Stuck valve

[Dave8N in Pa]

My 8N seems to have an exhaust valve stuck open. I can hear it thru the exhaust. Or it's a burnt valve. Either way I can hear compression thru the exhaust. So, where do I start? Should I soak each cyl. with MM first? Where do I start?

 

[Dell (WA)]

Dave........where should I start???......the "infamous" compression test. Ford specs: 90psi min, 110psi on good runnin' engines; BRAND NEW about 125psi. 2nd thing, MMO is good fer un-stickin' thangs and so is ATF (automatic transmission fluid) Guess which is cheeper??? Iff'n you really gotta burned valve (intakes NEVER burn) and can walk on water, yer gonna be pullin' yer engine and taking it to a machine shop. You can NOT grind the valve seats in frame. .......HTH, Dell

 

[TheOldHokie]

(quoted from post at 13:45:29 11/08/15) My 8N seems to have an exhaust valve stuck open. I can hear it thru the exhaust. Or it's a burnt valve. Either way I can hear compression thru the exhaust. So, where do I start? Should I soak each cyl. with MM first? Where do I start?

Step 1: Remove the valve over and look to see if it is stuck.

TOH

 

[tractorguy2]

What is MM?
Your FORD is a flat head. Soaking the cylinders won't help the valve much.

Remove the side valve covers and spray some BP BLASTER on the valves. Try work the valve up and down with a screwdriver,pliers, or any tool that Wil work.

 

[R Geiger]

Marvel Mystery Oil, about the same as ATF but more expensive.

 

[wellmax99]

For what it's worth,
I had an old jeep wth a sticky valve, the old dude at the local Napa store said there were two solutions for a sticky valve.

1. First try 1/2 qt MMO in the crankcase, 1/2 qt MMO in the fuel tank, then drive it around for a while

2. Second, if this does not work, you are going to have to tear into the motor and have it repaired.

What type oil are you using, when was it and the filter changed, have you just changed to different type oil from what has been use in the old tractor?

Solved the sticky valve problem in my jeep that was years ago, I still add MMO at each oil change, jeep is still running like a top.

 

[Dave8N in Pa]

Thanks TOH, I had thought maybe MM would flow down the valve stem. Guess I'll try your way. Thankyou!

 

[Ultradog MN]

I still believe MMO is better than ATF.
On a flat head if you take the plugs out and add a couple + tablespoons of mmo to each hole then turn the engine over by hand the oil will flood over the valves and some of it get on the stems and free up the stuck one.
You can also remove the valve cover on the side
and spray the valve stems from underneath.
Getting oil from both directions onto the stem will usually free it up.

 

[Tall T]

Back when I was a dealer, I used this product with some success.
Don't inhale it or you'll burn out a heart valve. It is sprayed into the carb throat at a fast idle.
Powerfoam

 

[tractorguy2]

I've got the tools to grind flat head Ford valve seats. Used them on my 9n back in 06.

 

[Dave8N in Pa]

Thanks UD, I think I'll try your idea. I'm sure it help the rings. You and TOH both think I should pull the cover and I'm going to. But I'm going to try MMO first. Thank you sir.

 

[ZANE]

You can grind the valve seats in frame. I've done hundreds of them????

I have both the pilot to do it with the guides in and the pilot to do it with the guides out.
Zane

 

[ZANE]

A couple of years ago a friend of mine called me and asked me to come start his 8N. Shed kept dry. No manure?
Had no compression. Of course I assumed that the cam gear etc was shot. Pulled the front off. Cam perfect.

Pulled the tappett covers. All eight valves stuck open????? Never seen anything like it???? Had only been a couple of months since last run.

Lots of Deep Creep etc and tapping the valves down at the bottom of the springs. Finally got them all free.

Started and ran perfect.

Has not done it again?

What do you suppose did this?

Zane

 

[Den N Ms]

I have also ground many valve seat on flat head engines in frame,4-6 and even some 8 cylinder engines,Pontiac and even Hudsons.With my old Souix seat grinder.

 

[Dell (WA)]

hey Denis........how many neubie shadetree mechanics have valve grinding tools??? I stand by my recommendation, taker to a machine shop 'cuz they have valve grinding tools.........respectfully, Dell, who does NOT have valve grinding tools but I can adjust valves and carbies

 

[Hobo,NC]

(quoted from post at 23:45:29 11/08/15) My 8N seems to have an exhaust valve stuck open. I can hear it thru the exhaust. Or it's a burnt valve. Either way I can hear compression thru the exhaust. So, where do I start? Should I soak each cyl. with MM first? Where do I start?

