October '17

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14 PRECISION ENGINE OCTOBER 2017 PRECISION ENGINE 1 Once the hose has been cut to length, the hose must be inserted into the hose end. For the first-time installer, this can prove challenging and sometimes frustrating. In some cases, you may be able to wiggle and push the hose into the hose end's collar, but to make things easier, secure the hose end collar onto a bench vise with a pair of alu- minum jaws that feature V-cuts designed to secure the hex of a hose end collar. To simplify the task, I strongly recom- mend using a hose assembly specialty tool made by Koul Tools (available in all –AN sizes. In this case, we're using their –4 tool, which is in their kit P/N 468 that includes –4, -6 and –8 tools). Separate the two halves of the Koul Tool and place the hose end collar into the cavity, orienting the hose end so that the hose entry end is facing the tapered end of the tool. Snap the tool halves together, and place the tool in a bench vise with the tapered entry end facing outward. Insert the hose into the funneled, tapered end of the tool, engaging the hose end. Using inward pressure and a rotating motion, insert the hose until it stops. Remove the tool from the vise, separate the tool and inspect the hose end inside the female threaded end. The end of the hose should be located just under the threads. 2 Before attempting to assemble the hose end collar to the hose end, wrap a piece of tape around the hose at the base of the collar. This will provide a refer- ence of hose-to-collar depth engagement when you assemble the hose end. 3 Next, secure the hose and hose end onto a bench vise, with the hex of the hose end secured in a pair of aluminum –AN vise jaws, with the exposed end of the hose end collar slightly pro- truding from the vise jaws. 4 Lightly lubricate the hose end threads with a thin oil. Insert the hose end nipple into the collar, engaging the nipple into the entry of the hose. Apply a pushing pres- sure as you engage the threads. Be very careful to maintain a straight entrance to avoid cocking and cross-threading. Once the threads begin to properly engage, use a 9/16-inch open-end wrench (preferably an aluminum –4 wrench) to fully thread the hose end into position. While threading, keep an eye on the ref- erence tape. If the tape begins to excessively move away from the hose end collar, this means that you're pushing the hose out, in which case you'll need to start over. You can expect the tape to move slightly (perhaps 1/8-inch or so), which is fine, as long as the nipple remains seated inside With the hose end hex collar secured in aluminum AN jaws in a bench vise, lightly oil the hose end's male threads with a thin lube such as WD-40. Insert to engage the nipple into the hose, and start the threads, being careful not to cross-thread. Examine the depth of the hose. It should be just short of the female threads. There's no need to butt the hose directly flush to the threads. Use an open-end wrench to thread the hose end together. Ideally, an aluminum –AN wrench is the best choice. If not available, use a clean steel wrench and be careful not to scratch or mar the anodized finish. In the case of our –4 hose ends, we used a 9/16-inch wrench. Cylinder Head Steam Plumbing

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