Posted by Destroked 450 on May 29, 2018 at 10:57:39 from (173.242.142.14):
In Reply to: Two Piece Crankshaft posted by Destroked 450 on May 28, 2018 at 15:00:43:
Quoting Removed, click Modern View to see
Line bore is fine, main web is ok, no damage to cap or bolts.
Slight abnormal wear on the front main bearings, no visible difference between the #1 rod bearing and the others.
Main bearings on the left are from the front main and show some abnormal wear on the outer edges compared the #3 main bearings on the right.
If the replacement crank was .010 under I'd reuse these bearings, but it's standard so new bearings where needed.
What we don't know is when the crank broke, the first indicator was 4 months after the rebuild when running the decaker in the poultry barns, the warning light blinked on and back off a couple of times when the engine was idled down.
The oil light would blink when the engine was idled at random times over the next few years and I suspected a possible defective sending unit. These engines Never have oil pressure issues or crank problems.
While tedding hay at low rpm's the warning light blinked a few times so I decided to connect a mechanical gauge just to confirm the sending unit was going bad.
Oil pressure was lower than it should be at idle so I left the gauge connected to monitor the oil pressure.
Cold pressure was 75 psi, after the engine had warmed up pressure dropped to 40 psi at operating speed and 20 psi at idle, again lower than it should have been but not alarmingly low.
Next time we ran the decker is when we knew for sure there was a problem, this machine works the tractor hard and after a while oil pressure dropped to 25 psi at operating speed and 10 psi at idle.
When I drained the oil and dropped the pan to look for a problem I was totally shocked to find the crank broke.
We put over 300 hours on the engine from the first time the warning light blinked until I dropped the pan to find a broken crank.
Since everything in the engine was in excellent condition other than the crank I can only suspect the crank had been broke the whole time.
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