Kaboom!!!
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Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
Kaboom!!!
Well...
I hadn't driven the truck in a while, what with the floor being repaired and everything. But I needed to hear it run. So I threw an egg crate in for a seat and took it for a short drive.
Well, I get about 200 yards from my house, take off from the corner, like a normal, reasonable driver at maybe 1/4 throttle. All is well, until this nasty bang and subsequent knock that kills the motor. I can re-fire it, but the knock is still there and it wont run for more than 1 second. When cranking, I also note that it sounds like one cylinder is not building compression.
So I think something in the valvetrain went. I'll run a compression test tomorrow and pull the valve covers to see what went wrong. Right now I guess either:
1. Broke valve
2. Stuck valve and bent pushrod
3. Stuck valve and broke piston
4. Broke valve seat
Wish me luck...
I hadn't driven the truck in a while, what with the floor being repaired and everything. But I needed to hear it run. So I threw an egg crate in for a seat and took it for a short drive.
Well, I get about 200 yards from my house, take off from the corner, like a normal, reasonable driver at maybe 1/4 throttle. All is well, until this nasty bang and subsequent knock that kills the motor. I can re-fire it, but the knock is still there and it wont run for more than 1 second. When cranking, I also note that it sounds like one cylinder is not building compression.
So I think something in the valvetrain went. I'll run a compression test tomorrow and pull the valve covers to see what went wrong. Right now I guess either:
1. Broke valve
2. Stuck valve and bent pushrod
3. Stuck valve and broke piston
4. Broke valve seat
Wish me luck...
Posting Guru
Joined: Aug 2005
Posts: 1,036
Likes: 1
From: NE Ga
Dang dude sorry to hear! Keep us posted!!! If it makes ya feel any better, I was hoping to fire off my 390 today but just couldn't make it happen either! Bout another week or so...maybe two!!! Sheez
Posting Guru
Joined: Jul 2003
Posts: 1,268
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From: Eureka, Ca.
How long have the trucks been sitting? Gas goes bad very quickly these days. I ruined a carb with bad gas. Even after cleaning the tank and rebuilding the carb it never did run right. I finally had to buy a new carb. I have heard of bad gas causing stuck valves and doing this kind of damage.
Good luck! I hope the damage is minimal.
Good luck! I hope the damage is minimal.
Elder User
Joined: Feb 2005
Posts: 669
Likes: 1
Man that's tough. It's hard to come up with a reasonable explanation for that...you've had really good success with that engine and plenty enough run time to know it's reliable...I can't imagine how sitting for a while could do damage like this. Good Luck with it. Hey....I don't suppose you'd want to send me the adjustable rocker assemblies you have???? LOL.
Tracy
Tracy
Logistics Pro
Joined: Oct 2005
Posts: 3,785
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From: Mddl A MexCans
Ahhh hell! thats no good. Fires and runs for a second ?? I had mine do something like that when I forgot the main vac line on the back of the carb plate after the carb rebuild. Would start but not run for shiat, backfire etc.. just tossing it out there..hope it's nothing $$$ to resolve.. ,Redman
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Post Fiend
Joined: Jan 2003
Posts: 8,600
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From: Iowa
I appreciate everyone's good thoughts.
I should be able to look at it monday. Tomorrow I'm taking a trip to see a brother. On the plus side, I'll get to drive dad's new 2006 F150 XLT Super Crew.
Anyway, I've got some serious agressions that need to be released. Anyone know where I can get a punching bag? I've got the overwhelming urge to break something...
I should be able to look at it monday. Tomorrow I'm taking a trip to see a brother. On the plus side, I'll get to drive dad's new 2006 F150 XLT Super Crew.
Anyway, I've got some serious agressions that need to be released. Anyone know where I can get a punching bag? I've got the overwhelming urge to break something...
Posting Guru
Joined: Jul 2003
Posts: 2,232
Likes: 1
From: Colville, Washington
When I get that urge, I just go split firewood for a bit!!
It helps me anyway!
I would pull the valve covers before the compression test, it reminds me of my broken rocker shaft years ago.
It helps me anyway!I would pull the valve covers before the compression test, it reminds me of my broken rocker shaft years ago.
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Lead Driver
Joined: Apr 2001
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From: Texas
Originally Posted by Putt
When I get that urge, I just go split firewood for a bit!! It helps me anyway!
I would pull the valve covers before the compression test, it reminds me of my broken rocker shaft years ago.
It helps me anyway!I would pull the valve covers before the compression test, it reminds me of my broken rocker shaft years ago.
I usually clean out the shop fridge :-) maybe I should look into this firewood thing. Although, I don't burn very much down here :-)
Kurt, sorry to hear about your troubles. I'm sure you'll get it figured out and we'll all learn something :-)
Needsmorecoffee.
Joined: Oct 2004
Posts: 3,624
Likes: 2
From: CT
Kurt that stinks. Hopefully a easy fix with no major damage. I think Putt's onto something with the broken rocker shaft. I've had that experience also. Not a pleaseant one either. Good luck bud.
G.
G.
Fleet Mechanic
Joined: Jul 2000
Posts: 1,493
Likes: 346
From: SE Iowa
I take my agression out on the stump after cutting the tree down to split.....
BOOM!
Then the sheriff shows up and I have to explain things, but it sure is fun!
I had a somewhat similar experience with the 302 I had in a '77 Mustang. Was going down the highway, when I heard a load pop from the motor. I couldnt reach the key fast enough to shut it down. Ended up busting a rocker, which in turn push on the side of the valve spring just right to let the keepers loose and drop the valve. It was a sad day when I tore it apart. It has complete grenaded the #3 piston/rod and put a huge hole in the coolant passage. Let us know what you find.
Stryder
BOOM!
Then the sheriff shows up and I have to explain things, but it sure is fun!
I had a somewhat similar experience with the 302 I had in a '77 Mustang. Was going down the highway, when I heard a load pop from the motor. I couldnt reach the key fast enough to shut it down. Ended up busting a rocker, which in turn push on the side of the valve spring just right to let the keepers loose and drop the valve. It was a sad day when I tore it apart. It has complete grenaded the #3 piston/rod and put a huge hole in the coolant passage. Let us know what you find.
Stryder
Last edited by stryder; Apr 9, 2006 at 08:01 AM.
Cargo Master
Joined: Apr 2004
Posts: 2,574
Likes: 4
From: Golden, CO
Geeezzz Kurt, sorry to hear it. Sounds twisted but; three cheers for a bent pushrod. 
Long walks/hikes help to calm me. You could even say that my love of the outdoors has helped me stay married. LOL
Long walks/hikes help to calm me. You could even say that my love of the outdoors has helped me stay married. LOL
Posting Guru
Joined: Oct 2005
Posts: 1,235
Likes: 2
i find comfort in emptying the fridge as Gtex mentioned, and building a small gas ring fire around those cool little green propane bottles, then shooting them with the 9MM... i bent a pushrod and had the same problem, when the pushrod bent it sideloaded the rocker arm and then snapped it but no major internal problems.. Best luck and keep us posted..
Elder User
Joined: Apr 2004
Posts: 748
Likes: 0
From: North US Border, Canada
Well, it doesn't sound too good, hope for you that it's a simple fix with no serious damage. I think Greg has the right idea on how to release aggression, I seem to release aggression on a regular basis... even when I'm not angry. Problem with that is my fridge is down a flight of stairs, so it eventually becomes safer to switch over to coffee. LOL
Anyways let us know what's up with your truck when you know.
Goodluck
Madmike33
Anyways let us know what's up with your truck when you know.
Goodluck
Madmike33