seized motor
Thread Starter
|
New User
Joined: Sep 2014
Posts: 17
Likes: 0
seized motor
Hey im knew here but ive got a 1974 f100 4x4 that has a seized motor im suspecting anyway, it was running just fine when it was parked a little more than a year ago and we swapped rear ends in the truck a few days ago and when we went to start it we got nothing. have since tried manually turning it by hand from the harmonic balancer bolt and still nothing, have pulled plugs and filled cylinders with various concoctions of penatrating oils and tried every couple of days and still nothing, so i pulled the pan and looked up underneith and everything seems to be fine as far as crank main bearings timing chain no rust around the pistons,......... im confused and looking for some help any input would be appreciated.
Thanks
Bryce
Thanks
Bryce
Laughing Gas
Joined: Sep 2003
Posts: 968
Likes: 5
From: Corbett, Oregon
Welcome to FTE. A bit of introduction goes a long way here, as well as pictures, if available.
If the truck was running and it seized up while sitting it a pretty safe bet the pistons and rings are stuck to the cylinders. Using the penetrating oil would have been my first move as well. I prefer to use a 50/50 mixture of ATF and Acetone. It seems to work better than most of the over the counter remedies I have found.
Have you drained the oil to make sure no water is present in the crankcase?
Is your truck a stick or an auto? If it is a stick can you have another rig tow, or push, your truck while you pop the clutch with the trans in high gear. Usually a sudden, sharp jolt will break an engine free.
If your truck has an auto trans you may need to use a pry bar on the flex plate ring gear and work the engine back and forth until it turns freely.
Good luck and welcome to FTE.
If the truck was running and it seized up while sitting it a pretty safe bet the pistons and rings are stuck to the cylinders. Using the penetrating oil would have been my first move as well. I prefer to use a 50/50 mixture of ATF and Acetone. It seems to work better than most of the over the counter remedies I have found.
Have you drained the oil to make sure no water is present in the crankcase?
Is your truck a stick or an auto? If it is a stick can you have another rig tow, or push, your truck while you pop the clutch with the trans in high gear. Usually a sudden, sharp jolt will break an engine free.
If your truck has an auto trans you may need to use a pry bar on the flex plate ring gear and work the engine back and forth until it turns freely.
Good luck and welcome to FTE.
Thread Starter
|
New User
Joined: Sep 2014
Posts: 17
Likes: 0
thnx for the quick replys, it is a stick and tried towing it with another pickup and still froze up. I drained the oil and pulled the pan too look up inside and couldnt see anythig real obvious, so my next thought was to pull the head maby and fill with acetone and atf just dint really wanna have too but thats the way it goes sometimes i suppose, any more quick tips would be appreciated thnx again
Fleet Mechanic
Joined: Jun 2013
Posts: 1,895
Likes: 32
Trending Topics
Senior User
Joined: Jan 2013
Posts: 290
Likes: 0
The catch is last time we dealt with an engine like that we had to bore it .040 over.
If you're planning on building it anyway, no big deal, otherwise you're probably looking at using some oil.
If you're planning on building it anyway, no big deal, otherwise you're probably looking at using some oil.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Thread Starter
|
New User
Joined: Sep 2014
Posts: 17
Likes: 0
thnx for all the info guys it broke loose last night under very little pressure was actually able to climb under remove dust cover for fly wheel and back it up finally. any ideas on what to run in it too help smooth things back out as best as possible?
thnx bryce
thnx bryce
Hotshot
Joined: Jan 2011
Posts: 13,147
Likes: 348
From: THIS IS SPARTA!, ...Mo.
If the rings were stuck (and it sounds like they were) they lost their seat to the cylinder wall. Use kerosene and ATF to free it up to the point it spins freely. After you're comfortable enough to start it, run it to operating temperature, then drip ATF down the carburetor. It'll reseat the rings. Of course, it's going to smoke like a freight train while you're doing this and you may need another set of plugs after that, but it should be ok after that.
Laughing Gas
Joined: Sep 2003
Posts: 968
Likes: 5
From: Corbett, Oregon
A quart of ATF through the carb should work wonders. I usually use Marvel Mystery Oil and follow the directions on the can.
Anything petroleum based with a high detergent content would work. There are several products on the market. The detergent will help to cut the old oil, gas and varnish from surfaces as well as help lube the top end.
Run the engine at a fast idle, 1500-2000 rpm and slowly pour whatever you are using through the carb and prepare for massive smoke.
Don't let the engine die. It might be hard to start.
Good luck.
Anything petroleum based with a high detergent content would work. There are several products on the market. The detergent will help to cut the old oil, gas and varnish from surfaces as well as help lube the top end.
Run the engine at a fast idle, 1500-2000 rpm and slowly pour whatever you are using through the carb and prepare for massive smoke.
Don't let the engine die. It might be hard to start.
Good luck.