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  #1  
Old 06-15-2018, 06:27 PM
dbegeman dbegeman is offline
 
Join Date: Mar 2018
Location: Conifer, CO
Posts: 4
Default Alternator belt and bracket issue

I need a little help here. I had my prop pulled for a leak at the seal and while the prop was off it was recommended that I replace the belt. I went out and got the exact same belt (Gates 7360XL) that was on the airplane before the prop was pulled. Now the new belt is too big and the alternator adjusting bracket doesn't have any room left to adjust and put tension on the belt. My question is, is there a bigger (longer) bracket? Mine is boss mounted and the bracket in question has part number 99-1004 stamped on it, the alternator is a plane power alternator. I know I could pull the prop and put on a smaller belt but I would like to avoid pulling the prop. Thanks in advance!!

Last edited by dbegeman : 06-15-2018 at 06:36 PM.
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  #2  
Old 06-15-2018, 06:48 PM
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Mel Mel is offline
 
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Default

Be aware that installing a longer belt will very likely cause the alternator to rub the cowling. There is not much lee-way here.

Remember; Every change usually necessitates other changes.
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<rvmel(at)icloud.com>
North Texas (8TA5)
RV-6 Flying since 1993, 172hp O-320, 3-Blade Catto (since 2003)
Legend Cub purchased 12/2017
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  #3  
Old 06-15-2018, 08:37 PM
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RV8JD RV8JD is offline
 
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Default

I had a similar problem when I replaced the alternator belt on my previous RV-8. The Gates 7360 (which B&C recommends) was just a little too big, and allowed the B&C 40 Amp alternator to rub on the cowl (as Mel mentioned). I took it off and installed a Dayco 15355 and it was the right fit.

Since you have an RV-6, YMMV.
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Arlington, WA (KAWO)
RV-8, 340 Tach Hours
(Pic 1),(Pic 2)
- Out with the Old, In with the New
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RV-8, 1938 Tach Hours (Pic 1),(Pic 2) - Sold

Glasflügel Standard Libelle 201B, N564NS - Sold
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Last edited by RV8JD : 06-15-2018 at 09:41 PM.
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  #4  
Old 06-15-2018, 09:31 PM
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chrispratt chrispratt is offline
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Default My B&C experience

Hmm, interesting Carl. The belt B&C sent me was a 7365 and that was too long - by about a half inch. It rubbed the cowl and dug a nice furrow into it. I went back to a 7360 like I had on my old Van's Nippon Densu alternator and it worked fine. I checked with Walt Aranow at my home field and he said he has a drawer full of B&C 7365. They're too long - he uses the the 7360 also.

Debegeman: Perhaps the "XL" in the Gates is the issue. Try a NAPA 7360 without the XL.

Chris
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  #5  
Old 06-15-2018, 09:40 PM
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RV8JD RV8JD is offline
 
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Quote:
Originally Posted by chrispratt View Post
Hmm, interesting Carl. The belt B&C sent me was a 7365 and that was too long - by about a half inch. It rubbed the cowl and dug a nice furrow into it. I went back to a 7360 like I had on my old Van's Nippon Densu alternator and it worked fine. I checked with Walt Aranow at my home field and he said he has a drawer full of B&C 7365. They're too long - he uses the the 7360 also.

Debegeman: Perhaps the "XL" in the Gates is the issue. Try a NAPA 7360 without the XL.

Chris
You may have point. I checked my records and it was the 'XL" version of the Gates 7360 that was too large for my installation. Regardless, the Dayco 15355 worked out fine.
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Carl N.
Arlington, WA (KAWO)
RV-8, 340 Tach Hours
(Pic 1),(Pic 2)
- Out with the Old, In with the New
(Pic)
RV-8, 1938 Tach Hours (Pic 1),(Pic 2) - Sold

Glasflügel Standard Libelle 201B, N564NS - Sold
Rolladen-Schneider LS1-f, N61MP - No longer owned

Last edited by RV8JD : 06-15-2018 at 09:52 PM.
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  #6  
Old 06-15-2018, 10:38 PM
dbegeman dbegeman is offline
 
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Location: Conifer, CO
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Quote:
Originally Posted by chrispratt View Post
Hmm, interesting Carl. The belt B&C sent me was a 7365 and that was too long - by about a half inch. It rubbed the cowl and dug a nice furrow into it. I went back to a 7360 like I had on my old Van's Nippon Densu alternator and it worked fine. I checked with Walt Aranow at my home field and he said he has a drawer full of B&C 7365. They're too long - he uses the the 7360 also.

Debegeman: Perhaps the "XL" in the Gates is the issue. Try a NAPA 7360 without the XL.

Chris
The weird part is the original belt was a 7360XL also. I was hoping not to have to pull the prop to put on a smaller belt!!
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  #7  
Old 06-16-2018, 05:41 AM
vic syracuse vic syracuse is offline
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Default 7355

I too have found the 7355 belts work better. I never install the 7365 that comes with the alternators. The alternator pulley will put a hole in the cowling.
It is weird that your original one is different than the new-purchased one. Perhaps one of them is mis-marked.

Vic
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  #8  
Old 06-16-2018, 04:07 PM
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chrispratt chrispratt is offline
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Quote:
Originally Posted by dbegeman View Post
The weird part is the original belt was a 7360XL also. I was hoping not to have to pull the prop to put on a smaller belt!!
After looking at the package today, I think the XL may be just a marketing term for Xtened Life or Extra Long Life as it was on my original as well. I removed my cowl today and saw no more cowling rub from the 7360. My alternator is the B&C 40 amp. The 7365 was the culprit for the cowl damage (repaired).

Not sure why the 7360 didn't work for you. Curious.

Chris
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  #9  
Old 06-16-2018, 04:41 PM
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Mel Mel is offline
 
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Quote:
Originally Posted by chrispratt View Post
After looking at the package today, I think the XL may be just a marketing term for Xtened Life or Extra Long Life as it was on my original as well. I removed my cowl today and saw no more cowling rub from the 7360. My alternator is the B&C 40 amp. The 7365 was the culprit for the cowl damage (repaired)
Not sure why the 7360 didn't work for you. Curious.
Chris
Also be aware that positive "G" maneuvers have a big influence on alternator rubbing the cowling. If you intend to do much aerobatics, you will need more than the minimum clearance.
__________________
Mel Asberry..DAR since last century
A&P/EAA Tech Counselor/Flight Advisor
Specializing in Amateur-Built and Light-Sport Aircraft
<rvmel(at)icloud.com>
North Texas (8TA5)
RV-6 Flying since 1993, 172hp O-320, 3-Blade Catto (since 2003)
Legend Cub purchased 12/2017
FRIEND of the RV-1
Eagle's Nest Mentor
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  #10  
Old 06-16-2018, 07:17 PM
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chrispratt chrispratt is offline
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Good point Mel. I'll keep that in mind.

Chris
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