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Offline allanuber


  • Joined: Aug 2007

  • Location: Sydney
  • Name: Al
One for the ferrari experts - any help or guidance much appreciated.

My mighty 456 has had some big problems. End of last year, after about 10,000K's of faultless operation (total about 50,000K's) the temperature started to skyrocket. Initially the mechanic tried a new radiator cap, saying he'd had a few that were losing pressure that way and it might be a quick fix. Once started up again and warm, the system pressurised and the radiator literally split - dumping all the coolant and leaving far too big a problem for a quick fix. PWR in Brisbane were absolute legends - a new, beautiful aluminium radiator and pair of better performing fans were provided and fitted up just fine. All super until about 3 hours later when the head gasket appeared to blow out and we were flooded in coolant again.

This is where it all gets scary of course - head off, new gaskets etc etc - and after a painful wait and a healthy chunk of change it went back together aaannnd - once warm, went to hot, then very hot - then water was leaking from the engine again. Engine apart and there's water through it, so it's bad.

The mechanic has always done the right thing by us, so I know he's trying hard. He's checked the fans, thermostat, piping etc etc - and says they are all good. He's looked in the bores and thinks they're ok. That leaves the head, which he believes has an internal crack that is widening under heat, and causing the problems. It's gone off to a specialist - however it's a catch 22. If the head tests 'good' then WTF else could be wrong? If not, then were the funk do I start looking for a new 456 head!?

Any ideas muchly appreciated.
C'mon, do it!



Offline dkabab

no idea... but other things in the line, water pump, faulty sensors causing irregular coolant flow...
some sort of blockage maybe causing pressure to build up....



Offline allanuber


  • Joined: Aug 2007

  • Location: Sydney
  • Name: Al
That makes sense and I think we've tried flushing everything possible.

Factory price on new heads is $US8300 per bank ... so we're talking $25K aussie by the time they are landed here.

If it needs them, then that's the last straw for this car, I'm not tinkering anymore - will sell off the 456 motor and stick a f*cking LS7 in there.
C'mon, do it!



Offline mondi

  • Resident Bogan
  • Moderator

  • Joined: Jul 2008

  • Location:
  • Drives:
Nnnnnnnnnnnnnnnnoooooooooooooooo!!!!!!!!   :doh: :doh: :doh:


OK, could be completely wrong but I remember reading something about this once.
The 456 has two thermostats and if one or both are shot, it will overheat. The result of this was a cracked block or head, can't remember which one the article mentioned now(sorry).
There was something about the water pump being driven by V belt that caused an issue as well, but I can't find where I read it now!!!!

I think I found it on the California Ferrari owners website? And I think it was only by chance I happened upon it!  :(



Offline allanuber


  • Joined: Aug 2007

  • Location: Sydney
  • Name: Al

Have seen some of the same as well. Everything else has been double tested... so if it's a block or head crack, then its going to be megabucks to fix. The allure is definitely wearing off as they break often.

I could dump the car cheap and I'm sure someone would fix her up. Pay to fix it and await the next problem... or turn it into another racecar. Ditch the weight, drop in the ls7, rip out all the hydraulic suspension. It'd be worth nothing after spending all that money but i'd have a hoot in it.
C'mon, do it!



Offline dkabab

Have you posted this on fchat? Ive read through the 456/550/575 forum and there have been quite a few technical problems discussed in depth in there on the 456.
Even if you just have a quick browse through there, im sure you will find something similar. Might save some money rather than trial and error till you fix it. Especially if its going to be a new head  :doh:



Offline Ferrari Fissatore

  • Soap Dodger

  • Joined: Jan 2007

  • Drives: its obsession
  • Location: under its skin
probably started with simple air lock from restricted hose... here's a 550 header tank return hose.... you can see how they restrict inside like a cats arse...

But, now that it's airlocked, and steamed itself... the power of steam is immense.... impossible to say what has got broken, but there's no easy way to diagnose.

You have to fill and bleed 456/550 engines so carefully and thoroughly to avoid this.

you also have to run the heater once in a while to bleed air out... the heater pipes are too high, poor design. It's ok in cool climate with auto climate control, as the heater runs automatically, but in warm climate the heater stays off and water does not circulate properly. So you MUST make sure all the return lines are clear (there are 3... one from rad, one from each bank inside valley under inlet manifold).

Now it's busted, who knows what?

The 456 and 550 also have very clever triple pass flow radiators, I wouldn't be confident of correct construction of aftermarket radiator that fits the same size. typically, an aftermarket double pass radiator would need to be about 30% bigger than a standard 456/550.

You need to pressure test the cooling system and test it for hydrocarbon contamination. Both quite easy.



Offline Ferrari Fissatore

  • Soap Dodger

  • Joined: Jan 2007

  • Drives: its obsession
  • Location: under its skin
, then were the funk do I start looking for a new 456 head!?

Any ideas muchly appreciated.

eurospares

douglas valley

Ricambi

Rob Hayden  :thumbsup:



Offline Ferrari Fissatore

  • Soap Dodger

  • Joined: Jan 2007

  • Drives: its obsession
  • Location: under its skin
So you MUST make sure all the return lines are clear (there are 3... one from rad, one from each bank inside valley under inlet manifold).


you can see it all here, I'll correct myself slightly... there's one from the rear of the w/pump housing, one from the middle merge housing, and one from the top of the rad.




Offline dkabab

you can see it all here, I'll correct myself slightly... there's one from the rear of the w/pump housing, one from the middle merge housing, and one from the top of the rad.



at least the cam belt looks pretty easy to get to there.  :thumbsup:



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