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Author Topic: Need Ideas For Home Made Pressure Tester,  (Read 5461 times)

Offline Derrik

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Need Ideas For Home Made Pressure Tester,
« on: October 09, 2012, 03:08:13 pm »
I found a cool low psi gauge at a local welding shop for 11bucks,gout the brass fitting hook uo a hose for 7 bucks,and got 4 ft of about 3 bucks.
there was also a schrader valve and the t fitting i got for about 8 bucks so hopefully i can find a way to hook it up and fill my cases to check for leaks after my rebuild.

i cant find the right size freeze plug the cap off the exhaust and i need ideas for how you guys hooked up the pump and or what you used.


worst case senario im going to have to cut out a special block off plate that bolts up to the intake and exhaust.hopeing to find a cheap/easier way.

also ideas for a cheap/effective compression tester.ive read that the harbor freight stuff tend to be inaccurate,and cause the gauge hose is bigger on the harbor gauge its better suited for v8's and not small displacement motorcycle engines.
whats you opinion and experience with this?

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Offline Q2W

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Re: need ideas for homade pressure tester,
« Reply #1 on: October 09, 2012, 03:26:34 pm »
i used a patch of rubber and screwed my pipe flange on to seal the exhaust.

you can pick up a valve stem at lowes to hook a basketball/foot pump too.
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Offline Mitch Keller

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Re: need ideas for homade pressure tester,
« Reply #2 on: October 09, 2012, 04:07:57 pm »
Got the rubber plugs from Mcmaster carr http://www.mcmaster.com/#expansion-test-plugs/=jng2ls
Hole saw a metal or plastic plug at least 1/2" thick (my LT500 was 46mm or 1.812" 1- 13/16)")
Drill and tap Pipe Size 1/8", NPTF use a 1/8" fitting



Spark Plug Seals The Head

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Offline Derrik

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Re: Need Ideas For Home Made Pressure Tester,
« Reply #3 on: October 09, 2012, 09:30:56 pm »
that is dont nicely,guess i need to look up mc mastercarr!!
any one have an idea what freeze plug may work for a lt 250??

Offline Rogue1970

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Re: Need Ideas For Home Made Pressure Tester,
« Reply #4 on: October 10, 2012, 12:14:44 am »
Ok, so what exactly does the readings tell you?  Ring issues, crank sealing issues?

Nice DIY tester Mitch!

Offline MotorGeek - Jerry Hall

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Re: Need Ideas For Home Made Pressure Tester,
« Reply #5 on: October 10, 2012, 07:22:50 am »
Ok, so what exactly does the readings tell you?  Ring issues, crank sealing issues?

Nice DIY tester Mitch!

On engines that have power valves, it usually tells you that you need to figure out a way to keep the power valve from leaking air into the crankcase so that you get an accurate pressure and or vacuum test. :)


Once you solve the power valve sealing issue, a pressure test will help indicate leaking gaskets, cracks in the cases or cylinder and if the pressure lips on the crank seals are leaking.  IT WILL NOT REVEAL IF THE CRANK SEAL SUCTION LIP IS LEAKING.  Crank seals have two lips.  One lip holds pressure and the other suction.  The suction lip is the most important lip and the lip that is most apt to leak causing a lean condition at partial throttle.  A vacuum test is also necessary to accurately test for leaking crank seals.


Offline Dezsled

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Re: Need Ideas For Home Made Pressure Tester,
« Reply #6 on: October 10, 2012, 07:50:51 am »
Never seen the vacuum test procedure. I have a mighty vac, what's involved in the vacuum test?
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Offline Mitch Keller

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Re: Need Ideas For Home Made Pressure Tester,
« Reply #7 on: October 10, 2012, 08:54:09 am »
Dezsled, a hand held vacuum pump works well  also ( Brake Bleeder Pump) http://www.harborfreight.com/brake-bleeder-and-vacuum-pump-kit-69328.html
Now you know why I told you about double O ringing the power valve.
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Offline Dezsled

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Re: Need Ideas For Home Made Pressure Tester,
« Reply #8 on: October 10, 2012, 09:32:15 am »
Yeah Mitch I'll be doing that double oring trick for sure...

Great tip
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Offline Derrik

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Re: Need Ideas For Home Made Pressure Tester,
« Reply #9 on: October 12, 2012, 07:19:54 am »
double o-ring trick huh???
would you mind letting me in on this tidbit of info??

