Why is my exhaust smoking on hills?

[912E931]

I am hoping someone can point me in the right direction. I am getting my 1976 912E back on the road after sitting for a time. I am noticing that it will blow white smoke once it is warmed up. This only seems to happen when I am going down hills. Anybody know what would cause it to smoke only under these circumstances? It is fine around town at all speeds until I hit a hill.

[Flieger]

So you are engine braking when going downhill? If you accelerate, does the smoke stop? If so, that sounds like worn valve guides.

[C. Clark]

Worn valve guides is the most obvious answer, that said excessive oil in the crankcase can also cause white smoke. Since you're noticing this in out of level situations I would look into that first. Try running a little under the full line and see what happens.
One of the worse things for a vehicle is being idle, seals dry out, gaskets fail, all kinds of bad stuff.
Best of luck,
Chas.
356912911

[912E931]

Thanks for the insight. I will start checking these out.