EnglishSubtitle: added by anonim
How to Test a Blown Head Gasket in Your Car
1 00:00:01,719 --> 00:00:07,519 Rev up your engines, today I'm going to tell you how to check to 2 00:00:07,519 --> 00:00:10,130 see if your engine is worn out inside and blown a head gasket, 3 00:00:10,130 --> 00:00:15,120 now head gaskets do exactly what they say, there's the head of the engine with the valves, 4 00:00:15,120 --> 00:00:19,910 then there's the gasket, the head gasket, and that bolts onto the block of the engine 5 00:00:19,910 --> 00:00:23,730 where to pistons are, head gaskets have lots of holes in them, they 6 00:00:23,730 --> 00:00:28,869 seal the pressure of the pistons going up and down, they seal the oil that goes through 7 00:00:28,869 --> 00:00:34,640 the galleys to lubricate the top of the engine and they seal the coolant holes that let coolant 8 00:00:34,640 --> 00:00:37,70 cool the engine so it doesn't overheat, and when they start to leak internally it 9 00:00:37,70 --> 00:00:43,850 can cost s small fortune to replace the head gaskets in a car, in the case of this Lexus, 10 00:00:43,850 --> 00:00:49,570 it's a big quad cam v8, if you're going to do a head gasket job on this, expect to spend 11 00:00:49,570 --> 00:00:54,0 thousands of dollars to do it correctly so many times people decide, hey their going 12 00:00:54,0 --> 00:00:56,900 to get rid of the car if it has a blown head gasket, 13 00:00:56,900 --> 00:01:00,160 so I'm going to show you how you can test to make sure whether it's blown or not, 14 00:01:00,160 --> 00:01:05,820 now if it's really blown and it's running poorly all you have to do is have a cold engine, 15 00:01:05,820 --> 00:01:08,220 this one sat all night, then remove the radiator cap, and start the 16 00:01:08,220 --> 00:01:19,750 engine, and if you see coolant and gas bubbling out right away, that means it's really blown, 17 00:01:19,750 --> 00:01:24,500 because your engine sucks in air, then inside the cylinders the gasoline is burnt and exploded 18 00:01:24,500 --> 00:01:29,950 and the hot gas comes out the exhaust, and all the exhaust gas is supposed to come out 19 00:01:29,950 --> 00:01:33,620 here, out the exhaust pipe, if on a cold engine and you start it and the 20 00:01:33,620 --> 00:01:37,80 gas starts coming out of here, that means that the head gasket is blown and it's pushing 21 00:01:37,80 --> 00:01:43,100 exhaust gas through the radiator, but often when head gasket leaks start, their kind of 22 00:01:43,100 --> 00:01:47,409 insidious, you might loose a little coolant over time and you don't see it leaking anywhere 23 00:01:47,409 --> 00:01:51,100 because the engine is burning it but it's not bad enough that it's going to make things 24 00:01:51,100 --> 00:01:54,909 bubble out, that's when you need a test like this, it's 25 00:01:54,909 --> 00:02:00,600 a test tube and the test liquid, you stick it in the radiator, but if you have to, first 26 00:02:00,600 --> 00:02:04,180 suck out some of the extra coolant here so that you don't suck any of the coolant into 27 00:02:04,180 --> 00:02:08,30 the testing device itself, then you put the tester over the radiator, 28 00:02:08,30 --> 00:02:13,360 then get this nice blue test fluid and fill it up to the little line right here, 29 00:02:13,360 --> 00:02:17,370 then you put the bulb on the top and create some suction, 30 00:02:17,370 --> 00:02:25,190 then you start the vehicle, and keep sucking to suck any air that's inside through the 31 00:02:25,190 --> 00:02:32,490 test material, and in this case you can see the blue fluid 32 00:02:32,490 --> 00:02:38,60 has turned yellow which means there's an exhaust gas leak and the head gasket at a minimum 33 00:02:38,60 --> 00:02:41,890 is blown, now I say at a minimum because of course if 34 00:02:41,890 --> 00:02:46,99 the head is warped or cracked or the block or the gasket is blown, it's going to let 35 00:02:46,99 --> 00:02:50,890 exhaust gas get into the cooling system, it could be any of those problems and their 36 00:02:50,890 --> 00:02:56,520 all expensive to fix on modern cars, now when I was a young mechanic in the 1960's 37 00:02:56,520 --> 00:03:00,599 we'd do head gasket jobs for maybe $200 bucks or