Granaded s52... help appreciated

[etxxz]

^^ well thank you. i got it yesterday. Houston, we have a problem!

the OPN did indeed fall COMPLETELY off... and because i didnt know, i lapped like this AND troubleshooted the engine like this. I'm installing gauges, lesson learned F*****!

pictured as well are the bearing surfaces. The crank is smooth, but look at it. The bearing surfaces also look the same. The con rods *bearings* do have a more defined friction marking, although the crankshaft surface doesnt show wear.





Since i know nothing about these surfaces other than they are nice and shiny, how should i interpret this? Is machinning/resurfacing req or can i slap new bearings on them and call it a day? I'll start taking off the head today. Too bad i gotta go to CA all next week on business. I don't know if anyone here works(or is into) fuel cells. There's a badass seminar and conference in Palm Springs.
.

-etxx

[jahnaboi]

Hope you get that engine stand soon. If you were local I'd let you borrow mine as its just sitting under my garage cabinets dismantled and getting dusty.

Looks like you're literally 1 step away from seeing if this motor is salvageable or not. Hopefully it is.

Keep us updated!

[etxxz]

thank you, but not a chance man.

Oil starvation under hard cornering?

have not experienced something like this in two years of track. something must have changed.

That blows man. Good luck with the diagnosis.

Deff. get to the bottom of this and figure out what caused it.

100% i'm taking no chance if decide to rebuild this engine. i'll throw it out if i find too much damage.

my friend didnt come through with the engine stand. i managed to remove the engine, get the tranny/clutch/fly, headers etc etc off to be able to look at the valves and prep for the dismantling.

the valves ALL look the same.. intake and exhaust. so either they're all bad or they're all good... this probably doesnt mean anything at this point. ex. that my valves are good. The exhaust valves have white deposit on them, like charred up oil/fuel, but a quick scrape with a toothbrush, the polish finish is revealed. This maybe good news. Haven't had time to look at the spark plugs and oil filter, i'm going to sleep. I work 8-10hour days.

upon taking off the exhaust i noticed that my resonator's baffle is floating in its casing completely broken off. This is a potential exhaust restriction. Probably a major one since my pass side floor boards were getting very hot. All this heat is bad news for the tranny that sits right next to this resonator :D. I don't have money to just make a new exhaust. I'll just cut it off and weld a pipe in its place..

no news on the OPN yet. some pics to enjoy meanwhile.


finishing up the race weekend


thanks for the help fellow r3vers.

[slo325i]

My ca18det did this two years ago...

You're gonna need a new block i think.... one of the oil passages are clogged man...

It could be over-use of RTV or some kind of gasket material....

Good luck man...

[Brew]

Why only 7qts of oil? My M50 takes 8qts...

Do you have an oil cooler? The e34 525i calls for 5.75 L/6.1 qts. I usually do 7 qts in mine and thats slightly overfull. Wonder if you have the wrong dipstick..

[SamE30e]

Oil starvation under hard cornering?

[e30polak]

That blows man. Good luck with the diagnosis. :(

[Jean]

Deff. get to the bottom of this and figure out what caused it.

[etxxz]

^^ bummer. atleast you know where the problem is.

Doesn't sound like a pump nut to me, because if it were both of them should be bad, and by putting oil in the sump won't do anything once you start driving if the nut were off, would just get louder. I think you got a bigger problem, like possibly something causing the oil to not be getting to the top. Hows the bottom look, any spun bearings? If you ran it w/ no oil pump then your more than likely going to have several of them spun. I would for sure check all of that before I ran it again.

my thoughts exactly. That OPN may still be on there and something can be causing blockage. The back of that exhaust cam (the last lobe) and the front (cam gear) are both drenched in oil. I want to understand oil delivery of this engine.

I will be extracting metal deposits in my oil pan this wed. Its good to have friends with hoists and engine stands

[nmlss2006]

Welcome to the club - as I posted elsewhere on r3v, I just grenaded an 'unbreakable' S50 right around the 115kmi mark, two weeks ago. Rod #1 bearing seized, spun and that was all she wrote. Noone can explain WHY it happened.

[318isbmw]

Doesn't sound like a pump nut to me, because if it were both of them should be bad, and by putting oil in the sump won't do anything once you start driving if the nut were off, would just get louder. I think you got a bigger problem, like possibly something causing the oil to not be getting to the top. Hows the bottom look, any spun bearings? If you ran it w/ no oil pump then your more than likely going to have several of them spun. I would for sure check all of that before I ran it again.

[etxxz]

Why only 7qts of oil? My M50 takes 8qts...
Sorry to see this happen. Sucks, but I have been through it also.

on a side note. I have 99k S52 cams and trays if your interested. :)

pm'd

at 7.5qts i'll start making white/brownish smoke. I used to fill at 6.5 and said wth, half a quart more won't hurt.

Post it on the track forum at bimmerforums. That's a damned strange lubrication failure.

Do you have a clogged oil passage?

That's a great idea. I posted on the e36 M3 subforum at bimmerforums with some good replies.

The OPN keeps popping up and Matt knows his stuff.

http://forums.bimmerforums.com/forum/showthread.php?t=1341595

I will try to get the engine on a stand this week. Its far too easy to remove, and far easier to work on that way.

[jahnaboi]

Man that blows. It completely boggles my mind as to what caused that. Obviously low oil pressures could cause that.

My theory is that the nut possibly came off or already did come off and that hard bump/rocky situation going off the course on 3 wheels caused the sprocket to jump off the teeth of the spline (of the oil pump). After wards you added half a quart of oil / extra oil. Considering the characteristics of oil, and the fact that the intake cam did have a oil splash cover, it retained the oil longer than the exhaust cam, which caused the exhaust cam to heat up a lot quicker resulting to the expanded lobe/cracked cap.

Best advice is what everyone else has been saying. Take it apart and check it thoroughly. Sigh...

[nrubenstein]

Post it on the track forum at bimmerforums. That's a damned strange lubrication failure.

Do you have a clogged oil passage?

[e30s52]

Might help I do mine on a left and most people do theres on the ground. ???

Anyways OP I sent you a PM.

I have a lift now ;)