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Well, in the search for my small exhaust leak I discovered that it was not the manifold, gasket or downpipe.
I discovered a crack in the turbo casting which is on the back-side of the exhaust scroll (the vertical surface of the scroll). The crack line starts around 12 o-clock and follows the scroll diameter, counter-clockwise around to about 8 o-clock. The crack is not where the scroll meets the exhaust pipe, but up on the face of the scroll.
It looks to be cracked along a casting line which is a result of the mold....also an alpha-numeric code stamped into this face around 8 o'clock where the crack seems to stop.
I have a parts car with another turbo but want to wait until it is warm to start smashing my knuckles on exhaust manifold bolts to get it off. Will start using penetrating oil now so my job is easier later, once I get it out from under the snow.
I am assuming the housing is cast steel. Or is it aluminum?? seems to dense for Al.
Hoping to get a local shop to possibly weld the casting in-situ if he can get his tip in there....should be room. As for heating the cast steel before welding I figure he can just run the engine for a while. Hoping this will keep the crack from getting any bigger until the spring when I can get the turbo out of the other car. Only driving it 120-150km a week anyways.
Has anyone else had any experience with welding cast steel manifolds or turbo housings? Any luck? Any tips?
I realize the best option is to replace it but I am looking for a quick fix here in the mean time.
Thanks in advance
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