Join Date: Jun 2009
Location: Saipan (!)
Mad Max is offline
Re: Coolant leak from somewhere
Actually, it's the aluminum that will corrode. The stainless is impervious... Why do you think they use stainless in hospitals??
I have heard people say not to use stainless on aluminum and that the corrosion factor increases...
I don't know if you are familiar with Buick V8 timing cover/water pumps...
I have several Buicks with this problem: GM used 1/4 - 20 X 1/2" mild steel bolts to hold the pump on along with 3/8" x 6" to go through the pump/cover to the block.
How many times have the small bolts snapped???? I can't count them. Why? Severe corrosion. I have replaced the bolts on 3 of my Buick engines with stainless and used anti seize on the threads. On my 68 GS 400, I installed a performance cam. Guess what... I removed the STAINLESS bolts and not only did they come right out, but they had no corrosion. IIRC, I changed the water pump about 12 years before I changed the cam.
I think the critical factor is stainless won't corrode, but the aluminum will be the sacrificial metal here. The trick here is to coat the entire stainless fastener with anti seize - which is what I do - this will act as a barrier to prevent galvanic reaction between the 2 metals.
When mild steel fasteners are used, they have a much larger corrosion factor and will deteriorate faster than the aluminum.
BTW, ever worked on an outboard engine? Do you know what they use for fasteners on their aluminum blocks??
Uh huh... Stainless....
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.