Heat exchanger

[dbrody]

I have a '69 912 with perhaps bad heat exchangers. I have exhast fumes in the cabin when I pull up on the heat lever. I'm thinking the heat exchangers are bad. How do I remove these (looks like two bolts -- one at top and bottom)? How do I tell if they are bad? Are there other replacements that are not as expensive?

Thanks

Dave

[Efrain68912]

If you have exhaust fumes in the cabin, I ink you have bad heater boxes (the ones that connect to the exhaust). Don't know if (or where) replacements are available.

Efrain
68 912

[Roland Kunz]

Hello

Those fumes where generatet by burnt oil and are not a sign from a bad exhanger. they are a sign from a oilleak wandering inside the exhanger trough a gap or a rusthole.

Exhaust gases are hard to smell only if the mixture is to rich.

Removing them is very simple by just removing the J pipes yet it sound simple but geting on that spot says use good tools and be patient.

Grüsse

[WFBowen]

If you have even the slightest feeling that you're getting exhaust through the heater ducts keep that heater lever off. CO poisoning is a very subtle and extremely dangerous proposition.