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Poppet
Joined: 27 May 2008 Posts: 10
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Posted: Tue May 27, 2008 7:03 pm Post subject: marina engine oil leak - help? |
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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 |
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Rick Site Admin
Joined: 27 Apr 2005 Posts: 22472 Location: UK
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Poppet
Joined: 27 May 2008 Posts: 10
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Posted: Tue May 27, 2008 7:16 pm Post subject: oil leak |
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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 |
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Poppet
Joined: 27 May 2008 Posts: 10
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Posted: Tue May 27, 2008 7:17 pm Post subject: oil leak |
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Also;
the plugs are not oiling up which I thought would have been indicative of worn/broken rings??
Steve |
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47p2
Joined: 24 Nov 2007 Posts: 2009 Location: Glasgow
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Posted: Tue May 27, 2008 7:31 pm Post subject: |
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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? _________________ ROVER
One of Britain's Fine Cars |
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Dirty Habit
Joined: 26 Mar 2008 Posts: 398 Location: West Midlands, UK
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Posted: Tue May 27, 2008 7:34 pm Post subject: |
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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 |
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peter scott
Joined: 18 Dec 2007 Posts: 7126 Location: Edinburgh
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Posted: Wed May 28, 2008 9:00 am Post subject: |
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My vote goes with the broken rings.
Peter |
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Peter_L
Joined: 10 Apr 2008 Posts: 2680 Location: New Brunswick. Canada.
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Posted: Wed May 28, 2008 2:09 pm Post subject: |
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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. |
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clan chieftain
Joined: 05 Apr 2008 Posts: 2041 Location: Motherwell
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Posted: Wed May 28, 2008 6:19 pm Post subject: |
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I would go for the rings as well. _________________ The Clan Chieftain |
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Uncle Joe Guest
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Posted: Wed May 28, 2008 6:50 pm Post subject: |
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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. |
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TonyBrooks
Joined: 02 Jan 2008 Posts: 108 Location: Maidenhead
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Posted: Thu May 29, 2008 4:46 am Post subject: |
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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. |
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Poppet
Joined: 27 May 2008 Posts: 10
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Posted: Fri May 30, 2008 10:10 am Post subject: oil leak |
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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 |
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