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Engine Discussion of preventative/corrective maintenance and other technical issues regarding your coach's engine.

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  #11  
Old 07-05-2009
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warbucks13477 warbucks13477 is offline
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Randy in my opinion that will only fix the problem for a short while. you need to not only repair the holes but also use the correct V belts. I believe Dayco makes a special belt that reduces the belt whipping which wears out the sheaves. You need to check the sheaves also, and see how far down in the groove the belt sits. It needs to sit above the sheave top.
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  #12  
Old 07-06-2009
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Quote:
Originally Posted by warbucks13477 View Post
Randy in my opinion that will only fix the problem for a short while. you need to not only repair the holes but also use the correct V belts. I believe Dayco makes a special belt that reduces the belt whipping which wears out the sheaves. You need to check the sheaves also, and see how far down in the groove the belt sits. It needs to sit above the sheave top.
A sheave (pronounced "shiv") is a wheel or roller with a groove along its edge for holding a belt, rope or cable. When hung between two supports and equipped with a belt, rope or cable, one or more sheaves make up a pulley. The words sheave and pulley are sometimes used interchangeably.
http://en.wikipedia.org/wiki/Sheave_(mechanical)
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  #13  
Old 07-06-2009
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Tom, the series 60 engine has 2 idler pulleys on the AC belts (2).
The belts are kinda long,and since everyone seems to have the same problem its either belt or vibration related.
I'm leaning towards vibration at first,and I say that because of other in-line diesels i have had in trucks that had problems with brackets and things cracking or wearing.
The brackets that failed were always the ones that were way away from the crankshaft centerline,where the vibration is the worst.

Heres how Hish described it,if you are in an earthquake and your in the first floor of a 10 story building you may not feel much,but if your on the 10th floor you will feel lots of shaking,same thing applies to the AC brackets.

Of course,the belts flopping will add to that vibration.
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  #14  
Old 07-07-2009
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I have my brackets off and carol took some pics for me,i have a plan to fix them,and they will never wear out again.
its a simple deal,and I'll try to explain it when i post the pics in a few minutes.
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  #15  
Old 07-07-2009
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heres the pics
1 & 2 are of the bracket thats good,no wear.
3 is of the worn bracket,the big hole is egg shaped
4 is other side of the worn bracket,the big hole is egg shaped.
5 is the bracket seen from the end,the big round tube in the bottom is what I ant you to look at.
6 i'm holding the round tube I want you to look at,this tube holds the bracket together,and the egg shaped holes are on the ends of that tube.

the worn bracket is held to the good bracket with a big bushing that goes through the big holes,and then a big bolt goes through the bushing and a nut holds it all together.
the holes wear out and the bushing gets big groves worn ito it.
This wear lets the sheaves or pullys get out of line and the belts jump off.
we have to figure out a way to repair the brackets.

Heres what i think i'm going to do,I'm going to bore the worn holes all the way out to the round tube,which is about 2" ID.
Then i'm going to make a bushing thats 2'' OD,that will press into the round tube.
This bushing will have a 1' hole bored in the middle of it,making it a thick walled pipe.
Then a smaller bushing thats 1"OD with a 1/2" hole will go into the first bushing.this 2nd bushing will hold the two brackets together,along with the big bolt (not pictured)
This way the outer bushing will have full contact along its length with the inner bushing,instead of the bushing only having contact in 2 narrow places,which results in the wear.

I hope you all understand this repair,trust me,this will work.
My machinest buddy is on vacation this week,but next week I will be at his shop doing my brackets.

If anybody else wants theres done,UPS the bracket to me and we will fix them.
No idea on cost,until we repair mine.
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  #16  
Old 07-07-2009
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heres a few pics i missed.

1 is the worn out bushing
2 is the bushing in the bracket
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  #17  
Old 07-07-2009
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That's what mine has done, egged the bushing. I think the actual bracket is still okay.
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  #18  
Old 07-07-2009
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Take a look at the LXi bracket. It's got a lot more steel in it. I've never had a problem with shedding belts in 100K miles.
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  #19  
Old 07-07-2009
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Randy Have you thought about boring out the bracket and then freezing a solid brass insert that will slip into the bored hole and when it cools, expand for a tight fit. Bore out the brass rod first of course to fit the bushing. drill a hole thru the bracket and brass insert for a grease fitting so you can keep it greased. This should last forever.
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  #20  
Old 07-08-2009
Hisham Amaral Hisham Amaral is offline
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Randy

The busing on my engine bracket is not that badly worn out but is does have some wear. I believe that your proposed fix will work. Please keep us informed on the progress of your bracket mods.

Hisham and Sue Amaral
97 Wanderlodge
W. Bloomfield MI.
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