how to tell if you have an air leak

[Hyster]

How can you tell other than it's getting too hot? Is there a way to find the leak if you have one?

 

[ajames942]

hmmmm...I'm not sure but check all your lines, and i have hear about a bearing in the motor having a leak.. I'm not sure

 

[HeartBreak]

Well, if you have a huge leak, you'll see oil around it, and the engine will run like garbage provided it runs at all.

My favorite method of finding air leaks involves filling the engine with after run oil, and pressurizing it with canned air. Remove the exhaust from the engine, as well as the air filter. Next, rotate the crankshaft so the intake is open (open the carb and look down through it). Now, using a short piece of fuel tubing (about 3 inches), connect the tube of the canned air to the fuel inlet. While holding the engine so the exhaust and air intake are covered, GENTLY pressurize the engine. Count to three, and look for oil bubbling out.

Sometimes it works, sometimes it doesn't.

 

[Glass Bullet]

Ya, you'd probably notice it running hotter than normal




I have a question of my own: There is a crack in my fuel line about 1/3 of the way around, but it's on the nipple, about 1/4" away from the edge of the line. Should I replace this line, of is it probably not doing anything to the car? I didn't really notice any fuel around the crack. I have an extra tube, but when I went to pull the old one off it seemed to be glued in place or it was just tight on there. Should I just pull it off anyway, or should I unscrew the nipple?

p.s. I have an Exceed Forza

 

[alpinehyperlite]

For as cheap it would be to replace a fuel line, i'd do it just to be safe.

 

[MrClean]

For as cheap it would be to replace a fuel line, i'd do it just to be safe.

+1, I think fuel tubing is the least expensive thing to buy on a nitro. I just bought about 10' of it.....just in case. I think it was like $1.50 total.

 

[Hyster]

Yeah sounds like that would be the first thing to try sense it would be cheaper. I will make a note though. When it started over heating was when my buggy (Acme Condor 1:10) went end over end in the grass after a jump. I wonder if there is a crack in the cooling head? I will have to wait until I get back from Vacation and possibly try HeartBreak's method after try replacing the hose.

 

[HeartBreak]

If it went for a tumble, I'm going to guess you have a crack in the block down near your engine mounts. I've done this with my savage (unintentionally, of course).

 

[Mattyfats420]

I have a question of my own: There is a crack in my fuel line about 1/3 of the way around, but it's on the nipple, about 1/4" away from the edge of the line. Should I replace this line, of is it probably not doing anything to the car? I didn't really notice any fuel around the crack. I have an extra tube, but when I went to pull the old one off it seemed to be glued in place or it was just tight on there. Should I just pull it off anyway, or should I unscrew the nipple?

p.s. I have an Exceed Forza

some of the fuel tubing gets stuck around the nipple, if you yank on it, it should come off. if not take a hobby knife and cut it off. than clean it up a little and put a new piece of tubing on.

i wouldnt unscrew the nipple cuz they might break off

 

[Glass Bullet]

ok. thanks. i'll give that a try