Well lets just say I have been in on more than my share!!! Finishing a job (engine replacement) from one that broke. Yes I was operating it. I have tried to be easy on stuff but it happens everything from small engines to big diesels. Seen flywheel and balancer ends snap off, break in the journals, even seen then break at an angle and engine would still run!!! So lets hear your stories
- Thread starter JOCCO
- Start date
DENNIS MIN
Member
jocco,
Unfortunately, I had stripped the harmonic balancer threads out of the front of the crankshaft of an auto engine.
It was completely my fault. Certainly embarrassed and not proud.
I didn't think it through when I put the balancer back on. A few high speed engine revs proved how poorly I had done.
D.
Unfortunately, I had stripped the harmonic balancer threads out of the front of the crankshaft of an auto engine.
It was completely my fault. Certainly embarrassed and not proud.
I didn't think it through when I put the balancer back on. A few high speed engine revs proved how poorly I had done.
D.
PaGlenn
Well-known Member
- Location
- New Milford Penna
Ran over a small stump with the push mower. There goes the crankshaft.
lee little
Member
I had a crank break in a 1520 John Deere while the tractor was idiling while I was opening a gate!
BOUGHT PA-IN-LAW 66 327 EL CAMINO...RAN, BUT RATTLED..PULLED, SHAFT BROKE @ REAR OF 1ST JOURNAL...DOGKNOT TURNED HER ENOUGH TO RUN...FOUND PITS DEEP AS YORE NAILS, ON JOURNALS...FRESH REBUILD...REALLY??
FLEW STOCK 220 CONTINENTAL PT-17 STEARMAN, ILL TO LUBBOCK, TX...MONTH LATER, PROP & NOSECASE DEPARTED, ON OTHER PILOTS...U THINK THATS SIMPLE, WILL FALL DOWN TO GROUND...NOT ALWAYS, ONE MY WIFE HAD FLOWN @ SAN ANTONE LOST PROP, IT CLIMBED @ CUT TOP WING OFF, THE END...HOPE U LIKE WAR STORIES...BE BLESSED, GRATEFUL, PREPARED...
FLEW STOCK 220 CONTINENTAL PT-17 STEARMAN, ILL TO LUBBOCK, TX...MONTH LATER, PROP & NOSECASE DEPARTED, ON OTHER PILOTS...U THINK THATS SIMPLE, WILL FALL DOWN TO GROUND...NOT ALWAYS, ONE MY WIFE HAD FLOWN @ SAN ANTONE LOST PROP, IT CLIMBED @ CUT TOP WING OFF, THE END...HOPE U LIKE WAR STORIES...BE BLESSED, GRATEFUL, PREPARED...
Kent Petersen
Well-known Member
I had a crank brake on a JD5020. I had overhauled it. it had a rod knocking at that time, crank was 040 out of round Hot shop machine op talked owner into welding very much against may opinion. I said no warrant on the crank. IT came back with just 1300 hours crank was broke that came out to a little over $3000.00 to fix it right
Goose
Well-known Member
I sent a crankshaft from a 454 Chevy pickup engine to be reground. It was shipped back by truck-laying down. I put it in the block and, "Yup" it was bent. I had to sent it back.
There's a reason you should ALWAYS transport a crankshaft standing on end. As sturdy as they seem, when they're laying down it doesn't take much of a bounce to damage them .
There's a reason you should ALWAYS transport a crankshaft standing on end. As sturdy as they seem, when they're laying down it doesn't take much of a bounce to damage them .
fixerupper
Well-known Member
Neighbor's 7080 Allis. He lent it to another neighbor. If I remember right while the other neighbor was using it, it threw a fan belt because the balancer was coming apart. The neighbor he lent it to put the fan belt back on and kept running it. Belt threw again and he put it back on again, then the crank broke.
I too bent a crankshaft on a lawn mower when I hit a stump.
I too bent a crankshaft on a lawn mower when I hit a stump.
Janicholson
Well-known Member
Sometimes when things fail the forensic process is unable to assess what broke first. Yes I have. Jim
J.Wondergem
Well-known Member
- Location
- Rockford, Mi.
My Dad broke a crank on a Oliver 66 diesel in 1955. It broke in between the throws, still ran, but shook bad.
