Thor Oil cap sucking & noise

[Ghind]

Hi All

Please see this video: https://www.youtube.com/watch?v=jXEvWDpxgpQ&feature=youtu.be

1. Is the oil cap suction normal?
2. What is the squealing noise that comes when the cap is on and goes when it is off. Pulling the dipstick is enough to get the noise to stop too

Thanks!

[Eevo]

the video is private

[discovery39]

X2!!!???

[PhilipA]

Sucking is GOOD.
Have a look at the crankcase air inlet which AFAIR has a little non return valve in it, which may be sticking closed.
It is located on the LH rocker cover behind the throttle body.
Regards Philip A

[Ghind]

the video is private



Thanks. Sorry fixed

[Blknight.aus]

crank cae ventilation system is defective, typically the air inlet port/hose ha blocked, occaisionally the reulation valve (if fitted) has stuck wide open.

on the plus side, the engine ise very unlikely to leak oil while its doing what its doing but it will draw any contaminantesin though wehreever the air is getting drawn in so dont go fording with it like that.

[Ghind]

Thank you. I'm not certain which hose you mean, is it the one I've circled in red?

[Ghind]

I've removed & checked the LHS tube and found it was clear & near new. Even with it in place & with those hose clamped back on it, the other end of that hose generated plenty of vacuum & airflow (tested by thumb!)

[Ghind]

https://www.youtube.com/watch?v=ouCZgtl0QNE

In this video, I've removed the right hand side hose. The suction is huge.

Things of note:

1. There is no spiral filter on this side
2. The brass fitting seems non standard. Does that matter?
3. The suction is coming from the brass fitting. It is sucking so hard that it is making it very difficult to open the oil filler cap


I assume there should be a spiral PCV filter on this side and the lack of filter means that far too much intake suction is being applied to the crank case. Does this seem correct?

The engine is throwing P1171, P1174 and a MAF codes (I can't remember what it is right now) but will look it up.

I suspect this is all related. Thoughts please?

[Ghind]

Swapped it over, sucking fixed. Will report back about codes.

Thanks heaps!

[bee utey]

Clearly the brass fitting you're playing with will give you full manifold vacuum so of course it'll suck at your finger. The fitting has probably been replaced by a well meaning mechanic when he leant on the original plastic fitting and broke it off. I'd suggest you find a plug you can insert in the drivers side hose and drill a 2mm hole through it. This should allow enough flow to remove the fumes without overwhelming the fresh air inlet pipe on the throttle body side.

Edit: Oh I see you swapped the plastic curly filter, it should do the same as a restrictor jet.

[PhilipA]

I am a bit confused as to what you have done.

The brass fitting and other fitting on that side should have heaps of manifold vacuum and have no connection to the crankcase ventilation.

That hose if for the brake booster so should suck like mad.

You will note that the inlet for the crankcase is BEFORE the throttle plate and this means that there should be no or only a little vacuum there.

Regards Philip A

[Ghind]

I still wonder if the brass fitting allows too much airflow and am considering getting the proper replacement. Or at least checking the inside diameter of it to see if it really matters

I've done an adaptive reset and cleared all codes with my Black Box SV-1 so hopefully they won't come back

Philip, you've got me worried. I think I've done the right thing though. I've installed it in the same place as this one http://www.aulro.com/afvb/technical-chatter/209678-v8-oil-separator-replacement-photos.html

I assume the pictures in that PDF are for the Bosch engine. From memory, the GEMS is in the same spot though??

The car is right hand drive and the oil separator is now in the drivers side. The location of the separator is circled in yellow here

[Blknight.aus]

I reccomend the oem parts or at aonimum parts thag are functionally the same or pattern copies

[TheTree]

I still wonder if the brass fitting allows too much airflow and am considering getting the proper replacement. Or at least checking the inside diameter of it to see if it really matters

I've done an adaptive reset and cleared all codes with my Black Box SV-1 so hopefully they won't come back

Philip, you've got me worried. I think I've done the right thing though. I've installed it in the same place as this one http://www.aulro.com/afvb/technical-chatter/209678-v8-oil-separator-replacement-photos.html

I assume the pictures in that PDF are for the Bosch engine. From memory, the GEMS is in the same spot though??

