Q:i have a longboard skateboard and also a pair of hockey rollerblades and i just bought 2 8-packs of bones swiss ceramic bearings and i was wondering if i needed all of them just for my rollerblades or will there be enough for both the board and the blades.

on the splendid rollerblade there would desire to be a brake if no longer i think of is replaceable.in case you go with for to end (with the brake) in simple terms pull up the heel (with brake on it). If there isnt than sure you additionally could make very almost a turn to end. P.S- I been rollerblading for 8 yrs- 3 year playing curler hockey- 2d year substitute from skater to goalie.

Q:what are moter bearings and how hard are they to put into a gas engine?

There are different kinds of bearings in the engine, including main and rod bearings. Depending on which you need to change, it can be difficult or relatively simple. Main bearings are the easiest to change, you can access them by removing the oil pan. Take off each main cap and you'll be able to remove the upper and lower half of each bearing. Make sure to clean and inspect the surfaces for damage, and clean them really well. Lubricate the inner surfaces of the bearings after installing them with assembly lube. Be sure to torque the caps back on to the right spec. Hope this helps!

Q:in a bmx bike and how can you know that it is sealed or unsealed?

sealed bearings are encased and unsealed are caged or loose ball bearings. if you can see the actual ballbearings they arent seal. if they are enclosed they are sealed.

Q:Is McCain losing his bearings?

I have heard McCain called a loose cannon and if you imagine an unsecured cannon rolling around a ship's deck on a rough ocean, I have to admit it does evoke McCain. You never know who mcCain will take a shot at. It is a little disturbing frankly as i do think he is a good guy.

Q:So i have a longboard and the bearing it came with died on me. Changing my bearings for the first time, i had no idea what i was doing until i look to youtube. I did as they said but something fell out. It was my speed ring. So i changed themas i was told and i put the ring back on before the bolt. I dont know what i did but now it spins very fast but slows down IMMENSLY within 10 seconds of a spin test and stops abruptly. What happened? (note: i skated in the rain... Stupid me)

Well if they are newer bearings you need to break them in what can take awhile depending on how much you skate... it can take a good day to a month or so just break them in and get them going... and from what I read online never use WD40 on them

Q:What is the needle roller bearing model with outer diameter 21 and inner diameter 16?

Needle bearing roller bearings are cylindrical roller, relative to its diameter, the roller is thin and long, hence the name. Although the needle roller bearings with a smaller section, the load bearing capacity of the bearing is still high, with thin and long needle bearing roller (roller diameter of D = 5mm, L/D = 2.5, L roller length), so the radial structure is compact, its diameter and load capacity and other types of bearings at the same time, minimum diameter, especially for the supporting structure of radial installation size limited.

Q:how can loose fits cause failure in bearings? and in particular affect the outer diameter?i am seeing a failure catalog for bearings, and i read : discolartion and scoring is the result of the outer ring slipping in the housing. why outer ring?

Bearings are matched to shafts and housings to a tolerance of .01mm (ideally). This fit permits creep to distribute wear over time, while providing uniform and stable support for the inner and outer races. Tighter (interference) fits are destructive. Loose fits, which permit chatter and impact, are equally destructive. If you are involved in maintenance you will get your money's worth from the attached link.

Q:Ok, jeep is at the dealership due to low oil pressure when hot. First thing I did was verify the low readings with a mechanical gauge. The dash readings are accurate. less than 5 psi at idle and 15-20 while driving. Dealership is currently diagnosing the problem and have tried a new oil pump which did not work, inspected the bearings which they said were fine, changed the gauge cluster to see if that was the culprit (of course not because I checked the readings with a mech gauge, but whatever) and changed the sending unit.. what else could this possibly be??

A four stroke engine such as yours has pressure lubrication. The oil pump picks up oil from the sump, sends it through the filter, and than to the engine. Pressure depends on fluid pushed through a restriction. Do NOT drive your vehicle with low oil pressure, or you will do permanent damage if you were planning on a rebuild. Even if you use the incorrect oil weight, 5psi at idle and 15-20psi while driving has nothing to do with it. Oil is not getting pressurzed because of either the oil pump, oil pump pressure-relief malfunction, oil leaks at main bearings, connecting rod bearings, etc... If they changed the pump and gauge and you verified with a mechanical gauge that you have insufficient oil pressure, the engine has to be disassembled and inspected. Bearing gaps have to be measured with micrometers, calipers, plastigauge etc. I doubt that the dealership will perform this. If you're under warranty, perhaps you will get a new engine. If not, don't worry. I assume you have the 4.0L I6 which is very common. I was planning a rebuild once but found out that long-block engines can be had at wreckers for about $800 with super low mileage. Good Luck.

Q:This is a mid-1970's Schwinn. Obviously, if there is grit or dirt or rust I will clean them. My instinct is to use 3 in 1 oil if I must, then repack everything in good old reliable bicycle grease. But if there is just old grease without anything gritty, do I even need to clean the bearings etc., and if so, what cleaning agent do I use?

any other like item such as Park polylube 1000 is fine too. Dont use 3 in 1 oil it is too viscous and will break down as a lube in bearings .

Q:I would have guessed ball bearings, but a brown liquid just poured out of the shaft and it looks like oil and smells burned. I'm sure it's not a good thing either way -- any ideas what it is?

Yep, anything with ball bearings has to have some sort of lubrication (usually bearing grease or maybe gear oil). Without the lubrication, heat would build up due to increased friction and the metal in the bearings (and gears) would crack and eventually fragment, causing total failure in the system.