I have replaced several broken diesel cranks for others. David Brown 1200, JD 310, Case 870, Moline M5. All but the M5 would still run but didn't sound very good. I have an MM 605 power unit that the crank is broken but was that way when I bought it. Also have seen some bent cranks in push type lawn mowers from the operator hitting things like 4x4 blocks of wood, bricks & iron wheel weights.
tomstractorsandtoys
Well-known Member
I bought a Deere 2510 years ago that the seller said had a balancer shaft bushing bad. He had the Deere dealer out and that is what they said. Tractor had a bad knock but ran good enough to load onto my trailer. When we tore it apart to fix the crankshaft was in two pieces. Overhauled a 4020 many years ago and reused the rod bolts(will not do that again). Owner was driving it down a big hill with an empty wagon and the bolt broke. He shut it off right away. When we tore it down the crankshaft was bent. We sent it to s shop that put the entire crankshaft in a forge and straitened it up. Tractor is still running good and that was thirty years ago. Tom
crankshafts usually break for a reason, wrong injector in 820 john deere, welded cranks , cranks that have had a bearing burn up on,bad harmonic balancers, out of balance ect.but sometimes they just break after a long service life.
I wont weld on a crank or even grind a crank if a bearing has spun on it anymore. but I have in the past
One was a 396 chevy I built the engine for a freind in 1985 knowing the rod journal had been welded but also it had been run for several years prior.
The engine made a funny sound shortly after being fired up. front journal broke. I flipped engine upside down pulled crank out and discover piston had been hit, but it was the one piston that could be pulled from the bottom . I made special ring compressor to put rings and piston back in from the bottom. That engine is still running strong today.
most of the others not so good of results when crankshaft broke.Paul
I wont weld on a crank or even grind a crank if a bearing has spun on it anymore. but I have in the past
One was a 396 chevy I built the engine for a freind in 1985 knowing the rod journal had been welded but also it had been run for several years prior.
The engine made a funny sound shortly after being fired up. front journal broke. I flipped engine upside down pulled crank out and discover piston had been hit, but it was the one piston that could be pulled from the bottom . I made special ring compressor to put rings and piston back in from the bottom. That engine is still running strong today.
most of the others not so good of results when crankshaft broke.Paul
1.) IH 503, combine, C282 engine, night time, hired man flagged me down, said it started to shake something awful, he had pulled the threshing clutch and idled it down just before I got there. Grabbed flashlight and noted smoke was billowing from engine area. Ran up ladder, and shut it off. Engine had thrown #5 rod and broken a hole in both sides of the block, but somehow hadn't yet locked up.
The next morning, we dumped in a gallon of used oil and started it long enough to raise the platform to tow it home.
2.) 1982 Chevy C-10 6.2 diesel pickup I bought new, 125,000 miles, was driving home, heard an odd rattle or two like they sometimes do when an injector gets sticky. Got home, popped the hood, it was idling quietly, grabbed the throttle lever on the IP and revved it up a bit (they are overspeed governed, you can't over rev them), CRUNCH, I was standing at the left front, and it spit 3 chunks of wristpin, a chunk of rod, part of the piston from #3, and pieces of the side of the block (and oil and coolant) at my feet.
Thought is broken wristpin started that fiasco.
3.) At least 3 GM 6.2 diesels belonging to customers that broke the crankshaft near the front at such an angle that they still ran (and POUNDED).
4.) A customer's '89 Chevy pkup 5.7, front main bolts worked loose, crank broke in front counterweight, still ran.
And several handfuls more!
The next morning, we dumped in a gallon of used oil and started it long enough to raise the platform to tow it home.
2.) 1982 Chevy C-10 6.2 diesel pickup I bought new, 125,000 miles, was driving home, heard an odd rattle or two like they sometimes do when an injector gets sticky. Got home, popped the hood, it was idling quietly, grabbed the throttle lever on the IP and revved it up a bit (they are overspeed governed, you can't over rev them), CRUNCH, I was standing at the left front, and it spit 3 chunks of wristpin, a chunk of rod, part of the piston from #3, and pieces of the side of the block (and oil and coolant) at my feet.
Thought is broken wristpin started that fiasco.
3.) At least 3 GM 6.2 diesels belonging to customers that broke the crankshaft near the front at such an angle that they still ran (and POUNDED).