The car is right hand drive and the oil separator is now in the drivers side. The location of the separator is circled in yellow here

Hi

Yes the GEMS is in the same spot on the rocker cover

Steve

[PhilipA]

OK , from a bit of research that I have done the spiral separator should be in the RH rocker cover not the left.
The LH rocker cover is the inlet and the RH is the outlet and the spiral separator is to separate oil from mist..

This may in itself reduce the vacuum you are feeling but, I seem to recall that the hose should go into another stub on the inlet manifold near the throttle body.
I adapted a Thor manifold to a 3.9 CUX so mine was not the same.
Regards Philip A

[PhilipA]

EMISSION CONTROL - V8
17-2-10 DESCRIPTION AND OPERATION
Crankcase emission control system
The concentration of hydrocarbons in the crankcase of an engine is much greater than that in the vehicle's exhaust
system. In order to prevent the emission of these hydrocarbons into the atmosphere, crankcase emission control
systems are employed and are a standard legal requirement.
The crankcase ventilation system is an integral part of the air supply to the engine combustion chambers and it is
often overlooked when diagnosing problems associated with engine performance. A blocked ventilation pipe or filter
or excessive air leak into the inlet system through a damaged pipe or a leaking gasket can affect the air:fuel mixture,
performance and efficiency of the engine. Periodically check the ventilation hoses are not cracked and that they are
securely fitted to form airtight connections at their relevant ports.
The purpose of the crankcase ventilation system is to ensure that any noxious gas generated in the engine crankcase
is rendered harmless by complete burning of the fuel in the combustion chamber. Burning the crankcase vapours in
a controlled manner decreases the HC pollutants that could be emitted and helps to prevent the development of
sludge in the engine oil as well as increasing fuel economy.
A spiral oil separator is located in the stub pipe to the ventilation hose on the right hand cylinder head rocker cover,
where oil is separated and returned to the cylinder head. The rubber ventilation hose from the right hand rocker cover
is routed to a port on the right hand side of the inlet manifold plenum chamber where the returned gases mix with the
fresh inlet air passing through the throttle butterfly valve. The stub pipe on the left hand rocker cover does not contain
an oil separator, and the ventilation hose is routed to the throttle body housing at the air inlet side of the butterfly valve.
The ventilation hoses are attached to the stub pipe by metal band clamps.
From RAVE.
There does not appear to be another restriction other than the spiral thingo.
Looks like someone removed the rocker covers and put them on wrong sides.
Regards Philip A

[Hoges]

From RAVE.
There does not appear to be another restriction other than the spiral thingo.
Looks like someone removed the rocker covers and put them on wrong sides.
Regards Philip A

can't happen.. there's no room on the LHS of the engine for the RHS rocker cover with the oil filler..

[TheTree]

OK , from a bit of research that I have done the spiral separator should be in the RH rocker cover not the left.
The LH rocker cover is the inlet and the RH is the outlet and the spiral separator is to separate oil from mist..

This may in itself reduce the vacuum you are feeling but, I seem to recall that the hose should go into another stub on the inlet manifold near the throttle body.
I adapted a Thor manifold to a 3.9 CUX so mine was not the same.
Regards Philip A

This is definitely correct the RH rocker cover has the spiral oil separator, on both GEMS and THOR

Steve

[Ghind]

The previous owner had installed the oil separator in the wrong rocker cover. Still like him though! :) Hoges, PhilipA didn't mean the rocker covers were swapped, he meant the oil separator spiral thingy was in the wrong rocker cover. i.e that the previous owner had installed it in the left side instead of the right side.

Early days yet but it idles even better, noise is gone, fuel economy seems better (it was thirsty), the oil cap is not sucked on any more and the codes haven't come back. I will drive it a bit and monitor the adaptive values.

Anybody know the correct part number for the fitting which has been replaced by the brass hose nipple in my photos? I'd like to compare the size to see if I should put the OEM fitting back.

[Hoges]

Mea culpa...!:wasntme:...um...yes it was...bugger!
There's a write up re. the brass fitting somewhere here early 2014 The original plastic one split during 40+ deg C heat just before Christmas 2013 during a trip from Melb to Kiama. IIRC the replacement 1/4" BSP fitting has the same internal dimensions as the plastic oem part. Still waiting on the photos:D SWMBO is away caring for her Mum. I am suffering severe p38 withdrawl...:angel::twisted: Glad it's got a good home!