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05-16-2017, 05:10 PM | #1 |
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Join Date: Mar 2013
Location: Campbellsville, KY
Posts: 888
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Say it ain't so: Wet plug on 454
Changed the plugs on my '85 454 the other night and they were all nice and consistent save for number 2 (right):
The lower electrode, insulator, and outer case look the same as all the others, but the upper strap had a damp, yellow-green residue on it. The engine has 125K on it with no other feedback to indicate it's burning water - clean oil and coolant, no noticable coolant loss, no steam out the exhaust, etc. Oil comsumption is a quart every 6-800 mi. but a large portion of that is valve seals and various leaks. Haven't done a compression test yet. How likely is it that, considering the position of #2's intake port in relation to the water passage, it's the intake gasket seeping and not a head gasket?
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Alex V. ------ 1967 C10 Suburban, 350/NP435, Green/Green, PS, PB, HD cooling, charging, shocks, and springs. 1985 GMC C3500 SRW, Sierra Classic, 454/TH400, white/blue. |
05-16-2017, 07:52 PM | #2 |
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Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,478
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Re: Say it ain't so: Wet plug on 454
Lacking any other evidence, wouldn't worry too much. Wait until time to add the next quart of oil and pull the #2 plug and check. Could be that set of valve seals is leaking a bit more then the others. If you know someone with a cylinder inspection tool, take a look after it has sat overnight.
Probably a lot of folks on this forum that wished our plugs looked that nice. |
05-16-2017, 08:08 PM | #3 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
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Re: Say it ain't so: Wet plug on 454
Heck that don't look bad at all for an '85! Wait till the oil and crud bridge the gap and the entire plug is black.
Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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05-16-2017, 08:22 PM | #4 |
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Join Date: Mar 2013
Location: Campbellsville, KY
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Re: Say it ain't so: Wet plug on 454
Ha - that's the main reason I'm paying it any mind from such a small indicator, I'd like to keep it that way. Near as I recall, before the leaks got worse (valve seals have shown signs since I got it in '07) it would take 1,200-1,500 mi. to use a quart. I'll run the new plugs a little and check it again, then maybe do a compression check just for good measure - never done one.
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Alex V. ------ 1967 C10 Suburban, 350/NP435, Green/Green, PS, PB, HD cooling, charging, shocks, and springs. 1985 GMC C3500 SRW, Sierra Classic, 454/TH400, white/blue. |
05-16-2017, 09:08 PM | #5 |
Post Whore
Join Date: Mar 2013
Location: Southern Oregon
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Re: Say it ain't so: Wet plug on 454
Run Power Punch through that sucker....that stuff will seal anything. haha They call it a Zinc additive....but man...it does more than that. My GMC's engine would burn about 1/2 a quart every 2 weeks(daily driven...only about 5 miles a day so the engine never gets very warm)....with power punch it took over a month.
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1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643 1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056 My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw |
05-18-2017, 02:18 PM | #6 | |
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Re: Say it ain't so: Wet plug on 454
Quote:
http://www.powerpunchinc.com/v/vspfi...S/SDS%20PA.pdf |
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05-18-2017, 11:29 PM | #7 |
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Join Date: Mar 2013
Location: Campbellsville, KY
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Re: Say it ain't so: Wet plug on 454
To each their own - I've been using Schaeffer's 7000 (15w40>10w30 the last two changes) and I have peace of mind with their formulation of zinc and moly. I also don't think the engine needs any internal cleaning because of the regular diet of Schaeffer's. Trying to band-aid the deterioration of the original 32 year old seals and gaskets with additives isn't my plan for this engine. Not that some of them don't work, but I intend to do whatever I can to see this engine another 125K - I can do any work short of rebuild machining that's necessary so all that's needed for any repairs is time and parts money.
I'm towing a CJ7 to St. Louis (700 mi. round-trip) with the truck next week and just want to minimize any chance of hiccups during the trip.
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Alex V. ------ 1967 C10 Suburban, 350/NP435, Green/Green, PS, PB, HD cooling, charging, shocks, and springs. 1985 GMC C3500 SRW, Sierra Classic, 454/TH400, white/blue. |
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