[mike1967]

check oil pressure

 

[mike1967]

1.5 bar idle hot 3,0bar 3000 revs hot, is what autodata qoute,
could also be the ring on camshafts older cars had metal and they were rubbish , pics below shows new and old type rings,

 

[mike1967]

1.5 bar idle 3bar 3000 revs

 

[mike1967]

could also be retang rings on camshafts

above new type plastic,

above part numbers

above old type rings the ears snap on them when do damage the head and end cap

 

[mike1967]

Depending on how much the end caps and head surfaces are grooved will have effect on lack of oil pressure to control vanos

above was my last refresh i done this one was on the borderline of wear on end cap and head surface notice the groove cut in , below is pic of what they should look like

above is fairly good and really what want to see, 0.5mm of a groove can be enough to stop vanos timing , could try some lucas oil additive or some stem seal additive that makes them swell up might help the rings take up the wear,
below link does both worth a punt

Engine Oil Stop Leak « Lucas Oil Products, Inc.

lucasoil.co.uk

 

[mike1967]

I use a dremel and metal polish i scotch brite coarse pad first then polish them , if you don't polish them they will wear away the plastic new rings it seems, those look very bad to be honest and if that was in front of me i would likely be search for another head by now,
that said I have before cut deeper grooves in 2mm deep and used jb weld to fill the groove back up to flush and its worked got a couple of cars i know of that were give it a go and try to see what happens, I used a round wood sanding block I got made up so stick wet and dry on it and sand surfaces gentle, do not remove anything off the raised parts

 

[mike1967]

no probs devil is in the detail lol

 

[mike1967]

needs refreshing

 

[mike1967]

I was referring for this reply from you on a similar 296B issue

https://www.mini2.com/posts/4507639/

whem installing the crankshaft lock pin there is only one hole in flywheel but can accidently lock in one direction in to a bolt hole ie engine will be 180 degrees out,, way to tell put the rods in number 1 and number 2 spark plug holes and get level then insert the crank pin when locked try and rotate the crankshaft both ways with a bar if wont turn then thats correct lock point but if rotate crank one direction its wrong, worth a check,

i've put more than 18,000 replies on here so when someone quotes one its needle in haystack in my world then add i work best part of 14 hour days normally and come on here in-between everything else i have going on so impossible for me find much more time going back through things, better off telling what it is doing now and any codes, also will need to do oil pressure test with wet gauge, the codes you have one would point me at mis timed exhaust to crank, might find the vanos sprocket is free wheeling, ie the return spring inside has failed possible, the faults you have are so hard to diagnose even for me with car infront of me it takes me a while to test and retest etc rule out things,

 

[mike1967]

That much carbon buildup in the exhaust ports indicates the piston rings are likely worn out too. the oil scraper rings, not the compression rings.

I;m out.

Good luck (sincerely).

totally agree with you, also that much crud in ports cat will be totally done as well

 

[mike1967]

what voltage at solonoid plug ignition on should be battery voltage

 

[mike1967]

lucky it never worn away head surfaces as many do, time will tell i've done that before and few thousand down the road get oil light on idle as when the added camshaft wears its way in it can open up journals and bleed oil this drops oil pressure, hopefully like you said cracks in camshaft