Smoke testing a compression leak

[gilzapopan]

how did you create smoke and add it to the cyllinder?

[christheblack1]

Excellent!!! I would have never thought of doing that.

[ArcticEditing]

Smart, very smart!

[jayfbee]

brilliant

[intergrale4x4]

I know this is a really old video but just to confirm to anyone "When the piston is at TDC both valves will be closed" which ever stroke the piston was on. Unless of course the drive belt or chain has broken !!!!

[killer2600]

@intergrale4x4 Not necessarily, depending on engine design there can be valve overlap where intake and exhaust valves are both open at the transition from exhaust to intake stroke. Being on the compression stroke is the only way to be sure both valves are closed fully at TDC.

[texturedmuffin]

Smart people, good effort. Please keep updating your knowledge, and continue your work.

[blazinloud]

damn good video. you make some of the best. subscribed!

[chejo524]

I am a back yard mechanic I no that for real but this machine is grate my boss he has one I will star my investigation how to use

[shackwrrr]

How do you like working on those LLV's? Is it nice to work with the post office?

[MrAirshot]

1:40 i think i found the big foot

[mrexecutive1]

Dear Duane,

This may be a silly question but would it be ok to rig a fog machine to smoke an engine? since smoke machines cost is in the thousands, and wouldnt be used much for the at home diy'er?

[bd1015]

i have been thinking of doing the same thing. Fog machines are propylene glycol based for the fogging liquid. Opinions anyone?

[AcheLone]

if smoke coming from the tail pipe it is exhaust valve. if its coming from throttle body its intake valve. How to check for piston ring, no smoke coming from either of these? TQ

Great video. Now i understand better about car engine :D

[pimpfoot]

@AcheLone

For a piston ring leak. Look for smoke comming from the crankcase (dipstick tube, @ oil cap, PCV hole)

[AcheLone]

@pimpfoot tq sir

[G3kRay]

i really like relative compression method so i dont have to back track and call the customer again to say they need much more serious work to fix the problem

[ncautoman57]

I always used low pressure compressed air directly into the clyinder with the piston at the top . It does the same thing and don't have to purchase a smoke machine. You can hear where the air is escaping quite easily.

[serchmarc]

thx for the tip ,watch my video i have a vac prob,but i dont have that smoke machine could i use a air compressor?and soap

[JDMGTP]

what ended up being the problem? A flattened lobe? A stuck valve? Maybe just a bad valve seat?

[eastsidahboy]

very good diagnosing but took time to do those methods lost money already..

[pimpfoot]

How did you know the piston was at TDC on the compression stroke and not the exhaust stroke?

[realfixesrealfast]

Good question. #1 had good compression, so we rotated #1 until we got air moving out the tube, identifing it as being on compression stroke. Then we went to #3 which was next in the firing order and knew that it should be on compression stroke on it's next time it went to the top. There are other ways we could have used but this was the simplest since we were right there at the plugs and had them all out anyway. Hope this helps.

[pimpfoot]

Thanks for the reply. Enjoy your videos and website. I woluld like to work for a shop like yours. Your no ESO.

[devilslice]

that is not going to be a fun fix.