3 x thermo fans stripped in one trip - GU custom brass radiator 6.5 chev GU

Surely he can not have just got 3 faulty fans?

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Originally Posted by big_fletch

I checked it out when he had got too Shepparton and replaced one of the fans. The Davies Craig fans are plastic with a center metal nut that's basically cast into the fan. The plastic fan blades had basically stripped from this nut with is held too the motor shaft with a clip. Fans run through a separate relay from each fan and triggered by a thermo switch mounted into the top of the radiator.

Both fans are bolted through the radiator. After replacing the fan and checked it was not rubbing on the radiator I checked airflow direction with my hand and then put a piece of paper down too double check myself.

Myself and my Boss are stumped on why it's doing it?? Once the problem is worked out I'm very keen too know what's wrong

Fletcha

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Aaaahhhh, the plot thickens Dr Watson,

Curious as to why did you check the airflow with paper and your hand instead of just visually confirming the blade rotation?
I ask purely because airflows can be very deceptive around radiators etc.

Thinking about this again last night I was also wondering if cavitation may be an issue

At least being Davies Craig and only a few months or in the 3rd case, hours old, I'm sure they will make good on any faulty gear.

I wonder if setting the thermostat [for the fans] lower would help and what value thermostat is fitted[for the motor]
Getting curiouser and curiouser lol. I think they need a shroud to be more efficient, but need to source problem first

Fan working should hold a full sheet of paper to the front of the radiator easily
I have a brand new shroud here for a single 21" fan if you need it[alloy]
what size radiator??mm x mm


Surely Davies Craig will have an answer ,they must have come across this over the years

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Originally Posted by the evil twin

Aaaahhhh, the plot thickens Dr Watson,

Curious as to why did you check the airflow with paper and your hand instead of just visually confirming the blade rotation?
I ask purely because airflows can be very deceptive around radiators etc.

Thinking about this again last night I was also wondering if cavitation may be an issue

At least being Davies Craig and only a few months or in the 3rd case, hours old, I'm sure they will make good on any faulty gear.

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Nah I did check fan blade rotation as the blades need too be reversed too pull air not push ( Davis Craig fans are reversible). I just like too double and triple check myself haha

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Originally Posted by big_fletch

Nah I did check fan blade rotation as the blades need too be reversed too pull air not push ( Davis Craig fans are reversible). I just like too double and triple check myself haha

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No worries, Cobber.

Not trying to tell anyone who has posted to suck eggs... this is for others reading the thread in future or DIY

If the fans are installed as pullers the installer also needs to swap the "polarity" of the motor leads not just reverse the blade assy and double check that the "must face forward" is correct as marked on the fan.

Davies Craig make very similar models that rotate clockwise and anti-clockwise and that is an easy trap to fall into as well (learnt that from experience insert forehead slap here)

http://www.daviescraig.com.au/Images...(08-08-06).pdf

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Originally Posted by the evil twin

No worries, Cobber.

Not trying to tell anyone who has posted to suck eggs... this is for others reading the thread in future or DIY

If the fans are installed as pullers the installer also needs to swap the "polarity" of the motor leads not just reverse the blade assy and double check that the "must face forward" is correct as marked on the fan.

Davies Craig make very similar models that rotate clockwise and anti-clockwise and that is an easy trap to fall into as well (learnt that from experience insert forehead slap here)

http://www.daviescraig.com.au/Images...(08-08-06).pdf

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Hey mate confirming polarity was swapped as well.

Are you sure its not overheating?

Does he only have the standard GU temp gauge or is he running an after market temp gauge?

How close is this particular part that is stripping to the core?

What else is in front of the radiator? Why did he do away with the viscous?

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Originally Posted by NissanGQ4.2

Are you sure its not overheating?

Does he only have the standard GU temp gauge or is he running an after market temp gauge?

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Standard gauge but its definitely overheating once fan/s stopped

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Originally Posted by nissannewby

How close is this particular part that is stripping to the core?

What else is in front of the radiator? Why did he do away with the viscous?

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The radiator place told him to put them on and they were working amazingly well prior.

He has 2 giant spotties in front of the radiator...I know I know, I told him that as well.