A Stuck Valve

[blank]

Gary,

I once watched a mechanic restart a Ford Falcon motor that had been sitting
so long it was locked up. He squirted a couple ounces of Marvel Mystery oil
in each cylinder and let it sit a day. This freed the engine up. He added
a quart of MMO to the crankcase and had another quart standing by while a
helper attempted to start the engine. When it finally fired up, it would
barely run and the helper did his best to keep it above 2000 rpm. The
mechanic began slowly pouring the remaining quart of MMO into the carburetor
and, by the time the can was empty, the engine was running smoothly. Of
course the smoke was so thick you couldn't see the back end of the car.
This recollection is almost 30 years old, but the details are still pretty
vivid.

I don't know that I would recommend pouring down the carburetor as this
could easily result in hydraulic lock if you don't do it right, but I'd
definitely try MMO in the crankcase before pulling the head.

Patrick

>
> It appears to have a stuck intake valve (popping back
> through the carb). I'm going to do a compression
> check and find out which cyl. Does anyone have an
> idea about how I can get this to unstick without
> tearing the heads off? Should I put a quart of Diesel
> in the oil? Mystery Motor Oil? Anything else?
> Remember, this engine has sat for 10 years now, and
> ran swell when they shut it down for the last time.

 

[wayne newland]

Gary

I worked for the Wynn Oil Co for almost ten years teaching mechanics to use the
product line. Go find a can of Wynn's Tune Up and while you're at it, buy a can
of Wynn's Supreme. Pour both in the oil. Tune Up will burn off in about 15
minutes and it will free up stuck valves. Supreme will stay in the oil and coat
the metal surfices, reducing friction (it is the professional succussor to
Friction Proofing). Diesel fuel is NOT good for the insides of your engine. If
you can't find a retailer (try Firestone and Goodyear stores) look up Wynn's on
the net and find out where they have a dist. in your area. They are located in
so.Calif., 1-800-645-8101.

Good luck

Wayne Newland F9300 75 Palm Beach Columbia, (digging out of the "Storm of the
Century") Md.

> Hey All;
>
> We finally got this 76 PB 455 running. Changed all of the fluids and
> rubber lines under the hatch. For the most part it sounds good. Good oil
> pressure. Temp comes up to 1/8th on the scale (orig temp sensor). It appears
> to have a stuck intake valve (popping back through the carb). I'm going to
> do a compression check and find out which cyl. Does anyone have an idea
> about how I can get this to unstick without tearing the heads off? Should I
> put a quart of Diesel in the oil? Mystery Motor Oil? Anything else?
> Remember, this engine has sat for 10 years now, and ran swell when they shut
> it down for the last time.
>
> GaryB and Larryb
> 2 76 PBs in Ca.
> ______________________________________________________
> Get Your Private, Free Email at http://www.hotmail.com

 

[blank]

Gary, if after you find out which valve is stuck via the compression check,
you will remove the corresponding rocker cover, then the rocker arm of the stuck
valve, soak the valve with a good penetrating oil for a while. Then take a
hammer and gently tap on the top of the valve. If the penetrant has soaked in,
the valve will come loose. This is assuming that whilst the valve was stuck that
it didn' come into contact with the piston, in which case the valve will be bent
and you will have to pull the head. Much good luck to you.
Pat 77 Birch

> Hey All;
>
> We finally got this 76 PB 455 running. Changed all of the fluids and
> rubber lines under the hatch. For the most part it sounds good. Good oil
> pressure. Temp comes up to 1/8th on the scale (orig temp sensor). It appears
> to have a stuck intake valve (popping back through the carb). I'm going to
> do a compression check and find out which cyl. Does anyone have an idea
> about how I can get this to unstick without tearing the heads off? Should I
> put a quart of Diesel in the oil? Mystery Motor Oil? Anything else?
> Remember, this engine has sat for 10 years now, and ran swell when they shut
> it down for the last time.
>
> GaryB and Larryb
> 2 76 PBs in Ca.
> ______________________________________________________
> Get Your Private, Free Email at http://www.hotmail.com

 

[hawk ii]

KEN

you asked about:
piston hitting the valve
Do you know that it can happen on the 455/403? I have
no idea. I hope someone does know and will tell me.

ANS: unfortunately - yes our engines will and do hit
the valves. I know - had two valves stick on me - one
hour after I put my brand new rebuilt heads back on.
I was lucky - they just touched the piston - bent the
valve stem and left a very small mark on the piston
head. Seems that the rebuilder set the valve stem
clearance on the tight side. -- cost me 8 hours of
work to take the heads off and have them done again -
this time by the " boss "

=====
Pete Papas-->http://members.tripod.com/~mehawk_ii/index.html
. ___________ (MY TOYS) (904)672-0571
./_][__][] []| 1973 GMC M/H 1976 Bi-Centennial Harley M/C
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[kara m kosier]

Gary,
Thirty-five years ago, when I was service manager in a Ford dealership,
we had a lot of problems with stuck valves and lifters. My factory service
rep recommended putting a quart of ATF in the crankcase. He said that
they had found that the ATF had a very high detergency value and
would dissolve the varnish that was gunking things up. Since that time,
I have used that system on numerous occasions. (I've owned a lot of
less-than-perfect vehicles.) For cleaning out combustion chamber
deposits, I like a product called Cleens, available at your local GM
dealership. OUTDOORS, you pour two-thirds of the can thru the
carburetor, taking care to keep the wind on your side. ( If this stuff
isn't
toxic, it gives a good imitation.) Then, dump the remainder down the
carb, stalling the motor. Wait half an hour, then go for a fast run down
the highway. (This is the part I always liked.) You can usually look in
the rear-view mirror and see the crud flying out the tailpipe. This is a
good cure for any vehicle that is driven very sedately.
End of sermon.
Gary Kosier
- ----- Original Message -----
From: Gary Berry
To:
Sent: Wednesday, January 26, 2000 11:20 AM
Subject: GMC: A Stuck Valve

> Hey All;
>
> We finally got this 76 PB 455 running. Changed all of the fluids and
> rubber lines under the hatch. For the most part it sounds good. Good oil
> pressure. Temp comes up to 1/8th on the scale (orig temp sensor). It
appears
> to have a stuck intake valve (popping back through the carb). I'm going to
> do a compression check and find out which cyl. Does anyone have an idea
> about how I can get this to unstick without tearing the heads off? Should
I
> put a quart of Diesel in the oil? Mystery Motor Oil? Anything else?
> Remember, this engine has sat for 10 years now, and ran swell when they
shut
> it down for the last time.
>
> GaryB and Larryb
> 2 76 PBs in Ca.
> ______________________________________________________
> Get Your Private, Free Email at http://www.hotmail.com
>