Technical Advice: Repairing a Leaking Radiator with Sockets and a Torch – on our site you will find the best spare parts and accessories for cars and motorcycles
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Technical Advice: Repairing a Leaking Radiator with Sockets and a Torch
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If you are looking for high quality products for your car or motorbike, look no further. We are sure you will find the perfect product for you at Racext. Do not hesitate to contact us with any questions or requests. We are here to help you make your vehicle perfect.Repairing a leaking radiator inlet is one of the latest tasks on my current project bike, and although it’s a straightforward fix, I’ve never seen a good account of this repair.
Motorcycle liquid cooling systems are quite robust. Consider the torture modern motocross bikes endure! However, coolant will always escape if it finds a way out of the system, and unless you regularly check coolant levels, a leak can turn into a major problem. Old hoses and faulty water pump gaskets are the usual suspects. Another failure mode I’ve seen over the years, and the topic of today’s practical article, is a bent radiator inlet. Trace your coolant leak, and if the issue is an inlet, you’ll see a leak where a hose connects to the radiator.
Radiator inlets can be damaged if care isn’t taken during the removal of old hoses. Over-tightened hose clamps can also cause problems. (I suspect this is how this Kawasaki ZRX1100 was damaged by the previous owner, who had a real issue with excessive tightening.) Inlet walls are thin, so it doesn’t take much to deform one in an accident, during shipping, or even bumping into something in storage. The good news? A propane torch and a handful of sockets should solve your problem for free. Try this method before shelling out for a new radiator.
Drain the coolant and remove the radiator If your bent rad is already off the bike, skip to the next step. For everyone else, get a clean container and drain the cooling system. Removal and cleaning will be much easier this way. Find and disconnect any associated wiring. You’ll probably have a fan and a temperature sensor to disconnect. Unscrew the radiator from the bike and move it to a clean workspace.
Identify the source, gather tools With the radiator on the bench, it should be easy to identify the leaking area. One of the inlets is obviously mangled. The other is passable, although not perfect. Let’s fix it.
You’ll need a variety of sockets and an extended, 8-10 inch long extension. Try to avoid short sockets and wobbly extensions, if possible. If the damage is severe, locking pliers and channel locks might come in handy.
Restore the shape Find the largest socket that fits the dented inlet and attach it to the extension. Fire up the torch and start heating the aluminum with the flame tip. Aim for persuasive heat, not destructive. (Not sure how hot is too hot? Mark bare aluminum on the heated area with a marker. If the mark disappears, you’re overheating.)
Having a friend move the torch to evenly heat the area during the next step is helpful, but you can also do it solo if you work quickly.
Attach the socket to the extension for an improvised forming tool. Using the extension as a handle, roll and push the dent with the socket. Focus on making room to fit the next socket, avoiding the temptation to do all the work with one size. Switch to larger sockets as soon as possible for the best results. Add a bit of heat, pull a bit more, and keep working back and forth until the inlet is round again. I had to use a small pair of channel locks to refine the edge of the burr before fitting my final socket.
Reinstall and inspect Check for burrs and sharp edges before reinstalling. Reinstall the radiator, refill the coolant system, and check for leaks after a few miles, just in case.
Coolant leaks are a headache, and radiators are expensive. Rather than spend €727.85 on a Kawasaki ZRX1100 radiator or roll the dice with a €100 unit from eBay, the above method got me back on the road, drip-free, in less than an hour. I’ve used this technique on motocross bikes, street bikes, and even some non-motorcycle projects. When it comes to occasional jobs like this, sometimes you already have the tools you need. You just have to see them in a new light. Shipping times are around 7 business days, and shipping is through negotiable fast shipping.
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Technical Advice: Repairing a Leaking Radiator with Sockets and a Torch
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