How to do a Cylinder Compression Test

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Compression test tool here: www.amazon.com/gp/product/B00...
This video shows how to perform a cylinder compression test. Virtually the same process on all gasoline vehicles. If you get bad results, you could have an issue with piston rings, a hole in the piston, or valve sealing issues just to name a few.

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Опубликовано:

13 окт 2017

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Комментарии : 29

@traxs4299 5 лет назад

for a smaller channel and a year old video, this is an extremely in-depth and great tutorial. 10/10

@dannyjohnsonsgarage 5 лет назад

Traxs Thank’s. I have a pretty good collection with over 500 videos. Feel free to subscribe and check them out. I have pulling the drivetrain on a terminator, gear installs, clutch installs, transmission swaps, fuel pump videos etc It’s starting to pick up and average over 200,000 views per month. Thanks for taking the time to watch 🙂

@alexarce8887 3 года назад

Thanks, you answered a lot of questions I had....

@justin.c_svt 6 лет назад

Great vid

@charleswilson4598 5 лет назад

The torque for spark plugs on normal engines is light as you say, just a little more than hand tight. But some of these Ford 4.6L and 5.4L engines had a nasty habit of blowing plugs out of the head. I have read all I could on Ford forums and you tube about this problem. There are some good Ford mechanics who say to tighten spark plugs in these engines tighter than normal because of the few threads in these heads. I believe them and I always torque my plugs in these engines to 20+ ft lbs, and it has never been a problem getting them back out.

@dannyjohnsonsgarage 5 лет назад

Yeah, you are correct. It’s primarily a problem on heads with only 4 threads, so I check my mach 1 at very oil change. luckily my cobra has the 9 thread heads, so less common but can still happen. Great advice

@poot111111 6 лет назад

Sweet ass intake manifold! I have the elderbrock Jr. FI, what is yours? And does that have a larger cam installed? I know the 4.6 is an interference engine if the cam timing chain slipped it might damage all the heads on that side, just some ideas.

@dannyjohnsonsgarage 6 лет назад

poot111111 this one is Richard racing. I highly doubt the chain slipped, but rather the valve clearance on this engine build was too tight with the cam when the engine was rebuilt

@poot111111 6 лет назад

ohh that makes since. I didn't know the engine was rebuilt. That sucks to have a fresh motor with a dead hole! Keep up the good work! I will be watching, you will be the next Chris Fix for Ford guys

@dannyjohnsonsgarage 6 лет назад

poot111111 ha ha, thanks man. Chris fix is great

@bkboss92 4 года назад

Hey I have a 2002 mustang GT and we were trying to do a compression test but we were not able to get the 14mm size to screw into the threads I was wondering if there was a special size for this year

@dannyjohnsonsgarage 4 года назад

There are usually adapters for the compression kit

@jakecarlton1135 3 года назад

Had the same problem get a different compression kit some adapters are too short even tho they are 14mm

@charlesdixon1804 Год назад

On the compression test will it tell you that you could have a been oil ring? How to tell the difference between valve seal are bad when there blue smoke at acceleration or oil is get past a ring ?

@dannyjohnsonsgarage Год назад

You’ll want to do a leak down test to confirm if it’s the valves. A compression test could be bad from piston rings or valve seals

@edwinortiz6583 3 года назад

Quick question and might be dumb but I wanna do this on my 01 cobra, I’ll do everything you did but the 01 cobra has the intake in the way. Would having the intake off for the compression test matter?

@edwinortiz6583 3 года назад

Another question do you have to take off each coil and spark plugs at a time and then put it back after you test it? I seen another video just now and this guy had taken off all the spark plugs and tested it.

@dannyjohnsonsgarage 3 года назад

@@edwinortiz6583 The intake on or off will not effect the test. It’s also easier on the starter if all the plugs are removed so the engine spins more freely- it will just make more strange noises. That will not effect the results either because the test is for each individual cylinder and none are connected to eachother

@edwinortiz6583 3 года назад

@@dannyjohnsonsgarage ahhh got it, Thank you very much!

@MoreFunRiddles Год назад

What were the symptoms that lead to a compression test? Was the car ever repaired? Thanks!

@dannyjohnsonsgarage Год назад

Mainly the smoke show under full throttle of oil burning (you saw how much oil it was spitting out in the beginning of the video). To my knowledge, even after showing the owner the compression results, they deny it and the car is still for sale

@kyleendlekofer7601 2 года назад

Can u pull all the plugs then test each cylinder? And do u have to completely unplug the coil? I have an 2003 cobra

@dannyjohnsonsgarage 2 года назад

Yes, it’s much easier on the starter to remove all the plugs so there is only compression on the cylinder in use. We did that on an 03 cobra once ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ZrtzOCheUkw.html