Author Topic: Oil leak at rear of 2ltr  (Read 623 times)

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NSharpley

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Oil leak at rear of 2ltr
« on: July 24, 2019, 09:18:44 PM »
Now I know this is probably one of the oldest and most talked about topics but ...

I had an oil leak at the rear of the engine and was planning on an engine bay cleanup so decided to pull the engine out and do the common seals / gaskets whilst doing the engine bay work.

Replaced the sum gasket, rear main seal and the gasket for the oil galley cover plate.

Engine back in and ran up to temp ... everything seems ok.

Not only do I still have an oil leak (granted it isnt anywhere near as bad) but the leak is constant.   The engine hasnt run now for a couple of weeks and still the oil drips.

I can wipe away the drips and then the next day, more drips.

What area at the back has oil sitting right next to a gasket or seal when the car is stationery?

All of the oil shouldve by now drained back into the sump.

The drips appear on the rear sump bolts.   

I have re-tightened those, although they werent loose.

But where is this oil coming from??

I can understand if it were the rear main or the sump, when the engine is running ... but this just keeps on dripping.

Its definitely coming from inside the bell housing so isnt cam cover or anything above ...

Suggestions?
Current Alfa:
1975 Alfetta GT 2.0

Past Alfas:
1989 Alfa75 2.5ltr
1982 Alfetta Sedan 2.0
1976 Alfetta GT

rowan_bris

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Re: Oil leak at rear of 2ltr
« Reply #1 on: July 25, 2019, 06:55:25 AM »
Did you replaces the wicks between the rear main cap and block?

NSharpley

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Re: Oil leak at rear of 2ltr
« Reply #2 on: July 25, 2019, 08:09:32 AM »
I didnt but there isnt any oil sitting against those when the car is stationary so it shouldnt be leaking from there when the car is sitting.

Running, sure ... but not stationary.

Current Alfa:
1975 Alfetta GT 2.0

Past Alfas:
1989 Alfa75 2.5ltr
1982 Alfetta Sedan 2.0
1976 Alfetta GT

bonno

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Re: Oil leak at rear of 2ltr
« Reply #3 on: July 25, 2019, 08:36:56 AM »
I am with Rowan, also known as cigarette seal. Also I have a post from Alfa Romeo BB on this issue.
https://www.alfabb.com/bb/forums/engine-repair-diagnostics-rebuilding/649754-cigarette-seal-variations-2.html
now
83 Alfetta GTV
05 156 JTS manual
past
00 156 selespeed
72 1750 GTV

NSharpley

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Re: Oil leak at rear of 2ltr
« Reply #4 on: July 25, 2019, 09:29:38 AM »
Yeah, I am very familiar with these seals but my point is ... the engine is constantly leaking oil whilst NOT running.

There is no oil actively near those cigarette seals when the engine is off so there is no way the leak could be coming from there.

My suspicion is that the car isnt sitting level at the moment because its on stands and the front is higher than normal.

So it stands to reason that the oil is actually resting up against the rear portion of the gasket and seeping through.

Current Alfa:
1975 Alfetta GT 2.0

Past Alfas:
1989 Alfa75 2.5ltr
1982 Alfetta Sedan 2.0
1976 Alfetta GT

bonno

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Re: Oil leak at rear of 2ltr
« Reply #5 on: July 25, 2019, 10:55:10 AM »
To prove your theory and the sump bolts have been torqued correctly, I would try and nip up all bolts another 1/2 to 1 turn and see if it fixes the leak. If not, you may need to investigate further such as possible cracks, with focus around leak area.
now
83 Alfetta GTV
05 156 JTS manual
past
00 156 selespeed
72 1750 GTV

carlo rossi

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Re: Oil leak at rear of 2ltr
« Reply #6 on: July 25, 2019, 11:11:09 AM »
Sorry mine did the same ,the guy cut the cigarette seals too short !
talk to Rob at brookvale
bit of a guru with this
I went through half a litre a week just standing
I think the oil drips down from the head when stationary
current cars
red 83 gtv 2.0


previous cars
Red 76 1.2/1.5 alfasud ti
white 79 alfetta 2000
alfetta 74 1.8
escort Lotus twin cam
bikes
ducati 900 ss 1979
moto morini 3 1/2 sport 1975/6
Moto morini 3 1/2 valentini speciale 77 oh and a deltek rockhopper

giulia_veloce

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Re: Oil leak at rear of 2ltr
« Reply #7 on: July 26, 2019, 06:26:13 AM »
Oil can leak from the 2 middle rear sump bolts
Remove bolts,,clean bolts and holes with brake cleaner,,and use ultra grey on threads and washer and install.
Also on Alfetta engines,,there is an Oil bolt on the rear of the engine that can come loose and leak.
Those 2 rear head Allen key nuts leak,,especially exhaust side,so make sure they are tight.
Cigarette seals are a common leak area (ask Carlo).
I Modify them and use the Alfa Special tool to insert them .
The rear main seal is Not normally the problem,,its the cigarette seals.,,2 rear centre sump bolts,rear head allen nuts etc.'

NSharpley….clean the area with brake cleaner,,compressed air to dry it,,and have another look.

 

NSharpley

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Re: Oil leak at rear of 2ltr
« Reply #8 on: July 27, 2019, 06:27:17 PM »
I reckon you're on it with those rear sump bolts.

Mine only had oil on the one sump bolt so I just gave it a 1/2 turn, clean up any oil and left it overnight.

No sign of further leaks.

Will leave it for another 24 hours and check again.

Thanks for the tip.

Current Alfa:
1975 Alfetta GT 2.0

Past Alfas:
1989 Alfa75 2.5ltr
1982 Alfetta Sedan 2.0
1976 Alfetta GT

NSharpley

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Re: Oil leak at rear of 2ltr
« Reply #9 on: November 11, 2019, 01:20:36 PM »
Well ... in the interests of closure ... I did the cigarette seals.

Ran it up to temp ... no leaks.

Current Alfa:
1975 Alfetta GT 2.0

Past Alfas:
1989 Alfa75 2.5ltr
1982 Alfetta Sedan 2.0
1976 Alfetta GT

LukeC

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Re: Oil leak at rear of 2ltr
« Reply #10 on: November 13, 2019, 11:43:29 PM »
Haven't used the supplied cigarette seals for years... Chucked them in the bin! Eventually they go hard, shrink and leak.

Permatex Grey is your friend here. There is a reason that later V6 engines went this way.

You can build an almost oil leak free Nord engine using a few mods and modern sealing compounds.

Luke Clayton

qvae.com.au