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I've had a PCV valve installed--the 'Nock Kit'--on my BJ8 for years;
maybe 40K miles or more. It reduced oil consumption from 1qt/1,500
miles to 1qt/3,500 miles or so (highway miles, consumption is a bit more
for around-town miles). There is no downside that I know of; others
have reported gunk on the rear intake valves. I'm contemplating an
engine rebuild; will find out then.
I think 6qts/4,000 miles is way too much for a freshly rebuilt engine.
Your friend could remove the vacuum dashpots--the big dome on the
carbs--and check for oil residue. If the rear is worse than the front
carb it would confirm oil is getting sucked into the rear carb. Does he
have any leakage around the valve cover? That would indicate the
crankcase is getting pressurized. Is he dripping a lot of oil? Is it
leaking from the timing cover seal?
Bob
On 7/9/2015 3:59 AM, Mitch Simmons wrote:
> If u have a pcv installed as per the Nock s version. What are the
> negatives? will it suck oil into the intake? Could there be too much
> vacuum and harm seals gaskets etc. ?? Mitch. 66 bj8
>
> Sent from my iPhone
>
> On Jul 8, 2015, at 2:36 AM, Oudesluys <coudesluijs@chello.nl
>
>> 6 quarts over 4000mls does not sound to bad for an old design British
>> engine. It also depends how the rebuild was done.
>> The main reasons for oil consumption, apart from leaking, are wear of
>> bores/pistons/rings, valve guide wear and blocked/dirty crank case
>> breathing system.
>> Check and clean the crankcase ventilation system first. Check for
>> wear in the valve guides. Check the compression with a hot engine.
>> That the engine was professionally rebuild does not mean anything, it
>> depends who has done the job. It is also peculiar that after a
>> rebuild a few years ago, a ring job was needed not so long ago!!!!!?????
>>
>> Kees Oudesluijs
>>
>> It is very unlikely that the air filters have something to do with
>> the oil consumption. There is no vacuum to speak of created there,
>> unless they are totally blocked or are absolutely tiny.
>>
>> om 1:55:
>>> A friend ask me to post the following question about excess oil
>>> consumption on this forum to see if anyone has any suggestions.
>>> I know the engine has been professionally rebuilt a few years ago &
>>> the compression & leak down tests recently looked "normal". No oil
>>> leaks.
>>> Thanks,
>>> Gary Hodson
>>> I had a brief conversation with my mechanic the other day and in the
>>> next couple of weeks he will do a complete diagnosis on my Healey to
>>> try to identify why I have had so much oil consumption. FYI, I just
>>> emptied the 6^th quart of oil into the engine yesterday ? and that
>>> is over 4,000 miles. It is better than before the recent ring job,
>>> but nonetheless, is not acceptable to me.
>>> Mechanic thinks the oil loss might be due to combustion of the oil
>>> from the back air cleaner that is plumbed with the valve cover.
>>> He thinks the air cleaner I have on it now is somehow creating a
>>> vacuum pulling oil from the valve cover and injecting it back into
>>> the piston and is actually burning the oil off very efficiently. I
>>> still don?t have any signs of leaks beneath the car nor any smoke
>>> from the tailpipe. Quite possibly the current Cooper air cleaners
>>> are too small and are creating this vacuum. The Cooper air cleaners
>>> replaced some other chrome air cleaners the original owner had on
>>> the car ? I don?t know if it was original equipment.
>>> Will you do me a favor and see if anyone else had a similar issue
>>> with oil consumption to identify a ?solution? that worked for them?
>>> Maybe there are other thoughts that we should ask my mechanic to
>>> examine as well.
