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got a min
Active Member
31 Posts |
 Posted - 10/23/2010 : 06:53:40 AM
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Watched a fellow mechanic remove kingpins.He heated them up cherry red and then dumped water on them.pins almost fell out.It worked well but made me a little concerned about the axle.Has anybody else tried this??? |
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Katomech
New Member
3 Posts |
Posted - 10/23/2010 : 3:04:41 PM
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| Never heard of that way? |
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Harrison Fire
Senior Member
United States
175 Posts |
Posted - 10/24/2010 : 05:27:21 AM
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http://mcveighstrucksprings.com/
I like their kingpin press.
Wander, herd or hook your bus there.
Drive it home, straight and true,
HF |
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bwest
Administrator
United States
3820 Posts |
Posted - 10/25/2010 : 10:23:25 AM
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Most of my king pins will drive out. If I have to I will heat one up but never cherry red and I will definatly not pour any water on one. This will, repeat- WILL!!, change the structure of the metal. Now, will it break? Maybe, maybe not. You'll have to wait till the axle is put in some kind of stress. That stress might be a pot hole or an accident. Either case you can cause an accident or make one worse. On a school bus think investigaion. FEDS!!, DOT!!, Let me see your records. What was your proceedure when you changed that king pin? Was anyone watching that can back you up when you did that king pin? This is the reason I am very carefull when doing anything on a school bus.
How many years till my retirement? I pray I can make it before something happens to one of my units. Is there some other ocupation I need to be doing?
Better yet I think I will look into getting a press. What about you? Seams like a waste of money no more pins than I do but if it saves a life.... |
Bryan |
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got a min
Active Member
31 Posts |
Posted - 10/25/2010 : 3:23:10 PM
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| I feel the same way.I like to sleep at night.thanks for your apinion. |
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BJ Henderson
Advanced Member
USA
280 Posts |
Posted - 10/25/2010 : 6:44:58 PM
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| The king pins yes. The axle itself, no. If you heat the kingpin, you are going to replace it anyway, just do not heat the axle. When you pour water on the kingpin to shrink it it doesn't hurt anything. It is not recommended that you ever heat or bend the axle. |
CMTT,CMAT,CMBT |
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Fastback
Top Member
1500 Posts |
Posted - 10/26/2010 : 05:20:12 AM
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| I either drive the kingpins out with my air hammer or remove entire axle and take it to machine shop. Chances are they are going to get the knucles anyway for the bushings and fitting pins. Don't do enough of them to justify a press, don't have enough room in shop for another large piece of seldom used equipment. |
Why yes, the ORIGinal CHARGER is a Fastback |
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Wolf0r
Top Member
USA
2181 Posts |
Posted - 10/26/2010 : 06:27:50 AM
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| I have a Snap-On king pin press for sale. I used to change kingpins in the older GM chassis with-out bearings. It will do Ford trucks also. If interested e-mail me. Rob |
“The good thing about science is that it's true whether or not you believe in it.”
Neil deGrasse Tyson |
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IBTMech
Top Member
USA
973 Posts |
Posted - 10/26/2010 : 3:00:26 PM
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It is safe to warm, and I stress WARM, the axle to 400F without affecting the axle. Anything more will make it brittle. Check it with an infrared temp sensor. If you can't, remove the axle and take it to a shop that's equipped to press it out.
I have a 25 ton press here and on some of these salt trucks, even that's not enough. I know a guy with a 100 ton press they call 'Brutus'. That press will even shear off the drawkeys. |
If it doesn't fit, FORCE it.
If it breaks, well, it needed replacing anyway.
Pullin' wrenches for 45 years. |
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Wolf0r
Top Member
USA
2181 Posts |
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raytobe
Advanced Member
USA
293 Posts |
Posted - 10/27/2010 : 4:47:59 PM
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I asked this question a couple of years ago on this forum (except the water part--never heard of that). I'm an old timer and have done over a hundred, maybe two hundred, kingpin jobs by heating the axle as hot as I could get it and then driving the pin out using an old kingpin (with much effort in a lot of cases).
I've never had a axle fail by doing this. I've never SEEN an axle fail by doing this. I've never HEARD of an axle failing by doing this. This was done on busses that I worked on for their entire in-service life.
We tried an on-axle press that the shop bought but the thing just leaned over and wouldn't budge the pin.
I consider myself lucky as common sense would tell you that the heat would weaken the axle.
Been 15 years since I've had to change one. They last longer now for some reason. |
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kingpin
