Please explain this DF or anyone else.
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Post Fiend
Joined: Feb 2001
Posts: 6,624
Likes: 8
From: Missouri
Please explain this DF or anyone else.
My neighbor just yanked his 289 out of his 67 mustang becasue it was making a serious clanking noise. He pulled the oil pan off and found that the thrust bearing had eaten its way into the crank on the counterweight. Not to hard to figure out that the clearance was not checked or the crank was not whacked forward with a hammer before torquing the mains but here is the funny part. This motor has at least 30,000 miles on it. The bearing wasn't damaged at all. It was wore down to the copper barely but not broken. A bearing is what ate out the crank becasue it clearly shows the groove to be the same thickness as the side of the thrust bearing. The only thing I can think of is that somebody rebuilt the motor with and already trashed crank?? Bearings aren't harder than nodular iron are they? Its just weird. This guy drives like a maniac also so I can't see how the bearing was hardly showing more than normal wear.
Logistics Pro
Joined: Jan 2002
Posts: 4,907
Likes: 39
From: suburban atlanta
Please explain this DF or anyone else.
All I can say is that clock parts made of steel can be grooved/worn away by clock parts made of brass.... I have seen it myself, and have an example on the wall.
I kind of think that if you looked under a hi-power microscope, you would see a very porous surface which was wearing against a lower porosity surface, and one held the lube better....
If this 289 has an auto, I'd be looking for a balooned torque converter.
tom
I kind of think that if you looked under a hi-power microscope, you would see a very porous surface which was wearing against a lower porosity surface, and one held the lube better....
If this 289 has an auto, I'd be looking for a balooned torque converter.
tom
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Post Fiend
Joined: Feb 2001
Posts: 6,624
Likes: 8
From: Missouri
Please explain this DF or anyone else.
His torque converter does wiggle around inside. I think they all do that a little. It seemed to be working okay at the time but if not they aren't too expensive. I am trying to get him to put a higher stall converter in. His stalls out at about 1500 rpm right now. He wonders why takeoff sucks. Thanks for the info.
Cargo Master
Joined: Aug 2000
Posts: 2,931
Likes: 12
From: SW Michigan
Please explain this DF or anyone else.
Rat, I wasn't sure how to explain this, so I asked my Boss. Yes the crank is harder than the bearings. But it is not harder than the dirt and sand that can contaminate the bearing. The bearing surface is soft so that small pieces of grit will get imbedded in the bearing rather than scratching the crank. if there is too much dirt in the engine, or not enough clearance on #3 main, or not enough oil pressure, dirt and sand will get stuck on the surface of the bearing and gradually wear away the crank. The boss says the way I have been setting up engines, with .003-.0035 clearance on the mains, I will never have this problem. Heavy clutches or bad torque converters would cause this problem to show up even sooner.....DF
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