Head off required for a de-coke?

[twincamman]

I discovered when unsiezing a europa renault motor that penetrating oil in the piston and on the valve applied through the carbs reduces carbon to the consistency of puppy sh4t allowing it to burn off ----ed

[1964 S1]

Can an engine be de-coked by lightly spraying water into the carbs, one by one while the engine is running after it's warmed up?
What do the tops of your pistons look like if you shine a light down in the open spark plug hole?

[Tonyw]

One simple way to check if the valves are leaking/not sealing is simply remove all spark plugs do a compression test throttle fully open, write down all readings then squirt three or four squirts of engine oil into each cylinder and do the compression test again, if there is little or no difference to the two low readings then the valves are not sealing, if however the readings improve greatly then you have problems in the piston/ring or bore department, the oil makes a false and temporary seal, if you have any significant loss of compression through the piston rings your two good cylinder will be much higher also.

This is or should be fairly common pratice with any decent garage.

Tony

[stuartgb100]

Oops.

That'll teach me to drink red wine before the meal !

Thanks for the correction.

See also that it wasn't a 911 either.

Regards,
Stuart.

[twincamman]

ahhhTony---I fell for that ...suposed to tell if its the valves or the rings --and it does with 2 DROPS of oil----any more [like squirts] and it breaks things -like rings and valves and pistons your gauge and will quickly sit your on your ass if your on the compression gauge side ----a leak down test is safer and better --ed

[andrewdmoore]

Sorry - you're dealing with a luddite here, does 'chokes fully open' mean that someone has to sit pressing the throttle to the floor or is it a carb setting.

Thanks for all your help so far.

[types26/36]

does 'chokes fully open' mean that someone has to sit pressing the throttle to the f.

Yes and with the engine @ operating temp,

[twincamman]

its O.K. andrew ---we don't care about religion on the site ---- --ed

[john.p.clegg]

Andrew

You don't have to get someone to hold the pedal down,operate the throttle by hand on the carbs and a well placed screwcriver in the operating mechanism should hold them fully open....

John

[andrewdmoore]

Thanks for your advice. Head off it is. I contacted QED who apparently dont do engine work anymore and they recommended Component Engineering at Hapton near Burnley. I spoke to Graham the owner who was really pleasant and helpful - he owns an S3 & S4 aswell which helps. When he said it was a small family run business that swung it for me

Tony Thompson also endorsed them - he outsources his engine work (although not to Component). Has anyone else used them?

Thanks again for your help, I will keep you advised on results.