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Just found something out

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Randy

02-03-2003 10:39:36




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I learned something today and thought I would share it with others. I need to pressurize the cooling system on my truck and didn't know how to do it. A guy I work with says he puts a section on bicyle inner tube over the radiator opening that has the valve on it. He seals off the other end of the tube with a plug and a clamp. He clamps the other end around the radiator opening.
He then puts a clamp on tube going back to overflow reservoir. Now you can add pressure to the system and not worry about adding to much pressure as the tube will bulge out. He said you want the level in the radiator to be down a little. I'm going to get a tube and make one of these tonight.

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Gary

02-05-2003 11:07:50




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 Re: Just found something out in reply to Randy, 02-03-2003 10:39:36  
I got $150.00 from a farm magazine several years ago for the bicycle inner tube idea. I have just learned a new one from someone else. Use the blower side of a vacuum cleaneron a radiator along with some soap bubbles. If it's a bad leak, reverse the flow to vacuum, doodle the hole out a little with your pocket knife, and inject some epoxy into the hole. Make sure you give the vacuum cleaner time to pullsome amount of vacuum on the system. If you're lucky, you can fashion a hose to the filler of the radiator and never even pull any hoses. I've seen this done, haven't tried it. I have built a caster gage with a piece of pipe that fits over the part of the ball joint bolt extending through the nut. Cut the pipe so that it extends to the top balljoint, then cut out half of the pipe. Weld a 3 quarter inch square tubing at a perfect 90 degree to the pipe, Hang this on the ball joint bolts, Use an angle finder with a magnetic base.Make the tubing long enough toextend just past your tire, so you read it easily. In case your vehicle is not on a level surface, you cross check your reading at the front by hanging it from the rear. The two readings should exactly offset each other. I built one to use on the race car. It worked so well I built one to fit my trcuk.

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Frank (nmi)

02-03-2003 14:33:24




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 Re: Just found something out in reply to Randy, 02-03-2003 10:39:36  
One of the guys on one of the automobile forums that I lurk on was talking about how he just bought an extra rad. cap and then drilled a 7/16" hole in the center and inserted a valve stem. Not sure how he got the stem through the hole without deforming it. Possibly heated the stem in hot water first?



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dean

02-03-2003 14:02:46




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 Re: Just found something out in reply to Randy, 02-03-2003 10:39:36  
the tool that is referred to has different caps for diff rad neck sizes and runs around $100.00 to $150.00..they are available from kd tools mac and snap-on as well. the problem i have is that they dont have a large cap that fits most of the tractor radiators. i work at a radiator manufacturer and if testing underpressure on new radiators we use about 15 to 18 lbs on heavy equip radiators... old radiators will only withstand about 6 to 8 lbs of pressure before you split a tube seam or create a tank to header or tube to header leak so be careful..to much pressure will cause lots of harm to an otherwise easily fixable unit.

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Bill Smith

02-03-2003 12:00:44




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 Re: Just found something out in reply to Randy, 02-03-2003 10:39:36  
They make a special radiator cap that you can buy and put on a radiator and add pressure. Its kind of a instrument sort of deal. It fits on radiator just like a standard cap. Has a rubber hose on it and with a rubber tipped blow nosel on a air hose you can blow the air in. Has a pressure guage so you can tell how much pressure is on the coolant system. For a 15 pound radiator cap system, simply blow it up to 15 pounds. It has a button on there to push to let the pressure off. Just making a point that a more suffisticated tool can be store bought. If you can't find one, check with a radiator repair shop. If they won't loan you one, they would shure be able to tell you where to get one.

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Randy

02-03-2003 12:51:09




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 Re: Re: Just found something out in reply to Bill Smith, 02-03-2003 12:00:44  
The thing is, is that this is something a person doesn't use very often and The cost of a bike inner tube has got to be less then that fancy pressure cap your talking about. I guess I would have one of those if I was a mechanic. I just thought this was a quick inexpensive way to get pressure on the system.



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Bill Smith

02-04-2003 09:37:35




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 Re: Re: Re: Just found something out in reply to Randy, 02-03-2003 12:51:09  
Damage can be done to coolant system if to much air pressure is put in system. Also, if you are inspecting for leaks and what have ya, alot of times you have to have the maximum pressure of the system to fing the leaks. Adding 5 pounds of pressure to a 15 pound system is likely to not do you any good. I have seen many gaskets and hose clamps and so on that would not seap or leak untill the maximum pressure was applied. Also if you find a seap or leak, the extra safe amount of pressure on system is real nice to help locate the exact location. Seen many times, when pin pointing a leak on the front of engine was not an easy task. The extra pressure made the difference.

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Randy

02-03-2003 10:58:43




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 Re: Just found something out in reply to Randy, 02-03-2003 10:39:36  
I was wrong about not having to worry about the amount of pressure. Just put a little air in and check with guage. Do not go over the pressure listed on your cap or in your manual.



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