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#1
03-31-2008, 09:18 PM
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Unsticking a stuck engine--your tips?
So I have this 455 out there and it was stuck. I sprayed some WD in the cyl and let it sit overnight--nothing. So I fabbed a BIG lever to attach to the crank at the rear and put some trans fluid in the cyls. It moved a little. So I worked it back and forth and found that it had a little bit of a sticking point where it must've sat for a while.
It will rotate now, but it is nowhere as free moving as I'd like it to be. What would you do at this point? I put more trans fluid in and inserted the spark plugs again. Thanks, |
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#2
03-31-2008, 09:32 PM
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I heard diesel fuel works well or brake fluid???????????
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#3
03-31-2008, 09:40 PM
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Years ago I broke loose a 66 Wildcat 400 engine that was seized. I filled the crankcase up till the dipstick tube overflowed, including the cylinders with light oil. I let it set that way for two weeks. Eventually I was able to break the crank loose by hand with a breaker bar and patience. I would turn it a little at a time and let it set for a few days in between. After it turned over by hand with ease I drained the oil, refilled correctly and changed the filter.
When I got it started and tuned, we drove it for several years at my old place of employment. It was actually a very reliable car and surprised us. From your description, your engine sounds to be in better shape than ours was to start with. You may be fine if you are patient with it.
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 ___________________________________ "Objects in mirror are closer than they appear" 
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#4
03-31-2008, 09:41 PM
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Aero Kroil hands down the best penetrant out there. Not cheap though.
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#5
03-31-2008, 11:25 PM
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Ive used diesel fue on 2 engines in the past both came loose in a few days just fill it up and let it soak .
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#6
03-31-2008, 11:42 PM
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My Monza was stuck after 19 years in a garage. Literally, I pulled the plugs, filled the cyliners with PB Blaster, and let it sit for 1 week. I put a bar on the crank nut and it turned right over. I then spun it with the starter and blew PB all over the garage. Cool. I've never used anything better on a stuck, rusted, anything. The best part, you can buy it by the gallon...
__________________
 "Trust me friend, a hundred years goes faster than you think." -Kenny Chesney "Go fast, turn left, hang on, go straight, go faster...who wouldn't wanna piss off 900 angry horses?" 1967 Pontiac Firebird 400 Coupe 1966 Chevrolet Corvair Monza 110 Convertible 1965 Oldsmobile F85 Cutlass 350 HO Coupe, soon to have Olds 403 1970 Chevrolet Nova 383 Coupe, NEW! 2007 GMC Sierra 5.3 Z71 Ext. 2007 GMC Yukon 5.3 SLT |
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#7
04-01-2008, 12:09 AM
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I had a neighbor, an older guy who was into vintage tractors....he swore by brake fluid....If I remember right he used to warm it up before he would pour it into the cylinders....
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#8
04-01-2008, 12:59 AM
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Marvel Mystery oil is the best I've found. When I worked in the starter field, we had a 52 Plymouth towed in because it wouldn't start. After testing, it appeared to be a bad starter[it just drew 500 amps and wouldn't budge the engine]. I pulled the starter and tested it and it was fine. The engine was siezed up solid as a rock. When I told him the bad news he said it used to run fine. I suggested that he fill the cylinders up with Marvel Mystery oil and let it soak for a week and try it. Two weeks later he came driving up in that old Plymouth. Said he did the Marvel trick and it turned over after a week or so and he started it up and it has been running fine. He thanked me for the suggestion and went along his way.
That stuff works very good. I have unstuck several other engines with it also.
__________________
Paul Carter Carter Cryogenics www.cartercryo.com 520-409-7236 Koerner Racing Engines You killed it, We build it! 520-294-5758 64 GTO, under re-construction, 412 CID, also under construction. 87 S-10 Pickup, 321,000 miles 99Monte Carlo, 293,000 miles 86 Bronco, 218,000 miles |
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#9
04-01-2008, 07:20 AM
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Another vote for Marvel Mystery oil.
That's what we use on old tractors that have been sitting outside for many, many years. I also had a guy here at work say that CocaCola works well, too (I'm serious). K 
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'63 LeMans Convertible '63 Grand Prix '65 GTO - original, unrestored, Dad was original owner, 5000 original mile Royal Pontiac factory racer '74 Chevelle - original owner, 9.85 @ 136 mph besthttp://www.superchevy.com/features/s...hevy-chevelle/ My Pontiac Story: http://forums.maxperformanceinc.com/...d.php?t=560524 "Intro from an old Assembly Plant Guy":http://67-72chevytrucks.com/vboard/s...d.php?t=342926 Last edited by Keith Seymore; 04-01-2008 at 07:49 AM. |
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#10
04-01-2008, 07:43 AM
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Quote:
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-Joe 1965 GTO Clone- 455- 4 spd-3.08 rear-Fontaine Blue |
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#11
04-01-2008, 08:16 AM
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Oh yeah, I did use Marvel about 20 yrs ago to unstick a Datsun 1600 engine. It sprayed the stuff all over the car next to it when it let loose.
