The bolt loosen's counter clockwise. Dynamic or alternating loads from machinery, generators, wind turbines, etc., can cause mechanical shock - a sudden force applied to the bolt or the joint - causing the bolt threads to slip relative to the threads of the joint. If you never want a issue again, buy a Shimano M440 crankset (or something similar) and possibily a new bb (if the bb you have is the right length you'll be 'ok'). Use a torque wrench if possible. Crank bolt keep coming loose - EMTB Forums 5. In order of installation: The pre-load cap The pinch bolts (should be tightened and torqued by alternating back and forth). 07-01-2012, 03:43 PM . Left crank arm worked itself loose on the ride home, was fine this morning. Alan; Jan 20, 2007; UK and Europe; 2. Still pleased with the bike. (11-10-2020, 10:31 PM)ryerye Wrote: I bought my 15 year old a Schwinn Ider Mountain Bike. You can tighten that bolt and everything feels fine until you start riding and putting pressure on the arm and it wiggles it's way lose again. Make sure the cranks are on the spindle evenly and are on the spindle enough but also not sticking out to where tightening them doesn't do anything. Loose Crank Ootini 1 Apr 2014 1 2 Next Ootini Senior Member Location North Wales 1 Apr 2014 #1 Hi, The NDS crank arm on my Ridley XBow keeps coming loose. You tighten by turning the nut clockwise, which means that this left-side crank arm nut is self-loosening. Hi, the crank bolt will not come loose unless there is movement between the crank and bottom bracket axle. 5. Let's find out the reason why the crank arm keeps coming loose along with their solutions- Issue 1: Arm Is Wired Out You can start checking if the left crank arm is wired out or not. Anyway took it to Halford and the guys was very quick to spot that a bolt had come loose, from the crank chain ring. Any help with the follow is greatly appreciated. Answer (1 of 6): If it's properly tightened, it shouldn't come loose. Not to the point that it's falling off, but it wiggles after about an hour or so riding and needs tightening up. and the cotter pin is way below the actual bolt and serves no **** purpose but to keep it from coming off.. What I did in the mean time is put 2 washers under the nut so it actually catches the cotter pin. . 2 Next, install the adapter while referring to the illustrations below. #3. The crank is steel and shouldn't deform at all. If this doesn't work - the crank loosens after a short period of time, or the bolt is missing - there are more drastic measures. Repeat process with the left crank arm (C). I notice the pedals start to wobble and when I get home I torque it down to 450 in/lbs per FSA's installation guide. Jul 10, 2018. . $4.50 ($2.25/Count) In Stock. blue Loctite, but in a pinch any kind of glue works) on the threads. You will need an Allen Wrench or a Smart Wrench for this repair. Tighten the bolts to the manufacturer recommended torque. Despite this in about 60-100 miles it . Maybe the two square tapers are not a good match or maybe it is just not tight enough. Re: Profile crank bolts keep coming loose. The lock plate (stopper pin?) $20-50 range I think, from what I've seen here. During usage, crank arms and bolts holding them in place can become loose during a hit on the rocks or something else on a trail. Thus, the bolt gets loose, and this keeps going in a loop. Posted: Jul 3, 2009 at 21:46. I'll bet that is the problem, even though it felt tight on install, it wasn't really tight enough. Step 2 Position a cotter pin press over the crank with the bolt attached to the press against the threaded end of the cotter bolt. I'll tighten them down while it's idling, get it nice and quiet, drive around the block and it's barely running because the arms are so loose the valves won't close. so far so good. Usually if your cranks get ridden enough while loose, sq. Surprised it's not an interference fit (the crank arm), it comes right off. If you've been repeatedly riding with a loose crank arm it could be that it's now damaged. Grab the drive side pedal with your left hand and the allen key with your right hand. Job done. Bike isnt to old probably around 250 miles on it. I've tried tighening it etc and nothing will work.. Step By Step Process: First, remove the old crank arm by unscrewing the retaining bolt with an Allen wrench. Pedals are threaded so the action of pedalling tightens rather than loosens the bolt (that's why they're opposite-threaded to each other). Barchettaman. You could try to make a thread again. Remove the crank bolts, lubricate the threads and under the bolt head, and reinstall. A fresh lockwasher on the crankbolt first will NEVER work. Please subscribe http://www.youtube.com/channel/UCQ6GEz0mqb9GuzKtMl4h1dA?sub_confirmation=1 Bicycle crankset bolts coming loose, crank arm falling off?T. Maybe I'm crazy but it depends which is driving which. Next, take your new crank arm and insert it into the crank arm socket. Either . Pull the left caged bearing out of the cup using a seal pick or small screwdriver. It seems like a design issue, and I'm not sure how to fix it. However, both occurred (it was off the axle a bit and the bolts were a little loose), yet I can't be totally sure now which came first. If you've fitted a new bolt and torqued it up properly and it still comes loose, it's most likely that the spline on the crank and / or axle are worn. Technically, there are three things that should help prevent the thing from falling off. UK and Europe Feb 1, 2007. Every time my brake light and charing light comes on. Quote. Complicating matters further, there are several types of crank arm fixings out there. This item: WIROJ Hex Head Crank Arm Bolts 8mm x 15mm, Pack of 2. Trek 4300 problem: Crank bolt keeps coming loose. Remove adjusting cone clockwise using an HCW-18 or pin spanner. . 