GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Page 1 of 2 12 LastLast
Results 1 to 10 of 15

Thread: Seized Motor

  1. #1

    Default Seized Motor

    Looking for some opinions. 1984 3/4 ton Scottsdale 5.7L, 4 barrel carb, 4 speed manual, heavy duty cam installed when it was only a couple years old. No catalytic converter (3/4 ton didn't have them that year), around 187,000 miles. Truck did a lot of hauling and towing including a 29 ft camper. Had some electrical issues (fuse link replaced next to the firewall) and brake issues. My dad bought it new in 1983, always smoked a little taken to the dealer several times while under warranty and they could adjust to either white or blue smoke but never completely got rid of it. Only used about 1/2 quart of oil between 3,000 mile oil changes. Truck was my daily driver from 1990 till 2000 then switched off between it and my 1990 Silverado 3500 7.4L. I helped take care of this truck from the day my dad brought it home, I learned to drive in it, and it was my graduation present in 1990. As many on here can probably relate it is still my baby. History lesson over - didn't have time to deal with the electrical and brake issues so the truck sat for about a year and a half. Finally decided it was time to put it back on the road, everything was back in working order but it was running real rich. Several weekends I ran it around the farm figuring with the fresh gas it would clear up then one weekend while it was just idling outside the garage for about 10 minutes it just stopped. Oil level was full and oil pressure was running normal before it quit. When it stopped I was standing within 20 feet of the truck and didn't hear any noises it just sounded like you shut the key off. Now you can't turn the motor by hand and it very slowly turns over with the starter and doesn't attempt to fire (the plugs are sparking).

    Now for the opinions - should I have the motor pulled and opened up to see what happened and if feasible to fix it or just go straight for a new motor? Haven't done any research yet so I have no idea how expensive either option would be. Any opinions/suggestions would be appreciated.

    Click image for larger version. 

Name:	84 truck.jpg 
Views:	154 
Size:	59.3 KB 
ID:	53220

  2. #2
    Legend

    Join Date
    Jun 2006
    Location
    River Ridge Louisiana-4 miles W of New Orleans-didn't flood-water stopped 800 yards away.
    Posts
    1,612

    Default

    Cut open the oil filter-see if you see chunks or flecks of metal-same story when you drain oil-do it in clean container-look for metal flecks
    If you do-maybe pull oil pan-look for obvious problem
    No metal flecks could mean something relatively minor
    Lotta metal flecks means rebuild or replace maybe
    Luck
    Charlie
    1998 suburban-
    1/2 ton

    199500 miles
    River
    Ridge,LA

  3. #3

    Default

    weird...
    if it was dumping tons of fuel.... maybe it scored the cylinders/walls/rings... gas is a solvent, not a lube.

    either way, a new engine is the way to go. they come with outstanding warranties now. plus, you can message it before you put it in to make sure you get every bit of power you can from it.
    ive already built my replacement engine in my Summit Racing "wish list" on my account.

    just think about going with something smaller, like a 550 CFM carb. and not the factory quadra-jet....
    ill bet you any money though if you pull a head youll see some very sad cly walls lol
    Gas was $1.83 when Obama took office.....

  4. #4

    Default

    187,000 miles, just replace it, with that mileage rebuilding could get expensive if you need machine work.
    The ready availability of remanned and crate engines has made rebuilding financially questionable after adding new parts, machining, and man hours.
    The only real issue would be numbers matching.

  5. #5

    Default

    The only issue with dumping fuel would be drying the cylinders out
    This creating low compression and most likely did cyl wall damage
    Rebuilds are not bad if u do it yourself I've built several SBC engines
    One Vortec with 200k no machine work dropped in eagle assembly
    It goes both ways new or rebuild could equal the same
    The only warranty a rebuild has is how skilled a engine builder u are!

    Jasper crates go about 1400 down here

  6. #6
    Legend

    Join Date
    Jun 2006
    Location
    River Ridge Louisiana-4 miles W of New Orleans-didn't flood-water stopped 800 yards away.
    Posts
    1,612

    Default

    But like TB says-genuine GM Goodwrench rebuilds or new engines are CHEAP-
    $2000 CURBSIDE for his 5.7 I think
    My 1998 5.7 is just $2300 curbside-NEW GOODWRENCH-not a rebuild
    1998 suburban-
    1/2 ton

    199500 miles
    River
    Ridge,LA

  7. #7
    Sr. Mechanic JTWard's Avatar
    Join Date
    May 2013
    Location
    I live just south of Philadelphia, small community that sits on the Delaware River.
    Posts
    167

    Default

    If it was running, and oil pressure was OK, then it should still be Ok, Perhaps just a fuel pump? otherwise like phoebeisis & the others, buy a GM Crate Motor, they are about $2K or Edelbroock sells they own engines, ect, . . . with a buck 87 on the motor it is time for a new something new. 200.000 miles on it, you got all the good out of it.

  8. #8

    Default

    Well, the truck is fixed but now I am broke. GM performance engine 5.7L 290 hp, fly wheel, harmonic balancer, clutch fan, new starter, water pump, fuel pump, master cylinder, wheel cylinders, brake pads, calipers, emergency brake cable, all hoses, the list goes on and on. Now I have a leak in one of the gas tanks that I need to find and determine if patchable. Carburetor still needs some fine tuning after I run out the current tank of gas which is a mixture of old and fresh gas. Click image for larger version. 

Name:	84 truck2.jpg 
Views:	46 
Size:	66.1 KB 
ID:	54179

  9. #9
    Sr. Mechanic JTWard's Avatar
    Join Date
    May 2013
    Location
    I live just south of Philadelphia, small community that sits on the Delaware River.
    Posts
    167

    Default

    Boy, It looks great. Best of luck and I'm sure you'll really enjoy the flood gates of power being flung open.

  10. Likes 08silverado3500hd liked this post
  11. #10

    Default

    Looks great, now your ready for another 200,000 plus miles of good memories.
    I enjoy seeing older trucks go back on the road vs end up rusting away behind the barn or getting disassembled in a yard.

  12. Likes 08silverado3500hd liked this post
Page 1 of 2 12 LastLast

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •