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running engine without fan for diagnostics?

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Anthiron The Baja Rejuvenation Begins

4,936 posts · joined Oct 2003 ·

#644554
i want to run my engine with the fan belt disconnected to pin point a problem that i think resides in the generator assembly.

i know you shouldnt run the engine without the fan going but people do it with drag cars.

how long could i run it without doing damage? is 1 minute too long? i just want to start it up, give it a rev and listen for a few seconds and then turn it off.

comments?
62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom

68AutoBug Beetle Restorer - Experience over 138\% - YIKES --

11,654 posts · joined Aug 2002 ·

#644572
I think a minute wouldn't hurt... IMHO..

and as you say the drag cars do it without any fan etc...

and they push out heaps of heat..

LEE
- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---

blutopless2 DAMSLO

2,457 posts · joined Jan 2004 ·

#644607
wouldn't think a short run under a minute would hurt it... main thing is that the water will not circulate via the pump.
Think most drag cars would run electric water pumps and thermo fans (if they run radiators) so that its not a mechanical device sucking hp from the motor.
see.... air and water do mix 😉

1974 1300
1997 MK3 Golf GL
2003 NB Cabrio
2012 Golf VI GTI
2014 Audi A4 Quattro

aggri1 Insano Dub Head

824 posts · joined Dec 2003 ·

#644622
blutopless2 wrote:main thing is that the water will not circulate via the pump.
What? Am I missing something here?

I reckon a minute will be totally fine, especially if it's not already come straight off the freeway.

Think about how long it takes to 'warm up' on a cold winter morning (do you guys get those up north?). If I had a thermostat, I'd look and see how long it took to open the flaps: then I'd hypothesise that it's safe to run at least that long without a fan. Does this make sense to anyone else?

Cheers, A.

blutopless2 DAMSLO

2,457 posts · joined Jan 2004 ·

#644626
hahahaha.... just re-read that one myself... was thinking watercooled when i replied...
see.... air and water do mix 😉

1974 1300
1997 MK3 Golf GL
2003 NB Cabrio
2012 Golf VI GTI
2014 Audi A4 Quattro

Anthiron The Baja Rejuvenation Begins

4,936 posts · joined Oct 2003 ·

#644643
yeah i was a bit confused there too blutopless2 ha ha

ok i guess ill give it a shot real quick today
62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom

mackaymanx Custom Title Time!

1,611 posts · joined Jan 2006 ·

#644647
Have done this before, they do heat up surprising quickly but it is doable
Quote of the week
"Do I wish to send them to you again, nope, no interest can't be bothered really, to much hassle for little or no return."

[IMG]https://www.vw-mplate.com/mplate2-18600.png[/IMG]

blutopless2 DAMSLO

2,457 posts · joined Jan 2004 ·

#644671
Anthiron wrote:yeah i was a bit confused there too blutopless2 ha ha
yeah dont mind me i'm just mental!! 😂
see.... air and water do mix 😉

1974 1300
1997 MK3 Golf GL
2003 NB Cabrio
2012 Golf VI GTI
2014 Audi A4 Quattro

Joel Now containing 100\% E-Wang

9,368 posts · joined Feb 2006 ·

#644752
from cold it will be fine just dont run it for hours

a few years ago on my way to work i came across a young girl broken down in a kombi
when i had a look the crank pulley had fallen apart.
the outter belt track had separated from the pulley center, how i have no idea but once it had cooled down i drove it 3kms down the road to work and put one of my old crank pulleys on and she was on her way

bumped into her a few months ago kombi is still going 3 years later