcome is just as valuable or more so than the original question.
__________________
John & Cathy R.
06 Pace Arrow 38L Workhorse W24
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06-17-2011, 02:52 PM
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#10
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Senior Member
Commercial Member
Join Date: Apr 2011
Location: Avon, IN
Posts: 706
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Quote:
Originally Posted by RJohn
Turns out I had a bad injector on the motor. That explains the loss of power and fuel mileage, nto to mention the shudder.
Thanks to everyone for their responses.
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John,
Just to follow up. You might want to check your engine oil using oil analysis. There's a good chance the injector was bleeding fuel into the oil. When this happens, it lowers the oil viscosity and can produce wear if left unchecked.
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06-17-2011, 05:50 PM
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#11
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Senior Member
Triple E Owners Club
Join Date: Aug 2010
Location: Pacific Northwest
Posts: 732
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Quote:
Originally Posted by hzjcm8
John,
Just to follow up. You might want to check your engine oil using oil analysis. There's a good chance the injector was bleeding fuel into the oil. When this happens, it lowers the oil viscosity and can produce wear if left unchecked.
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You are right John. Since 2007 due to the EPA regulation this has been a problem on diesel engines. Thanks for the heads up. I do an engine analysis every year. Shoot for $15.00, why not.
__________________
1997 Triple E Empress, Freightliner Chassis, CAT 3126 w/ 275 horse's.
MD 3600 Tranny, 2011 Ford Escape Hybrid w/Blue Ox tow bar and Roadmaster Base Plate.
Amsoil Synthetic Oil only for my baby.
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