Engine stop rolling

[workaholic_ro]

Originally Posted by jymix

I have already done the test buttons on the intake valves. on the test with the pressure, it was not conclusive because the air doesn't compress

Can you detail what exactly you have done ?

[jymix]

I introduced a pipe with a diameter slightly larger than a spark plug to prevent air leakage in place of the spark plug. and using an air compressor I was sent the air but to no avail because the air does not compress

[workaholic_ro]

Originally Posted by jymix

I introduced a pipe with a diameter slightly larger than a spark plug to prevent air leakage in place of the spark plug. and using an air compressor I was sent the air but to no avail because the air does not compress

1. are you sure that all four valves of that cylinder were closed, cams up ?
2. did you use a rubber pipe and there was no air leak along the hole thread ?

[jymix]

Originally Posted by workaholic_ro

I introduced a (rubber) pipe with a diameter slightly larger than a spark plug to prevent air leakage in place of the spark plug

How do we check if the valves are open or closed?

[rover54]

Two things regarding bent valves.

1. Why don't you just purchase a borascope ( about £10 on ebay) mount it facing upwards on a metal coathanger and insert it throught the spark plug holes and view the valve on a laptop.

http://www.ebay.co.uk/itm/Mini-Water...item19d21556bf

2. Does the engine turn over by hand? If it doesn't lock up take all the plugs out, spin it over on the starter motor and feel the compression by putting your hand over each spark plug access hole. If you have compression then the valves are seating and you don't have bent valves.

Reading your post #2, white smoke normally indicates coolant in cylinders. Does it loose coolant, is it does I would look at the inlet manifold gaskets. Coolant can get into some of the cylinders and can find its way to the injectors via the inlet manifold airways that heat the injectors to help with fuel vaporisation.

[Mike Noc]

A quick test to check for bent valves - you only have to remove the spark plugs and cambelt cover:

With a marker pen put a mark on each cam sprocket and rotate each cam in the correct direction feeling for when you get the valve springs resisting - this is when the valves start to open. Put a mark next to the cam mark on the housing. Put another mark on the housing adjacent to the cam mark when the spring resistance stops ie when the valves are closed.

Then measure the distances between each set of gaps on the housing. If the valves are good they should all be equal. If some valves are bent then the gaps will be shorter than the others because bent valves won't follow the entire cam lift profile.

Mike

[jymix]

Originally Posted by jymix

i chosed the new year's eve to redo the test valve with a compressor, and here are the results:
As regards the rear valve, and the compression is done by rotating the motor reacted anticlockwise.
But with regard to the valves before, i can not get compression. The air starts to escape through the holes in the intake manifold, then the two sparks plug and finally by exhaust ...
I'm turning the engine by hand, i only get that these three steps
what should i do?

All my good wishes for 2013 to all

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[jymix]

Hello,
Nobody to help me?

[SD1too]

James,

I don't want to interfere unnecessarily, but as your usual helpers seem to be unavailable at the moment, here goes.

I think you may be doing the compressed air test incorrectly. Is the cam cover removed? Remove sparking plugs (to make rotating the engine easier). Find the camshaft lobes for the four valves for cylinder number 1. Rotate the engine slowly by hand until all four lobes are pointing upwards, so that the valves are closed, as Kaiser said:

Originally Posted by kaiser

... make sure both inlet and both exhaust valves are closed. That means that all cam lobes must point up, and away from the lifters below. In other words, they must not press the valves down.

Now feed compressed air into the sparking plug hole for cylinder number 1. Does the air escape? If so, from where?

Simon.

[jymix]

as regards the rear valve, the engine response to the air pressure of the compressor by turning

But with regard to the front valves, I can not get compression. The air starts to escape through the holes in the intake manifold, gradually turning the crank the engine, the air then exits through holes spark, and finally the exhaust ...

And yet, I proceeded in the same way as the rear cylinders.
I turned the engine slowly until the piston is the highest. Then I sent the compress air. but the air exits through the hole in the inlet manifold.
actually, I continued to send the compress air while turning the engine slowly hoping to get a complete closure of the valves but without success (air out through the spark plug and finally the exhaust).