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#1
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Rusty exhaust bolts
I'm changing the head on a 79 GMC truck. The exhaust bolts are very
deteriorated. They are a grade something. Can I buy the matching grade or a higher grade to replace them. Are all, say, Grade 5 or 8 bolts the same and usuable for the exhaust? I will be rebuilding this engine later this year and want to avoid problems later. Thanks all. Rojo |
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#2
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On Sat, 8 Jan 2005, Rojo2G wrote:
> I'm changing the head on a 79 GMC truck. The exhaust bolts are very > deteriorated. They are a grade something. Originally probably grade 2. > Can I buy the matching grade or a higher grade to replace them. Are all, > say, Grade 5 or 8 bolts the same and usuable for the exhaust? Yes and yes. You can even buy stainless steel bolts and studs, and brass nuts, and never again have a problem with hardware deterioration. |
#3
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Daniel J. Stern wrote: > On Sat, 8 Jan 2005, Rojo2G wrote: > > > I'm changing the head on a 79 GMC truck. The exhaust bolts are very > > deteriorated. They are a grade something. > > Originally probably grade 2. > > > Can I buy the matching grade or a higher grade to replace them. Are all, > > say, Grade 5 or 8 bolts the same and usuable for the exhaust? > > Yes and yes. You can even buy stainless steel bolts and studs, and brass > nuts, and never again have a problem with hardware deterioration. The higher grade bolts give you greater strength and not neccesarily better corrosion protection. Your best bet is stainless, but under the environmental condtions of the exhaust system, even stainless can corrode over time, but not nearly to the extent of regular steel. |
#4
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>even stainless can corrode over time
Will there be a problem with threading into an old cast iron exhaust? I guess I'm thinking like steel and aluminum joining problem. Thanks |
#5
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On Sat, 9 Jan 2005, Rojo2G wrote:
> > stainless > Will there be a problem with threading into an old cast iron exhaust? I > guess I'm thinking like steel and aluminum joining problem. Thanks No, there'll be no such problems. |
#6
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Rojo2G wrote:
>>even stainless can corrode over time > > Will there be a problem with threading into an old cast iron exhaust? I guess > I'm thinking like steel and aluminum joining problem. > Thanks retap or run a die over all old threads, as appropriate, and use anti-seize paste on reassembly. nate -- replace "fly" with "com" to reply. http://home.comcast.net/~njnagel |
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