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09-07-2017, 11:23 AM | #1 |
Alright Alright Alright
Join Date: Mar 2004
Location: Midland, Texas
Posts: 1,672
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White build up in a brand new aluminum water neck
I just installed a brand new aluminum thermostat housing on my 350 and after replacing the crappy gasket it came with, I noticed a white mushy film coating the inside. It's only in the housing and not in the radiator hose. It washed off easily and there is no real signs of pitting. It has to be a chemical reaction with the aluminum. Does this mean the coolant ratio is off?
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1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies |
09-07-2017, 11:30 AM | #2 |
Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,590
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Re: White build up in a brand new aluminum water neck
most likely oxidation...did you use distilled water in your system?...
http://www.aa1car.com/library/coolin..._corrosion.htm |
09-07-2017, 01:18 PM | #3 |
Alright Alright Alright
Join Date: Mar 2004
Location: Midland, Texas
Posts: 1,672
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Re: White build up in a brand new aluminum water neck
That is probably my issue.
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1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies |
09-07-2017, 05:12 PM | #4 |
Active Member
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: White build up in a brand new aluminum water neck
Aluminum reacts with certain chemicals in the coolant. I've had bad luck with aluminum t-stat housings corroding before and usually wind up replacing them every couple of years or so.
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68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive... |
09-08-2017, 11:29 AM | #5 |
Senior Member
Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: White build up in a brand new aluminum water neck
Make sure you have good clean grounds from the block to the cab, block to battery, as well as cab and bed to frame. Sometimes the pot metal thermostat housings act as an anode and will deteriorate quickly. Using hard water in your coolant system promotes the electrolysis effect.
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American" |
09-08-2017, 04:43 PM | #6 |
Active Member
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: White build up in a brand new aluminum water neck
^ This year I learned another thing about dissimilar metals and water. About 4, 5 years ago I had a leak in my galvanized pipe water supply line to the house. I spliced it and used a brass coupling on the line. Earlier part of this year I had another leak and found the brass coupling had corroded enough to create a leak. Apparently brass and galvanized metal don't get along where there's water involved.
__________________
68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive... |
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