Fiat 126 Chat => Fiat 126 Mechanical Problem Solving => Topic started by: phreak97 on March 20, 2019, 12:01:21 PM

Title: Avoiding burnt valves?
Post by: phreak97 on March 20, 2019, 12:01:21 PM
I’ve just done some head work on my 1990 air cooled after losing compression on my second motor. I discovered both motors plus my parts motor had heavy pitting on the exhaust valves which caused leaks.

Is this a well known issue on these cars? Is there any preventative?
Title: Re: Avoiding burnt valves?
Post by: Xylaquin on March 20, 2019, 10:11:18 PM
Could it perhaps need some lead replacement additive?
Title: Re: Avoiding burnt valves?
Post by: phreak97 on March 21, 2019, 12:22:10 AM
Could it perhaps need some lead replacement additive?

Possibly, I thought that affected the seats but I guess both?
Title: Re: Avoiding burnt valves?
Post by: 126Simon on March 31, 2019, 07:40:35 AM
Running lean resulting in high combustion temps?

Sent from my SM-G925F using Tapatalk

Title: Re: Avoiding burnt valves?
Post by: phreak97 on March 31, 2019, 08:03:58 AM
Running lean resulting in high combustion temps?

Sent from my SM-G925F using Tapatalk
I don’t think so, it’s happened on three different engines (and carbys). one wasnt even from my car.
Title: Re: Avoiding burnt valves?
Post by: DEYAN IYI on June 10, 2019, 02:57:14 PM
If the seats need to be changed, you can use metal-ceramic ones. Not sure exactly the name of the material but it is used in LPG conversations for example.
Title: Re: Avoiding burnt valves?
Post by: phreak97 on June 10, 2019, 11:27:49 PM
If the seats need to be changed, you can use metal-ceramic ones. Not sure exactly the name of the material but it is used in LPG conversations for example.

The head is back on now, I built it with second hand valves and lapped them in, I didn’t really have any money to spend on it. We’re running valve saver additive now.

The seats were fine anyway, just the valves were getting eaten away.
SimplePortal 2.3.6 © 2008-2014, SimplePortal