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From: TE Chea on 20 Jun 2007 07:54
My NipponDenso * has no fan / impeller to pull air into * to cool
*, so this * ( esp when heated by engine block ) gets too hot ( can
boil an egg ) in 33�C air, output ( ampere & voltage ) drops too
low just as described in
www.aa1car.com/library/charging_checks.htm last paragraph.
Users cannot fit an impeller because no space exists between (
drive belt's ) pulley & * ( like in this web page's photo ).
I presume such *'s designers want to keep * small, to fit * into
engine compartment, but leaving out an impeller ( & let * overheat
, as per this web page ) looks ridiculous.
My Hitachi lawn mower's motor has an impeller : motor never gets
hot if impeller is fitted. Our 3 Black & Decker trimmers' motors
have no impeller, all 3 motors' coils melted in 33�C air & had to be
recoiled.





From: Comboverfish on 20 Jun 2007 11:45
On Jun 20, 6:54 am, "TE Chea" <4...(a)gmail.com> wrote:
> My NipponDenso * has no fan / impeller to pull air into * to cool
> *, so this * ( esp when heated by engine block ) gets too hot ( can
> boil an egg ) in 33ºC air, output ( ampere & voltage ) drops too
> low just as described inwww.aa1car.com/library/charging_checks.htmlast paragraph.
> Users cannot fit an impeller because no space exists between (
> drive belt's ) pulley & * ( like in this web page's photo ).
> I presume such *'s designers want to keep * small, to fit * into
> engine compartment, but leaving out an impeller ( & let * overheat
> , as per this web page ) looks ridiculous.
> My Hitachi lawn mower's motor has an impeller : motor never gets
> hot if impeller is fitted. Our 3 Black & Decker trimmers' motors
> have no impeller, all 3 motors' coils melted in 33ºC air & had to be
> recoiled.

Have you looked inside the unit yet? Look near the rear, just in
front of the steel endcap, through the cast holes in the rear case
(with a flashlight). There should be a steel fan attached to the rear
end of the rotor.

ND makes probably the most reliable alternators I have ever seen in
production. Perhaps if they were speced more poorly they would need
an external fan. I don't know how that would would be superior to the
current design, unless they employed Delphi CS series front bearings.
A front fan doesn't even keep those POS (plural) from failing.

Toyota MDT in MO

From: Tegger on 20 Jun 2007 17:27
Comboverfish <comboverfish(a)yahoo.com> wrote in
news:1182354304.007034.99160(a)w5g2000hsg.googlegroups.com:

> On Jun 20, 6:54 am, "TE Chea" <4...(a)gmail.com> wrote:
>> My NipponDenso * has no fan / impeller to pull air into * to cool
>> *, so this * ( esp when heated by engine block ) gets too hot ( can
>> boil an egg ) in 33�C air, output ( ampere & voltage ) drops too
>> low just as described
>> inwww.aa1car.com/library/charging_checks.htmlast pa
> ragraph.
>> Users cannot fit an impeller because no space exists between (
>> drive belt's ) pulley & * ( like in this web page's photo ).
>> I presume such *'s designers want to keep * small, to fit * into
>> engine compartment, but leaving out an impeller ( & let * overheat
>> , as per this web page ) looks ridiculous.
>> My Hitachi lawn mower's motor has an impeller : motor never gets
>> hot if impeller is fitted. Our 3 Black & Decker trimmers' motors
>> have no impeller, all 3 motors' coils melted in 33�C air & had to be
>> recoiled.
>
> Have you looked inside the unit yet? Look near the rear, just in
> front of the steel endcap, through the cast holes in the rear case
> (with a flashlight). There should be a steel fan attached to the rear
> end of the rotor.



I just happen to still have my old ND alternator from my '91 Integra.

I study this unit, and lo and behold there is an impeller at BOTH ENDS:
both the diode end and the pulley end. One is evidently a "pusher" and one
a "puller".

Both impellers are within the casing and are not readily visible without
close observation, but are unmistakeably present.


--
Tegger

From: Nate Nagel on 20 Jun 2007 18:31
TE Chea wrote:
> My NipponDenso * has no fan / impeller to pull air into * to cool
> *, so this * ( esp when heated by engine block ) gets too hot ( can
> boil an egg ) in 33�C air, output ( ampere & voltage ) drops too
> low just as described in
> www.aa1car.com/library/charging_checks.htm last paragraph.
> Users cannot fit an impeller because no space exists between (
> drive belt's ) pulley & * ( like in this web page's photo ).
> I presume such *'s designers want to keep * small, to fit * into
> engine compartment, but leaving out an impeller ( & let * overheat
> , as per this web page ) looks ridiculous.
> My Hitachi lawn mower's motor has an impeller : motor never gets
> hot if impeller is fitted. Our 3 Black & Decker trimmers' motors
> have no impeller, all 3 motors' coils melted in 33�C air & had to be
> recoiled.

ALL of the alternators I have ever worked on have had some sort of fan
(various Delcos, Prestolites, Bosches and Motorolas)

nate


--
replace "roosters" with "cox" to reply.
http://members.cox.net/njnagel
From: Steve on 20 Jun 2007 18:51
Comboverfish wrote:

> On Jun 20, 6:54 am, "TE Chea" <4...(a)gmail.com> wrote:
>
>>My NipponDenso * has no fan / impeller to pull air into * to cool
>>*, so this * ( esp when heated by engine block ) gets too hot ( can
>>boil an egg ) in 33�C air, output ( ampere & voltage ) drops too
>>low just as described inwww.aa1car.com/library/charging_checks.htmlast paragraph.
>>Users cannot fit an impeller because no space exists between (
>>drive belt's ) pulley & * ( like in this web page's photo ).
>>I presume such *'s designers want to keep * small, to fit * into
>>engine compartment, but leaving out an impeller ( & let * overheat
>>, as per this web page ) looks ridiculous.
>>My Hitachi lawn mower's motor has an impeller : motor never gets
>>hot if impeller is fitted. Our 3 Black & Decker trimmers' motors
>>have no impeller, all 3 motors' coils melted in 33�C air & had to be
>>recoiled.
>
>
> Have you looked inside the unit yet? Look near the rear, just in
> front of the steel endcap, through the cast holes in the rear case
> (with a flashlight). There should be a steel fan attached to the rear
> end of the rotor.

Correct- every ND alternator I've ever seen looks like a small clone of
the original Chrysler alternator- finned case with a fan on each end of
the shaft (two fans) on the INSIDE of the finned case. No big external
fan required.
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