MrSafety
Newbie at Heart
- Joined
- Jun 27, 2010
- TDI
- 2002 Jetta TDI/ALH/01M-'80 240D Mercedes/'81 Rabbit "Caddy"/'99 Lexus ES300
I have a problem leak from around the Oil-Fill Cap !
I have changed the cap at least 3 times and the latest one was new!
So I figure that the crankcase pressure is somehow building up too much either:
(a) because we have an engine that has too much "blow-by"… OR
(b) there are 1 or more restrictions in either the "Hockey Puck-Like"
....... filter that sits on the valve cover … OR
(c) a restriction in the "Breather Hose" that runs between the “Puck" and
....... its connection to the "Intake Air Tube" just before it turns down
....... behind the engine on it's way to the turbocharger… OR
(d) there is too little suction (in general or at certain times) from the turbo ....... charger
My Bentley printed manual calls this the Positive Crankcase Ventilation (PCV) system...
but I also see on this FORUM where many call this the "CCV" system which I presume is short for
"CrankCaseVentilation" system!
I have:
(1) verified that the "Hockey-Puck" filter/separator is not restricted...
(2) verified the “Breather Hose” and it’s connection to the “Intake Air Tube”
..... are not restricted…
(3) there is observable suction of air into the “Breather Hose” when the
..... engine throttle is increased
(4) verified the presence of a 2-wire electrical component at the connection
..... of the “Breather Hose” to the “Intake Air Tube”… and that this appears to
..... be a heater as explained in the Bentley Service Manual.
(5) verified that with the Oil-Fill Cap in place, the crankcase is pretty much
..... air tight when I try to blow air in through the hole in the valve cover that
..... the PCV/CCV “Hock-Puck” draws oil mist and vapors.
I am aware of what is known on this FORUM as the “CCV Mod” whereby an alternative
Oil Mist Separator/Filter is installed on the engine as a means to reduce the buildup of oil residue
on the walls of the intake manifold… but our engine has no such system installed.
Today I replaced the “Hockey-Puck” Filter-Separator in a somewhat desperate attempt to solve this mystery!
Q1 – What is the purpose of the “heater” installed at the connection of the “Breather Hose” to the
....... “Intake Air Tube”?
Q2 – In response to (5) above, should there be an air inlet opening to the
...... crankcase somewhere so that more air is Freely drawn through by the
...... turbo charger’s suction on the Intake Air Tube”?
Q3 – Is it possible that somehow there is a partial loss of turbo suction
....... under certain conditions and this results in insufficient suction and thus
....... the pressure builds up in the crankcase?
Q4 - How does one test to see IF excessive "blow-by" is happening...
...... a compression test?
Q5 - Does anyone have a suggestion as to what I look into next?
Any help will be most appreciated!
Sam Ross
I have changed the cap at least 3 times and the latest one was new!
So I figure that the crankcase pressure is somehow building up too much either:
(a) because we have an engine that has too much "blow-by"… OR
(b) there are 1 or more restrictions in either the "Hockey Puck-Like"
....... filter that sits on the valve cover … OR
(c) a restriction in the "Breather Hose" that runs between the “Puck" and
....... its connection to the "Intake Air Tube" just before it turns down
....... behind the engine on it's way to the turbocharger… OR
(d) there is too little suction (in general or at certain times) from the turbo ....... charger
My Bentley printed manual calls this the Positive Crankcase Ventilation (PCV) system...
but I also see on this FORUM where many call this the "CCV" system which I presume is short for
"CrankCaseVentilation" system!
I have:
(1) verified that the "Hockey-Puck" filter/separator is not restricted...
(2) verified the “Breather Hose” and it’s connection to the “Intake Air Tube”
..... are not restricted…
(3) there is observable suction of air into the “Breather Hose” when the
..... engine throttle is increased
(4) verified the presence of a 2-wire electrical component at the connection
..... of the “Breather Hose” to the “Intake Air Tube”… and that this appears to
..... be a heater as explained in the Bentley Service Manual.
(5) verified that with the Oil-Fill Cap in place, the crankcase is pretty much
..... air tight when I try to blow air in through the hole in the valve cover that
..... the PCV/CCV “Hock-Puck” draws oil mist and vapors.
I am aware of what is known on this FORUM as the “CCV Mod” whereby an alternative
Oil Mist Separator/Filter is installed on the engine as a means to reduce the buildup of oil residue
on the walls of the intake manifold… but our engine has no such system installed.
Today I replaced the “Hockey-Puck” Filter-Separator in a somewhat desperate attempt to solve this mystery!
Q1 – What is the purpose of the “heater” installed at the connection of the “Breather Hose” to the
....... “Intake Air Tube”?
Q2 – In response to (5) above, should there be an air inlet opening to the
...... crankcase somewhere so that more air is Freely drawn through by the
...... turbo charger’s suction on the Intake Air Tube”?
Q3 – Is it possible that somehow there is a partial loss of turbo suction
....... under certain conditions and this results in insufficient suction and thus
....... the pressure builds up in the crankcase?
Q4 - How does one test to see IF excessive "blow-by" is happening...
...... a compression test?
Q5 - Does anyone have a suggestion as to what I look into next?
Any help will be most appreciated!
Sam Ross