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Spark plugs again

S

SVcummins

Well-known Member
Sand blasted the spark plugs now Ill brake clean them good
and run them . Picked up a plug gap tool for 2.50$ made in
the USA
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cvphoto111083.jpg
 
Your going to love that blaster. If you get a rich running engine with carb problems and it soots up the plugs and fouls them you can just blast them and they will work again. Been using mine for 20+ years.
 
The 72 gmc dump truck. It fouls a set about twice a year . The 15 50 oil helped slow the fouling quit a bit it doesnt get enough use or miles and still runs pretty good I cant see over hauling it right now. I woolens mind trying replace the valve stem seals at some point just not real high on the list at the moment when the trucks that actually do the work around here need repairs
 
I dont have one yet . I took these to the auto parts store in the neighboring town and they let me use their cabinet for free .
 
Don't waste your time with the valve seals, tried that on our truck years ago. Took a qt of oil in 15-20 miles after that. Mechanic friend warned me before hand, should have listened.
 
I noticed that also after I sand blasted a few plugs. I flattened out a nail to get down deep into the bottom. Stan
 
Some plugs like to catch sand. My tool is a rewind spring from a briggs about 5 inches long. Sharpened and pointy end.
 
Dont hurt to try valve seals. Sure not going to make it worst. Replaced them many times. Its an afternoon job. One way to check is let it idle a bit and then when u stomp on it you get a blue puff of smoke out the exhaust. Nothing needs to come apart other than removing the rockers. Just use air in each cyl at tdc. And remove keepers and replace the seals. Then readjust your valves and done.
Most likely the valve guides are worn so that means the heads are due for rebuild.
 
(quoted from post at 20:37:46 12/16/21)

Engines operating on NG, LP or unleaded should wear out spark plugs instead of fouling spark plugs .
Coolant temps of 195F, lean mixture and high viscosity low ash oil will reduce fouling .
Click to expand...
 
Your engine is worn out, but sandblasting the plugs is finishing it off. 350 engines are cheap, why not just fix the problem if you use this truck heavily?
 
Plugs look nice.On your older chevy truck I would recommend using the anti foul adapter on the bad cylinders until you replace the engine or rebuild the engine.They will get you by for a while. Good luck
 
I agree with Sprint on this. I guess I haven't followed this thread, but if you have a SBC for an engine, rebuild it. If you don't want the downtime, there are literally hundreds of places to buy a rebuilt long block. I used to (halfway) recommend the new Targetmaster directly from GM, at least for your application, but they have priced themself out of the market.
 
Yes probably the guides, I have had good luck just getting a set of heads done and installing a new cam shaft and lifters. The trouble with bad guides in a truck is you tend to do engine braking with that vintage of truck and it really pulls the oil in. But doing valve seals and making sure the drain back holes are open would be a start.
 
Years back we had access to these. Now I make my own with Popsicle stick and 2 number 32 rubber bands. I have a ford and dodge trucks that have been run like that for many years. They have light duty use around the farm.



A final variation on the basic spark plug theme you should know about is something NGK calls a booster gap, and is known at Champion as an auxiliary gap. By any name it's an air gap built into a plug's core, and it improves resistance to fouling.
 
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