Thursday, October 27, 2022

Alfa GTV6 Coolant Fan Switch

 Alfa GTV6 Coolant Fan Switch

The Alfa Romeo GTV6 uses a coolant fan switch in the radiator to turn the fans on and off.  This 2-prong switch is located on the driver's side of the radiator, just above the lower radiator hose. When the temperature of the coolant leaving the radiator reaches a set point, the contacts close in the switch and fans turn on.

Alfa GTV6 Radiator Fan Switch

The thermostat on an Alfa GTV6 begins to open up at 176°F (80° C).  The coolant fan switch in the radiator turns the fans on at 183.2° - 190.4 ° F (84-88° C).  A coolant temperature sensor in the thermostat housing controls the temperature gauge in the car and turns on the overheat warning light at 221°F (105°C). 

Alfa GTV6 fan switch washers

My Alfa GTV6's radiator coolant fan switch is marked to turn on at 187° F (86° C)  and turn off at 169°F (76°C). When you install this switch, use a new 22MM aluminum sealing washer. By the way, this is the same size as the GTV6's oil drain plug washer, so you may have one. The wrench size is 1 1/8 inch or 29mm. Alfa Romeo also recommends using anti-seize on the threads to help sealing.

Alfa Romeo GTV6 Radiator Cooling Fan Switch Specs

  • Temperature: 183.2 - 190.4 ° F (84-88° C)
  • Tightening Torque: 14.5 - 18.1 (20 - 25 Nm)
  • Wrench Size: 29mm or 1 1/8 inch
  • Thread Size: 22x1.5mm Thread size
  • Sealing Washer Size: 22MM Aluminum
  • Sealant: Anti-seize
  • Alfa Romeo Part Number: 60506988

The good news is this 2-prong switch is a common design and used by other car companies like Fiat, VW and Audi, so it is readily available. Note, you may have to modify your connector to use a non-original one. Also, be careful to match the temperature specifications. 

Click The Link Below to Read More:

Alfa Romeo Cooling System Specifications

Tuesday, October 25, 2022

Alfa GTV6 Timing Marks

Early USA GTV6 Timing Marks

The Alfa Romeo GTV6 is not an ordinary car, and some of its mechanical components have a bit of an enigma surrounding them. One of these features is the mysterious markings on the crankshaft pulley used for ignition and valve timing. It is essential to have a perfect understanding of these marks, or you can get into trouble, so stick around.

81-83 Alfa GTV6 Timing Marks

While most cars use numbers or hashmark either on the crankshaft pulley or timing cover to verify engine timing, the Alfa GTV6 uses a confusing bunch of letters. On top of that, depending on if you have a US or Euro-spec car, only some of these letters coincide. So if you don't realize you are using a Euro-car repair manual or a North American manual, you can get screwed up. Fear not; we'll help decipher these letters like a pro.

Alfa GTV6 Timing Marks Early USA

Looking at the crank pulley on a North American GTV6, you will see R, F, P, and M etched into the crank pulley. This differs from Euro-spec cars that just have P, F, and M. 

The letters correspond to the following Italian words:

  • R - Ritardato or Retarded
  • F - Fisso or Fixed
  • P - Punto or Point/Dot
  • M -Massimo or Maximum

Above the crank pulley, there will be a pointer on the front engine flange that you line up to these letters.

Early Alfa GTV6 Timing Mark

Alfa GTV6 TDC Timing Mark

On a 1981 -mid-1983 North American GTV6, the marks correspond to:

  • R- 5° +/- 1° ATDC (After Top Dead Center)
  • F and P - TDC (Top Dead Center)
  • M - 26-29° BTDC (Before Top Dead Center)

 Early US GTV6 Timing Spec

Base ignition timing at the 800 -1000 rpm idle with the distributor vacuum line connected should be at the R mark (or 5° +/- 1° ATDC). Note, with the vacuum hose disconnected, timing will advance to the P (TDC) mark.

Timing at 5,000 with the distributor vacuum line disconnected should be at the M mark ( 26-29° BTDC).

Late Alfa GTV6 Timing Marks

Late GTV6 Timing Marks

On some late-1983* and newer North American GTV6, the marks correspond to:

  • P - TDC (Top Dead Center)
  • F- 2° BTDC (Before Top Dead Center)

Cars from about late-83* and up use the Bosch EZ-L digital electronic ignition system where you just set initial advance. The distributor's internal centrifugal advance mechanism is eliminated and combined within the electronic control unit. In addition, a vacuum advance capsule boosts part-throttle performance and fuel economy during part throttle operation. 

Initial ignition timing at the  950 +/- 50 rpm idle speed with vacuum hose disconnected is 2° BTDC. 

