--Please Read-- :)
Some of the best advice I can offer you about fixing your car is to search for an online forum related to your car, or even for your specific engine. If you have a popular car or engine, this can be an amazing tool in diagnosing and fixing cars yourself!
1. Get kerosene, gasoline, or break cleaner.
2. Tilt head on its side, with the ports of the valves you're testing pointing up and exposed.
3. Fill the intake or Exhaust ports with the liquid you chose, make sure to use enough liquid to cover the back of the valve head completely inside the port.
4. Look at the valve surface in the combustion chamber for leakage. (Let it sit for several minutes)
5. If there is a leak, you could have a bent valve or just a bad seal of the valve to the head. You might have to replace the valve, or just use some lapping compound to lap the valve/seat to resurface.
6. Repeat for the other side if you wish.
7. This is a great time to replace valve seals if you have noticed they are worn too much.
8. If you have any questions, please post them here and I'll try to answer them quickly.
You just tilt the head on one side or the other depending whether you want to test the intake or Exhaust valves. I'm testing the intake valves in this video. I did this way because I didn't have the leakdown test equipment, but also because I wanted to replace my head gasket anyway. I wouldn't say this is the best way to test initially if you suspect leaking or bent valves because it requires you remove the head. Try just a regular leakdown test first. But if you're taking it off anyway it's pretty nifty and doesn't require the leakdown test tools. There are several methods to do this, this is just the one I chose in my situation.
EASY, HOW I LAPP & GRIND VALVES. THEY DONT TEACH THIS TRICK IN SCHOOL, ONLY OLDSKOOL.
Automotive technician since 1991 I show how I do a valve grinding job
(Lapping Valves) at home using a vacuum hose, drill & compound, don't over
think it and don't assume it cant be done. learn how and save money on your
project with out taking your cylinder head to the machine shop. Valve
guides must be in good shape ( with no significant play or bent Valves
before you perform this task, but this procedure works very well if done
with care & quality. Go get it! and God bless.
Cylinder Head 105 - Valve Job Basics
Valves not sealing? Valves not bent? This is how you fix that problem.
In this video I outline the basic valve job procedure. Cleaning the
valves, cleaning the seats, cleaning the combustion chamber and lapping the
valves in to make a better seal.
Here I cover the process start-to-finish. It's the same exact process for
pretty much all non-rotary combustion engines. It takes patience and
perseverance to do this job, but anyone can do it. Reference your service
manual for measurements and service limits. Everything else that's not in
your service manual is in this video.
I apologize for not having broken busted crap to work with in this video.
It's more beneficial to all of you when bad fortune falls on me because it
gets well documented, and many people watching these videos are looking for
answers. If you have bent valves, you will discover it quickly once you
chuck one up in the drill. You'll see the face of the valve wobble around
while it spins. You'll see evidence of this damage on the valve seat. If
it's bad, you may see damage on the valve guides in the form of cracks or
missing pieces where the valve guides protrude through the head ports.
Give all that stuff a good visual inspection. ...and if you doubt yourself,
never hesitate to get a second opinion or consult a machine shop. They
will have access to expensive tools that you wont find in your average
Cylinder Head 201 - Radius Cut Valve Job
This video covers the complete valve job process that your machinist might
perform. If the 100 series videos didn't help you identify and correct a
problem with your cylinder head, then this is the next step. This video is
brought to you with permission from my machinist in full 1080HD, and covers
cleaning up the head inside and out, preparation and setting up a radius
cutter, cutting all 16 valve seats, valve grinding, and spans 3.5 hours of
actual work in under 30 minutes. There's nothing like this anywhere else
THANK YOU BALLOS PRECISION MACHINE. Thank you for the professional
explanation and execution of a job excellently-done, and un-precedented
access to your facilities.
A valve job is done by re-grinding or replacing valves, and then having new
seats cut to match the faces of the valves you're using. There are several
different machines that might be utilized to achieve this result, but the
process is the same no matter how it's done. There are seat cutters that
utilize cutting stones. There are valve seat cutters with 3 separate
angles installed 120° out-of-phase, and there are single cutters with all
3 angles (radius cutter) that cut with one blade in one pass. The machine
demonstrated here is a Sunnen VGS-20 Radius Cutter. This machine (now out
of production) produces a gradual curved seat that's superior to the shape
of a traditional 3-angle seat. While a radius cutter does contain the 30,
45 and 60 degree angles, it does so without leaving any sharp edges between
My valve selection includes Supertech 1mm oversized nitride-coated
stainless steel undercut and back-cut intake valves, and 1mm oversized
Inconel back-cut Exhaust valves.
Inconel is a high-temperature alloy utilized in marine and forced-induction
performance engines that can handle more abuse than steel can without
melting. The other characteristics of the valves which are discussed
typically yield bigger gains in airflow than simply using a bigger hole and
a bigger valve.
Why I did this to a perfectly-good cylinder head:
I changed cams. Because the valves were previously recessed during another
valve job 9 years ago, my valve installed height was increased and this
raised the operating positions of my rocker arms. My new camshaft
selection dictates using the stock valve install height. The only
solutions to this valve install height problem are to either replace the
valve seats, or install oversized valves. I opted for the latter.
cylinder leak test how to check for bent valves
i did this video to help some of you not get ripped off when buying a
i will be doing many videos of how to test parts and what to look for.
please email me if you have question or what to learn how to test something
else firstname.lastname@example.org or email@example.com
How to Reseat / Lap Valves (Basic Valve Job)
In this video i'm explaining how to reseat or lap valves in a flathead or
overhead valve engine. Also can be called a valve job, but this is not a
complete valve job. I also used to much valve grinding compound, it does
not require a whole lot. Usually when a engine needs this done is when a
engine has low compression that is found to be leaking around the valves,
or sometimes a engine will backfire do to the valves not closing
completely/properly. Thanks for watching.
