DIY Leak Down Test on a Toyota Diesel 1HD-T 80 series Land Cruiser 

Compression Testing or Leak Down Testing, what's your favorite and why?

This was an excellent synopsis/diagnosis video. Very helpful and cheers from the USA.

Thank you for your help

Thanks for the video. I use this procedure as well on my 1HDT. I use the same gauge. Unfortunately I think I blew up the right gauge. Normally you should be able to 100psi on the left gauge and and the right gauge should go to 0. But I see on your gauge it is the same as on my gauge. 50psi left and right on 0. I personally think that this 50psi are not sufficient for diesel engines which have 500psi pressure. In my case I did a CO2 test which indicated a combustion leak into the radiator. The fluid turned yellow. I also have always a rising pressure in the coolant system. A compression test showed me a max difference of 1bar. All were from 31 to 32 bar. So I did a leak down test on all 6 cylinders but none of the cylinders leaked air in the coolant system . I replaced the right gauge with a common 140psi gauge and put 100psi in the combustion chamber. I didn't have significant leaks through rings, valves and I had not a single bubble coming up in the rad system. I do have to say that the engine was cold. I do see tiny little bubbles ( very tiny) in the rad cap while the engine runs for 5min and warms up. So i suspect it must be a tiny little crack somewhere in the head which only expands under heat. I will need to take off the head now and do a crack test with my DIY jig for that head. Hope that comes out negative and I just replace the head gasket and I am good again. I can still drive my 1hdt for 100km and the temp stays normal. I just have to release the pressure from the radiator every 100km...otherwise I might blow that. What are your thoughts?

Great stuff, thanks heaps for that info. I think both compression and leaks down tests were equally valuable. Was surprised though that it wasn't a leaking valve

Very good thanks

Great!

The compression test pretty much concludes the same thing do you think. If you started the vehcle with all the glows in etc and took the oil cap off there would have been enough blowby to tell you it's loosing air into there as well. My HZ is doing it with bad blowby and white smoke after AdBlue was ran through the tank. Wrecked injector pump and looks like engine too.

Great video. You mentioned that you connect to 100 psi and zero out your right gage. Your left gage it shows only around 30 psi. How is that possible? Your tester is calibrated for 30 psi? Thank you for your input.

thanks, for doing the leak test. Looking forward to the rebuild series now...lol... I feel the big fella's pain....lol..

As the oil down the bore, in the compression test video, didn’t show a significant change to the compression, I thought it pointed to a crook valve seat or something of that nature. Thanks to this video, I see that the leak down tester is a handy tool to stop amateurs like me from jumping to expensive conclusions. Thanks for posting. You’ve got a great channel.

When is the next episode keen to know what's happening when the heads off nice videos by the way keep it up 👍🏾

Super👌

i have that leak down set.. the hose and the quick release need to be changed. the quick release holds pressure.. the house just needs to be bigger

I found a cheap stethoscope is pretty handy for leak down testing as well.

I like it but I would love it...if I could save it to a playlist to find again later

Great at explaining it. I have a Kubota tractor. Before and after installing a brand new head, valves, injectors, my compression on all cylinders is zero except one which is 80. Pistons are good with no signs of damage. It ran great till I parked it for 2 weeks and now won't start or fire a lick. glow plugs get hot. No way I see to do a leak down test. Any thoughts.?

nice one mate. would you buy a better quality guage next time? what'd this one set you back?

Great video. I would like to know what tools your using. Please post Amazon links :)

I'd like to see a review on mattys bonnet strut 😂

Yes but how do you get an adapter to fit the small Yanmar engines. No glow plug and a clamp on injector into a tiny hole

Hey Simon, great video, thank you. Would I be correct that there will be an 80 Series rebuild video coming next? I guess you guys will be doing the majority of the work. I look forward to that. Cheers mate - and sorry Matty! I guess the actual cost of parts wont be so bad, even tho Mr Tojo loves to charge, but any machining will obv cost - it may not be so bad?

👍

Good video, my 1hdt has good compression and passed the leak down test yet the oil consumption is excessive. It's coming out of the breather of the crankcase. Some people suggested that the oil ring is not wiping the oil off the bore. Any thoughts?? Cheers mate

I know it is an old video but where did you get the adapter hose?

Are you doing a vid of pulling the head off?

Can you provide any info on the adapter pipe?

Hey mate, where did you get the glow plug adapter to suit the 1hdt? Cheers

Did u get the head off? Cant find a follow-up video

you selling those leak and compression test kit?

Does the 1HD-FTE have glow plugs?

Do you always test cold or is there a benefit doing a hot test?

So will there be a rebuild series now??

Was it a cracked piston? Turbod 1hz notorious for it!

No dislikes ❤️

How was the blowby on this engine?

Hopefully not a holed piston!

Big love to the broken man with a broken wallet.

710 hahahaha!!!

Never a good outcome...