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I've had a PCV valve installed--the 'Nock Kit'--on my BJ8 for years;
maybe 40K miles or more. It reduced oil consumption from 1qt/1,500
miles to 1qt/3,500 miles or so (highway miles, consumption is a bit
more for around-town miles). There is no downside that I know of;
others have reported gunk on the rear intake valves. I'm
contemplating an engine rebuild; will find out then.<br>
<br>
I think 6qts/4,000 miles is way too much for a freshly rebuilt
engine. Your friend could remove the vacuum dashpots--the big dome
on the carbs--and check for oil residue. If the rear is worse than
the front carb it would confirm oil is getting sucked into the rear
carb. Does he have any leakage around the valve cover? That would
indicate the crankcase is getting pressurized. Is he dripping a lot
of oil? Is it leaking from the timing cover seal?<br>
<br>
Bob<br>
<br>
<div class="moz-cite-prefix">On 7/9/2015 3:59 AM, Mitch Simmons
wrote:<br>
</div>
<blockquote
cite="mid:B737DD74-C124-4C57-A1B4-A2B13002A3D5@comcast.net"
type="cite">
<meta http-equiv="content-type" content="text/html;
charset=windows-1252">
<div>If u have a pcv installed as per the Nock s version. What are
the negatives? will it suck oil into the intake? Could there be
too much vacuum and harm seals gaskets etc. ?? Mitch. 66 bj8<br>
<br>
Sent from my iPhone</div>
<div><br>
On Jul 8, 2015, at 2:36 AM, Oudesluys <<a
moz-do-not-send="true"
href="mailto:coudesluijs@chello.nl";>coudesluijs@chello.nl</a>>
wrote:<br>
<br>
</div>
<blockquote type="cite">
<div>
<meta content="text/html; charset=windows-1252"
http-equiv="Content-Type">
<div class="moz-cite-prefix">6 quarts over 4000mls does not
sound to bad for an old design British engine. It also
depends how the rebuild was done.<br>
The main reasons for oil consumption, apart from leaking,
are wear of bores/pistons/rings, valve guide wear and
blocked/dirty crank case breathing system.<br>
Check and clean the crankcase ventilation system first.
Check for wear in the valve guides. Check the compression
with a hot engine. <br>
That the engine was professionally rebuild does not mean
anything, it depends who has done the job. It is also
peculiar that after a rebuild a few years ago, a ring job
was needed not so long ago!!!!!?????<br>
<br>
Kees Oudesluijs<br>
<br>
It is very unlikely that the air filters have something to
do with the oil consumption. There is no vacuum to speak of
created there, unless they are totally blocked or are
absolutely tiny. <br>
<br>
^<a moz-do-not-send="true"
href="mailto:qwarthodson@aol.com";>qwarthodson@aol.com</a>
schreef op 8-7-2015 om 1:55:<br>
</div>
<blockquote
cite="mid:14e6af290e3-de4-413c4@webprd-m69.mail.aol.com"
type="cite">
<meta http-equiv="Context-Type" content="text/html;
charset=utf-8">
<div class="MsoNormal">A friend ask me to post the following
question about excess oil consumption on this forum to see
if anyone has any suggestions.</div>
<div class="MsoNormal">I know the engine has been
professionally rebuilt a few years ago & the
compression & leak down tests recently looked
"normal". No oil leaks. </div>
<div class="MsoNormal">Thanks,</div>
<div class="MsoNormal">Gary Hodson</div>
<div class="MsoNormal"> </div>
<div class="MsoNormal">I had a brief conversation with my
mechanic the other day and in the next couple of weeks he
will do a complete diagnosis on my Healey to try to
identify why I have had so much oil consumption. FYI, I
just emptied the 6<sup>th</sup> quart of oil into the
engine yesterday ? and that is over 4,000 miles. It is
better than before the recent ring job, but nonetheless,
is not acceptable to me.</div>
<div class="MsoNormal"> </div>
<div class="MsoNormal">Mechanic thinks the oil loss might be
due to combustion of the oil from the back air cleaner
that is plumbed with the valve cover. He thinks the air
cleaner I have on it now is somehow creating a vacuum
pulling oil from the valve cover and injecting it back
into the piston and is actually burning the oil off very
efficiently. I still don?t have any signs of leaks
beneath the car nor any smoke from the tailpipe. Quite
possibly the current Cooper air cleaners are too small and
are creating this vacuum. The Cooper air cleaners
replaced some other chrome air cleaners the original owner
had on the car ? I don?t know if it was original
equipment.</div>
<div class="MsoNormal"> </div>
<div class="MsoNormal">Will you do me a favor and see if
anyone else had a similar issue with oil consumption to
identify a ?solution? that worked for them? Maybe there
are other thoughts that we should ask my mechanic to
examine as well.</div>
<div class="MsoNormal"> </div>
</blockquote>
</div>
</blockquote>
</blockquote>
<br>
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