14 replies to this topic

[JonnyBMX]

so ive replaced my headgasket and put everything back on as usuall.... only to find that cyliders 3 and 4 are not firing, there is a spark on the plugs.

any one got any ideas? the headgasket appears to have sealed fine as no water has gone into the oil or gone missing from the radiator

thanks guys

[sonikk4]

Do a compression check to make sure all is well , then go from there.

[JonnyBMX]

yeh ill do that tomorrow i did notice after taking the head of for a second time ( i have used another new BK450 headgasket) that the inlet for those two bores (my mini is SPI) was really like "wet and black" where the other is nice and clean... not sure how this could have happened as the car was running fine b4 i changed the headgasket apart from watery oil ahah

[JonnyBMX]

Anymore ideas people?

[longbridge4life]

Might sound silly but check your firing order spark lead connections :)

[JonnyBMX]

Yeh I have em labelled up 1 to 4

[Yoda]

Like Sonik said, do a compression test on all four cylinders. Did you reset the tappet adjusters correctly? and how do you know it is 3 and 4 not firing? by pulling the leads off the plugs?

[leroy26]

and gone from the radiator end first?

[Yoda]

Hang on a minute, are you not the guy who tried cleaning his engine with something abrasive like sand or scouring powder? This little bit of information should have been included in your opening post.

Come on Sonik, i think we know what the answer is here! see you down the pub?













(i know it was a wind up before you say anything)

Edited by Yoda, 08 September 2012 - 07:38 AM.

[JonnyBMX]

Awkwudly I did post saying I had done that I hadbt lol! Problem is now fixed anyways had compression, quite embarringly two of the rickets were the wrong way onto the shaft so wernt sitting on the valves correctly none the less all sorted

[Yoda]

Whats a ricket? i need to know so i dont make the same mistake in the future! I usually make sure my rockers are on right though, i assume thats similar LOL

[tiger99]

How did you manage that amazing feat? It is not normal to dismantle the rocker shaft assembly during routine maintenance or even a gasket change, only if the rockers and their shaft are worn. In quarter of a million miles in Minis and numerous head and valve jobs, plus a few failed gaskets, I don't recall ever dismantling the rocker shaft assembly as there was just no need.

[JonnyBMX]

There was a need the entire reason for changing the head gasket was due to the rockers being changed for 1.5.1 as I said all sorted now

[tiger99]

Yes, that explains why you would need to dismantle the rocker assembly, and the gasket would follow because you have to remove some of the head nuts to get the rockers off. I suspect that you had to fit alternative valve springs to suit the rocker ratio too.

Please do tell us how much more performance those rockers give you, once you have had it out on the road. I hear conflicting stories about what they achieve.

[JonnyBMX]

erm, i have a SC typhoon ECU which is going to be prgrammed to suit for now though the standard ecu is back on... seems to have sorted its self out after a few miles (which was to be expected) cars running beutifully now... on a side note just took the gearbox outa an ibiza to find that it was actually the driveshaft inner cage that had shattered lol! waste of time (y)!