It was running fine and then

[icanfixit]

I have been driving the 320 around the neighborhood for the past week. All was fine until yesterday a intake valve stuck open.  I have to open the side cover up and see what has happened. My fear is a broken valve spring. Anyone know where to find then if I need them?

Thanks
Chris

[porin 170/220]

Hi,

You can try to ask on this address.
http://www.prewarcar.com/classifieds/ad177975.html

Here is another interesting link for you maybe.
http://www.oldtimerholz.com/referenzen/mercedes_170.html

Best regards
Porin

[Stephen Dietrich]

I would check with Henry. He should know.  Stephen

[icanfixit]

I took a look inside the valve covers and did not see any obvious problems. No broken springs. The engine is compressing fuel back up through the carb. It is on a rhythm like only one cylinder.  All is good at idle till you advance the throttle or put a load on the engine. It acts like the intake valve is not closing and the compression stroke is pushing the fuel/air mix back out the intake and up the carb.

I will do a compression check next to see which cylinder it is. I am not looking forward to taking the head off again. I hope this can be an easy fix.

Chris
 

[icanfixit]

Cylinder 4 and 5 have 20# compression. Looks like a blown head gasket. I m going to get a custom one made. Now I just need to decide on thickness and material.

Chris