The caster in this vehicle is read four degrees plus or minus one half degrees (.5°). 13) Perform alignment and recheck. Also consider the condition of suspension components such as bushings, ball joints and shock absorber mounts. When the tires encounter a road surface with diminished traction (water, snow or ice), the tire that hits the less tractive side of the road loses its grip, favoring the opposite tire on the same axle, which can tend to pull the vehicle in the direction of the toe angle. Motorhome data, features and specifications This section of the site provides a helpful guide to specifications and features for a wide range of over 820 motorhomes and RVs. Perform steps 2-13 again. A zero-toe angle exists if the distance between the front of the wheels (ahead of axle centerline) is identical to the distance between the wheels behind the axle centerline. "Warning! Alignment assumes even greater importance as vehicle performance increases. There is no caster setting for the rear of a vehicle. © 2020 Good Sam Enterprises, LLC. The age-old method of centerline two wheel alignment does not consider the rear wheel positions, and should not be employed because it ignores the thrust direction of the rear axle. Reflecting decades of Tiffin innovation, the PowerGlide delivers everything an owner could wish for -- durability, reliability, performance, and control. Drivers in the snow belt region of the country commonly experience this when they upgrade to a plus-size tire and wheel package, or when they change over from winter tires to summer tires. Another important part of an alignment here at Brazel's RV Performance is that we check for front-to-rear wheel misalignment, or thrust angle alignment. For the performance-minded driver, a performance alignment is preferred, which simply means that you should take advantage of the vehicle maker’s tolerance range of wheel angles to choose the settings that will maximize the tires’ performance. This is a perfect example of why it’s important to inspect suspension and steering components prior to performing any wheel alignment. Most gearheads understand the basic definitions of caster, camber, and toe, but when it comes to actually measuring or setting these wheel-alignment specs… To alter camber, the adjustment must be performed equally at front and rear attachment points, to move the upper arm pivot inboard or outboard. Choose the desired trim / style from the dropdown list to see the corresponding specs. Send them to [email protected]. Track settings are for the track, street settings are for the street. This original 1974 FMC 2900R Motorhome is listed on eBay with a price of $2,025 and there are over five days left on the auction. But, a toeout can also result in a darty, less decisive straight-ahead condition at speed, especially in wet or slippery conditions. Toe-in, a positive setting, exists if the tires are pointing in at the front — in other words, if the front of the steer tires are closer to each other than the backs. If either the SAI or IA are outside of the OE specification, this indicates that damage has occurred, such as a bent control arm, bent strut, dislocated strut tower, etc. To achieve front rear adjustment of caster, an aftermarket adjustable top mount is usually required. For more information about Ford Credit and access to the Account Manager, go to If a vehicle is intended only for off-road use, deviating from stock settings will be necessary in order to maximize the tire contact patch during hard cornering and to enhance turn-in response. For high-performance driving, a negative camber angle is preferred, to compensate for the lateral forces experienced in cornering. Live rear axles will feature no toe angle adjustment, since this is a fixed angle. It protects the store from having customers return, saying their tires aren’t wearing well, or are ruined, etc., and it does help the store’s bottom line. Manufactured in 23 and 26 ft (7.0 and 7.9 m) lengths, the design was noted for its front-wheel drive and its low profile, fully integrated body. Motorhome (TY3) Canada/United States of America, enUSA, First Printing Introduction. As a rear-drive vehicle moves forward, the front wheels may tend to try to crawl away from each other, while a front-wheel-drive vehicle’s front wheels may try to crawl inboard. When the lines intersect below the road surface, the condition is called positive scrub. The cost for … A more positive caster angle contributes to directional stability at speed, and aids in steering wheel return, helping the steering to return to a straight-ahead position after a turn. A toe in of about 1/16 to 3/16 should be good. Front Suspension and Alignment. F53 Chassis Cab/ F59 Commercial Chassis 91 esourcebook.dealerconnection.com February 2015 RE&T: 2016 Source Book F53 Super Duty Motorhome Chassis Dimensions F53 Class A Motorhome Chassis(1) Wheelbase (in.) tiffin-specs. Since these two lines will eventually intersect, it’s this intersection point that we’re really interested in. Even if all the tires are aimed straight ahead when the vehicle is in motion, a wheel that’s cambered naturally wants to turn. Centerline steering refers simply to a “straight and level” steering wheel clock position when the vehicle rolls in a straight line. How often should this type of motorhome have an alignment? As the miles pile up, coupled with age, suspension components gradually wear and/or deteriorate. Most tire stores try to sell an alignment whenever new front tires are installed as a routine practice. Viewed from the front of the vehicle, steering axis inclination (SAI) is a nonadjustable angle between a true vertical drawn through the center of the tire and a line drawn through the upper and lower ball joints. A preferred approach is thrust line or thrust angle alignment, which considers the actual location and direction of the rear wheels. 4) Inexpensive enough that each of the clubs can afford to acquire one and make it available ... the factory specs … A supplementary verification is also strongly recommended at 20,000km (12000 miles). RV Tech Savvy: What’s Wrong With the Wiring on the Motorhome? For a performance setting, you need to consider how the vehicle is to be driven (re the driver’s expectations) to achieve an acceptable balance between cornering traction and tire tread wear. The SAI is determined at the point in which these two lines intersect. Adding these brace bars won’t degrade ride (won’t result in a stiff ride), but they will prevent unwanted chassis flex, allowing set camber angles to remain more constant. It’s located in Spokane, Washington and I can’t think of a better place to start, or end, your vacation; it’s a beautiful area. Extreme positive or negative camber settings will make a vehicle more sensitive, especially when only one wheel at a time encounters a longitudinal rut and/or groove. 14) Once satisfied with alignment. As you increase negative camber, the inside tread area will tend to wear faster than the rest of the tread when the vehicle is driven in a straight line; but if the driver is aggressive in turns, insufficient negative camber will allow the tire to “roll” excessively, reducing the tire contact patch. A toe-out condition (also called a negative toe angle) is present when the wheels are farther apart at the front and closer together behind the axle centerline. 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