something it wasn't that big of a deal, 38 00:03:00,599 --> 00:03:02,280 but today it can cost thousands on modern cars, 39 00:03:02,280 --> 00:03:07,760 and hope that your head is not warped or your block is warped, modern heads and blocks cost 40 00:03:07,760 --> 00:03:11,170 so much money it's really not worth fixing most cars, it's more than the value of the 41 00:03:11,170 --> 00:03:13,230 car, because they generally don't blow until the get older, 42 00:03:13,230 --> 00:03:17,230 now if you're really short on funds and your head gasket it starting to blow, there are 43 00:03:17,230 --> 00:03:23,879 various head gasket sealers out there, each of them have an advantage and a disadvantage, 44 00:03:23,879 --> 00:03:27,910 steel seal which I talked about years ago was the best one I ever found, 45 00:03:27,910 --> 00:03:32,629 but unfortunately that design really doesn't work with modern antifreeze, so you'd have 46 00:03:32,629 --> 00:03:36,570 to empty out all the coolant out, get it all out, run it with water, and then take the 47 00:03:36,570 --> 00:03:40,440 thermostat out, sometimes that stuff can last for quite some time but you can't mix it with 48 00:03:40,440 --> 00:03:44,850 modern antifreeze, now for modern cars with long life antifreeze, 49 00:03:44,850 --> 00:03:49,319 the best sealer that I found is the bars head gasket sealer, I get it at autozone it's $30 50 00:03:49,319 --> 00:03:54,930 and that is the best one if you want to try to put some sealer in to get a little bit 51 00:03:54,930 --> 00:03:57,909 more life out of it, but of course any sealer is just a big gamble, 52 00:03:57,909 --> 00:04:01,690 what you want is, not to have a blown head gasket in the first 53 00:04:01,690 --> 00:04:05,910 place, and to do that you want to keep clean antifreeze in your car, the old stuff you 54 00:04:05,910 --> 00:04:10,990 had to change every 3 years or 30,000 miles but some of the modern coolants go 7 years 55 00:04:10,990 --> 00:04:14,880 150,000 miles, you don't have to change it all that much but if you keep your car a long 56 00:04:14,880 --> 00:04:18,329 time change the coolant that keeps the head gasket from corroding, and of course the number 57 00:04:18,329 --> 00:04:23,490 one way to prevent a blown head gasket is never overheat your engine, as your car is 58 00:04:23,490 --> 00:04:26,770 running, the heat of the engine is taken away by the cooling system, 59 00:04:26,770 --> 00:04:29,250 if the cooling system fails, you got a leak or the water pump stops working, 60 00:04:29,250 --> 00:04:34,270 the heat builds up and modern engines have a lot of aluminum parts, aluminum will warp 61 00:04:34,270 --> 00:04:38,699 under very low temperatures, you can get an aluminum cylinder head, you 62 00:04:38,699 --> 00:04:42,220 can stick it in the oven in your house and then it can even warp even from that small 63 00:04:42,220 --> 00:04:45,220 amount of heat and it gets lot hotter inside the engine of a car, 64 00:04:45,220 --> 00:04:50,550 so you never want your engine to overheat and of course a lot of people think oil lubricates 65 00:04:50,550 --> 00:04:55,970 the engine, but engine oil also does a lot of cooling of a modern engine, 66 00:04:55,970 --> 00:05:00,250 so you want to have good clean oil too, because if you let the oil get too old and dirty, 67 00:05:00,250 --> 00:05:05,830 that can make an engine overheat and of course dirty oil has more friction and that can do 68 00:05:05,830 --> 00:05:11,710 damage do gaskets too by just the extra friction of dirt passing by the gasket and corroding 69 00:05:11,710 --> 00:05:14,750 it, and since this is mechanic monday, I giving 70 00:05:14,750 --> 00:05:18,580 away one of these leak block tests, all you got to do to have a chance to win is a place 71 00:05:18,580 --> 00:05:23,830 a clean non offensive comment on the YouTube comments below to get a nice block leak tester 72 00:05:23,830 --> 00:05:28,450 kit to see if your engine really is starting to blow a gasket, 73 00:05:28,450 --> 00:05:33,620 so if you never want to miss another one of my new car repair videos, remember to ring 74 00:05:33,620 --> 00:05:34,630 that bell!
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