[Healeys] excess oil consumption

Thu Jul 9 14:31:15 MDT 2015

The first check is to remove the oil filler cap on the valve cover with the engine running. Often the worn rocker shaft will show with just that easy first check.

Jim Werner

-----Original Message-----
From: David Nock <healeydoc at gmail.com>
To: Bob Spidell <bspidell at comcast.net>; healeys <healeys at autox.team.net>
Sent: Thu, Jul 9, 2015 1:56 pm
Subject: Re: [Healeys] excess oil consumption

If you install the PCV kit on a car that has a worn rocker assy and using lots of oil the PCV kit will make it worse.   

Like I said earlier pull the rocker cover you will find that the rebuilder installed the worn out rocker assy. The oil will be squirting way to high and causing your problem.   

The other way to check is just fell the bottom of the rear filter it will be soaked with oil.   

One test you can do is remove the vent hose to the rear filter and see if the problem goes away.   

The PCV kit will help stop oil loss due to seal leaks not a worn our rocker assy.   

David Nock    
healeydoc at sbcglobal.net    
209 948 8767    
www.britishcarspecialists.com   

       From:        Bob Spidell       

       Sent: Thursday, July 09, 2015 5:47 AM      

       To:        healeys at autox.team.net       

       Subject: Re: [Healeys] excess oil consumption      

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 at chello.nl> wrote:      

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.         

^        qwarthodson at aol.com schreef op 8-7-2015 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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