Exhaust clamps for HGV: types, selection, and fitment
There are two main clamp types used on HGV exhaust systems. Saddle clamps, also called U-bolt clamps, are the most common. They grip the outside of an overlapping slip joint and are simple to fit but depend on correct torque to seal reliably. Under-tightening leaves a path for exhaust gas; over-tightening deforms the pipe. The torque specification is on the clamp packaging and should always be followed.
V-band clamps are used where a flange-to-flange joint is fitted, typically at turbo outlets, DPF connections, and SCR inlet flanges. They provide a full 360-degree seal and are quick to remove for servicing. On HGVs running aftertreatment systems, V-band clamps at the DPF and SCR connections are a common maintenance item.
Select clamps by pipe outside diameter. Most HGV saddle clamps are sized in millimetres. If the exhaust pipe has been repaired previously and the original diameter is unclear, measure directly before ordering.
Frequently Asked Questions
How do I know which exhaust clamp size I need for my HGV?
Measure the outside diameter of the exhaust pipe at the joint location. Saddle clamps are sized to the pipe OD in millimetres. For V-band connections, measure the flange diameter. If you are replacing an existing clamp, the size is usually stamped on it or visible on the original packaging.
What causes exhaust clamps to fail on trucks?
The main causes are corrosion from road salt and moisture, fatigue from thermal cycling as the exhaust expands and contracts, and under-torquing at fitting. Stainless steel clamps are worth specifying for longevity on working vehicles.
Can I reuse an exhaust clamp after removal?
A clamp that shows no corrosion, distortion, or thread damage can be reused. In practice, the U-bolt threads on saddle clamps are often corroded by the time the clamp is removed. Replacement is usually cheaper than the risk of a failed refit. Always replace the nut if there is any doubt about thread condition.
Do I need a specialist tool to fit exhaust clamps?
No specialist tooling is required beyond a torque wrench. The correct torque value is specified by the clamp manufacturer and should be applied to avoid under-sealing or pipe damage. Anti-seize compound on the bolt threads helps with future removal.
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