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Jeff Cardinal

Jeff ... 4/1/2010

1980 MG MGB MK IV 4 Cyl 1.8L

Engine

How do I stop my car from burning oil?

(72 MG midget) I rebored the cylnders. new pistons & rings, new valve guides, new valve stem seals. Burns oil & smokes. Tore down engine again, re checked tolerances, re-honed cyls and bought new rings, still smokes like a chimney. Goes thru a quart of oil in 200 miles. What to do? What to do?

7 Answers


yboy82

yboy82 7/13/2010

Did you also replace your cylinder head gasket? You didn't mention it.

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Jeff Cardinal

Jeff Cardinal 7/13/2010

Yes. I never re-use a gasket.

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yboy82

yboy82 7/13/2010

Did you replace the o-rings in your spark plugs?

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Jeff Cardinal

Jeff Cardinal 7/13/2010

spark plugs don't have O rings.

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72_rs-ss

72_rs-ss 7/13/2010

you've mentioned all things I would have thought, except one.. did you have the heads magnifluxed to see if there were any cracks?

there is only one other possibility but on a 72 might be rare, I've seen on some vehicles with PCV valves attatched to the intake manifold where the PCV valve malfunctioned and was putting oil into the carb ... there is also on the 84 Subarus (just for example) another rubber line that has an oil connection into it which puts some oil on the air filters (without the use of a pcv valve)
if you have any hoses connected to the air cleaner it wouldn't hurt to give them a look-see
hope this helps

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72_rs-ss

Jeff Cardinal 9/28/2011

magnafluxing sounds like a good idea. this engine has pressurized oil passages that oil the rockers. thanks for the tip (no hoses to the aircleaners)

Tom

Tom 7/19/2010

When you replaced the rings, did you rotate them around differently for each ring so no two ring gaps were aligned?

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Tom

Jeff Cardinal 9/28/2011

yes

timmy

timmy 9/28/2011

are you using unleaded gas? i did the same on my 72 B and wore out the valve guides because they need leaded fuel for lubrication. you can buy lead additives

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timmy

Jeff Cardinal 9/28/2011

I have two identical midgets. The other one was rebuilt exactly the same way and it has been running beautifully for about seven years with 100% sucess, with no excess oil consumption. I haven't had any problem with valve guide wear. Besides It was burning oil with brand new guides. I don't add any additives to the regular unleaded I use.

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