4.) A customer's '89 Chevy pkup 5.7, front main bolts worked loose, crank broke in front counterweight, still ran.
And several handfuls more!
I didn't do it but was in cummins Reno Nv when a guy brought a rear engine cement truck in making a hell of a noise. service manager came out guy said he figured he would drive it in it couldn't do anymore damage. there was a hole in both sides of the N14 block as big as a basket ball you could look right into the engine while it was running and see the guy on the other side of the truck.
shaun wallace
Well-known Member
Broke one in 292 ford 2/5 crank throw. knocked but drove home. Replaced couple in early 172 diesel Fords and a David Brown.
I was running a WD45 that was recently overhauled when it developed a mysterious intermittent noise when I'd throttle down to turn at the ends. I mentioned it several times, but they thought I was nuts. After a week or so, it suddenly turned into a horrible knock and I shut it down. The crankshaft had broken completely in two in one of the main journals. The two brother owners worked all night on it, and I was disking with it again the next morning. Good memories of a good old tractor.
ptfarmer
Well-known Member
- Location
- San Antonio, Tx
I bought a tractor that wasn't running, got it home, and running. Had a bad knock, and hardly any oil pressure. Whoever reground the crankshaft didn't put the radius on the journals.
Many years ago, gas engine on a Gleamer F, it ran rough a little bit, the. Stopped on a revolution or two. Only noise left was the rest of the combine thrashing bits gliding to a stop. Mechanic figured a main nearing spun and cut off oil flow to 3 of the cylinders. A rod broke and whacked around to where it shattered the camshaft into short chunks. Lots of internal parts were in the bottom of the oil pan, was a hole in the oil pan too. The broken rod even hit an internal oil passage, making the block worthless to rebuild.
Thrn almost exactly a year ago, he TW20 engine died loudly and badly with 1 acre of chisel plowing left. Broke the crankshaft, mechanic only said it do so harshly, didn't really dig into it felt a good used block would be best option.
Paul
Thrn almost exactly a year ago, he TW20 engine died loudly and badly with 1 acre of chisel plowing left. Broke the crankshaft, mechanic only said it do so harshly, didn't really dig into it felt a good used block would be best option.
Paul
Phil9N3667
Well-known Member
Never had/bent one, but had one to get ground wrong! Had one ground .020" for a 424 IH and somehow the #3 main journal was wasn't parallel with the other four. Took it back to the machine shop with the block and a dial indicator. Showed them what I had going on and they fixed it by going to ,040" on the mains. Not the ideal solution, but a 424 IH isn't exactly a high stress engine!
Seen a couple broke and still running, one ran three weeks until he drove it to the bone yard. My favorite is my buddy who hydro-locked his Bronco. 4,000-5,000 RPM to zero RPM's in the distance of one stroke! I really wanted to get that bent connecting rod out to have as a conversation piece but wouldn't you know it, it was wedged in there pretty tight. Crank didn't break but I bet it was a little twisty. JD
The 180 AC puller loves to bend or break crankshafts but at 6500 rpms I guess its to be expected...
It has billet main caps and a crank girdle..The only cranks I have ever broke or bent were
in pulling tractors..
The Wards ER puller at the bottom also went thru several crankshafts....The 265 Chrysler turned
6000 rpms so you knew it was bound to happen.
It has billet main caps and a crank girdle..The only cranks I have ever broke or bent were
in pulling tractors..
The Wards ER puller at the bottom also went thru several crankshafts....The 265 Chrysler turned
6000 rpms so you knew it was bound to happen.
Have never broken or bent a crank myself..however I have replaced cranks(or engines) with broken cranks in Allis L2..Allis 7080...JD 4650...JD 7520...JD 8440...Massey 1155
As far as it goes...replacing harmonic balancers at four or five thousand hours is a good idea...at least replace them if they are wobbly!
MARK ROBKE
Well-known Member
I have seen 2, 1 in an old 350 Cummins,and the other in my Dad's 340u tractor.His broke when plowing a garden for someone.Both engines still rotated.Mark
2002sliverado
Member
It happened in our (1970 model year) 1955 Oliver. Snapped right down the middle. I was not running it. My uncle was. Let's just say that tractor was less than dependable in the 3 years it was on the farm.
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