Marks Inside TD05H Turbine Housing

[Leighos]

I opened up an old TD05H-16G that I had lying around to inspect its internals and found these unusual marks on the inside of the turbine housing, anyone seen this kind of thing before? Wondering if its usable or only fit for the scrap bin.

I tried to take the best pic I could, still might be kind of hard to see what it is...I know it looks like pitting but in some ways it remind me of a weld that has been ground back as it feels slightly raised when I run a finger nail across it, but surely no!

When I\'m back at work I might give the whole thing a good bead blasting and maybe put a bit of engineers blue on that area, that might show it up a bit better.

[lachlan]

first glance it looks like corrosion

then it looks like built up alloy from the comp wheel rubbing on it

do you think it has lost material from stock or it has built up from stock

id get some wet n dry on it and still use it .

[Leighos]

 lachlan said:

first glance it looks like corrosion

then it looks like built up alloy from the comp wheel rubbing on it

do you think it has lost material from stock or it has built up from stock

id get some wet n dry on it and still use it .

It does appear to be slightly raised which is what concerns me, and just in that area of the housing too - the rest is quite smooth.

The turbine wheel itself does have some tip erosion, but the area where that blades are radiused (where the corresponding marks are) don\'t appear damaged.

I\'m just concerned that if someone has welded this up in the past for whatever reason, maybe to fill excessive corrosion, that there may be a cracking issue from dissimilar metals - I\'ve tried welding cast manifolds on older vehicles (1940\'s) before, it aint pretty and is always trouble later down the track.