Member Since: 25 Mar 2015
Location: Australia
Posts: 7
oil inside intake manifold?
Hi guys, love the forum, long time lurker first time poster.
I'm by no means a mechanic, but like to learn and do things myself on my discos.
I have a D3 4.4L V8 HSE. Today I was pulling some things off to replace the thermostat housing and water pump (due to a coolant leak), and I noticed that inside my intake manifold is a lot of oil. Have a look at the photo's below and you can see how bad it is. It is actually pooling in the bottom maybe 4-5mm deep.
Has anyone experienced this before? Particularly on the V8?
I've only owned the vehicle for about 6 months, so don't know a lot about the history and maintenance. It's got about 135k's on the clock.
It actually hasn't been running bad, but I'm guessing it will run a lot better once I give it a clean along with the electronic throttle body which also looks pretty grotty.
I'm guessing it has come up through the crankcase breather and I will be checking the PCV valve in the morning, but I would love to get some other opinions as I'm sure a few of you guys have dealt with this before?
Cheers!
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25th Mar 2015 1:22 pm
yaxman
Member Since: 02 Jan 2015
Location: pontyclun
Posts: 433
Wow :/ lets hope it is something simple.
is the metal assembly where the butterfly valve is situated (Bottom 2 pics) has it got any oil in it ? Itll probably be dirty. But any signs of fresh oil?
25th Mar 2015 1:30 pm
tripwu
Member Since: 25 Mar 2015
Location: Australia
Posts: 7
Yes. Not sure how fresh, but it is certainly there. I could even see oil coming directly from the breather hose.
25th Mar 2015 1:33 pm
lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
Temporarily route the breather pipe into a suitable container and blank the hole into the manifold run it for a few hundred miles and see what happens.
Ive now had a couple of diesel cars that collected loads of oil in the manifolds, then when breather routed to container there was no oil residue at all!
25th Mar 2015 3:11 pm
tripwu
Member Since: 25 Mar 2015
Location: Australia
Posts: 7
Thanks mate, I might try that if it continues. I understand this is more common on diesels.
Another option is to loop in an aftermarket oil seperator, but I'm hoping to find a faulty hose or clogged PCV valve and fix it up as stock.
25th Mar 2015 3:28 pm
Allan_T
Member Since: 10 Sep 2012
Location: Northampton
Posts: 1034
Instead of venting the crankcase straight into the atmosphere you could fit a oil catch tank.
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GAP IID Pro Multi Vehicle Defender L316 2007-2015 - Discovery 3 - Discovery 4 - Discovery Sport L550 - Freelander 2 - Range Rover Evoque L538 - Range Rover L322 - Range Rover L405 - Range Rover Sport L320 - Range Rover Sport L494 Electrical Fault Diagnostics
25th Mar 2015 3:29 pm
tripwu
Member Since: 25 Mar 2015
Location: Australia
Posts: 7
Thanks guys,
I ended up just giving the manifold and throttle body a good clean and replacing the PCV valve. Seems to be running fine.
Cheers.
29th Mar 2015 2:47 am
lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
Allan_T wrote:
Instead of venting the crankcase straight into the atmosphere you could fit a oil catch tank.
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I did that a few years ago on a 93 defender, problem was pipe run was so long it seemed to cause the oil mist to congeal and semi block the pipework and the catch tank, routed it to atmosphere and no mist or mess since.
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