Very high oil consumption

[Highwaylass]

Thanks! I've given it a clean just in case.

[notsmartcar]

It won't be the reed valve it's rings/scored bore etc. the valve check valve system when it's broke will pour oil out of the points box before you notice it as blue smoke

[Highwaylass]

Yep, there's oil in the points box too. What are you saying is broken?

[notsmartcar]

If you don't have a compression tester or means of testing the crankcase vacuum you may find a member in your area to check it out for you. Looks like a head and barrels of job.

[Highwaylass]

I've got a compression tester - going to investigate this weekend.

You said that if the 'valve check system" was broken there would be oil in the points box, I just wondered what you meant.

[notsmartcar]

There is no oil seal in the points box so when the check valve system fails or the piston blow-by is too much for it to cope you start to loose vacuum then amount of oil blown into the points box increases

[Highwaylass]

Thanks! And the check valve is the thing inside the oil filler?

[notsmartcar]

as the pistons move in and out together there would be a lot of air every revolution being moved in and out of the crank case if the crank case only had a pipe to the air filter,so to save pumping all this air about they put a check valve(one way valve so air will be pushed out of the crankcase but not allowed back in ) in the oil filler neck (or an after market valve in the pipe to the air cleaner) to try and maintain a vacuum in the crankcase which also stops the oil escaping into the points box as there is no seal there ,hence oil in the points box lets you know some thing may be amiss

[Highwaylass]

Scores on the doors:
Left: 110 / 120 after oil added
Right: 130 / 145 after oil added

Engine warm, throttle wide open.

Not great, is it

[Ken Hanna]

If you hadn't adjusted the valve clearances before carrying out the compression test,
it might be worth checking that they're within tolerance.
I always aim for 0.25mm 'loose fit' on the exhaust valves and 0.25mm 'sliding fit' on
the inlets, with the engine cold.
If they're too tight, that can have an effect on the results of a compression test.
Maybe clutching at straws, but thought it worth mentioning...

Ken

( I checked over a 'fully rebuilt' 2CV a few weeks back, which wasn't running too well,
despite having covered fewer than 500 miles since the owner had handed over £7,000.
All of the valve clearances were much too tight, with the worst having barely 0.05mm. )

Scores on the doors:
Left: 110 / 120 after oil added
Right: 130 / 145 after oil added

Engine warm, throttle wide open.

Not great, is it