Fume-me Interior.

[smallcox]

Hi 126 Fans,

I know if you own a air cooled 126 then on cold days you find the interior fills with fumes, or just wear 10 jumpers and turn the heating off.  I raise this topic because like others I spend hours on engine rebuilds to get a clean engine but you still find those fumes getting in.

I found what I beleive to be the problem, I know if your push rods or rocker cover gasket leaks then you no your on a loser, but if this is all good like mine suspect the head bolts. I spent hours cleaning my cyclinder head and when i remove it again it looks like vanish on the cooling fins (baked on oil)..

The 4 nuts under the rocker shaft that hold the head on have thick washers to spread the load but there are no seals on them. A design fault. I am going to have a go at making some seals in the head and see if this will improve the breathing conditions in the car.

Has anybody fitted seals with positive results?

Smallcox

[Darrell]

I've tried all sorts  replaced seals on intakes (foam) sealed-up intake with silicone all around the plastic box sections on the suction..

You must be on to something there, would a fibre washer under the sturdy washer not be man enough?

[skelz]

my car lets in lots of air through the front firewall...cant seem to close off

[smallcox]

There are lots off small holes in the front bulkhead, if you remove the vyinal cover you will see them. A bit off tape and silicon sealant work wonders

Seal under the washer is whats needed Darrell but you need metal to metal contact to hold the head down so going to have a go at fitting "o" rings under the washers

[ChrisRLewis]

Seal under the washer is whats needed Darrell but you need metal to metal contact to hold the head down so going to have a go at fitting "o" rings under the washers

Isn't there a chance of the o rings getting compressed with time with the result of the incorrect torque being applied to the bolts?

It's just a thought?

[Rusty's Uncle]

Fumes , I smell no fumes 

Re the O-rings , I am with Chris on that one. Just placing one under the washer would just make a mess of it. You would have to make special thicker washers with a groove onb the mating face and get O-rings that will take the temperature.

[dajwid]

I have never had a problem.

[bis13]

i think its the slow intake of fumes that adds to that heady experience of 126 driving.....after all we all know its a bit of a buzz.....

[smallcox]

I agree it 's the only high I get these days to

Yes I wasn't thinking off squashing the "o" rings straight under the washer, but have machined a recess for the seal to sit in that will not effect the torque-in down the head (see photo), the only problem the seal is against the thread but hopefully will be forced to seal.
The seal is fitted to the hole on the left and the hole on the right has the recess

Simple, just hope it works as this was defently leaking passed and smelling the car out when heaters on

[GTMaster]

I don't know, but i've never had problems with fumes getting in. I had the whole heating/cooling system pulled apart and cleaned out. No problems, except during winter in -15 deg. it wouldn't heat the cockpit up fast enough and i'd be driving blind  After 5kms hot air started coming through. I did however just buy a pair of those rubbers that go onto the spark plug leads that close off the holes in the top engine cover. Without them i realised a lot of air was being pushed out there which might have instead aided in getting more warm air into the cabin...

[smallcox]

I think mine is made more aparant because off the machining the heads had done