Stainless bolt for turbo exhaust flange?????

[groundpounder]

Hello again. I found out the size bolt I need now I need to know what grade bolt to use. Can stainless be used in the cast turbo housing? Or do I have to use something job specific??? Thanks again!! (exhaust flange bolts are missing)

 

[ynot]

Wouldn't use stainless. Too soft. I use Zinc Dichromate #8's on everything. You can get Titanium turbo bolts from Cat, but they're pricey ($5. 25+ per)... T

 

[B.G. Smith]

Good advice on the stainless. Stainless is bad about galling and if you ever have to drill or cut it out it's more difficult than carbon steel. Any grade 5 or 8 will work fine. A grade five bolt will have three radial marks on the head, Grade eight would be six marks or just an eight I think metric bolts are marked different, 8. 8 would be equivalent to grade 5. 10. 9 and 12. 9 would be higher grade bolts. bg

 

[Alan Reagan]

I'm with ynott. The stainless and the steel in the flange are dissimilar metals and the stainless will seize the flange material and they will try to become one. Not a problem until you need to remove it. Even after using antiseize on my stainless thermocouple in the exhaust manifold, I almost couldn't get it out after just 5000 miles.

 

[NVR FNSH]

IMO - use the factory bolts, try the Cummins shop. It is a high heat application. I believe they are spec'd for the job... .


brian

 

[HEMI®Dart]

I'm not positive on the studs, but the Cummins/Dodge OE nuts are Stainless steel.

 

[illflem]

ynott,good advice on the stainless. Many folks think stainless steel is strong when it really isn't,it's just what the name implies-stainless. I've seen higher quality European engines use brass studs with SS nuts on the exhaust manifold. Nuts never seize,no broken studs.

 

[HEMI®Dart]

How come Stainless Steel is so tough to drill through if its not hard?

 

[JB @ C and L Machine]

Hemi. . there are too many types of stainless to name, We use alot of 304L(L for leaded)... it cuts like butter. I did some some 316Ti(Titanium) bearing housings that went to Singapore, boy were they tuff to cut. . Some of the 400 series stainless even rusts... JB

 

[ynot]

HEMI, stainless (standard) is hard to drill because it doesn't have a high carbon/ iron backing, which would make it "porous" enough for the bit to bite. It's too smooth to grab on to. The factory exhaust and turbo nuts are nickel/ titanium M10. 8/ 10X1. 25. Same material Cat uses. Less heat seizing and gaulding... T