75 replies to this topic

[calgibb]

Thats was my thought if the cam timing was out it would affect all of the cylinders but it is only two of the cylinders, the compression of 1 and 4 are in the expected range at about 120.

I used feeler gauges to set the clearance, checking when setting and after tightening then once again just before re-fitting the rocker cover. Yes but you can physically see the rocket opening the inlet when the exhaust should be opening and vice versa on cylinder 2 and 3, you can see the push rods pushing up in the wrong order which as far as i am aware can't be explained other then by the cam and the head not matching up as we also had a piece of wire which allowed us to see how the piston was working in comparison the the valves and rocker.

[Carlos W]

Remember that the valves on a mini are arranged like this :

EX-in-in-ex-ex-in-in-ex

 

To the OP you've read this ?

[calgibb]

OP? if thats me yes I knew this prior to the post hence why i knew it was pulling in exhaust and out inlet.... and the mechanic also knows that. I have also read this.

[gazza82]

Unless someone has made and fitted a cam with the inlet and exhaust lobes in the wrong place, I can't see how this is happening?

[KernowCooper]

Cal ask your Mini mechanic if he thinks there is a chance the cam lobes have slipped on those 2 cylinders

[calgibb]

Ok thank you both gazza82 and KernowCooper I will ask him when i see him tonight to see what he thinks! I will come back with the findings!

[David128]

Hi I know you have poor compression . but are you absolutely sure you got the firing order right 1342 anti clockwise?

[chrisdev1981]

Warped Head?

[KernowCooper]

We need to dispel any thoughts of the cam having the lobes in the wrong place, and investigate why the compression is low on 2 clyinders next to each other, if the gasket is gone or the head cracked then you would get a certain amount of interconnecting induction and exhaust pulses.

[calgibb]

Yes I am absolutely sure because I had to correct the firing order after a mate who had no clue what he was doing decided to mess about while I was busy working on other bits.
Why do we need to dispel any thoughts of an issue with the cam... As the cam is rotating you can see the push rods pushing the valves to open at the wrong time in comparison to the piston so I do not understand how a crack or a head gasket issue would cause this problem. Obviously that could be another problem down the line but I doubt it's the gasket, the old one appeared in working order but the new one has been in 2 days and the engine hasn't worked in order to destroy it.

[Carlos W]

Yes I am absolutely sure because I had to correct the firing order after a mate who had no clue what he was doing decided to mess about while I was busy working on other bits.
Why do we need to dispel any thoughts of an issue with the cam... As the cam is rotating you can see the push rods pushing the valves to open at the wrong time in comparison to the piston so I do not understand how a crack or a head gasket issue would cause this problem. Obviously that could be another problem down the line but I doubt it's the gasket, the old one appeared in working order but the new one has been in 2 days and the engine hasn't worked in order to destroy it.

 

So the valves on 1 and 4 open as they should, but not 2 and 3 ?

[Dusky]

Maybe you could video the valves opening and closing for us?

[gazza82]

Yes I am absolutely sure because I had to correct the firing order after a mate who had no clue what he was doing decided to mess about while I was busy working on other bits.
Why do we need to dispel any thoughts of an issue with the cam... As the cam is rotating you can see the push rods pushing the valves to open at the wrong time in comparison to the piston so I do not understand how a crack or a head gasket issue would cause this problem. Obviously that could be another problem down the line but I doubt it's the gasket, the old one appeared in working order but the new one has been in 2 days and the engine hasn't worked in order to destroy it.

 

Don't want to sound patronising, but you are counting from 1 at the water pump end .. ???

[Yoda]

sound patronising i do not want

 

BUT

 

turning the engine the right way you are?

 

Go now i will.

[nicklouse]

Why do we need to dispel any thoughts of an issue with the cam...

tell me where you can get a cam that would fit an A series but not work with an A series head?