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Overheating probs 351 c 

 

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 Post subject: Overheating probs 351 c
Posted: Wed Nov 16, 2016 12:33 pm 
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Age: 50

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Joined: 16th Nov 2016

Ride: FJ40 mod / 351

Location: Central QLD
QLD, Australia

Hi , I need some help in solving a problem . I have a 351 c 2 v , its fitted in my land cruiser . I have severe over heating problems . So here is the scenario , I have no overheating probs when it's idling , it will stay around 75 deg c . When I Drive it hard it will boil over @120 deg c . These are the things I've done so far , new ally radiator suit xw 351 , new 17" flex fan , correct thermostat ( dayco DT66A ) , high flow water pump , thermo fan on front of radiator , and finally a full fan shroud . Any ideas , I have a theory the flex fan is flatning out stopping air flow at higher revs . Thanks Dazza
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 Post subject: Re: Overheating probs 351 c
Posted: Wed Nov 16, 2016 3:09 pm 
Getting Side Ways
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Location: Melbourne
VIC, Australia

Just a few questions to eliminate possible causes:

1. Are you using a good quality coolant? Using a 30-50% mix?

2. Is your high flow water pump electric?

3. Any chance the radiator core is faulty and not letting the coolant through fast enough?
I'd expect this from a Chinese made product.

4. Have you tried running it without the flex fan and just using the thermo fan?

5. When is the thermo fan set to turn on?

 

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 Post subject: Re: Overheating probs 351 c
Posted: Wed Nov 16, 2016 4:48 pm 
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Is the electric fan going the correct direction, is there good coolant flow through the engine and radiator?

I would look at deleting the engine fan and fitting a good Twin Thermo Fan (EF/EL/AU) or large single fan as fitted to some of the B series Falcons on the inside of the engine bay. Then there is no restriction to the airflow.

Also fit the largest radiator that you can into the space allowed.

 

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 Post subject: Re: Overheating probs 351 c
Posted: Sat Nov 19, 2016 11:39 pm 
Getting Side Ways
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Age: 37

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Ride: 66 Coupe

Location: Perth
WA, Australia

Dazza10000 wrote:
Hi , I need some help in solving a problem . I have a 351 c 2 v , its fitted in my land cruiser . I have severe over heating problems . So here is the scenario , I have no overheating probs when it's idling , it will stay around 75 deg c . When I Drive it hard it will boil over @120 deg c . These are the things I've done so far , new ally radiator suit xw 351 , new 17" flex fan , correct thermostat ( dayco DT66A ) , high flow water pump , thermo fan on front of radiator , and finally a full fan shroud . Any ideas , I have a theory the flex fan is flatning out stopping air flow at higher revs . Thanks Dazza


whats your ignition timing curve look like?
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 Post subject: Re: Overheating probs 351 c
Posted: Mon Nov 21, 2016 10:16 am 
Fordmods Newbie
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Age: 50

Posts: 3

Joined: 16th Nov 2016

Ride: FJ40 mod / 351

Location: Central QLD
QLD, Australia

Thanks everyone , I took the car 'tis radiator specialist , he checked it all out . He found the radiator way too small . New radiator ,cost a lot and no more overheating . Chinese radiators be careful , anadvertised 3 core may not be what gets delivered .
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