Offline Iceracer

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Re: Need Ideas For Home Made Pressure Tester,
« Reply #10 on: October 12, 2012, 01:08:35 pm »
lol.... this is tough one to explain let me see if I can ........ put two little green orings on powervalve shaft .........  between the bearing and pv under the limit plate.

Offline Deebo

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Re: Need Ideas For Home Made Pressure Tester,
« Reply #11 on: October 12, 2012, 01:25:06 pm »


Use (2) of the #8

Offline Derrik

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Re: Need Ideas For Home Made Pressure Tester,
« Reply #12 on: October 12, 2012, 08:51:00 pm »
interesting,the green o-rings you are referring to are the ones commonly used in a/c systems?

Offline GrkGuy

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Re: Need Ideas For Home Made Pressure Tester,
« Reply #13 on: December 20, 2012, 01:06:02 pm »
ok i cant ever remember how much air and how long does it have to hold air for.
life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sidays totally worn out shouting "HOLY SH*T...WHAT A RIDE!"

Offline Mitch Keller

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Re: Need Ideas For Home Made Pressure Tester,
« Reply #14 on: December 20, 2012, 01:11:21 pm »
interesting,the green o-rings you are referring to are the ones commonly used in a/c systems?
Just OEM O-Rings, using 2 O-Rings is added insurance of not having any leaks around the power valve is all.
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Offline Q2W

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Re: Need Ideas For Home Made Pressure Tester,
« Reply #15 on: December 20, 2012, 01:12:57 pm »
5lbs

and if you still have 5lbs after 10 mins you're good.

Offline GrkGuy

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Re: Need Ideas For Home Made Pressure Tester,
« Reply #16 on: December 20, 2012, 01:33:19 pm »
ok thanks, i just found it again

4lbs for 4 to 5 min, and you can lose 1/2lb in that time and it still ok.

does this sound right.

and who has the o-rings for sale. beside mmcar
life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sidays totally worn out shouting "HOLY SH*T...WHAT A RIDE!"

Offline Deebo

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Re: Need Ideas For Home Made Pressure Tester,
« Reply #17 on: December 20, 2012, 02:06:09 pm »
Suzuki. I think I have some extras.

Offline GrkGuy

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Re: Need Ideas For Home Made Pressure Tester,
« Reply #18 on: December 20, 2012, 02:11:24 pm »
cool lmk Matt, and what do you have to do pull that bearing out of the power valve, is it behind it.
i just took mine apart and i didnt see it.
life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sidays totally worn out shouting "HOLY SH*T...WHAT A RIDE!"

Offline Deebo

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Re: Need Ideas For Home Made Pressure Tester,
« Reply #19 on: December 20, 2012, 02:57:03 pm »
Did it come on on the valve? If not, should be easily visible

Offline GrkGuy

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Re: Need Ideas For Home Made Pressure Tester,
« Reply #20 on: December 20, 2012, 03:00:35 pm »
yeah i didnt see it, i really cant see it being behind that bearing tho
life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sidays totally worn out shouting "HOLY SH*T...WHAT A RIDE!"

Offline Q2W

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Re: Need Ideas For Home Made Pressure Tester,
« Reply #21 on: December 20, 2012, 03:43:02 pm »
ok thanks, i just found it again

4lbs for 4 to 5 min, and you can lose 1/2lb in that time and it still ok.

does this sound right.

and who has the o-rings for sale. beside mmcar

Personally, i'd never run a bike that has any kind of an air leak.

Offline Mitch Keller

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Re: Need Ideas For Home Made Pressure Tester,
« Reply #22 on: December 20, 2012, 03:52:04 pm »
Here is a pic with the 2 O Rings, almost room for a 3rd one


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Offline Derrik

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Re: Need Ideas For Home Made Pressure Tester,
« Reply #23 on: December 20, 2012, 05:30:30 pm »
AWESOME!!! im still waiting on finances to get mine together -_-
thanks for the info!!! this shit is priceless!!!errr well THIS SHIT SAVES ME MONEY!! lol

Offline Deebo

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Re: Need Ideas For Home Made Pressure Tester,
« Reply #24 on: December 20, 2012, 05:35:14 pm »
JH, what Do you do to prevent the exhaust valve from leaking? Recommendations on how long a motor should hold air pressure?

 

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