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Rev. Dr. Moses P. Lester posted:big bore ktm 2 stroke dirt bike i bought. 440? How long did that thing sit like that to let the sleeve rust that bad? I'll put up a few of my own. 01 YZ250 I'm working on. Clean break.  Click here for the full 1095x821 image. Not mine: All this poor thing wanted was transfer ports.    YZ250F crank that was not too happy with life:  Click here for the full 1600x1200 image.
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Oct 31, 2009 17:38
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hippynerd posted:How does this happen? No torque plate was used while finishing the cylinder, so the cylinder was not put under proper stresses, and cause minute undulations in the cylinder wall. This is my understanding, someone correct me if I am wrong.
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Nov 8, 2009 20:45
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I should have said more when I posted. I have also seen that predominantly in 2-stroke engines, as a result of the lack of a torque plate when boring / honing. As there was no plate, the material was able to "slouch" and bulge slightly, mainly around the head bolts. Like was said, when it overheats, that is the first thing (the bulged spots) to contact the piston when the film of oil is broken.
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Nov 9, 2009 02:50
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thArf posted:now thats some shear failure If that was an accident, did the driver / passengers survive?
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Nov 15, 2009 19:17
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Damnit... still not being able to see half of the pictures posted.
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Dec 12, 2009 03:05
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The thought of a boiler exploding terrifies the hell out of me.
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Feb 1, 2010 01:38
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subaccord04 posted:http://www.youtube.com/watch?v=WmkHTkmj2_U The Fubar videos were great. Showing how stupidity prevails. After watching a handful of random videos, I have learned a decent amount about diesels themselves, and the entire PowerStroke line.
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Feb 7, 2010 04:56
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It looks like those had been run for a good while. Nothing is broken off, and it doesn't look like the ground was crushed flat, just bent a bit. Besides some damaged plugs that grounded out, I don't see too much of a problem. Perhaps if the rod bearings let go so bad the pistons smacked the plugs?
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Mar 1, 2011 06:08
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Chuck some new seats, valves and a piston at it and hone the poo poo out of the cylinder and you will be good to go! Seriously, newer 4strokes are like riding a hand grenade with the pin pulled. No time like the present to get a worked over head, big bore kit, Ti valves and springs and some cams.
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Mar 2, 2011 09:14
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MEK?
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Mar 28, 2011 09:23
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Devyl posted:God drat. 250F or 450F? EDIT: 5 valve - Yamaha.
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May 3, 2011 05:40
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"It sounds different than normal when you are trying to start it" No poo poo?  
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Jul 19, 2011 00:59
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tater_salad posted:Hmm seems a bit out of adjustment. BRP Rotax engine from an ATV. 150cc. Skipped a few teeth on the timing chain.
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Jul 19, 2011 02:33
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I just encountered death wobble on my lifted 98 Grand Cherokee for the first time last week while on the highway. I was going around a slight bend and it just started out of nowhere. Scary as gently caress. It didn't wonder around, or try to get out of control, just everything started shaking like mad and I could not steer at all. After taking a moment to change my pants, I got a friend to take a look underneath while I was racking the steering over. The output shaft the pitman arm resides on - from the steering box - was moving up and down in the steering box about 3/4 of an inch. Time for a new box.
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Jul 27, 2011 07:59
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From a friends FaceBook page: edit: From a Grand Cherokee. Mine will probably do this sooner or later.
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Sep 25, 2011 19:39
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Where the hell do you get an NP242 for $75?! They go for over 200 here all day long!
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Oct 6, 2011 03:00
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What kind of rpm would that driveshaft have been spinning at when it let go ?
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Dec 19, 2011 20:18
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Turbocharging your completely stock snowmobile? Oops... 
DefaultPeanut fucked around with this message at 01:40 on Jan 19, 2012 |
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Jan 19, 2012 01:37
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kastein posted:I know it wasn't enough to kill it, but I'd rather play it safe, no sense wasting a good 4.0 block, especially when I'm pulling it at some point in the near future anyways. In a friends Grand with a 5.2 we hit a deeper than expected puddle at 80km and hydrolocked it at 2500+ rpm. This was at 3 am and no one was anywhere close. We waited for the water to bleed past rings / valves / valve seals and crank it every 20 minutes. Nothing to pull the plugs with in the bush, whoops. Started after 2 hours of crank - wait, crank - wait. 14K km later and it's still running fine! Also, before you drop in your donor 5.2, do the intake plenum fix while the engine is on the stand / ground.
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Mar 20, 2012 07:30
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What the hell is that thing hanging? A Condenser?
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Jun 12, 2012 02:02
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lazer_chicken posted:Don't see many camshaft failures on ohc engines these days. Start looking at KTMs.
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Jun 21, 2012 07:41
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You live on the North side of the Fraser, don't you?