1 ensure the the drive side crankarm is seated fully into the bottom bracket 2 fit the crank to the spindle ensuring the safety tab locates in the small hole for it on the spindle. I thought I'd wrecked the crank. Left crank coming loose - Cycling UK Forum 4. Be sure to hold onto the end of the crank arm as you remove the bolt, as it may come off with the unscrewing force. Loose bolt on left crank arm. I have to stop and tighten it. Built a new bike a few weeks ago and the Full Speed Ahead SL-K Compact MegaExo keeps coming loose. A. P. Loose pedal destroys crank arm. The first time it happened it had come off the axle about 1.5mm, and the bolts were noticeably loose. ago. The most likely cause for the loose rocker arm bolts in your engine is either inadequate tightening originally, or an effort to adjust the rocker arms at some point in the engine's life. If the bolt that holds the carrier in place is free spinning the carrier is pulling forward..causing the chain to come loose..replace the 4 bolts and the backer plates that hold the carrier in place and torque to specified specs.. M. You could try tightening with lots of torque, grease on the square taper and threadlocker (e.g. Cottered Cranks Step 1 Remove the nuts from the cotter bolts that thread through the crank with an adjustable wrench. It's the crank arm rocking that works the bolt loose, not the bolt letting the crank arm move. I tried some blue thread lock but I don't think I got the . Allow to dry. Shimano SLX would be your best option - the BB will last longer and the crank will never give trouble. #1 Anyone else's right crank arm bolt keep coming loose? However, in most cases, it's the threading in the crank arm that gets damaged. If it's just a loose bolt, you can simply tighten it. rich c. Well-Known Member. Bikes: 15. The bike's only a month or so old with just over 100 miles on it. Torque on crank bolts is between 25 to 30 ft/lbs depending on the manufacturer. Loosen and remove locknut and keyed washer underneath. Left crank arm keeps coming loose Another problem with the bike. Please support my channel so I can make more great videos - https://www.patreon.com/roadsidecycles :)In this video i'm showing some things you can try to re. You could try tightening with lots of torque, grease on the square taper and threadlocker (e.g. A little grease on the taper, and on the pedals when you thread them in helps. SRAM has the torque specs on their site. For 8 spline cranks you can usually see through the pinch bolts' slit where they are. Oct 7, 2009. Clean the inside thread of the BB with acetone on a Q-tip, the crank arm bolt with acetone on a bit of rag, to remove any old threadlock. . One common problem is that the crank arms can become loose over time. I have tried changing the bolt & it just still keeps coming loose & if it goes tight the piece of plastic thats like a washer on the bolt doesn't sit properly. 2. It could be due to vibration, incorrect tightening, dirt in the threads, damage or a com. light fx, coolant & oil temp . Left crank keeps coming loose 2. I don't have a link, but some unicycle arms and tandem arms are the right configuration, I guess. 7. The bolts are made of rigid steel, where the crank is made of soft aluminum. The bolts will have backed out over 1/8 of an inch. 9 mo. whats the best way to keep these dam things from coming loose, I can't seem to find a locknut. Replies 38 Views 778. . Sold by SmartLiving365 and ships from Amazon Fulfillment. -if your crank is developing the "profile wobble", check and see if when the bolts are tight, if the crank arm can be moved up & down on the spindle slightly (not side to side), this indicates that your splines are wearing out & is why it keeps coming loose-if your threads in the spindle and the bolt are still good and not stripped Park Tool's Crank Bolt Wrench - CCW-5C is designed for wrenching on older bikes with 3-piece cranksets. its not sure your cranks are dead yet but if you continue to ride them with the same bb you will most probably end up ruining them both, try and find out whats the culprit, the bb or the cranks or maybe theyre not working together. Note: The. Depends on the riding style and rider weight. But if there going to be a fault ill get it. This was rubbing on the guard . Another problem that can occur is bent crank arms. Namely, the bolts holding the rocker arms down keep coming loose. Since there is a crank bolt there that prevents it from coming off, it walks upwards - in other words tighten itself. Loosen the pedals by turning the right pedal counterclockwise and the . Non drive side crank arm keeps coming loose : bikewrench 3. When pedaling forward, the motion is counter-clockwise, and the . The crank arm will not remove with bearing in place. . . If your bike has spindle bottom brackets, there might be a chance that the spindle will become wired out and the arm will become loose. When the crank loosens the arm rocks back and forth slightly rounding out that square. Shock. Unfortunately your crank arm is ruined. Crank bolts, as the name suggests, are used to secure the crank to the axle (spindle) of the bottom bracket (BB). It's better to buy a new set of crank arms and replace the existing ones. The only fix to that is a new crank arm. I'm in the habit of doing up the bolts pretty tight. The CCW-5C has both the hex and socket and the long . Get it as soon as Wednesday, Sep 28. A 16mm socket wrench fits the flange nut. $14.99. Alan Braggins. Bikes. Thanks in advance. You'll know it's working because you can tighten down the bolts really tight without the bearings binding. If you are using an Allen Wrench, insert the head of the wrench into socket located on the pedal arm. Make sure that it is fully inserted and flush with . 6. He had to remove the pedal crank to tighten it and put some blue thread locker on the bolts. I don't do jumps or anything crazy just hills roots and rocks. Step 3: Replace Or Repair. Pedal crank keeps coming loose. Can't figure out what you mean by "replacing the spline". It can, in some situations, come loose on its own. are damaged or the interface on the crank arm is damaged. 0 mm Spindle Interface Type Square Taper ISO Weight 575. Just as with vibration, this slippage can ultimately lead to loosening of the bolts. Open to suggestions! Posts: 1,505 #21. Below are the best information and knowledge on the subject square taper crank arm keeps coming loose compiled and compiled by our own team bikehow: 1. Shimano 105 chainset keeps coming loose. Doomanic Wrecker Patreon Founding Member Jan 21, 2018 7,444 8,104 UK Apr 24, 2020 #2 Use an 8 mm Allen wrench to tighten the crank arm (D) to the system with a crank arm bolt (not shown). DaveM Hall of Famer. Tried a bit of locktite blue with no luck. LOCTITE 648) on the square taper is even better than grease. When I work on peoples' 8 spline cranks I like to have the edge of the spindle a tinyyy bit passed the pinch bolts. 11-11-2020, 09:52 AM. You might be lucky but once these work loose during use it is normally terminal for the soft alloy crank arm! But it won't last long. Apply threadlock (Loctite Blue . Remove crank arm, grease spindle, install arm and torque it down. 68mm 73mm Removal 1 Turn the TL-FC35 clockwise to remove the crank arm cap. Tightened up enough to ride home but was loose again 2 miles later. Also, my mid drive motor is starting to sag, meaning it is not staying tight against the frame and is hanging lower than is preferred Again, any ideas about how to keep things tight are appreciated! It fell off when my son was riding it. The bolt then is loose and if the bolt retention cap (it isn't a dust cap since we're not interested in preventing dust from going in there but in preventing from the bolt falling out) isn't on, you lose your bolt. WHY me! I'm having the same issue with the left crank arm, which gets loose and contributes to noise when pedaling. Replacement crank arm (or both crank arms) is the only solution. hottrods crank . It does not matter how tight the retaining bolt is done up the deformed crank arm will continue to come loose. Got advice? If you are using a Smart Wrench, place the jaws on the nut located between the pedal and pedal arm. A worn cotter can cause a loose crank. My crank arm bolts keep coming loose after a long ride. As aluminum is more flexible than steel, the thread gets damaged. The first thing to do is to try and re-tighten the crank arm on to the bottom bracket axle. Profile factory instructions recommend that the bearing cup stick out slightly to ensure the spacer is doing its job. Posted: Oct 28, 2007 at 9:41 Quote: Get a new cranksset and make sure you tighten the bolts before/after every ride. Wired Out Spindle: 1) Remove the non-drive side crank arm and remove the crankset from the bottom bracket. Crank arm fixing bolt Crank arm cap TL-FC35 TL-FC35 8 mm Allen key Left-side crank arm Spacer installation method 1 Check whether the width of the bottom bracket shell is 68 mm or 73 mm. If you suddenly stop the crank the centrifugal force of the bolt will cause it to try and tighten itself. Quality, value, and durability come together to keep you cranking for many, many miles. (Rail 7) Mine does every single ride now. but remember each time they loosen is one step closer to the "dead parts bin" v ssaddict Monkey Oct 4, 2001 472 0 If you never want a issue again, buy a Shimano M440 crankset (or something similar) and possibily a new bb (if the bb you have is the right length you'll be 'ok'). What size is a crank arm bolt? which is that thin piece of