Reply With QuoteThat'll polish out.
Grand Master
PS this is why I replaced the head... :o)
Identical cracks on 4 & 5
Major Contributor
That'll polish out.
1997 535i V8
5spd, OBC, A/C, cruise, BMW phone, factory M-Tech wheel & suspension, 18" Alpinas
Grand Master
hahaOriginally Posted by DaveVoorhis
Green Beret Special Ops
is this from over heating?
95 E34 530I V2.37
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Those who make peaceful revolution impossible will make violent revolution inevitable.
John F. Kennedy
Grand Master
I think so - the thermostat blew and it overheated a couple of months before it blew.
This head has a seriously crap design - it's been pushed too far - only having such a small amount of metal beween the edge of the bore and a water port is shocking. No wonder this particular engine has a reputation for going bang.
They fixed it somehow on the vanos engines though.
2 Grand Master
Out of interest, What cylinder is that? I have a theory about #5..........
Thanks for the cool pic
Dave M
10/90 Build 525im, 630,000+km, Eibach/Sachs, Engine Rebuild
*RIP Oskar the DOG*
Grand Master
I think #5 was the one that was ejecting oil and water when turning it over with the spark plug out - either that or it was 4. Amazing water pistol.
That crack runs all the way up into the cam area.
I've got some more detailed photos of the rebuild process if I can find them. (I've just rebuilt my pc and everythings archived.)
Oh, this is what it's doing to the plugs in #3
Major Contributor
It's making Chicken curry?!
Side note : Boo on +4 plugs. I've got some horror stories about their aweful design and their even more aweful labor claim rulings.
"Scarlet" `97 540/6 with sleepy mods.
"Box Car" '87 535isA - Old School Charm, new school Flair
Big Time Poster
Thanks,,, now I'm getting hungryI think #5 was the one that was ejecting oil and water when turning it over with the spark plug out - either that or it was 4. Amazing water pistol.
That crack runs all the way up into the cam area.
I've got some more detailed photos of the rebuild process if I can find them. (I've just rebuilt my pc and everythings archived.)
Oh, this is what it's doing to the plugs in #3
5-10 Grand Master
no they didn't, the vanos head and non vanos head crack on #4 or 5 in that exact spot with equal vigor, and on rare occasion they crack between the exhaust valves (had one that was cracked between every exhaust valve on every cylinder), i don't really see any real differences between m50 m50tu and m52 heads that they couldn't be interchanged and just use the correct cams to make it vanos or non vanos, i've done so many m50/52 heads i couldn't wager a guess closer then a few dozen
all america wants is cold beer warm cat and a place to take a poop with a door on it
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