WTF happened?

WaA420 · 01-27-2006, 10:41 PM

I'm rebuilding this motor for a friend and now I know what was making all the noise.

AA_Ezra · 01-27-2006, 10:46 PM

Whoa that's bad. That engine was hungry. And looks like That green antifreeze likes eating up the headgasket. Hope i dont see any of that when i crak my baby open

WaA420 · 01-27-2006, 11:04 PM

Yah, I've changed many 944 head gaskets and torn apart several other engines and never seen a head gasket close to that fuched up. The previous owner told my buddy that the head had recently been off. I don't think so!

AA_Ezra · 01-27-2006, 11:15 PM

Can you say Time warp

Slam · 01-27-2006, 11:16 PM

If the head had been off it certainly wasn't torqued back up properly! Overheated and warped the head? Probably. Oil cooler seals went? Probably.

Last time I saw a rod bearing that bad was when my wife and I dropped the pan on her 931. I'm assuming that's the #2 journal...

944 Ecology · 01-28-2006, 03:30 AM

Judging by the oil deposits, few oil changes, none with mobil 1.

Lawrence Coppari · 01-28-2006, 05:04 AM

Green antifreeze will eat things if you don't change it every other year. I've used it for 26 years in my older Mercedes. It's been in another car for 19 years, neither with any problem. The PH gradually moves towards acidity as time goes by.

It's all in the maintenance.

924RACR · 01-28-2006, 06:08 AM

Good call, George! I've been amazed at the detergent properties of Mobil1, even on high-mileage engines. I also have switched all my cars over to the orange coolant, even though it tends to get changed somewhat frequently.

Last time I did that to an engine, it was at high revs on a racetrack, locked right up. So, what was the failure mode on this one, just a rod knock?

bryanthompson · bryanthompson's Garage

Once the engine is open, it's total magic-land for me... so i'm sorry for the dumb question that is about to come.

When you change bearings like that one, what is the procedure for shimming and measuring? I helped my grandpa (meaning, I handed to him the tools he wanted) rebuild an inline 6 from a '51 chevy once, but he didn't explain this process. Are shims used, and how do you know when?

ae1969 · 01-28-2006, 09:22 AM

Pretty nasty looking engine........... definitely lack of maintenance.

He did not have many more miles to go before that rod went right out the side of that block.

You will have a lot of cleaning and measuring. Those little chunks of metal are now EVERYWHERE which is a terrbile thing to be running that engine like that.

It seems like he drove it with a knock for quite sometime.

WaA420 · 01-28-2006, 09:42 AM

The head gasket didn't blow around any cylinder but did around a couple head studs and the front water port bolts. This made for a total pain getting these bolts out. When I removed the head nuts they felt like they may have been over torqued if anything.

The main problem with the engine way a flickering oil pressure gauge and a knocking sound. I checked #2 rod first a it's the only one with the problem. The metal chunks are in everything so new oil pump and internal cooler and lots of cleaning.

The nice part is the cylinder walls appear to be almost scratch free.

I'll have to see about the crank though and like some of you said it was just moments from throwing the rod through the block.

cchyper · 03:24 PM

whoever owned that motor, must have been a total wanker.

oh crap. its ME!

I let a friend of mine drive my car, and thats what he did to it... in less than 15 miles. Obviously didnt want to keep it under 6500 rpm.

Time to start some wrenching. to bad i broke my leg last monday, but i got my cast and i am ready to start the build up.

Slam · 01-29-2006, 12:15 AM

Quote:

I let a friend of mine drive my car, and thats what he did to it... in less than 15 miles. Obviously didnt want to keep it under 6500 rpm.

cchyper · 01-29-2006, 01:04 AM

well not all of the damage... just the bearing and metal shards

ilikemy944 · 01-29-2006, 08:11 AM

If your friend did that in 15 miles, he probably had to stop and drain the oil, then hold the throttle at 7000rpm... I guess, that is if you want to blame someone.

cchyper · 01-29-2006, 08:49 PM

maybe so.. do you think it took a long time to get it that bad? i really dont blame hime that much - i knew it was gonna happen one day. I thought that he threw it just by dragging 4 pulls on the freeway with me. I think he must have breached the 7000 mark or hit it numerous times.

ilikemy944 · 01-30-2006, 07:16 PM

I dunno, I have taken my car to 7k a lot.
That may not help, but 4 times to 7k isn't going to do that. Its probably more likely to float a valve. Now, I admit, if my car spun a bearing with someone else driving it... LOL That poor person.... But its probably just one of those things that happened at a bad time for him.

I'm curious - how many miles are on it?

cchyper · 01-30-2006, 10:04 PM

188000 with a rebuilt head. the weird thing is that the motor had been apart before. The rods were from an 89.

mike944 · 02-01-2006, 05:32 AM

You say the rods were replaced? how many miles ago? Were the bearings changed? Were the clearances checked with a plastigauge before assembly?

If the bearings were changed and fitted properly, what weight of oil were you running? was there any coolant mixed with the oil?

7K running shouldn't really affect the bearings, unless the clearances were too far open, or the oil was too thin, or the oil flow to that particular journal was inadequate. Not a good idea to hang around at that rpm for long periods of time, but i would suspect valvetrain problems would happen long before bearing problems.

If you're going to try to save that crankshaft, it'll need to be ground undersize, and you'll need the proper bearing for the undersized journal.

cchyper · 02-01-2006, 07:19 PM

I ran 20 50 oil... and i bought the car with only 16,000 miles on the "rebuilt engine"