POLYAIR units are designed and engineered for long life. Provided you take a little amount of care when selecting and fitting your Kit, maximum results will be obtained.
Stands or Jacks should be placed under differential housing so that dimensional relationship between vehicle chassis and Leaf Springs remains unaffected. A correctly attached chassis bracket has no stress on the attaching screws.
Kits are to be fitted not more than 40mm and not less than 20mm in front of or behind the differential housing, usually fitting instructions specify the correct location, depending on positions of break lines, exhaust pipes, petrol tanks, shock absorbers and other obstructions. Should any of these have been altered from original specifications, then repositioning of the Kit may be necessary.
Clearance from any obstructions should be a MINIMUM of 20mm (EXHAUST PIPES 60mm at all times).
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(a) Most bags can be fitted between the lowest coil opening when suspension is fully extended. Additional clearance between the coil may be obtained by removing lower shock absorber mountings and lowering suspension 30 - 50 mm.
(b) Bag should be a reasonably snug fit in the coil, however tolerance of ± 6mm is common.
CAUTION: Observe tension on brake hose, DO NOT STRAIN.
(c) If the vehicle has a hole between bag and spring seat/chassis of 50mm/2'' or more than half the diameter of the bag (whichever is the smaller) then a protector must be fitted. This is normally included in the Kit.
(d) Ensure that exhaust tail pipe is 60mm from Polyair Bag. If necessary loosen clamps and rotate or move to obtain additional clearance.
Leaf and Coil
All vehicle springs will sag, and the amount of sag depends on age and usage conditions (e.g. load variety, towing etc.) As the Kit is designed to fit the vehicle's "as new" specifications, an older vehicle will probably require a few more kPa's when unladen to restore it to original ride height and this factor will vary by how much the front may have sagged.
All Kits are supplied with fitting instructions and air extension hoses.
Should it be necessary, POLYAIR SPRINGS can supply Kits specially tailored to suit an off-standard situation such as Raised or Lowered Suspension Systems or BADLY SAGGED suspensions.
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