Re: HELP.....removing PCV fittings on a 1995 Grand Cherokee Limited
 

Roughly 5/2/04 17:27, TJM's monkeys randomly typed:

>> Them holes are round, the old one has to be pried out. It likely will
>> not survive the removal.
>
> Yep, that photo describes exactly what I am trying to do, but why do the
> grommets require such a difficult removal? My shop manual says the PCV
> orifice tubes should be inspected every 30K miles.....so I am expected to
> buy new ones every 30K because they cant be removed without breakage? Gotta
> be a better way, right? :)
>
>
You could probably find an online rubber grommet repository and buy
ones that don't harden with age. Or you could just pry out the
current ones and replace them with new ones. Like most engine
rubber components, they need periodic replacement or you get lots
of easily avoidable blowby...

--
Evolution is merely survival of the minimally adequate

Re: HELP.....removing PCV fittings on a 1995 Grand Cherokee Limited
 

> They are rubber, and if you really have to break them to get them out,
> by definition, they need replacing. The material hardens with heat
> and age. The new ones can be installed without breaking them. The
> idea is that the harder rubber compound does a better job of holding
> the air intake [front hose] and CCV fixed orifice [rear hose] in
> place.

OK, now I understand. I also see why Jeep recommends checking them every
30K miles.

BTW, are there any serious consequences if the crankcase ventilation has
been clogged for months? I havent noticed any significant idle problems,
but I have no idea how long the system has been plugged up. If the PCV
valve becomes clogged, the blow-by gases and oil will just exit through the
intake hose, right?

Thanks again for the help.....

Re: HELP.....removing PCV fittings on a 1995 Grand Cherokee Limited
 

> They are rubber, and if you really have to break them to get them out,
> by definition, they need replacing. The material hardens with heat
> and age. The new ones can be installed without breaking them. The
> idea is that the harder rubber compound does a better job of holding
> the air intake [front hose] and CCV fixed orifice [rear hose] in
> place.

OK, now I understand. I also see why Jeep recommends checking them every
30K miles.

BTW, are there any serious consequences if the crankcase ventilation has
been clogged for months? I havent noticed any significant idle problems,
but I have no idea how long the system has been plugged up. If the PCV
valve becomes clogged, the blow-by gases and oil will just exit through the
intake hose, right?

Thanks again for the help.....

Re: HELP.....removing PCV fittings on a 1995 Grand Cherokee Limited
 

> They are rubber, and if you really have to break them to get them out,
> by definition, they need replacing. The material hardens with heat
> and age. The new ones can be installed without breaking them. The
> idea is that the harder rubber compound does a better job of holding
> the air intake [front hose] and CCV fixed orifice [rear hose] in
> place.

OK, now I understand. I also see why Jeep recommends checking them every
30K miles.

BTW, are there any serious consequences if the crankcase ventilation has
been clogged for months? I havent noticed any significant idle problems,
but I have no idea how long the system has been plugged up. If the PCV
valve becomes clogged, the blow-by gases and oil will just exit through the
intake hose, right?

Thanks again for the help.....

Re: HELP.....removing PCV fittings on a 1995 Grand Cherokee Limited
 

> They are rubber, and if you really have to break them to get them out,
> by definition, they need replacing. The material hardens with heat
> and age. The new ones can be installed without breaking them. The
> idea is that the harder rubber compound does a better job of holding
> the air intake [front hose] and CCV fixed orifice [rear hose] in
> place.

OK, now I understand. I also see why Jeep recommends checking them every
30K miles.

BTW, are there any serious consequences if the crankcase ventilation has
been clogged for months? I havent noticed any significant idle problems,
but I have no idea how long the system has been plugged up. If the PCV
valve becomes clogged, the blow-by gases and oil will just exit through the
intake hose, right?

Thanks again for the help.....

