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Our News
13/02/2020
BALANCING YOUR DRIVESHAFT
Fitting your own Universal Joints
In order for your driveshaft to be dynamically balanced, the universal joints need to be fitted correctly without end float or radial play. Just fitting new universal joints using the standard clips supplied may contribute to an out of balance shaft.
Fitting your own Centre Bearings
Centre Hanger Bearings can cause a vibration when fitted to vehicles even after the shaft has been dynamically balanced. When the engine torque is applied during take-off, soft rubber allows the driveshaft to excessively move causing a vibration this would normally occur under acceleration. Hard rubber does not allow sufficient absorption of the torque and therefore transfers the vibration through the vehicle. Driveshaft NZ recommends using quality centre bearings over lower priced, lower quality units.
While all effort to balance your driveshaft after you have fitted components yourself, or products from another supplier, will be made. No responsibility will be assumed or undertaken by Driveshaft NZ.
13/02/2020
Choose your heart surgeon well
When you require a heart transplant you would typically not choose your surgeon on price, you pick the surgeon with the most experience because what he does can determine whether you wake up. The same applies to your vehicle.
Critical speed is the speed at which your driveshaft tube starts whipping and begins to fail causing massive damage to the vehicle and total destruction of the shaft itself. The length, weight and diameter all determine the max allowable safe operating speed of a driveshaft. (This is calculated at 0.85% of critical speed for a standard passenger car) While other companies will manufacture shafts outside of the SAE AE7 standards without warning or discussing the possible outcomes with the customer, Driveshaft NZ will not. Your safety and the safety of your family and other road users is paramount.
When Driveshaft NZ build your driveshaft, we build it to better than SAE AE7 specifications. For instance, max allowable runout for tube on a typical passenger vehicle is 0.020 in (.52mm) we only allow 0.003in (.06mm) when we build your new shaft.
A poorly engineered and built shaft is dangerous to you, your family and others on the road.
13/02/2020
Cardboard inside my Driveshaft?
Driveshafts sometimes have a cardboard tube rolled up and placed inside of the driveshaft tube. The reasoning behind this is to reduce the resonance and vibration that a shaft can make while rotating at a particular speed.
The cardboard is not usually glued into position, it is usually held in place by tension. As the age of the shaft increases, the cardboard can become loose and moves positions within the shaft effectively changing the balance of the shaft.
When Driveshaft NZ balance your driveshaft, we endeavour to ascertain if your shaft contains cardboard. We however cannot guarantee a balance if cardboard within the shaft moves. The only 100% effective way to identify shafts with cardboard is to cut them open.
Because it is not economical to cut the shaft and remove the cardboard for every balanced driveshaft, we recommend a wait and see approach. If your driveshaft is initially fine when it is fitted back onto the vehicle and a short period later, it develops a vibration, and you can be assured it is likely this issue.
Driveshaft NZ will balance the shaft a second time for you at no additional charge; however the cost to remove the cardboard will be on the customer.
19/02/2020
Staked in style universal joints
Driveshaft NZ use only OEM style staked replacement joints unlike some of the other so-called specialists. We have even seen some driveshaft shops use welded washers to hold in the joints. This is dodgy at best and seen as illegal if you read the NZTA rules regarding vehicle modification.
By welding washers to the yokes of your shaft, you harden the area where the staking is required to centralise and hold the joint into the yokes. You have effectively destroyed your driveshaft.
Other options are universal joints designed to fit the application where OEM staked joints are replaced with internal cir-clipped joints. These should only be used if the yoke journal is fully round without a taper so the cir-clip is fully seated along its entire length.