Alfa Romeo Forums banner

1 - 8 of 8 Posts

·
Registered
1991 Alfa Romeo 164 L
Joined
·
3 Posts
Discussion Starter #1
Hello, I just bought a 91 L model ( VIN: ZAREA43L0M6201339 ) and the previous owner said that the thermostat needed to be replaced. There's definitely a coolant leak there. I figured if I'm gonna get in there and try to figure that out, I should have a replacement thermostat on hand. Where should I look to get one? Any good guides or videos on this replacement that I can use to reference?

Bonus Question: May be a dumb question, but how do I tell if I have a 12V or a 24V model? I haven't been able to find it in the owner's manual or in this forum. Previous owner didn't know, he didn't work on it much himself.
 

·
Premium Member
Joined
·
9,868 Posts
I have thermostats in stock. 91 is a 12v engine. Thermostats are the same for both engines. Previous owner did not know what engine he had? Yikes.
 
  • Like
Reactions: AcroZach

·
Registered
1991 Alfa Romeo 164 L
Joined
·
3 Posts
Discussion Starter #3
Awesome, thank you! Was not sure how to differentiate, I've still got a lot to learn. Can you post a link to order from?

Ya, he had it as a hobby car, didn't do much work on it himself. But I got a good price on it! It's my first Alfa.
 

·
Premium Member
Joined
·
16,709 Posts
It's pretty simple to tell, really. The 12V engine has a distributor, the 24V doesn't. Also, the 12V engine has external sparkplug leads from the dist to the long plug connectors in the cam cover, the 24V does not have any visible plug leads, as they are all under the simple cover which has no plug holes.

Also, you should have spare thermostat bolts handy, in case you snap one off when removing them. It happens. When you try to remove the bolts, gently work the socket back and forth a little, and hammer on the head of the bolt a little to jar the threads. Continue to slowly increase the applied torque back and forth to slowly work the bolt loose. Do not just wrench on the bolt to loosen it, as you might just snap the bolt right off. Many have done just this.

I loosen the bolts just a little, work them back and forth about 1/4 turn, and then retighten about once a year just to keep them from freezing up in the threads.
 

·
Registered
1991 Alfa Romeo 164 L
Joined
·
3 Posts
Discussion Starter #6
Thanks for the tips! I'll definitely start doing this. What size bolts are they? And how long? I think I read 7mm somewhere but I don't remember.
 

·
Registered
Joined
·
3,261 Posts
A recent poster has two thermostats and housings available for free. Apparently

Woops gone already. Alfissimo will set you right, order the needed parts from him.
 

·
Premium Member
1991 164L
Joined
·
27,582 Posts
Thermostat bolts 15248711 bolts, thermostat M7x1.0x55mm long

Parts list for doing V6 164 12v timing belt , water pump and hose change.
AR p/n Nomenclature
60562106 timing belt
alt Dayco 95120 or 94423 size 134SX254
60588421 Tensioner , mechanical
60555347 water pump* alt 71713045 NOW 71737989
60777086 gasket w/p alt 60507414
60808356 hose sleeve to rear head NOW 60573501
60808355 hose sleeve to front head ALT 10129086 NOW 60604023
60615713 gasket, metal lower to top of pump or original paper gasket was p/n 60552316
15248711 bolts, thermostat M7x1.0x55mm long (3)
60507415 gasket, thermostat upper
60507416 gasket, thermostat mid housing
60559862 thermostat w/neoprene poppet or original early w/stainless steel poppet 60552314

60512902/60574777 belt, PS Dayco 15310 15529
60513889 belt, alt 5050273 Dayco 15527
60571636 belt, w/p 5070425 Dayco 15525
60507327 o-ring cam pulley hub (2) if needed
60610985 seal, cam pulley and aux shaft (3)
60510276 hose, long Top Radiator
60560822/60510278 hose, short lower/mid thermostat to steel pipe
60560859/60510275 hose, lower to radiator
60510277 hose, lower steel pipe to steel pipe
 
1 - 8 of 8 Posts
Top