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Is it normal for alternator pulley to be too hot to touch?
Posted by: DaveO90s4 ()
Date: November 23, 2017 02:09AM

Hi all,

I'm very very new to actually having a running Corvair engine. 1st drive this afternoon.

After a 30-40 minute drive and after shutting off for 3-5 minutes the alternator pulley is too hot to touch.

Is this normal or is that hotter then normal?

Will dig out my IR temp gauge and check the actual temp tomorrow.

In the meantime I'd appreciate comments please.

(Engine is 140 HP reverse rotation installed in Porsche 914 with all tinware in place, standard 12-plate oil cooler, remote oil filter and new oil flow bypass valves for both cooling and filtering).

Thanks in advance

DaveO

Bne
Oz

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Re: Is it normal for alternator pulley to be too hot to touch?
Posted by: Lane66m ()
Date: November 23, 2017 04:09AM

How tight is the belt?

Al Lane
Ellabell GA

1966 Monza Coupe, 110 hp, 4 Spd
1968 Camaro SS Coupe 350 CI 295+ HP PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
2015 Chevrolet Malibu 2LT
2018 Chevrolet Silverado LTZ Z71 Centennial Edition
1947 Farmall A tractor 15 hp


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Re: Is it normal for alternator pulley to be too hot to touch?
Posted by: ihscomputers ()
Date: November 23, 2017 04:21AM

Al (Lane66m) is asking that question because you should be able to move the alternator fan with one finger when the fan belt is properly tightened.

Dean F. Gemberling
Columbus, Georgia


1963 Rampside w/305 V8 - Built by Ken Arnold in 1998

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Re: Is it normal for alternator pulley to be too hot to touch?
Posted by: DaveO90s4 ()
Date: November 23, 2017 04:28AM

Hi Al,

Loose enough to turn the fan blades with two fingers when engine is cold - I think that is what its meant to be to avoid belt throwing?

Does your alternator pulley get that hot? - i.e. is what I am experiencing normal?

Cheers
Dave

PS Your oil cooler leaks not a drop!! I'm very pleased with that (unless of course my oil is bypassing the cooler - hence the heat and my related posts about oil bypass valves. Hopefully I'm worrying about nothing)

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Re: Is it normal for alternator pulley to be too hot to touch?
Posted by: DaveO90s4 ()
Date: November 23, 2017 05:21AM

Hi Dean,

Thanks for your message above - yes I guessed that was the reason. I can turn the horizontal fan with two fingers when engine is cold. I've not tried turning the alternator pulley / alternator fan with one finger with engine cold.

I'll try that tomorrow morning before start up.

But, in any event, is 'too hot to touch' too hot or typical? (i.e. do I have a problem or don't i??)

Many thanks all

DaveO

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Re: Is it normal for alternator pulley to be too hot to touch?
Posted by: Wagon Master ()
Date: November 23, 2017 05:49AM

Not typical. One item that may have been overlooked. With a reverse rotation engine, the stock Corvair fan and pulley should be replaced with a standard issue GM unit. Can you post a picture of what you have now?

'29 Ford Model A Tudor
'61 700 Lakewood 110 4 speed
'69 Monza Convert. 140 Auto.
'70 Dodge Challenger R/T 440 4 speed

Been aircooled since 1973
Northwest Ohio

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Re: Is it normal for alternator pulley to be too hot to touch?
Posted by: Bob Helt ()
Date: November 23, 2017 06:00AM

DaveO90s4 Wrote:
-------------------------------------------------------
> Hi all,
>
> I'm very very new to actually having a running
> Corvair engine. 1st drive this afternoon.
>
> After a 30-40 minute drive and after shutting off
> for 3-5 minutes the alternator pulley is too hot
> to touch.
>
> Is this normal or is that hotter then normal?
>
> Will dig out my IR temp gauge and check the actual
> temp tomorrow.
>
> In the meantime I'd appreciate comments please.
>
> (Engine is 140 HP reverse rotation installed in
> Porsche 914 with all tinware in place, standard
> 12-plate oil cooler, remote oil filter and new oil
> flow bypass valves for both cooling and
> filtering).
>
> Thanks in advance
>
> DaveO
>
> Bne
> Oz


Dave,
It sounds like something is wrong there. I suggest that you remove the belt (engine stopped) and see how easily the alt turns by hand. Remember tho that the alt pulley will get fairly warm in use just from engine heat.

Bob Helt

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Re: Is it normal for alternator pulley to be too hot to touch?
Posted by: RKF ()
Date: November 23, 2017 06:28AM

An electrical short somewhere in the car can cause excessive drag on the rotation of the alternator.

You might try disconnecting the wire(s) from the alternator, drive the car a short distance, and see if the pulley still gets hot.

If the pulley still gets hot when the alternator is disconnected the problem is mechanical.

If it stays cool, the problem is electrical.

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Re: Is it normal for alternator pulley to be too hot to touch?
Posted by: Timothy Shortle ()
Date: November 23, 2017 06:53AM

May not be abnormal. Part of it depends on your definition of "too hot". They do get hot from normal driving. Do you have a pyrometer to see what the temp. actually is?

