Hello friends,
happend again ...
short story:
Oil pump relive valve stuck,
big end bearing fault, crankshaft ok,
please have a look at the pictures,
I found a strange broken ring/sleeve,
the metal surface shines like galvanized brass color,
the outer diameter could be 8mm, I am not sure if these 3 pieces are the only ones?
see Attachement
does anyone have an idea where the sleeve came from?
(https://www.v8forum.co.uk/forum/download/file.php?id=906&mode=view)
long story:
bought the car in very good condition, 3.5 SD1 Engine, SU´s,
engine overhauled by professionell (?) engine builder,
the main block looks like Alu flame sprayed,
after ~ 5.000 km, big end bearing fault,
the relive valve stuck, oil pressure was lost, although I switched of immediately,
the big ends bearing are killed,
crankshaft was ok, like new, I found abrasive sand in the sump,
I am sure the engine builder does sandblast the block, and waste of sand remaining inside the block/blind holes...
I polished the relive valve and the bore, it run pretty smooth then,
full oil pressure!
engine run perfekt for 10.000 km,
last autumn, it happend again, the valve stuck again,
now I bought the "tad pole" relive valve, it should help for the future,
I will clean up and rinse the block gain, every oil bore!
Thanks for your ideas!
Your Frank
V8bigbearingdefekt_010.jpg
V8bigbearingdefekt_011.jpg
V8bigbearingdefekt_012.jpg
Do you use the rubber valve cover gaskets with the steel sleeves in the holes? It looks like one of those, I had one come off during installation and destroy a lobe on my cam shaft.
Hello TR8Driver,
gratulation, you are right!
it is these sleeve out of the rubber sealing oft the valve cover!!!
many thanks!
hopefully my cam ist ok, I will check for,
Your Frank
V8bigbearingdefekt_2002.jpg