Re: HELP.....removing PCV fittings on a 1995 Grand Cherokee Limited
 

TJM did pass the time by typing:

> BTW, are there any serious consequences if the crankcase ventilation has
> been clogged for months? I havent noticed any significant idle problems,
> but I have no idea how long the system has been plugged up. If the PCV
> valve becomes clogged, the blow-by gases and oil will just exit through the
> intake hose, right?

Months no, many years yes.

The CCV system takes oil fumes out of the engine and burns them. If these
fumes are left in the engine they tend to condense on the valve cover and
form a varnish/sludge. If the sludge gets thick enough it can clump off and
plug oil passages. But that's usually only for very old engines and regular
oil changes will have enough detergent in there to keep the small clumps broken
up till the oil filter grabs them.

--
DougW

Re: HELP.....removing PCV fittings on a 1995 Grand Cherokee Limited
 

TJM did pass the time by typing:

> BTW, are there any serious consequences if the crankcase ventilation has
> been clogged for months? I havent noticed any significant idle problems,
> but I have no idea how long the system has been plugged up. If the PCV
> valve becomes clogged, the blow-by gases and oil will just exit through the
> intake hose, right?

Months no, many years yes.

The CCV system takes oil fumes out of the engine and burns them. If these
fumes are left in the engine they tend to condense on the valve cover and
form a varnish/sludge. If the sludge gets thick enough it can clump off and
plug oil passages. But that's usually only for very old engines and regular
oil changes will have enough detergent in there to keep the small clumps broken
up till the oil filter grabs them.

--
DougW

Re: HELP.....removing PCV fittings on a 1995 Grand Cherokee Limited
 

TJM did pass the time by typing:

> BTW, are there any serious consequences if the crankcase ventilation has
> been clogged for months? I havent noticed any significant idle problems,
> but I have no idea how long the system has been plugged up. If the PCV
> valve becomes clogged, the blow-by gases and oil will just exit through the
> intake hose, right?

Months no, many years yes.

The CCV system takes oil fumes out of the engine and burns them. If these
fumes are left in the engine they tend to condense on the valve cover and
form a varnish/sludge. If the sludge gets thick enough it can clump off and
plug oil passages. But that's usually only for very old engines and regular
oil changes will have enough detergent in there to keep the small clumps broken
up till the oil filter grabs them.

--
DougW

Re: HELP.....removing PCV fittings on a 1995 Grand Cherokee Limited
 

TJM did pass the time by typing:

> BTW, are there any serious consequences if the crankcase ventilation has
> been clogged for months? I havent noticed any significant idle problems,
> but I have no idea how long the system has been plugged up. If the PCV
> valve becomes clogged, the blow-by gases and oil will just exit through the
> intake hose, right?

Months no, many years yes.

The CCV system takes oil fumes out of the engine and burns them. If these
fumes are left in the engine they tend to condense on the valve cover and
form a varnish/sludge. If the sludge gets thick enough it can clump off and
plug oil passages. But that's usually only for very old engines and regular
oil changes will have enough detergent in there to keep the small clumps broken
up till the oil filter grabs them.

--
DougW

Re: HELP.....removing PCV fittings on a 1995 Grand Cherokee Limited
 

Roughly 5/2/04 17:53, TJM's monkeys randomly typed:

>> They are rubber, and if you really have to break them to get them out,
>> by definition, they need replacing. The material hardens with heat
>> and age. The new ones can be installed without breaking them. The
>> idea is that the harder rubber compound does a better job of holding
>> the air intake [front hose] and CCV fixed orifice [rear hose] in
>> place.
>
> OK, now I understand. I also see why Jeep recommends checking them every
> 30K miles.
>
> BTW, are there any serious consequences if the crankcase ventilation has
> been clogged for months? I havent noticed any significant idle problems,
> but I have no idea how long the system has been plugged up. If the PCV
> valve becomes clogged, the blow-by gases and oil will just exit through the
> intake hose, right?

If this engine hasn't had proper care, check the valve cover as
well if plastic, they leak. Pull the hoses and clean thoroughly
or just replace them. Check the air and evap cannister for care
as well.

--
Evolution is merely survival of the minimally adequate