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Aug 27, 2012 11:15
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Clunk clunk clunk clunk
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Sep 13, 2012 00:39
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From a Jeep forum I lurk at: Apparently a fairly new cam just snapped in two. No signs of oil starvation or galling on the bearing surfaces. Casting flaw?
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Sep 30, 2012 08:56
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It came out of a Chevy 327 swapped into a YJ. Apparently the missing lobes dropped down and got chewed on by the crank. Broke a counterweight, piston skirt and holed the oil pan.
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Oct 1, 2012 20:01
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Sockington posted:1/2" drive torque wrenches only go down to ~20-30lb-ft. Got your drive sizes mixed up a bit? My 1/4" Snapon torque wrench does 0-200 in-lbs, 3/8" does 15-100 ft-lbs and the 1/2" does 50-250 ft-lbs. On the note of aluminum parts needing exact torque, I have seen many cam seizures in four stroke MX engines because the owner didn't heed the graduated torquing sequence to 86 in-lbs.
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Oct 29, 2012 19:30
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B4Ctom1 posted:My 3/8" unit is identical to your 1/4", but snapon made it with a 3/8" socket piece sticking out of the head where your 1/4" one is. It looks funny. Why... Why the need for a 3/8" drive with that low of a torque setting? What could you need to torque under 200 in lbs where a 1/4" drive socket set would not be big enough? The 1/4" tq wrench in your picture is way too nice and new. Mine is old. Old enough to be made in  by SnapOn
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Oct 30, 2012 23:16
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I hear ya. That would make it pretty drat convenient swapping between teardown and build not needing to have two drive sets kicking about. On a side note about transmissions, what do you know about the 4L30e?
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Oct 31, 2012 17:23
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EightBit posted:I don't think threadlock is quite good enough for an aquatic jet engine that is going to spin at ridiculous speeds. Fun fact, the shop that is in most of his videos is owned by my father in law. Stainless lockwire - good for heat cycles and vibrations. Wouldn't want to swallow one of those at high rpm.
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Feb 12, 2013 03:22
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Few things from around the yard. Sorry for the crappy pictures from my phone. Hitatchi 350 excavator. Isuzu 7.8L diesel  Volvo A30D brake disk. How does is even crack like that? Long run down a hill with the brakes on, and hit cold water?  D9L V-12.  Someone thought half a bottle of ether was a good idea. You could honestly stick your arm in one side of the block out the other.    A30D turbo failure  
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Feb 19, 2013 04:00
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InterceptorV8 posted:But they also don't drive fast. Loaded rock trucks hum along pretty good 40k. We kept the tires around 70 psi for the Volvos 30's we run, bigger machines with heavier loads run them upwards of 110 psi. When we had to run them to another site a few km down paved roads, we set them for 85 psi and were able to keep them fairly stable at 70km/h.
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Feb 22, 2013 02:06
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Do I win some sort of prize or a plague of broken extractors to come?
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Jul 19, 2013 06:18
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SiB posted:God drat. Journeyman here make $35-40 flat rate with bonuses up to $45/hr. Free healthcare and benefits. Government will even pay you to be an immigrant! We can't find enough techs here..... Any of you want to move to Canada?! 200 flat rate hours per month is not unusual that's for sure. Where the hell are you in Canada? I'm in BC, and the techs at our shop (Motorcycle, ATV, UTV) are at $35 an hour, no benefits or even coffee breaks! I'm a 3rd/4th year apprentice by hours, not schooling and I get $20 hourly.
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Aug 3, 2013 06:37
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Aug 31, 2013 06:39
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Used Sunlight sales posted:I've blown up enough two strokes to know that I'm looking at a CR125. No clue to be honest. It showed up in a box with an RO saying: Cust said engine made strange noise, estimate damage. obso posted:I don't see any heat discoloration on the crank so I'm guessing the latter. (And I think it's from a YZ125) ~2001 CR125
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Sep 3, 2013 00:48
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`Nemesis posted:2013 Cadillac ATS heater core replacement: Warranty flat rate time ?
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Nov 30, 2013 04:42
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Horrible engineering failure? The entire building has settled around that hump which used to be the footings for an old highway overpass. Could this have been dealt with before constructing the site ~4 years ago? 
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Dec 19, 2013 10:28
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That area is going to be turned into a public clothing / accessories area after it has been fixed, whatever that entails. The dis concerning thing, the new overpass was built about 200 feet from the door you can see through. Whenever a tractor-trailer goes past, or even a large cube van, you can feel the ground quiver, you get bounced by a cemi.
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Dec 19, 2013 17:51
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Could you have hosed it down after it had cooled to help keep corrosion from occuring?
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Jan 6, 2014 08:35
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Jan 26, 2014 05:40
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