| Author |
Message |
TWODOGS (Twodogs)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, April 17, 2005 - 9:02 pm: | |
I have an 05 Eagle & it has a three shiv pulley turning the bus alternaton...question is...I'm changeing the belts & they are 3/8th belts...looks like a 1/2 belt should go there...what do you Eagle guys got 3/8 or 1/2 |
John that newguy
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, April 17, 2005 - 9:04 pm: | |
That with, or without the rust? |
TWODOGS (Twodogs)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, April 17, 2005 - 9:09 pm: | |
we are going to have a race someday jtng |
DrDave
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, April 17, 2005 - 10:26 pm: | |
I hope you are measuring that 3/8 at the bottom of the groove... Measure the top of the groove. Your belts should be 1/2" and ride initially just about even or a little below the widest part of the groove. Never saw any alternator with 3/8" wide belts on a bus or truck engine. |
TWODOGS (Twodogs)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, April 18, 2005 - 6:12 am: | |
I thought more Eagle guys would awnser ...the ones that were on it are 3/8....the shiv looks like a 1/2" belt should go there |
Jim Shepherd (Rv_safetyman)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, April 18, 2005 - 8:22 am: | |
TD, I am assuming that you are talking about accessory drive belts on the engine rather than the fan drive belts given all of the threads on your electric cooling fans <grin>.
HC38 belts (3/8 top width) are only used on automotive applications and most of those have gone to HC47 belts. Trucks (and I would guess busses) would used wider belts. They tended to use the older SAE sections which are designated with fractions. Many used 11/16 and 3/4 belts in the older days. Because of better belt technology, today’s engines tend to use narrower belts – like HC 50.
My guess is that you are looking at belts that started off at 1/2 inch top width and wore down to 3/8. That is a common situation.
I should be able to give you a better answer (retired as Chief Engineer from Gates a few years ago) but some of the information has leaked out of the old noggin.
If it is an accessory drive on the front of the engine, you can go to NAPA and they should have a Gates Catalog that will list a belt for the application.
I am on my way to the Bus Conversion Gathering, and don’t have access to my catalogs (I have some old copies that might list applications which are not shown in recent catalogs).
If you can’t find what you need at NAPA, and can wait till I get back in a couple of weeks, give me a note off line and I will try to see if I can find the correct belt (jim attttt rvsafetysystems dotxxx com).
By the way, only buy belts from the large parts houses such as NAPA, Big A, etc, as they carry belts made by one of the big three USA manufacturers. The lower level distribution tends to sell belts from off shore and they can be terrible quality. Most of the large distributors co-brand their belts and the sleeves will show the manufacturer (Gates, Goodyear or Dayco). Any of these belts will be the best quality you can buy.
If it is used on the engine, you should only use automotive belts and not industrial belts. There is quite a difference. If you get the belts from an automotive distributor, they will know the difference.
Sorry for the long post.
Jim Shepherd
Evergreen, CO
’85 Eagle 10
Bus Project details: http://www.rvsafetysystems.com/busproject.htm (updated 2/17/05) |
TWODOGS (Twodogs)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, April 18, 2005 - 8:31 am: | |
guess ...??? a Eagle 10 and a Eagle 05 are different...(??)....my miter box goes to the driver side ...has TWO shivs for 3/4 belts that drive the fan...then goes to a jackshaft that has a 3 shiv pulley to drive the bus
alternator...this 3 shiv is what I'm talking about...am getting different answers from everybody....know you are repowering with a series 60 & probably don't have a miter box anymore.. |
Jim Shepherd (Rv_safetyman)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, April 18, 2005 - 9:11 am: | |
TD, on my ’85 Eagle, that drive uses three industrial 3V belts (3/8 top width). It sounds like yours is the same. If you go to an Industrial belt distributor (such as Motion Industries) with your belt they will be able to get you the correct belt. My drive had what the industry calls a “joined” belt (Gates trade name: PowerBand), which is three belts joined by a common top ply. In order to use this joined belt, both pulleys must be made to industrial groove specifications (not automotive).
Eagle chose to use industrial belts for the cooling fan drives. They could do that because these drives are remote from the engine and do not have to deal with as much heat as the typical engine accessory drive does, as well as all of the other conditions that dictate a special construction for automotive belts.
Jim |
Ed/Jefferson bus
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, April 18, 2005 - 4:33 pm: | |
The belts that are used on an Eagle bus are not
automotive belts,they are fractional horsepower
industrial belts. |
TWODOGS (Twodogs)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, April 18, 2005 - 4:50 pm: | |
thanks Mr. Norris....haven't heard from you in a while...you are the one that told me my bus ran from Amarillo to Las Vegas... |
Jim Shepherd (Rv_safetyman)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, April 18, 2005 - 5:37 pm: | |
Ed, you guys are always dead on, but this one scares me a little bit.
There are three industrial belt standards in the US. The first is called Classical belts and that is the “A”, “B”, "C", etc section belts. The second is Narrow V-belts and that is the 3V, 5V, and 8V belts. The third standard is Fractional HP belts and that is 3L, 4L, and 5L sections. The latter belts are very low performance belts and are not intended to transmit very high HP (thus the name fractional HP). They are intended for things like table saws etc. They are generally rather thin belts that operate on smaller pulleys. Because they are thin, they are less stable. Most of the manufactures use less than premium materials in these belts.
From what I can tell, Eagle used 3V belts which are very high performance belt made with premium material. They are also quite a bit thicker than 3L belts. Huge difference in performance. Both belts have a nominal 3/8 top width.
If you are selling 3L belts for the Alt. drive, I would be worried about performance. I would not use them on my bus. Your experience might be good, but the 3L belts will not give anywhere near the service of a 3V.
As noted in my previous post, there is a 3/8 top width automotive belt. If a person used 3 of these belts, they would get good service as well. Just not the 3L
The above comments pertain to all manufacturers. I worked with all of the companies on our standards groups including ISO and know that the above discussion pertains to US manufacturers.
One last comment. The Fractional HP belts are often imported and some of them are extremely poor quality.
Jim |
TWODOGS (Twodogs)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, April 19, 2005 - 10:15 am: | |
update...went to motion ind. they said they could not give me the correct belt...went to O'rely auto parts,cute blonde had three GATES belts for 36.00 |
Ed/Jefferson bus
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, April 19, 2005 - 4:42 pm: | |
Depends on the application,Eagles use ''B'',''C'',
''5V''for the wide belts.They use ''3V'' for narrow on Alt.01's,05's,&10's use ''B''belts for
Rad fan & A/C condensor fan. M15's&20's use the
''C'' or''5V''. |