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Re: Is it normal for alternator pulley to be too hot to touch?
Posted by: Wagon Master ()
Date: November 23, 2017 07:01AM

Too hot
Too hot
I test my belt tension with the one finger method when cold. I can drive 100 miles, shut it off, let it set for 5 minutes and do the finger test again to check hot tension and it's not too hot to touch.


'29 Ford Model A Tudor
'61 700 Lakewood 110 4 speed
'69 Monza Convert. 140 Auto.
'70 Dodge Challenger R/T 440 4 speed

Been aircooled since 1973
Northwest Ohio

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Re: Is it normal for alternator pulley to be too hot to touch?
Posted by: MattNall ()
Date: November 23, 2017 07:30AM

What is the system voltage when running? SB 14 vdc





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
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..............................110-PG.................................................Webered-Turbo

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Re: Is it normal for alternator pulley to be too hot to touch?
Posted by: DaveO90s4 ()
Date: November 23, 2017 01:06PM

Thanks for the replies everyone.

Here's a shot of the alternator pulley - pretty sure this is correct for a reverse rotation engine.

With engine cold:-

With my thumb on the flat of those blades I can quite easily push it away from me (from the top). But pulling it in the other direction is pretty hard.

With regard to the engine fan itself - I can barely rotate it. Well, I can, but only with very much effort.

I think my belt is too tight.

When I got home after my 1st short drive the battery was discharged. That, plus hot alternator? Off to the auto electrician to get the alternator charging system checked out.

Just teething problems I hope.

Cheers

Dave

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Re: Is it normal for alternator pulley to be too hot to touch?
Posted by: Leon ()
Date: November 23, 2017 01:41PM

This might be a stupid question but with the engine rotation reversed wouldn't the alternator be more like a idler pulley as it's on the slack side of the belt, and thus more likely to slip and heat up the pulley?

Star NC
1965 Monza Coupe, turbocharged 140/4spd, Carter AFB 4bbl, E-flow Crown turbo, water/meth injection, driver
1965 Corsa Coupe, 140/4spd, future project
1966 Monza Coupe, 110/4spd parts car
1966 Monza 'vert, 95/PG parts car
1985 Dodge W350 4dr turbocharged 440/4spd

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Re: Is it normal for alternator pulley to be too hot to touch?
Date: November 23, 2017 01:52PM

What is that structure adjacent to the end of the alternator? Does it block airflow through the alternator?

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Re: Is it normal for alternator pulley to be too hot to touch?
Posted by: DaveO90s4 ()
Date: November 23, 2017 03:28PM

In reply:-

- Leon you could be correct. I don't know. I'm inclined to think the belt is not slipping though - no belt slippage noises and it is pretty tight with plenty of wrap. If anything maybe too tight.

- Boranda, I have mounted a vertical bracket to the alternator, using the two top long machine screws that hold the two halves of the alternator case together. This is for my accelerator linkage. Thanks for the suggestion about blocking airflow through the alternator, and I've just checked and neither that bracket nor anything else is blocking alternator air flow.

Have rung auto electrician that did the wiring for me - booked in for later today.

Cheers
DaveO

Dave O

1975 Porsche 914 with 140 HP Corvair reverse rotation engine, zenith 40 TINS, Otto 20 (or 30?) cam, etc, Australia

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Re: Is it normal for alternator pulley to be too hot to touch?
Posted by: RKF ()
Date: November 23, 2017 03:30PM

<>

It sure sounds like you've got an electrical issue, either inside the alternator or elsewhere in the car.

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Re: Is it normal for alternator pulley to be too hot to touch?
Posted by: 66vairman ()
Date: November 23, 2017 04:05PM

Dave - that appears to be the incorrect fan AND pulley.

Normal operation is for air to be pulled in the back (connector side) and expelled out at the fan/pulley side.

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Re: Is it normal for alternator pulley to be too hot to touch?
Posted by: American Mel ()
Date: November 23, 2017 05:43PM

66vairman Wrote:
-------------------------------------------------------
> Dave - that appears to be the incorrect fan AND
> pulley.
>
> Normal operation is for air to be pulled in the
> back (connector side) and expelled out at the
> fan/pulley side.


And it will be with that set-up.
He is running "Reverse Rotation."

.
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
WA. state, 1 mile south of the Canadian border,
I am not at the end of the world, but you can see it from here.
'66 Monza Coupe - 4spd, 140 Daily driver beater
'67 Monza Vert. - PG, 140 Daily driver beater
'67 A/C Moredoor Monza - 140 4-spd. driver

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Re: Is it normal for alternator pulley to be too hot to touch?
Posted by: Vin ()
Date: November 23, 2017 06:44PM

The heat from my tins, pulley and alternator (to the touch) varies fairly significantly depending on the outside temperature. In the spring and fall in Ohio I can stand to touch things after running it but those components of course are warm. But in the summer in Ohio with Temps in the mid to upper 80s those components get too hot to touch for long. Experts here have told me that is quite normal, and that things actually heat up more initially just after the engine is turned off. So I wonder where you are and what the temperature is outside. And of course hot to the touch is a subjective thing. So certainly worth looking into but maybe nothing is wrong.

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Re: Is it normal for alternator pulley to be too hot to touch?
Posted by: MattNall ()
Date: November 23, 2017 06:55PM

130F is too hot to hold onto metal.





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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