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Author Topic: v6 OIL LEAK  (Read 2739 times)

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terry paget

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Re: v6 OIL LEAK
« Reply #30 on: 19 September 2017, 12:06:13 »

A couple of thoughts[that are probably wildly wrong but here goes]Is all the pipe work to the rear multi ram connected correctly?Is the electrical connector of the crank sensor fully seated home[I had idling issues on mine once that I traced down to this]?Or is the crank sensor cable trapped under the cam cover[thereby giving you the oil leak]?Lastly is the IACV properly sealed around the rubber grommet into the engine and fully connected? I'm assuming the 2.5 has the IACV?
Now I see what you mean. The cable from the knock sensor comes up to the main harness up the RH side of the block, and is well placed to get trapped under the cam cover just where you cannot see it. In this pic it is obvious. You will notice I have removed the cam sensor, hole at RH end of cam.
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BazaJT

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Re: v6 OIL LEAK
« Reply #31 on: 19 September 2017, 18:39:39 »

My apologise it was in all probability my poor description,but at least I knew what I meant ;D Anyhow I hope you get it cured soon whatever the cause :y
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TheBoy

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Re: v6 OIL LEAK
« Reply #32 on: 19 September 2017, 18:52:25 »

Due to it running lean before, put a fault on it (unplug MAF etc), then clear codes. This will reset trims.

Then see whats what.


Leaking cam gasket will not let air into engine.
Unplugged MAF sensor, started and ran engine (did not run at all well), diagnostic siad MAF signal zero. Stopped engine, read codes, 19 and 73 (no MAF signal). Plugged MAF sensor in, restarted engine, just the same. It would idle for about 10 seconds, then stall.

Looks like I still have an air leak.

Why do you say leaking cam cover gasket will not leak air into engine? Will it not be sucked into the cam cover, go via the sump to the breather box, through the breather system, emerging at the front of the throttles, and go into the engine. Not unlike the leak when the O-ring between lower inlet manifold and plenum I cured yesterday.
That to me immediately rings Crank Sensor alarm bells.

The 10s of idle, was it a good smooth idle, followed by a sudden engine cut out?
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terry paget

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Re: v6 OIL LEAK
« Reply #33 on: 19 September 2017, 22:51:40 »

Due to it running lean before, put a fault on it (unplug MAF etc), then clear codes. This will reset trims.

Then see whats what.


Leaking cam gasket will not let air into engine.
Unplugged MAF sensor, started and ran engine (did not run at all well), diagnostic siad MAF signal zero. Stopped engine, read codes, 19 and 73 (no MAF signal). Plugged MAF sensor in, restarted engine, just the same. It would idle for about 10 seconds, then stall.

Looks like I still have an air leak.

Why do you say leaking cam cover gasket will not leak air into engine? Will it not be sucked into the cam cover, go via the sump to the breather box, through the breather system, emerging at the front of the throttles, and go into the engine. Not unlike the leak when the O-ring between lower inlet manifold and plenum I cured yesterday.
That to me immediately rings Crank Sensor alarm bells.

The 10s of idle, was it a good smooth idle, followed by a sudden engine cut out?
Yes, it was 10 seconds  of smooth idle, followed by a sudden cut out.
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terry paget

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Re: v6 OIL LEAK
« Reply #34 on: 20 September 2017, 10:24:52 »

Yesterday I removed the LH cam cover again and repeated the whole operation.

Car is running normally again, thanks to all for advice, and Sir Tigger QC for set of Vx cam cover gaskets. There is still a little smoke arising from LH of engine, but I hope that is just old oil burning off.

The air leak problem I conclude was careless fitting of the plenum. I had it off and on a few times as I sorted out the cables and hoses.

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terry paget

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Re: v6 OIL LEAK
« Reply #35 on: 20 September 2017, 17:22:03 »

Gentlemen, I am perplexed. This time I took great care installing the left hand cam cover gasket. I used as new Vx gaskets, I achieved maximum access by removing the scuttle, cam sensor, hanging the wiring out of the way on the corner of the scuttle, and releasing the aircon pipe front screw. I applied the black sealant to all the sharp corners. After practising with a spare cam cover, I manoeuvred the cam cover with gaskets into place. I inserted the 8 screws and carefully torqued them up to 8Nm. I reassembled the engine, left it overnight for sealant to set. I took it for a 10 miles drive this morning.

It still leaks. Under the car there is oil. Looking under the cam cover with a mirror on a stick, it comes out dripping with warm oil.

I wonder what I did wrong, or failed to do. Please advise.

Pic follows of my access to place cam cover to head.
[img]https://www.dropbox.com/s/nku9fhd5sr3mn9a/LHcamsCLEARED.jpg?dl=1[img]
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terry paget

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Re: v6 OIL LEAK
« Reply #36 on: 20 September 2017, 17:25:52 »

Pic
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Sir Tigger QC

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Re: v6 OIL LEAK
« Reply #37 on: 20 September 2017, 18:04:47 »

Where exactly is it leaking Terry?   ???

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terry paget

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Re: v6 OIL LEAK
« Reply #38 on: 20 September 2017, 18:21:40 »

Where exactly is it leaking Terry?   ???
Don't know. I only see it on the floor after a run. However, poking a mirror on a stick down the outside I can see nothing, but the mirror comes out with a little oil on it.
Reading Haynes for the sealan tpart number, I see I did the job exactly as he instructs, except I did not put sealant all round the rear half moons, I just put it on the corner.
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Re: v6 OIL LEAK
« Reply #39 on: 20 September 2017, 18:33:20 »

Are the half moons all seated correctly :-\
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TheBoy

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Re: v6 OIL LEAK
« Reply #40 on: 20 September 2017, 18:47:11 »

Have you wiped off the top of the sump, as that can hold up a fair amount of oil.
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terry paget

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Re: v6 OIL LEAK
« Reply #41 on: 20 September 2017, 18:49:51 »

Are the half moons all seated correctly :-\
I did not think I could see without dismantling everything. I will have a look.
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Re: v6 OIL LEAK
« Reply #42 on: 20 September 2017, 18:51:13 »

Also make sure you haven't blocked the return channels from behind the cam oil seals as if these are blocked the oil will force its' way out through the seals.
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terry paget

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Re: v6 OIL LEAK
« Reply #43 on: 20 September 2017, 18:51:33 »

Have you wiped off the top of the sump, as that can hold up a fair amount of oil.
No. I will go and do so. That would not explain the oil on the mirror though.
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BazaJT

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Re: v6 OIL LEAK
« Reply #44 on: 20 September 2017, 18:52:37 »

Other than all of the above have you checked with a straight edge[a 12" ruler will do]that the covers are straight and not "warped".Mirror on a stick might get you a look at the half moons or you should be able to feel them with your finger tips if the gasket is standing too proud.
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