Leakdown Test Question
07-31-2004, 05:50 PM
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Re: Leakdown Test Question (vtec69)
ok say if i took out all the spark plugs should any air be coming out of the other spark plug holes. I dont think it should just trying to determine if i have a bad headgasket or somthing
07-31-2004, 05:54 PM
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Re: Leakdown Test Question (IH82LOSE)
i dont think there should be any air coming out of any of the other holes but from my experience Ive always only taken one out at a time and even the shop that i go to they do the same
07-31-2004, 06:45 PM
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first set the leak down tester.
put #1 at top dead center
take plug out and do a leakdown
then do number 3, 4, 2-- make sure each cylinder is at top dead center before you do a leakdown.
put #1 at top dead center
take plug out and do a leakdown
then do number 3, 4, 2-- make sure each cylinder is at top dead center before you do a leakdown.
07-31-2004, 07:19 PM
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Re: Leakdown Test Question (IH82LOSE)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by IH82LOSE »</TD></TR><TR><TD CLASS="quote">ok say if i took out all the spark plugs should any air be coming out of the other spark plug holes. I dont think it should just trying to determine if i have a bad headgasket or somthing</TD></TR></TABLE>
if that's what you're doing it for, there's no need to take off all the spark plugs at the same time. just pop off the radiator cap and look for bubbles coming out of the radiator.
if that's what you're doing it for, there's no need to take off all the spark plugs at the same time. just pop off the radiator cap and look for bubbles coming out of the radiator.
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07-31-2004, 07:49 PM
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Re: Leakdown Test Question (taz77)
the reason he is doing it is because one of the cyl has a low compression number and we are trying to figure out whats going on.
he took out all the spark plugs and then did the leak down test. air came out of the spark plugs holes when doing the test.
he's wondering, should air come out of the spark plug holes when testing one cyl? shouldn't the head being bolted down prevent air from going into the other cyl when doing the leak down test?
you see what i'm saying?
he took out all the spark plugs and then did the leak down test. air came out of the spark plugs holes when doing the test.
he's wondering, should air come out of the spark plug holes when testing one cyl? shouldn't the head being bolted down prevent air from going into the other cyl when doing the leak down test?
you see what i'm saying?
08-01-2004, 10:45 AM
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Re: Leakdown Test Question (IH82LOSE)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by IH82LOSE »</TD></TR><TR><TD CLASS="quote">ok say if i took out all the spark plugs should any air be coming out of the other spark plug holes.</TD></TR></TABLE>
No
No
08-01-2004, 11:29 AM
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Re: Leakdown Test Question (TECH43 RACING INC.)
Thats how i did the leakdown test by removing all of the plugs. Now what happen when i did that air was coming out of the other spark plug holes. My question is is that suppose to happen. thanks
08-01-2004, 12:21 PM
#15
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Re: Leakdown Test Question (IH82LOSE)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by IH82LOSE »</TD></TR><TR><TD CLASS="quote">Thats how i did the leakdown test by removing all of the plugs. Now what happen when i did that air was coming out of the other spark plug holes. My question is is that suppose to happen. thanks</TD></TR></TABLE>
No, if your doing the leakdown test right, that means there is a leak. Valve or headgasket.
No, if your doing the leakdown test right, that means there is a leak. Valve or headgasket.
08-01-2004, 12:37 PM
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Re: Leakdown Test Question (Chiovnidca)
I would think no air should be leaking out of the other spark plugs right. So a bad headgasket or bad valves will leak air threw the other spark plugs right. Well i took the head off gonna have the valves check to see if any are bad if not i guess i had a bad headgasket then.
Another question to anyone that knows when i had the piston at top dead center in order to know whether i had a bad valve should any air come out of the exhaust or intake. Lots of air was coming out of cyl 1-3 except for cyl four it held 100 plus psi of air with no leakage. thanks
Another question to anyone that knows when i had the piston at top dead center in order to know whether i had a bad valve should any air come out of the exhaust or intake. Lots of air was coming out of cyl 1-3 except for cyl four it held 100 plus psi of air with no leakage. thanks
08-01-2004, 01:39 PM
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Re: Leakdown Test Question (IH82LOSE)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by IH82LOSE »</TD></TR><TR><TD CLASS="quote"> Lots of air was coming out of cyl 1-3 except for cyl four it held 100 plus psi of air with no leakage. thanks</TD></TR></TABLE>
You put each cylinder you were testing to TDC on the compression stroke right?
You put each cylinder you were testing to TDC on the compression stroke right?
08-01-2004, 03:37 PM
#19
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Re: Leakdown Test Question (IH82LOSE)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by IH82LOSE »</TD></TR><TR><TD CLASS="quote">yes thats how i perform the test in each cylinder piston set to the highest point</TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chiovnidca »</TD></TR><TR><TD CLASS="quote">
on the compression stroke right?</TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chiovnidca »</TD></TR><TR><TD CLASS="quote">
on the compression stroke right?</TD></TR></TABLE>
08-01-2004, 03:48 PM
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Re: Leakdown Test Question (3 3 3)
so no air should be leaking out of the other spark plug holes. all the air should stay in each cylinder right the air should not be leaking to the other cyl. So say i put the compress air in cyl 1 no air should be coming out of the other cyl 2,3,4 right
08-01-2004, 05:30 PM
#22
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Re: Leakdown Test Question (IH82LOSE)
you SHOULD remove all spark plugs. if you dont and you have a leak between cylinders it will give false readings.
leakdown and compression tests have this same procedure.
leakdown and compression tests have this same procedure.
08-01-2004, 08:14 PM
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Re: Leakdown Test Question (Kamin)
you take one plug out at a time when doing a compression test.
when doing a leakdown test, how would air come out of the other cyl when your just putting air in one cyl? shouldn't the head being bolted down prevent that from happening? i would think air wouldn't be able to get from one cyl to the next unless the headgasket is worn or something.
when doing a leakdown test, how would air come out of the other cyl when your just putting air in one cyl? shouldn't the head being bolted down prevent that from happening? i would think air wouldn't be able to get from one cyl to the next unless the headgasket is worn or something.
08-01-2004, 08:16 PM
#24
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Re: Leakdown Test Question (hondaeg8)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hondaeg8 »</TD></TR><TR><TD CLASS="quote">you take one plug out at a time when doing a compression test.
when doing a leakdown test, how would air come out of the other cyl when your just putting air in one cyl? shouldn't the head being bolted down prevent that from happening? i would think air wouldn't be able to get from one cyl to the next unless the headgasket is worn or something. </TD></TR></TABLE>
no you dont! you remove ALL PLUGS, if you have a cross cylinder leak it can give a false compression reading!
the air comes out the other cylinder if you have a blown headgasket.
when doing a leakdown test, how would air come out of the other cyl when your just putting air in one cyl? shouldn't the head being bolted down prevent that from happening? i would think air wouldn't be able to get from one cyl to the next unless the headgasket is worn or something. </TD></TR></TABLE>
no you dont! you remove ALL PLUGS, if you have a cross cylinder leak it can give a false compression reading!
the air comes out the other cylinder if you have a blown headgasket.
08-01-2004, 08:21 PM
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Re: Leakdown Test Question (Kamin)
according to the c-speedracing directions...i believe you take one plug out at a time.
so since this guy has air coming out of all cyl when spraying air in one cyl, the headgasket is blown?
so since this guy has air coming out of all cyl when spraying air in one cyl, the headgasket is blown?