Post Reply
Posts: 56
Joined: Tue Nov 30, 2004 3:50 pm
Location: Ellicott City, MD

Resevoir Cap Specification

Post by shures »

Can you tell me the pressure rating for the resevoir "radiator" cap? My current cap is stamped 0.7 which I am certain is 0.7 bar. It no longer holds pressure. A replacement that I just received from a reliable vendor is stamped 0.5 bar. I verified it to that pressure with my testing equipment.

The only thing I find on cardisk is a system test pressure of 1.1 bar.
Scott Shure
Ellicott City, Md
85 GTV-6
User avatar
Posts: 4059
Joined: Mon Nov 29, 2004 12:26 am
Location: Gothenburg, Sweden

Re: Resevoir Cap Specification

Post by Mats »

Normally Aspirated engines 0.7bar, turbo 1.0bar. In my experience.
Mats Strandberg
-Scuderia Rosso- Now burned to the ground...

GTV 2000 -77 - Died in the fire.
155 V6 Sport -96 - Sold!
User avatar
Posts: 57
Joined: Mon Jul 12, 2010 2:30 pm
Location: Eindhoven, Netherlands

Re: Resevoir Cap Specification

Post by Melvivio »

There are many different ones available. Just start looking for one with 0.7 or slightly greater. Obviously running a too high pressure can cause damage to the engine or other parts of the cooling system. Newer cars run much higher pressures (1.2 etc) so I think best is 1 or close to.

This is the size of the Alfa cap. Maybe this will help you find a replacement part.
Black '80 3.0 24v GTV6. Flawed maybe, But absolutely glorious!
Post Reply