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  #1  
Old 02-16-2019, 08:23 AM
T.O.Craig T.O.Craig is offline
 
Join Date: Feb 2006
Posts: 165
Default Alternator Alignment

Good Morning to All,
I'm getting close to our first flight. While checking and re-checking I noticed that my plane power alternator is out of alignment by 3/16". It is forward of the flywheel by that amount.

I do have a double pulley that was supplied by Vans when I purchased the YIO540D4A5 and firewall forward kit. I also have a plane power 60 amp alternator supplied by Vans.

Have others experienced this and how was this issue handled?
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FLYING NOW AFTER 13+ YEARS. NICE FLYING AIRCRAFT!!
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  #2  
Old 02-16-2019, 08:59 AM
T.O.Craig T.O.Craig is offline
 
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Posts: 165
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Howdy again,
I did a search and found the info I needed, just not sure if Vans will charge me for there mistake...:-))
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Craig Rufi
FLYING NOW AFTER 13+ YEARS. NICE FLYING AIRCRAFT!!
RV-10/Empennage/Wings/QB Fuselage/Wiring/Doors done finally, Cowling done. Stein panel complete, and connecting all those wires :-))Thousand Oaks, Ca. Dues paid for 2019
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  #3  
Old 02-16-2019, 09:57 AM
AviatorJ AviatorJ is offline
 
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Location: Oklahoma City
Posts: 913
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Toss the answer out there for future searches. I know a buddy of mine had issues with his belt alignment. Not sure how he resolved it though.
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  #4  
Old 02-16-2019, 10:32 AM
lr172 lr172 is online now
 
Join Date: Oct 2013
Location: Schaumburg, IL
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Use shims or washers in the lower alt mount to bring it parallel. Misalignment across the parallel axis will create excess side wear on the belt. It also puts more stress on thrust portion of the alt bushing which isn't designed for a lot of load. You will then need the same sized shims for the upper mount as well.

Larry
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Last edited by lr172 : 02-16-2019 at 11:45 AM.
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  #5  
Old 02-16-2019, 11:42 AM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
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Quote:
Originally Posted by AviatorJ View Post
Toss the answer out there for future searches. I know a buddy of mine had issues with his belt alignment. Not sure how he resolved it though.
The standard flywheel has one pulley, and the stock alternator should line up. The two pulley flywheel is for those that want air conditioning; some shimming will be needed for the alternator.
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  #6  
Old 02-16-2019, 12:08 PM
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hgerhardt hgerhardt is offline
 
Join Date: Oct 2006
Location: torrance, ca
Posts: 650
Default

Quote:
Originally Posted by lr172 View Post
Use shims or washers in the lower alt mount to bring it parallel. Misalignment across the parallel axis will create excess side wear on the belt. It also puts more stress on thrust portion of the alt bushing which isn't designed for a lot of load. You will then need the same sized shims for the upper mount as well.

Larry
The rotor is suspended by sealed ball bearings at each end, Not a bushing (at least not for Denso-style castings, which B&C and PlanePower use).

The alternator bearings won't suffer too much from misalignment, but the belt sure will.
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  #7  
Old 02-16-2019, 12:25 PM
lr172 lr172 is online now
 
Join Date: Oct 2013
Location: Schaumburg, IL
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Quote:
Originally Posted by hgerhardt View Post
The rotor is suspended by sealed ball bearings at each end, Not a bushing (at least not for Denso-style castings, which B&C and PlanePower use).

The alternator bearings won't suffer too much from misalignment, but the belt sure will.
I believe you are correct, I was thinking of something different. Alternator usually have a press fit on the shaft.
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  #8  
Old 02-16-2019, 04:55 PM
mfcummings mfcummings is offline
 
Join Date: Aug 2017
Location: Wellsboro, PA
Posts: 29
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Quote:
Originally Posted by T.O.Craig View Post
Good Morning to All,
I'm getting close to our first flight. While checking and re-checking I noticed that my plane power alternator is out of alignment by 3/16". It is forward of the flywheel by that amount.

I do have a double pulley that was supplied by Vans when I purchased the YIO540D4A5 and firewall forward kit. I also have a plane power 60 amp alternator supplied by Vans.

Have others experienced this and how was this issue handled?
I have the same situation and purchased the "spacer kit" from Vans but have yet to install it, soon I hope. It was like $45.00

Mike Cummings
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