Hi Larry,
The 512tr has 2 engine managements systems - one for each bank. The
water temp sensors (2) are for the ECUs
The 154283 is for the A/C system - unrelated to the cooling system.
I am pretty sure the part you need is 148677 which is a Jaeger
part. They are hard to get but still available from Ferrari in the
UK, and possibly here as well. I can check on Monday to see if any
dealer in the US has one and let you know.
If the gauge itself is the issue, then my first call would be to
palo alto speedo. www.paspeedo.com
If you need a new gauge, you can get a brand new one for about $225
- again from Ferrari in the UK. Part number is 147163 if your car is
a US delivered one.
Hope this helps, Dave
On 08/08/2015 05:20 AM, Larry Bard
wrote:
Peter,
Thanks for the response. The mechanic is a local
independent (Philadelphia area), Motorcar Makeovers.
Thanks also to Clyde and Lash for reaching out to me to
offer help. I need to try and contact each of you gentlemen
later today.
Can someone tell me if the temperature sending unit is the
same as what I see listed in a 512TR Spare Parts Catalogue"
as a "cooler temperature sensor" (#154283) and not, for
example, the "water temperature sensor" (#125769, of which
there are evidently two)?
A friend happened to be over yesterday on a completely
unrelated matter and said he might be able to help me. He's
an extremely experienced nonprofessional mechanic who does
absolutely everything himself on his Audis (but no Ferrari
experience), and is a perfectionist with deep
electrical-related knowledge. He said that if the sending
unit's electrical specs could be identified he might be able
to find me a much less expensive replacement Bosch unit.
Anyone know a source for such information? I gather that
part of what he has in mind is identifying the electrical
output of the sending unit at various coolant temperature
input readings.
From: dino308gt4 [at] hotmail.com
To: larrybard [at] hotmail.com
CC: ferrari [at] ferrarilist.com
Subject: RE: [Ferrari] 512TR temperature sending unit
Date: Fri, 7 Aug 2015 23:39:52 -0700
I've found with my ancient 308, anything
can (and will, given time) go. I had my speedometer fail
twice; once at the time of purchase and another many
years later. The first fix was easy, just cleaned the
connections at the sending unit and that lasted for
years. The second time it stopped working, I did the
same with no results. So I replaced the sending unit as
they are prone to failure (original large body style)
and the gauge still didn't work! So I replaced the
speedometer and now it's working again (which was a
monumental effort because I couldn't find a GT4-specific
speedo... I have no room in this email to write how
involved and complicated that was!).
The point is, both components need to be tested. Sending
units fail more frequently because they're in the
harshest of environments. But time is a harsh
environment as well! The gauge COULD be the culprit and
needs replacement.
As for pricing, well... Maybe try to make a deal? It's a
$700 job regardless if the gauge/sending unit total is
$200 and it takes almost four hours to do it, or if
you're lucky (he, he, yeah right), it only takes an
hour-and-half to do, but because of rarity, you're
talking about nearly $500 worth of parts. Still a $700
job. Maybe the pricing total reflects the possibility
this could turn into a BIG job and needs to be covered
for the "unexpected" (which always seems to be
expected!).
Who's the mechanic? Dealer or independent, or even
familiar with foreign cars?
Peter
From: larrybard [at] hotmail.com
Date: Fri, 7 Aug 2015 10:38:21 -0400
Subject: [Ferrari] 512TR temperature sending unit
CC: ferrari [at] ferrarilist.com
To: dino308gt4 [at] hotmail.com
Catching up with some month-long
issues after being away for the last 30 days
driving around the country (almost 9,000) miles
with two friends -- in their Ford hybrid. (Yeah,
would have been a lot more fun in one of my cars,
but they wouldn't have exactly gotten over 36
MPG.)
Anyway, just before I left my 1992 512TR went to a
local, apparently competent, mechanic for its
annual inspection. Everything was fine -- except
for (according to him) the temperature sending
unit, and (also according to him) the gauge
itself. I had noticed that the last few times I
had driven the car the gauge seemed to read
normally, and then stopped registering at all. On
and off, typically for minutes at a time. Cooling
system seemed to be working okay (fans coming on
when temperature reached about 195).
If I understood him correctly, the mechanic wants
to charge me $350 for both (not each) a new
"temperature sending unit" and replacement gauge,
plus an additional $350 labor. They would first
replace the sending unit, and if the gauge then
worked properly of course not replace the latter,
but they said that based on their tests the gauge
was not sweeping correctly.
I am almost undoubtedly one of the least
mechanically knowledgeable people on this list, so
please forgive the possibly naive questions, but:
- if indeed the sending unit is
malfunctioning, I would have guessed that the
gauge might well not also need replacement
because it might be functioning properly, with
the erratic readings solely attributable to
the sending unit. So what are the chances
that the sending unit needs replacement, but
not the gauge? (Seems easy enough to do what
they propose and change the sending unit first
and then see if the gauge is working correctly
before also replacing it; and if the mechanic
were one of my regular trusted mechanics I
wouldn't be wary.)
- Assuming, for the moment, that both the
sending unit and gauge require replacement,
$350 sounds to me to possibly be excessive
parts cost and labor cost for replacing just
the former (a quick search shows that a
sending unit is apparently available from
Rutlands for about $60 plus shipping), and
possibly even for replacing both. (All
Ferrari Parts seems to sell gauges for $165.
http://www.allferrariparts.com/147163.html )
Any thoughts would be appreciated.
Thanks,
Larry
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