Here's an overheat question - Alfa Romeo Forum
You are currently unregistered, register for more features.    
 
Thread Tools
(Post Link) post #1 of 8 Old 04-08-15 Thread Starter
Status: -
AO Member
 
tinonline's Avatar
 
Join Date: Jul 2012
Location: United Kingdom
County: Berkshire
Posts: 15
Garage
Arrow Here's an overheat question

Hi

What cooked first: the chicken or the egg?

I've a 155 1.8 sport. 8valve. Serious overheat led to replacing knackered water pump, thermostat and head gasket.

Thermostat was only a couple of years old. Rest is probably original.

Any ideas what the originating problem was ? For example does a thermostat get damaged if overheated?

What's the usual pattern of failure on these engines?

Be interested to know your thoughts.
tinonline is offline  
Sponsored Links
Advertisement
 
Status: #keepFightingMichael
AO Gold Member
 
EauRouge's Avatar
 
Join Date: Jun 2009
Location: Suriname
County: Brokopondo
Posts: 7,703
How old was the coolant? Out of date coolant can destroy a cooling system and engine block over a couplea years.
EauRouge is offline  
(Post Link) post #3 of 8 Old 04-08-15 Thread Starter
Status: -
AO Member
 
tinonline's Avatar
 
Join Date: Jul 2012
Location: United Kingdom
County: Berkshire
Posts: 15
Garage
Quote:
Originally Posted by EauRouge View Post
How old was the coolant? Out of date coolant can destroy a cooling system and engine block over a couplea years.
Not more than two years but my be the % was too low. My gut feel is the head was going...the overflow bottle is dirty brown...like the soil colour of the Spanish region the car lives in. But it didn't seem like oil...
tinonline is offline  
Status: -
AO Silver Member
 
JON156VELOCE's Avatar
 
Join Date: Jun 2011
Location: United Kingdom
County: Cardiff
Posts: 3,119

Member car:

Giulia Veloce

Its very rare for a faulty thermosat to cause overheating, they are designed to fail in the open position to just cause the engine to run cold. This is for any engine.

What was wrong with the pump.? Leaking or the impeller come loose.? chances are that it was either the lack of coolant circulation either by the pump not pumping or because of air in the cooling system that caused the engine to overheat which then blew the head gasket
JON156VELOCE is offline  
(Post Link) post #5 of 8 Old 05-08-15 Thread Starter
Status: -
AO Member
 
tinonline's Avatar
 
Join Date: Jul 2012
Location: United Kingdom
County: Berkshire
Posts: 15
Garage
Quote:
Originally Posted by JON156VELOCE View Post
Its very rare for a faulty thermosat to cause overheating, they are designed to fail in the open position to just cause the engine to run cold. This is for any engine.

What was wrong with the pump.? Leaking or the impeller come loose.? chances are that it was either the lack of coolant circulation either by the pump not pumping or because of air in the cooling system that caused the engine to overheat which then blew the head gasket
Thanks, I'll be having a look at the parts in a few weeks. I'm not exactly sure but suffice to say I don't have a problem replacing water pump or thermostat (again) along with head gasket.
tinonline is offline  
(Post Link) post #6 of 8 Old 28-08-15 Thread Starter
Status: -
AO Member
 
tinonline's Avatar
 
Join Date: Jul 2012
Location: United Kingdom
County: Berkshire
Posts: 15
Garage
Quote:
Originally Posted by JON156VELOCE View Post
Its very rare for a faulty thermosat to cause overheating, they are designed to fail in the open position to just cause the engine to run cold. This is for any engine.

What was wrong with the pump.? Leaking or the impeller come loose.? chances are that it was either the lack of coolant circulation either by the pump not pumping or because of air in the cooling system that caused the engine to overheat which then blew the head gasket
I've posted on a new thread - head gasket...looks like that went after wearing away!
tinonline is offline  
Status: -
AO Member
 
Join Date: Jul 2012
Location: Bulgaria
County: Sofia
Posts: 170
Did the fans turn when they were supposed to ?
pyle is offline  
Status: -
AO Member
 
Join Date: Aug 2014
Location: United Kingdom
County: Somerset
Posts: 42
Hi might be big air loock,first head gasket gone this might let air to the system as u don't need Mach to overheat engine,Olso clogged rad,or fan running on one speed(u have two speeds),fermostat can be faulty and did not allow coolant to travel to matrix that's whay people say if yors car overheat turn heat in car as water going to matrix so circulate in block......
tomasz is offline  
Reply

Go Back   Alfa Romeo Forum > Supported Alfa Romeo Models > Technical & Vehicle Assistance > Engines (TS, JTS, JTD & V6)

Tags
overheat , question

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome