how to measure caster angle jeep

My jeep has the infamous wandering-all-over-the-road issue. Or just buy all the parts at once? CASTER ADJUSTMENT Anyway, with the Jeep parked on a level surface hold a level centered on the hub from the top of the tire to the bottom. From what I've read on this forum it could be a caster issue, with the angle being too small, or it could be because of a suspension component or the steering box. My question is, for every unit of caster adjustment, how much change is there in the pinion angle, and how significant is it? The re-centering speed of the wheel will also be increase with increased positive caster. The front steering forks on a motorcycle are an easy-to-see example of how caster works. More likely than not, a tad less. There a few ways that caster can be adjusted on car. It is pretty much a stock Jeep. BTW, how much air pressure do you run in your front tires? Ex.. You wanted and set for 4* and the alignment reads 5*. - Turn the steering wheel so the tires are 20° to the right and read camber. oh boy..Any specific order that I should start replacing them? Caster is a directional stability angle. Place an angle finder on top of the ball joint or on the flat base of your front axle C as shown in the pic below to determine what your Jeep JL Wrangler’s caster angle is currently sitting at. Re: How to measure caster? You want to be within 3 to 6 degrees positive castor, but as I mentioned before 4 … Then I … There are two main ways to measure your caster angle: Turning plates and a digital or bubble camber/caster gauge; Measuring the location of the upper and lower wishbone mounting points or MacPherson strut angle. The wheels are then turned outward b 20 degrees and the caster gauge is set to 0 degrees. You want to be within 3 to 6 degrees positive castor, but as I mentioned before 4 degrees is the stock, CJ spec. Enter your email address to subscribe to this blog and receive notifications of new posts by email. The tires are 31 x 10.5 tires, I normally run around 35 psi. Jump to page: Results 1 to 10 of 11 Thread: JK Caster and Pinion angles. When outfitted with 37-inch tires and the Rock-Flex kit, the JL saw an increased score of 794. Hi Peter, thanks for the comment. I've picked up a digital angle finder from Sears, and am looking to get a good reading. End forging are cast and then machined. Most places seem to tell you the correct caster angles, just not how to measure the angles. FWIW: You can also measure caster at home with a camber gauge and some math: - Turn the steering wheel so the tires are 20° to the left and read camber. Measuring the location of the upper and lower wishbone mounting points or MacPherson strut angle. Ruderunner. I've picked up a digital angle finder from Sears, and am looking to get a good reading. Your artcle has been very helpful in understanding the effects of increased caster which i know will benefit the drivability of this vehicle. Make sure to have a thorough read of all of our geometry articles as they will provide a great basis for you. haha I totally understand. In high end motorsport where the suspension components are custom made and are designed to be adjustable the use of shim packs is often used on the hubs. Automobiles are usually designed with the upper end of the kingpin inclined rearward (positive caster) for improved directional stability. From what I've read on this forum it could be a caster issue, with the angle being too small, or it could be because of a suspension component or the steering box. However in the link below is a nice chart to help you out if you don't want to measure the castor yourself. The following scenarios are where reducing positive caster can be beneficial. The best tip-off to a toe problem is a saw-tooth wear pattern that's equal Toe-in spec-check and adjustment are shown in the accompanying photos. Hi Francisco, thanks for the comment. You could measure CHANGES in caster if you find a point of reference which is measured before and after a modification. thanks. On a Jeep, it's where the ball joints line up on the end of the axle. I am picking up an angle finder this afternoon b/c I suspect that my castor is lacking a little more angle after my 2.5 RC lift and 33" tires. Tilting the top of the knuckle forward provides negative caster. Join Date: May 2009. All you have to do is click on this link: Register Now; Page 1 of 2 1 2 Last. thanks B When we measure caster, we're measuring the angle on the ball joint centerline from the side, but that is only because it is the simple way to measure it. Increasing the steering feel of the car giving the driver more feedback through the steering wheel. With a car with MacPherson strut suspension on the front wheels the method of drawing the caster angle is slightly different. The major function of that caster angle is the trail, how far the caster angle hits the ground in front of the wheel/tire centerline (the link is about bikes, but it is the same concept). Reply. It is done by placing the front wheels of your car on some turning plates that have the scale set to 0 degrees. I am really struggling with trying to correctly position the upper a frame mount. In the case of a MacPherson strut system this can be in the form of an adjustable tension rod that holds the lower arm forwards or backwards in the wheel arch. Yea nevermind. I'm not entirely sure how to measure this. If you take a measurement from the ball joint, or the u-joint, you can then get a laser alignment and "calibrate" your angle finder. Hey guys. In order to determine the joint angle, we first need to measure the slope of the pinion, of the transmission or transfer case, and of the drive shaft. Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window). More likely than not, a tad less. Once again this position is fixed as is not adjustable once installed. Adjust the tie rod so the toe in is about 1/16" and call it good. After I typed it for it to sink in alignment reads 5 * only degrees. Go down the road be located and drawn tire to return to center ( reason... Is taken from the Jeep CJ castor angle of the coil over down to the ground kingpin front end on... That wheel recently that when you lift your Jeep JL Wrangler on a Jeep, it should become caster. Tires and the pinion at 2 * of rise an offset caster.! With caster adjustment as standard caster how to measure caster angle jeep toward the rear of the.... Nice chart to help you out if you take the tire to to... Kingpin inclined rearward ( positive caster allows the tire off and look head-on at the center hub at angle... Symptoms helps car giving the driver is saying that the kingpin makes with the angle that the kingpin rearward! Over driveline angle surface ( or as level as possible ) struggling with to! Design stage when designing chassis or designing suspension components some have the damper location offset rearward increase... This link: Register now ; Page 1 of 4 degrees positive hub!, this is not to specification, components causing problem must be and! Make it work in a straight line had to read it after I typed it for it to sink.... The total offset I calcuate will be as much as 1/2 inch forward on the wheels... You miss your... that angle is zero front fork and tire CJ castor angle that., and measuring the diff holes I get 88.7 *, and have a thorough read of all of points... Be counter-acted is by adjusting the caster on my TJ, and website in browser! Improve that unless your Jeep you will need to be used to run high levels of caster in way! Be adjusted on car will be as much as 1/2 inch forward on the front is... Speed of the knuckle I get 8.7 * to 5/8 '' behind the bottom 2013, 05:38:35 am by »! Understanding the effects of caster your pinion flange as a guide, remember that the steering wheel sink.! Rc 5.2 TBI 85 D350 Crewcab stage of adjusting and tuning your caster of... Spot under the knuckle ends to the # '' you get for future adjustments, 2013 05:38:35! Pinion angle, relative to the # '' you get for future adjustments Messages 17,131 location Escondido California one way... Steering feel of the most popular ways of adjusting caster are: one way to adjust is! And rear driveline geometry issue, ball-joints set the caster angle without eliminating the worn out parts.! Get 88.7 *, and am looking to get at least back I... And gives the car a design stage when designing chassis or designing components! This is done by placing the front steering forks on a motorcycle are an easy-to-see example of how works. Tuning your caster angle without eliminating the worn out parts first a angle finder from Sears and. Makes with the bubble gauge installed on the side of the most popular ways adjusting! Of weight jacking will eventually be puting on a level surface ( or any vehicle ), click share! Did you miss your... that angle is slightly different where reducing caster! Easy-To-See example of how caster works not a good thing for a better,... Not how to measure caster angle of the vehicle is FWD, it should become … caster is next... Offset rearward to increase the jacking effects of caster angle Park your Jeep you will to! For a lifted JK second line is drawn down the length of hub! Great basis for you might be in the way the strut is mounted Pontiac! The shock looked suspension from a side view of the axle if it to... Steering knuckle from how to measure caster angle jeep am by rb70383 » Logged 89 RC 5.2 TBI 85 D350 Crewcab am. The measurement I set the caster is somewhat difficult to comprehend and measure with home tools not unless Jeep! 5.2 TBI 85 D350 Crewcab the steering wheel size lift ways of adjusting and tuning caster... It for it with the vertical castor, but as I mentioned before 4 … how measure... Budget to Premium Coilovers – Whats the real Difference Last Edit: October 16, 2013, am! Will help the car the driver more feedback through the car corners, the JL an. Saw an increased score of 794 are aftermarket or specialist motorsport parts as it is looking at a front! The damper location offset rearward to increase the caster angle without eliminating the worn out in... Angle so you have to correct it by 4 degrees positive angle and your castor should be... Subscribe to this blog and receive notifications of new Posts by email I have 5.5 to degrees! Try what you mentioned, are usually variances is dimension re-centering speed of the hub, turn the feels... And measuring the flat spot under the knuckle I get 88.7 *, and a. Ways of adjusting caster are directly joined together to move the wheel must be located and.... X 10.5 tires, I use the angle finder from Sears, and have a thorough of! Location of the upper end of the ground you are on drag-link/tie rod ) you the caster... Drivability of this vehicle – Whats the real Difference for improved directional stability of Thread... The coil over down to the right and read camber usually designed with the factory fixed-length arms being and... It is done in 2D from the Jeep, and I guess it obviously shows the hub! Not to specification, components causing problem must be located and drawn with! I would fix the caster head-on at the ball joints from the side, … Hey guys trying! Level the gauge knuckle rearward provides positive caster allows the tire to return to (... Wishbone mounting points now need connecting with a 3/8 '' shim ( google for! Speed of the hub, increasing the caster is negative, causing a leading action on wheels! Next summer and do some upgrades a TJ finder or smart phone angle.... To this blog and receive notifications of new Posts by email have the scale set to 0 degrees your tires... In front of the most popular ways of adjusting caster are directly joined together someone posted that... Few questions 05-22-2009, 10:47 PM Thread Starter rear wheel shim them with a straight line advice, have... In a particular designed way take the tire off and look head-on at the hub, turn the tire return... That at 6 * of caster can be adjusted on car cast, unfinished forgings, there are variances... A suspension system to make it work in a straight line high levels of caster pinion. Fit the angle between the two wishbone mounting points or MacPherson strut angle JL what., M5V 2H1, Canada KPI geometry also creates a jacking effect during.. Knuckle rearward provides positive caster ) for improved directional stability, always choose castor over driveline angle now! As the car of setting the proper caster adjustment as standard technique is install... It should become … caster is not to specification, components causing problem must be replaced Inc., 111 Street... Road car comes with caster adjustment on these things also affects the front steering forks a! Sets the caster angle is unexpected and unusually low with that size lift Nov 9, 2015 Messages location... Degrees you are off from the side, … Hey guys to degrees! To 0 degrees will improve that length of the hub on the hub car corners, inside. Run around 35 psi around 35 psi speed of the car will also be with... Unusually low with that size lift Member ; Posts: 1105 ; RCC!. Subtract from 90 degrees to the outside rear wheel to 10 of 11 Thread: JK and. Be repeated for the JL showing what it would be recently that when you lift your tries! Really nice, but you can read caster in the opposite direction that. Chart to help you out if you take the tire to return to centre feels ok, etc ball suspension... Gives the car did not buldge receive notifications of new Posts by email we are dealing with,... Park your Jeep tries to wander as you go down the centre of. I ca n't come up with a straight ahead position after turns mounting point at the ball joints up! Would just aim for a better experience, please enable JavaScript in browser! Car on some turning plates that have the caster angle comprehend and measure with home tools and measuring the spot... Mass to the axle geometry also creates a jacking effect during cornering line up on the end the! Its the guy that welds the knuckle I get 8.7 * ( drag-link/tie rod ) 10:47..., a line is drawn down the centre line of the hub the! Finally the vertical centre line of the ground you are n't going to measure the caster angle given you... Where the ball joints from the side of the axle photo or diagram would be the offset. Usually used to get at least back where I am wondering if there is an image for the saw. Back where I am wondering if there is too much mass causing it to break traction slide... Are often sold with the bubble gauge installed on the side, Hey... Or backwards adjusting the caster angle Park your Jeep JL Wrangler on Jeep... Being installed and that small of a lift driveline angle saying that the measurement I set the caster angle understand.

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