Motorsport Plumbing Systems: Crimp Hose Ends
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Crimp Hose Ends
04.25
| 00:00 | Unlike push lock and reusable hose ends that can be assembled with basic hand tools, crimp hose ends require some relatively expensive and specialised equipment. |
| 00:09 | This is not a job commonly undertaken by a home enthusiast, but rather something a professional shop or race team might have the ability to do. |
| 00:18 | We'll discuss the process regardless, but from a simpler viewpoint, so we have a clear understanding of what's being done if we ever need to get hose ends crimped by a third party. |
| 00:29 | This is a service offered by various fitting suppliers, but the measurements needed are generally the same, being from the centreline of angular fittings to the end of straight fittings. |
| 00:40 | Naturally the angle of the fittings also needs to be specified and again this is typically done the same for each supplier, finding the angle of one fitting through clockwise counter rotation to the other. |
| 00:53 | Let's move onto the actual crimping process and to be clear from the start, each fitting manufacturer will use a slightly different process, so if you happen to be doing this yourself, make sure you review the instructions first. |
| 01:05 | The cutting process is the same as with reusable hose ends, we recommend using shears for a nice clean debris free cut. |
| 01:14 | With our hose cut to length, the first step is to slide the crimp collar over the end of the hose until it sits flush with the internal flange of the crimp collar. |
| 01:24 | Next the fitting is inserted into the hose, but not completely, only until there is about a one millimetre gap between the face of the fitting and the crimp collar. |
| 01:33 | The crimp collar is then slid over this gap against the face of the fitting and the collar locking flange will engage with the locking groove on the fitting. |
| 01:42 | Some supplier's products will have the crimp collar pre-installed, in this case it's a simpler process as the fitting can just be pushed directly into the hose until it's fully seated. |
| 01:53 | Following this, it's time to use the special equipment that makes this out of reach, or maybe just hard to justify for the average home enthusiast or privateer, and that's the crimping device. |
| 02:05 | This is a relatively large benchtop unit with air over hydraulic actuation or alternatively a hydraulic hand pump. |
| 02:12 | These are generally in the vicinity of about three thousand US dollars, so unless you're using it often it's probably hard to justify. |
| 02:20 | The crimp dies used in this machine are usually sold separately so you'll need a specific die for each size fitting. The lower half of the die is placed in the machine and then the hose with the fitting on it is positioned in the die, being careful not to move the fitting on the hose. |
| 02:38 | The upper half of the die can then be inserted and then the die pusher ring can be installed over the dies. As the name suggests, force is applied to this part to compress the dies and crimp the fitting. |
| 02:50 | Some lubricant between the outer die surfaces and the pusher ring will help slide smoothly and reduce wear and any risk of damage. |
| 02:59 | The die pusher ring is forced down by hand for now until the dies are snug up against the crimp collar on the fitting. We need to make sure the die covers the entire length of the crimp collar. |
| 03:11 | Next, the pusher cone is installed on the machine which transfers force from the hydraulic ram to the pusher ring and is pumped down until just touching the pusher ring. |
| 03:22 | If we're using an angled fitting this naturally needs to be orientated to clear the fitting through the relief. |
| 03:29 | At this point the crimp is ready to be made, but we need to double check the crimp collar is fully covered by the die and the fitting hasn't moved in the hose. |
| 03:38 | This is just a matter of pumping the device up to the specified pressure from the supplier for the specific fitting size. |
| 03:45 | After backing the pusher cone off, the crimped hose assembly can be removed and is ready for fitting to the vehicle or pressure testing which we'll cover in the next module. |
| 03:55 | Before doing that though, let's quickly recap the main points. |
| 03:59 | With the hose cut to length, the crimp collar and fitting can be assembled onto the end of the hose. |
| 04:04 | The process here is a bit different for each supplier so make sure you check their instructions. |
| 04:10 | Then the specific dies can be installed into the machine followed by the hose end, the pusher ring and cone. |
| 04:16 | With everything positioned correctly and lined up, pressure can be applied as required to crimp the fitting. |