European Alfa GTV6 Timing

European Alfa GTV6 Timing Marks

  • P - TDC (Top Dead Center)
  • F-  7° - 10° BTDC (Before Top Dead Center)
  • M - 28-31 ° BTDC (Before Top Dead Center)

The European GTV6 ignition system is similar to the early North American car's setup. Different initial timing, advance curve, and the elimination of vacuum retard are the main differences.

Euro GTV6 Base Timing

Base ignition timing at the 850 -1000 rpm idle with the distributor vacuum line disconnected should be at the F mark (or 7° - 10° BTDC). 

Euro GTV6 Max Timing Mark

Timing at 5,000 rpm with the distributor vacuum line disconnected should be at the M mark ( 28-31 ° BTDC).

Alfa GTV6 Top Dead Center Mark

Alfa GTV6 TDC Timing Mark

  • P - TDC (Top Dead Center)

The P mark on the crank pulley corresponds to TDC on all GTV6 models. 

Timing Mark Degreeing the GTV6 Crank Pulley

My Alfa GTV6 Timing Marks

If you own an Alfa Romeo, you likely enjoy modifying and trying to improve its performance. If you are doing an engine mod, accurately knowing the crankshaft degrees during an event like ignition, valve opening/closing, etc., is vital. With the marks you have on the crank pulley, you can figure out the distance of each degree and mark them off. For example, on my North American 1982 GTV6, every degree is approximately .040" or 1.016mm apart. 

Alfa GTV6 Crank Markings

I have a European distributor installed in my car and want to time my engine at 10° BTDC. I simply measured the distance between P and R (equals 5°) on my crank pulley and came up with approximately 5mm. So, I placed 2 marks 5mm apart BTDC, corresponding to 5° and 10°. Simple. You could do that all around the crank if you desire.

* Documentation shows 1983 50 State (California) emission compliant GTV6 models came with the late ignition systems.

Wednesday, October 19, 2022

Alfa GTV6 Cooling System Specs


Alfa GTV6 Cooling System Diagram
1 Thermostatic valve, 2 Water thermometer sender and thermal switch for coolant temperature warning light, 3 Heater, 4 Heater valve, 5 Heater valve control, 6 Coolant temperature warning light, 7 Coolant thermometer, 8 Radiator, 9 Electric fan, 10 Electric fan thermal switch, 11 Pump, 12 Header tank, 13 Header tank cap, 14 Electric fan relay

When you are doing work on the cooling system of your Alfa GTV6, having the specs come in handy.  To save you time, here are some of the ones I've needed to find in the middle of a job. .

You will note that there is an Alfa Romeo recommended a coolant system sealant.  In the old days, OEM manufacturers would add a coolant sealant to help seal the system on brand new cars!

Alfa GTV6 Cooling System Specs

GTV6 Coolant Capacity: 

  • 3.2 gallons / 12 liters

GTV6 Radiator Testing Pressure

  • 15.6 psi (1.1 bar)

GTV6 Radiator Cap Pressure Rating

  • 12.8-15.64 psi (.88- 1.08 bar)

GTV6 Thermostat Temperature

  • initial opening: 180-185°F (81-85°C)
  • fully open: 200°F (95°C)

GTV6 Radiator Fan Cut-In Temperature

  • 185-190°F (84-88°C)

GTV6 Coolant System Tightening Torques

 Water Pump Retaining Bolts

  • 6-6.9 lb/ft (8.1-9.3Nm)

Water Temperature Transmitter on thermostat housing

  • 14.4-18 lb/ft (20-25 Nm)

Engine Temperature Sensor on thermostat housing

  • 10.8lb/ft (15 Nm)

Thermo-time Switch on thermostat housing

  • 21.6lb/ft (29 Nm)

Radiator Cooling Fan Switch

  • 14.4-18 lb/ft (20-25 Nm)

Anti-seize Thread Sealants:  

  • Water Temp Transmitter, Engine Temperature Sensor, Thermo-time Switch threads  on                       thermostat housing.
  • Threads on Cooling Fan Switch in Radiator

Cooling System Sealant

  • Arexons Sealing Powder 4.5 oz (12grams)
  • Alumaseal Powder


Alfa Romeo GTV6 Cooling System Diagram

Source: Alfa Romeo Service Manual, 1981 NA GTV6 Technical Specifications

Welcome to My GTV6 Website


1982 Alfa GTV6

Welcome to my Alfa GTV6 website! This place is dedicated to my Alfa Romeo GTV6 and helping others keep their GTV6 on the road. I've owned my GTV6 since 1986, but I parked it 20 years ago when my son was born. So now the time has come to start enjoying my car again. But time hasn't been too kind, so follow along as I get my car road worthy again. We'll have plenty of tech and info to help you, too!

Thanks for visiting!


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