Ive taken my exhaust and turbo off and luckily didn't break any bolts but some of the threads in the hotside are full of rust and crap. How can I clean them up so I can smoothly install new hardware? Thanks

 

Wire wheel on a dremel and some anti-seize.

 

Use the correct size tap, if possible.

If you can't find the right size tap, get some grade 10.9 bolts (the metric equivalent of grade 8), and some cutting oil. In a pinch, this can be as effective as a tap for chasing threads.

Example: Inexpensive Tap Kit

 

a tap will clean them up, spray some stuff on them while you turn the tap though

 

and I need an M10x1.25 correct?

 

what you want is a thread chaser, not a tap. A Tap might damage threads.

 

will local parts place have/know what im talking about?

 

Found (copied & pasted from this thread post #2 - O2 Housing Hardware) on another thread someone looking for hardware for their new o2 housing.
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The sizes are 10mm x 1.25mm pitch. Bolts are 25mm long

Here are the PNs of all the official fasteners..

Bolt - MD062961
Nut - MD050073
Stud - MR224441
Washer - MD132933

You can order whatever combo you want. You need 2 studs minimum, and 3 bolts,
but you do get all 5 locations as studs, then get the nuts and washers.

Order from www.mitsubishiparts.net if you want the "real" parts

Or, if your turbo has the studs, and they are in good shape, then go to Home Depot, NAPA, etc.,
and buy the bolts, nuts, washers. You want hardened - grade 8.8 fasteners

 

I know the size, I need to clean the threads up so I can install new hardware w/o any problems

 

Usa a tap with the same thread and you will be fine. The tap will only remove material in front of the cutting blade, ie rust.

I've done it many times to clean out threads in most of my cars...no issues whatsoever.

Otherwise talk to an actual machinist and see what they recommend yo use.

 

Ah, wasn't sure of the condition.

Tap for sure and some oil.

 

the problem with taps is that they can undercut the original threads, which can lead to a whole host of problems. Use the right tool for the right job. This is the whole reason thread chasers exist.

 

threads are prob 95% good? prob have a few small issue spots. mostly just trying to get the rust out.

 

also where can I get the new hardware locally? Lowes/Home Depot or big chain parts house? Grade 8? OEM bolts are crazy expensive.

 

Fastenel or ace hardware should work.