Classic cars forum & vehicle restoration.

[Poppet]

Hi
I have a 1963 Morris minor traveller with a marina 1300 engine who is loosing a great deal of oil from the breathers and dip stick tube. Does any one have any ideas re. cause and repair?
Thanks
Steve

[Rick]

sounds like the oil in the crankcase is getting pressurised, are the rings shot? does the engine run ok, apart from this leakage issue?? I had thought that the engine breather pipe might have been blocked, but if oils coming out of there too I guess it isn't

PS welcome to the forum

Rick
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[Poppet]

Hi
If the rings were shot would I be getting good oil pressure when the oil level is fullt topped up?
Steve
ps
thanks for the welcome

[Poppet]

Also;
the plugs are not oiling up which I thought would have been indicative of worn/broken rings??

Steve

[47p2]

Oil pressure is nothing to do with piston rings, therefore if the rings were shot it would not affect the pressure. Oil pressure is where the oil travels through the bearing journals. Big ends, Mains, Camshaft, Rockershaft.

If the plugs are not oiling up it could be that the oil is being burnt off, or more likely the valve guides are worn, causing the pressure build up.

Have you done a compression test?
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ROVER
One of Britain's Fine Cars

[Dirty Habit]

If the rings and or bores are worn the gases from combustion are making their way into the crankcase. The oil that feeds the bores and pistons is not under the same pressure as the crank, camshaft. These items could be in good order and so give you reasonable oil pressure.
With the engine running, remove the oil filler cap and see if it is "chuffing", for the want of a better word. Keep a rag handy as you could get splashes of oil thrown out from the movement of the valves.
_________________
1964 International Harvester

[peter scott]

My vote goes with the broken rings.

Peter

[Peter_L]

Maybe even a burnt piston. A small hole in the piston can cause pressure bypass with little or no effect on oil consumtion, a small reduction in power, no effect on oil pressure at the gauge but would increase crankcase pressure.

Certainly a time for a compression test.

Worn valve guides or stem seals would lift rocker box pressure and push out oil airborne oil droplets that are there.

[clan chieftain]

I would go for the rings as well.
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The Clan Chieftain

[Uncle Joe]

I'm going to put my two penn'orth in here.

If the rings are broken, its audible. If they are worn, and need changing, there will be oil smoke out of the exhaust during engine braking, or changing gear. So a compression check isnt needed.

One thing I did think about though. Dont Marina 1300's have the one way ventilation valve in the block as the later B series do? I know from old that this gets blocked and causes the same symptoms.

[TonyBrooks]

I had a similar problem on my Saab V4 - it got to the stage that I attached a length of petrol pipe to the dip stick tube and led it to a seperate home made catch tank. I ran it like that for several months and used to empty the oil back into the engine after a trip. When I stripped the engine all I needed to do was replace the rings and the problem disappeared.

[Poppet]

Thanks for all the advice - piston rings seem to be the problem. I've been doing the same re catching the leaking oil! Managed to track down another Marina engine and so will repair the old engine when it's out and time is on my side.
Steve