plastic in the slot on the crank arm. Bottom Bracket is Loose or Damaged This can happen if you hit a big bump while riding or if your bike falls over. My ex husband used a torque wrench to put the new crank arm on. HR+3 ballanced and welded, 13/1 wiesco moly, port and polish, stainless oem intakes, hrc camshaft dyno jet needle no box w/pro design intake, full Ti FMF 4.1, pro armor fat bar and pegs, lsr + 2.5" a-arms, GT thunder xc link, full jet suspension stealth kit, motoxperts transmission cut mod, pro taper 1 1/8 raptor bend bars, piaa extreem white headlamps, red l.e.d. The arms are the weaker part. The crank arm (D) should be parallel with the propeller (G) and the shaft (F) of the drive unit. Aug 15, 2006. assuming that it's a square taper crank, as i've never seen a suntour crank that hasn't been, once the crnk arm comes loose and wiggles around, it needs to be . Square Taper Crank Arm Keeps Coming Loose Proper seat pressure (working through the rocker arm and pushrod) is necessary to keep the hydraulic lifter plunger centered in the lifter body to prevent . But the cheap alloys are soft enough that as JRA says, you have to constantly check the bolt and pedals to make sure they are tight. NOTE: It is imperative the propeller (G) and the crank arms (C, D) are aligned properly . Any damage will not be visible from the front as the axle doesn't (shouldn't) protrude that far, look at the square from the back to see any damage. To tighten the non driveside arm, insert the 8mm allen, and place the cranks in a horizontal position, with the driveside arm and the allen (in the non drive side) pointing to the front. Unfortunately the only solution if this is the case is replacing the crankset. An eBike is heavier than a standard bike, and that also adds to the load on the crank arms. One thing you could try is to remove the crank arm, clean both mating parts, put a light smear of grease on the axle, refit and tighten well but not . Step 2. Thread starter postedoverseas; Start date May 1, 2007; Forums. if you've lost. The only solution is new cranks. A retaining compound (e.g. Unfortunately, you can reach the specified torque on a "dry" spindle before the crankset is properly tightened down. If you rapidly increase the speed of the crankshaft the bolt has the potential to not keep up with that increase which would cause it to loosen up. The left pedals broke (I think he installed them incorrectly) and we had to order new parts, the crank arm and pedals. If yours keep loosening, you can upgrade the arms pretty cheaply. The left side crank arm gets alittle wobble after a couple miles of XC riding. Epessa Crank Arm Left Available in Diamond Hole and Square Hole,170mm. Why is my crank arm keep coming loose? While they are another of those parts that may go largely unnoticed by most riders - sometimes they are even covered by a dust cap - they may become loose and worn over time and require replacement. taper, isis or octalink, they will wallow enough to lose their taper and not want to stay tight no matter how much lock tite and ft. lb. 2) Take a look at the end of the spindle where the non-drive side crank arm attaches and ensure that splines as well as the threads inside the spindle are in good shape. Typically, 300 inch-pound is considered a minimum torque, which is 50 pounds of effort holding a wrench six inches from the bolt. This is usually due to wear and tear on the bolts that hold them in place. Now, holding the allen still, push down on the pedal as firmly as needed. At first the bolt broke on the pully replaced the pully and bolt and washer, drove the car 30 miles the bolt come loose replaced the bolt and washer again drove the car maybe 200 miles again the pully has come loose, I bought the car in september I have nothing but problems. Joined: Aug 2008. Rotate and slide the crank arm out of the bottom bracket shell. Most of the time when I try and tighten the "crank" the left hand bolt (the lone pedal stem) is not as loose as the righht hand side (the side with the chain). If you've been repeatedly riding with a loose crank arm it could be that it's now damaged. Alternatively to paying 50 for a crank arm that might fix the problem, you could buy a completely new SLX crank, which comes with rings, bolts, a shiny new BB for the princely sum of 60 . Replacement crank arms are avaiable for cheap. To fix this, simply tighten the bolts with a wrench or Allen key. Square tapered as well as Shimano Octalink and ISIS Drive splined bottom bracket spindles require that either a 14mm socket or 8mm hex crank bolt be removed prior to pulling the crank arms. It's difficult to see any damage in your picture as inside the square hole is blurred. of torque you apply to the bolt. The only . blue Loctite, but in a pinch any kind of glue works) on the threads. Sometimes, the bolt gets lose and rubs with the threads. Replacement crank arms are avaiable for cheap. If the alloy crank gets loose and is ridden on the hard steel spindle wallows out the relatively soft alloy. crank bolt keeps coming loose in Mechanics' Lounge. 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