You should start by verifying the complaint...

Google "compression test"

 

[kylemorley]

Many years ago I was having trouble with valves in my 8n and bought a valve kit in the hope I could install it without removing the engine. I needed to get the seats ground and went to the mechanic who ran a little repair and tow shop in the middle of town and asked if he might be able to stop by and do it at my place since he was only a couple mile saway . He said OK but when I was ready to have it done he was in a frantic mood and said he could'nt possibly squeeze the job in for several of weeks. He then started racing about his garage digging up parts and machines, and presented me with a valve grinder, and said I could barrow it and do the job myself. I'd never used one before, but took it home and ground the seats, then lapped in the new valves. Despite my total lack of experience with the procedure the tractor ran fine after I bolted the head back on and continues to now 30 or so years later.

I don't doubt I may have done something terribly wrong and just lucked out, but I would be interested in knowing what it was.

Oh, used to be a guy in our area who had a gadget for grinding cranks in frames.

 

[souNdguy]

I think it is crap fuel.

I have had valves stuck on 2 red tigers. my 63 4000 and my 850.

In the 4000 they stuck closed and i bent 6 push rods!

on the 850 I got lucky and it was a stuck open..

 

[RTR]

(quoted from post at 04:17:49 11/09/15) You can grind the valve seats in frame. I've done hundreds of them????

I have both the pilot to do it with the guides in and the pilot to do it with the guides out.
Zane

would you care to share where you got the tools? I don't need to buy something I'll use probably once.

 

[RTR]

(quoted from post at 04:17:49 11/09/15) You can grind the valve seats in frame. I've done hundreds of them????

I have both the pilot to do it with the guides in and the pilot to do it with the guides out.
Zane

would you care to share where you got the tools? I don't need to buy something I'll use probably once.

 

[Hobo,NC]

(quoted from post at 02:54:12 10/18/22)

(quoted from post at 04:17:49 11/09/15) You can grind the valve seats in frame. I've done hundreds of them????

I have both the pilot to do it with the guides in and the pilot to do it with the guides out.
Zane

would you care to share where you got the tools? I don't need to buy something I'll use probably once.

Its gonna be interesting to see if Zane reply's to this post.

 

[RTR]

I know, but it's worth a shot.

 

[JMOR]

(quoted from post at 17:04:37 10/17/22)

(quoted from post at 02:54:12 10/18/22)

(quoted from post at 04:17:49 11/09/15) You can grind the valve seats in frame. I've done hundreds of them????

I have both the pilot to do it with the guides in and the pilot to do it with the guides out.
Zane

would you care to share where you got the tools? I don't need to buy something I'll use probably once.

Its gonna be interesting to see if Zane reply's to this post.

ong distance

 

[Hobo,NC]

(quoted from post at 03:34:11 10/18/22)

(quoted from post at 17:04:37 10/17/22)

(quoted from post at 02:54:12 10/18/22)

(quoted from post at 04:17:49 11/09/15) You can grind the valve seats in frame. I've done hundreds of them????

I have both the pilot to do it with the guides in and the pilot to do it with the guides out.
Zane

would you care to share where you got the tools? I don't need to buy something I'll use probably once.

Its gonna be interesting to see if Zane reply's to this post.

ong distance

RIP

 

[Hobo,NC]

He probably got it like I did, it came in a used seat grinder kit. I spec the grinder dated back into the 50's are early 60's when flatheads were still being serviced.

Back then it was not uncommon for a small garage to have those tools. You did not farm valve work out like you do today it was all kept inhouse as much as possible.

What are you attempting to do.

 

[Jim.ME]

(quoted from post at 17:26:58 10/17/22)
I know, but it's worth a shot.

Apparently, you missed this in previous discussions involving Zane. Zane Sherman passed away in August of 2018.

 

[RTR]

(quoted from post at 07:26:00 10/18/22)

(quoted from post at 17:26:58 10/17/22)
I know, but it's worth a shot.

Apparently, you missed this in previous discussions involving Zane. Zane Sherman passed away in August of 2018.

Oh gosh! That is long distance! RIP Zane.