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motor smokes need help.

RootBreaker

RootBreaker

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ok on facebook and groups ive posted and down to u dont know.

let me help you with where ive gone.

truck sokes out of both exhaust sides...

someone said intake gaskets.
replaced and truck back together...
someone said valve guides..
and turn rocker nuts half turn each. did and no change...

so tomorrow ill do compression test...after that..if cylinders same..valve guides? smoke is bad.. fog machine. its nothead gaskets as truck has no waternow and still doing it.

other ideas?

20200208_204156.jpg
 
Is the PCV valve system set up correctly ?..aftermarket valve covers with no breathers can cause this...the PCV valve tries to pull in fresh air anywhere it can,including past the rings,gaskets,seals..

Did the oil get diluted with gas,or the crankcase overfilled with oil ?..that'll make it smoke bad too..
 
Wait No Water ..... how long has run with no water? How old is motor, has it been modified ? What color is smoke. What does it smell like?
 
Has it sat a long time? oil pressure? I wouldn't think valve guides, but maybe brittle/dried up umbrella seals on the valve stems if it's been sitting long.

The facebook advice was pretty comical BTW. :rotfl:
 
What color is the smoke?

Constant or does it eventually stop?
 
Should be fairly easy to figure out with that much smoke. But even the experts here need more info.
How long has it been doing it? Did it start suddenly or has been building up? How many miles on the motor? Is it a true dual exhaust or just dual tail pipes? If its an auto tranny, check the fluid. If you just recently had the oil changed at Jiffy Lube type place, stop everything and change the oil again yourself along with the filter.
Like Wes said, what color and what smell?
And whether or not the engine has water in it should not affect the smoke unless its white. But whether or not the engine has water does affect it's life expectancy. And lack of it will cause oil smoke down the line just before the engine seizes.
 
Loose valve guides or bad stem seals usually only make a SBC smoke upon start up for several seconds,then stop--or when coasting downhill,especially if you downshift ..if they were loose enough to smoke that bad constantly,it wouldn't run very good,and would foul plugs rapidly..

If it ends up being worn rings and low compression,some Lucas oil treatment in fresh oil will help reduce the smoke a lot..
 
Check the vacuum hose going to the modulator on the trans. Pretty common for the modulators diaphragm to break and cause the engine to suck trans fluid into the intake.

Unhook the vacuum line from the trans and see if any fluid comes out. If it does, replace modulator and your done.
 
ChrisPerry said:
Unhook the vacuum line from the trans and see if any fluid comes out. If it does, replace modulator and your done.
Click to expand...
Not quite. Also got to replace that little piece of rubber hose. Even with the new modulator, its going to be so swollen it will fall off.
Of course, the modulators used to come with that hose. Don't know any more.
 
I've had a bad brake booster let vacuum suck brake fluid into it from the master cylinder's rear piston seal over time,I had to keep topping off the fluid weekly--once enough fluid built up in the booster,the engine started belching white smoke bad,and the booster did not make much power assist,I had to replace it..

This was on my '72 K5..I was quite puzzled when I heard hissing and felt vacuum on the base of the master cylinder,it had a casting with a thru hole for the proportioning valve to bolt to it at the rear of the master,and the diaphragm in the booster was torn,I guess it let vacuum get where it wasn't supposed too..never seen another vehicle do that yet,it was weird..
 
motor is trashed. pulled apart.
cyl 6 piston... only 1 i pulled..
well bearing is toast so multiple issues. crank shot... all gritty.

20200711_145823.jpg
 
parting this out and also selling the 8.1L - thus will get rid of all this to figure something out in the future.
 
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Even though you are not going to rebuild it, I would suggest doing some investigating to try to find out what happened. Either the engine ran out of oil or oil pressure one time, got really really hot, or there is major problem with the air intake system.
A friend of mine bought a brand new Massey Ferguson tractor once. He noticed that for some reason the air cleaner never got dirty.
But the company had just redesigned it and put it in a better location, so he just figured it was sucking cleaner air than his old one.
Not long after he got it, I noticed a lot of blowby from the engine. Then it started using oil and developed a slight knock. Louder than the normal diesel sound.
He took it back to where he bought it, and they said it sounded like the engine was shot. Tried to blame him because he did not change the air filters. He told them he had, and even had the used one to prove it. When they pulled the hood off, they found that the air cleaner was not hooked up.
It seems that model was shipped from the factory with the air cleaner in a separate box and it was the dealer's job to attach it, pull the seal off the intake, and attach the hose. They did everything except attach the hose........

I doubt you have been running it with the air cleaner off, unless of course, you needed an excuse to install the 8.1...........
But something happened. I doubt you will be running the old air cleaner, but like TRustyK5 mentioned, I wonder if someone poured sand in the intake. I don't think it would work in the fuel, too many filters and orifices to go through.
Sugar on the other hand..........
Many many years ago, I used to know what to look for if there was sugar damage, but I can't pull it up right now.
Its a curse to know everything but not have it cataloged correctly............
 
BTW, there are lots of articles out there debunking the sugar in gas stories. The reason being that sugar does not dissolve in gas. However, it does dissolve very well in water, and its not uncommon to have a little in the bottom of a tank due to condensation. Not sure what the fuel we are using now will do, since alcohol causes water to emulsify in gas and tends to absorb water from the air. Then, at a certain concentration, precipitate out.
Boaters know all about this.
Either way, even if all it did was stop up the sock, sugar is not good in a tank. But to do the level of damage you showed, it would have to get into the engine.
 
yeah the air cleaner is on it and fairly sealed. not 100% but also with the snorkel, its pretty good...

im not going to get into tearing it down and figuring it out.

truck will sit until i figure something out.
 
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You got to make her think it was her idea to drop the 8.1 in your truck, talk to her about the motor being shot, then talk to her about how I need to sell the 8.1 to fund the new motor, let her connect the dots. And voila!
 
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