Cylinder Head 102 - Hydro Test Valves
If you noticed a drop in compression on one cylinder, and pouring a cap of
oil through the spark plug holes didn't fix it, then it's likely you
experienced a leaky valve or a burnt valve seat. What this test does is
show you where it was leaking. Typically it takes a valve job to repair,
but this can also occur on a freshly-machined head if any work was done
improperly or out-of-center.
I'm using tap water for the test because both cylinder heads I'm testing
will receive extensive machine work and cleaning before being re-used. If
you were to do this test on a freshly-machined head, you'd want to use
deionized water as it contains none of the salts (sodium, chlorine, etc...)
that would leave deposits and corrode metal parts.
How To Perform a Compression Test - EricTheCarGuy
Compression Testing and What You Can Learn From It - EricTheCarGuy
Here is a video on performing a compression test on an engine to assess
it's mechanical condition. An engines ability to compress air and fuel is
directly proportional to it's performance since an engine is nothing more
than an air compressor once you take away all the controls. A compression
test is a good general test that will give you an idea of the engine's
overall health but it does not give specific information on what the
problem is should there be one, for that a "leak down test" would be
required, here is a link to that video.
However if you find yourself looking for the source of a performance
problem with an engine, this is a great place to start. This test is often
overlooked in favor of looking at the fuel or ignition system, I think
that's a mistake, if an engine can't perform mechanically no amount of
electronics will make that better.
Recently, I hit the 500 subscriber mark and I'd like to thank all of my
subscribers past, present, and hopefully in the future for that. I enjoy
making these videos and the fact that you seem to like watching them means
a lot to me. So, thanks for subscribing, rating, and commenting, those
little contributions make it all worth while.
Click below and Stay Dirty
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Also see the video I did, "Octane Ratings and the 4 Stroke Engine Cycle"
for more information on how compression works and why it is important.
Thanks for watching and stay dirty
Due to factors beyond the control of EricTheCarGuy, it cannot guarantee
against unauthorized modifications of this information, or improper use of
this information. EricTheCarGuy assumes no liability for property damage
or injury incurred as a result of any of the information contained in this
video. EricTheCarGuy recommends safe practices when working with power
tools, automotive lifts, lifting tools, jack stands, electrical equipment,
blunt instruments, chemicals, lubricants, or any other tools or equipment
seen or implied in this video. Due to factors beyond the control of
EricTheCarGuy, no information contained in this video shall create any
express or implied warranty or guarantee of any particular result. Any
injury, damage or loss that may result from improper use of these tools,
equipment, or the information contained in this video is the sole
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Cylinder Head 104 - Remove Valves & Springs
Just one of many ways to remove valves from a cylinder head. I haven't
seen a valve compressor like this one on YouTube yet. I know it's nobody
makes them like this, because this one is a custom hack job specifically
for 4g63 heads... but it's extremely effective and easy to use.
Since I don't own a valve grinder, valve spring pressure testers (for
installed height measurement), or valve seat grinding stones... there are
several services I'm unable to perform myself. But since I can get the
head disassembled to this state, it would be easier and cheaper for me to
have them serviced by someone who does.
Valve grinding machine time is cheaper if they don't have to tear down the
head. You can lap them in yourself, but if the seat's in really bad shape,
it will require attention to allow any of those efforts to be worthwhile.
Valve seat grinding if necessary needs to be done with the proper tools,
and if the seats must be replaced, then it can get expensive. Usually
$20-ish a hole. Sometimes an oversized bore can be cut into a factory
seat. I'm ordering a set of valves to see if that's possible.
CHECKING LEAKING VALVES EASY W/ AIR & BUBBLES THEY DONT TEACH THIS IN SCHOOL, ONLY OLDSKOOL
AUTOMOTIVE TECHNICIAN SINCE 1991 I SHOW MY METHOD FOR CHECKING VALVE AND
VALVE SEATING (OTHER THAN THE CYLINDER LEAK DOWN TEST WHILE THE HEAD IS ON
THE CAR) FOR ANY LEAKAGE WHILE THE CYLINDER HEAD IS OFF THE VEHICLE SO YOU
DON'T HAVE TO GUESS IF WHETHER OR NOT YOU NEED TO GRIND THE VALVES. BUT IF
YOU GO THROUGH ALL THE HARD WORK OF PULLING OFF THE HEAD THEN YOU MIGHT AS
WELL GRIND ALL THE VALVES AND SEATS. THIS IS JUST SHOWING YOU PROOF THAT
YOU CAN STILL CHECK FOR LEAKAGE WHILE THE HEAD IS OFF THE ENGINE BLOCK BY
SIMPLY USING WATER AND AIR. KEEP IN MIND PITTED SEATS, BENT VALVES, WARPED
HEAD, BAD VALVE GUIDES AND A FEW OTHER FACTORS CAN ALSO CONTRIBUTE TO A
LEAKING VALVE & SEAT. IF YOU DO NOT HAVE AN AIR COMPRESSOR THEN TRY
COMPRESSED AIR IN A CAN USED FOR CLEANING COMPUTERS (THEY SELL THEM AT
WALMART) BUT MAKE SURE YOU USE A LONG STICK NOZZLE TO APPLY AIR RIGHT
BEHIND THE SEAT EDGES JUST LIKE I DO IN THE VIDEO. GO GET IT! STAY STRONG
AND NEVER LET ANYTHING OR ANYONE CRUSH YOUR FAITH IN JESUS CHRIST OR YOUR
WILL TO WIN!