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#12
04-01-2008, 08:26 AM
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I use compressed air to break it free. Heres how I do it. All spark plugs out . Smart bet would be to loosen rockers too. Penetrating oil in all cyls.
Find any piston at TDC or the cyl with the piston closest to TDC. Use the fitting from your compression tester or leakdown tester with sparkplug thread on one side and quick disconnect on other side. Screw it into the cyl you selected near TDC. Stand aside and hook up the air hose from your compressor to the air fitting. Motor breaks free with a large bang. Soak times and penetrating oils are up to you. Heres the math.... 4.15 bore. 13.52 square inches of area. 100 pounds per square inch = 1350 lbs of force pushing down on piston. Try that with a breaker bar. You can turn up air pressure for more force if necessary. |
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#13
04-01-2008, 08:45 AM
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I just did one with 2 cans of PB Blaster. The wife said it stunk up the basement. 2 days and I was able to take it apart.
__________________
 frittering and wasting the hours in an off hand way.... 1969 GTO, 455ci, 230/236 Pontiac Dude's "Butcher Special" Comp hyd roller cam with Crower HIPPO solid roller lifters, Q-jet, Edelbrock P4B-QJ, Doug's headers, ported 6X-8 (97cc) heads, TKO600, 3.73 geared Eaton Tru-Trac 8.5", hydroboost, rear disc brakes......and my greatest mechanical feat....a new heater core. 
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#14
04-01-2008, 09:34 AM
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That's the only down side to the PB, it definitely has it's own, unique smell...
__________________
"Trust me friend, a hundred years goes faster than you think." -Kenny Chesney "Go fast, turn left, hang on, go straight, go faster...who wouldn't wanna piss off 900 angry horses?" 1967 Pontiac Firebird 400 Coupe 1966 Chevrolet Corvair Monza 110 Convertible 1965 Oldsmobile F85 Cutlass 350 HO Coupe, soon to have Olds 403 1970 Chevrolet Nova 383 Coupe, NEW! 2007 GMC Sierra 5.3 Z71 Ext. 2007 GMC Yukon 5.3 SLT |
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#15
04-01-2008, 09:38 AM
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Similar idea to above.
Pull plugs, spray PB in the cylinders, let soak over night. WITH PLUGS IN, turn motor as much as you can. The compression pushs the PB around the rings and down the walls.Nice thing about PB, it lubes as well as dissolving light rust. Repeat once a day for a week. Has worked for me in the past.
__________________
"resurfacing Pa highways 2 long black strips at a time" 78 Olds Cutlass Drag car PONTIAC powered with 440 (destroked 455), th400, 12bolt with spool 4.10z Best to date 10.00@130.92 mph at 3250# 79 Grand Prix, will be new home for the 440 Goal 9.75z@135mph at 2900# 83 Malibu Wagon UUV Crate 350, Custom T5, 8.5 with Auburn posi 3.73z Making it the Ultimate Utility Vehicle Go, tow and show (not so much show, yet) |
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#16
04-01-2008, 12:18 PM
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One more vote for PB Blaster.
Stuck 400, pull plugs and spray each cylinder til full. Next day use breaker bar on pulley rotate 90 degrees, more PB. It turns over really easy and doesn't wipe away as easy as WD-40. |
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#17
04-01-2008, 01:03 PM
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Heck, I was afraid to use PB, not knowing what it might do to softer metals like cam & crank bearings.
PB smells like a bug spray we used in pest control. |
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#18
04-01-2008, 02:03 PM
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The compressed air sounds like a pretty good idea to me.
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'67 GTO Conv 400 TH400 |
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#19
04-01-2008, 03:56 PM
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My Vote........PB blaster have used is on a stuck sbc that I could not move at all! Let it sit for a couple of days then could move it and ran it worked great.
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#20
04-01-2008, 05:17 PM
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Quote:
__________________
Dave "Big Injun" Anderson dave@4mypontiac.com www.4mypontiac.com For GTO Celebration items click the tile coaster. 
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