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Ex-Nazi
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2,213 Posts
Discussion Starter · #1 · (Edited)
What would you do? Hurt Motor **Pix of Damage**

Friday night driving the car around and I was coasting up to a stop sign, heard a noise like a belt squeal. I was damn sure it was a belt squeal but by instinct I looked at the oil pressure, ~50psi, plenty of fuel pressure so all good there. At the stop sign there was an intermittent squeak/squeal and I rolled out and down the road a bit till the squeal (still intermittent) lead to one slight tap.

Pulled over and popped the hood, there was a light, very intermittent tap coming from what seemed like the top end of the motor, decided to baby it back to the shop, during which I had no problems and no noise. Got to the stop and let the car idle for a few minutes with no noises whatsoever. Hm. next morning I idled the car for a bit and the tap had turned to a bit louder intermittent rattle which shook the engine, still sounding like it was coming from the top end of the engine. The exhaust sounded a bit too "poppy" as well, or at least so it seemed. The rattle very much reminded me of when a cylinder is misfiring and it throws the engine off a bit. Also with the slightly different exhaust it was making me think possibly a rocker had worked itself loose and there really was a cylinder not working right.

Yanked all the plugs, all was well. Pulled the valvecovers and all the rockers are fine. No debris in the valvetrain area, all seemed fine. Went ahead and rinsed the valvetrain with cleaner and drained the oil, front sump didn't show anything, rear sump however has a magnetic plug and I found this:

http://img135.imageshack.us/my.php?image=img0978wn7.jpg

Ran a magnet through the oil I had drained, no debris. Poured the oil out of the filter over a magnet, no debris. Have yet to cut open the filter but I'm not sure if I'll get anything.

I have only put about 600mi on the car, had regular Valvoline oil in it for the time being. Was going to swap out for good synthetic at about the 1000mi mark.

What to do? Tear it down and go looking? Throw it back together with some good oil and see what happens? My thinking, if it's hurt I have to tear it down. If I hurt it more I have to tear it down. Blah!

Forgot to mention, was just cruising when it happened, hadn't dipped in the throttle at all. Car had been parked for a couple weeks as I was waiting on suspension parts and there was nothing wrong when I parked it.
 

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3rd Gear
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153 Posts
tough one, I guess I would be inclined to tear it down before it causes any more damage. Did you build the motor yourself?
 

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Ex-Nazi
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2,213 Posts
Discussion Starter · #3 ·
No, some Albuquerque Automotive Machine or something. Came out of a car I bought.

I know it's likely bearings.
 

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5th Gear
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2,026 Posts
Is it possible that there was metal debri from the machining and that is what you are seeing in the rear sump?

Of course I would probably start tearing things down as well.

Good luck.
 

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Do you even lift?
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3,627 Posts
Put some thicker oil in there, if the sound goes away, give it hell until you spin ever bearing on the bottom end. Your gona have to take it all apart anyways.

I recommend 80w Gear Oil!
 

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Ex-Nazi
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2,213 Posts
Discussion Starter · #7 ·
Is it possible that there was metal debri from the machining and that is what you are seeing in the rear sump?

Of course I would probably start tearing things down as well.

Good luck.
I had the engine out when I first put the car together, drained all the oil and the plug was perfect when I put it back so this is my doing somehow. Just wondering how severe.

I'm basically not wanting to have to tear the bitch down, it gets after it for how simple it is!
 

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AKA hondaman
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1,346 Posts
I would say if it was a r block or some other "nice" block go looking right away but if its a stock block blow that shit up. lol hell I will give you another 5.0 block
 

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FUCK FOURLOKO!!
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10,258 Posts
I would say if it was a r block or some other "nice" block go looking right away but if its a stock block blow that shit up. lol hell I will give you another 5.0 block
I'll remember that you have a spare around:driving:
 

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Ex-Nazi
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2,213 Posts
Discussion Starter · #12 ·
Well Taylorkdt has a spare shortblock as well and I wouldn't be so hesitant to just run the bitch except that yeah, my block is just a regular 5 liter block, but the rotating assembly is an all forged Scat/Probe stroker setup. I'd hate to have a bad bearing and hurt that nice SCAT crank.

Goddammit.
 

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AKA hondaman
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1,346 Posts
Well Taylorkdt has a spare shortblock as well and I wouldn't be so hesitant to just run the bitch except that yeah, my block is just a regular 5 liter block, but the rotating assembly is an all forged Scat/Probe stroker setup. I'd hate to have a bad bearing and hurt that nice SCAT crank.

Goddammit.
Very good point.
 

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FUCK FOURLOKO!!
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10,258 Posts
You are just screwed into doing alot of work one way or the other.

Question is how much do you want it to cost?
 

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Registered
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706 Posts
Buff, the "squeal" you heard was more than likely a bearing spinning, I hope not, but they sometimes squeal when they spin, then a knock follows shortly after, I hope I'm wrong.
-John
 

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Registered
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61 Posts
Well that sucks! It does not take much to hurt any motor, built or not. Yup time to pull it out again :( Will be cheaper in the long run.
 

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Ex-Nazi
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2,213 Posts
Discussion Starter · #20 ·
So tonight I said to heck with it, I put in some 50 weight race oil and threw the top end back together, then babied it up the street and back.

On startup there was a small squeak (which made it 100% obvious to me that it's a bearing) and then everything was quiet, during the drive it ran fine, idling in the shop before and after the drive it seemed Ok.

Seems to be the going advice though is to tear it down. Blah. :(
 
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