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The problem is with cylinder 3 and 4. When the car came in I had very low compression on these two cylinders - I replaced the valves and seats
( using a specialist shop). The pressure test is now around 180 psi.
However with the manifold removed and cranking the engine there is a leak through the valve ( exhaust ) in cylinder 3 and inlet in cylinder 4.
I have fitted new hydraulic lifters in these cylinders only. Also when testing the engine oil pressure I have really low pressure - the red light does not show red but the pressure reading is almost negligable.
There is no wear on the cylinders and there does not appear to be any excess movement in big bearings etc .
This is a VW 1.6 fsi petrol engine. The rocker cover houses the two chain driven cam shafts. With this assembly removed there is no variation in leak down between any cylinder - the leak down is gradual and consistent into the sump.
With the cam shaft assemblly in place(and the lifters bled) the car will start
and run fine for say 30 seconds as the valves clatter waiting fro the lifters to fill. Now gradually the car starts to miss on thse two cylinders to the extent that the car will not idle. Removing the spark from cylinder 3 and 4 makes no difference to the car at this stage.
When the engine starts the "clattering" sounds as the lifters fill and the car runs on all four for say 30 seconds. Then the "clattering" sound disappears
( as as the lifters fill, I assume) but now the engine starts to gradually miss. This missing becomes worse to the point that the engine now only fires on cylinder 1 and 2.
On checking engine oil pressure I have now found that engine oil pressure is almost non existent - though the red engine oil light does not show.
Are you saying low oil pressure is my problem?. The lifters are fine until they fill.
I have removed the sump and cleaned out all sludge, have cleaned relief valve, filter and pipe etc and refilled with new oil.
When I tested the oil pressure it was found to be almost non existent.
I thought low oil pressure would prevent the lifters from filling.
When I take out the lifters they are always rock solid.
This is strange. I have worked on all makes of plant and cars for more than thirty years and have never replaced as many parts to no avail.
It will take a week or more for me to get the oil pump and get it fitted.
Can I come back to you then or does this become a new question and a new charge then?
Fitted new oil pump and gasket at timing chain side cover. Still have almost no oil pressure. This is a petrol 05 reg VW 1.6 fsi.
Do you have any idea where the oil could be getting lost?
Do you know if there is any type of relief valve built into the oil filter housing?
There is a horizontal hole that seems to lead back into the chain housing from the oil filter housing. Could the oil be getting back into the sump from here.