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04-14-2020, 09:27 PM | #1 |
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Join Date: Sep 2011
Location: Christchurch New Zealand
Posts: 1,611
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59a Engine Failed Big Time. Crankshaft journals
Since engine failure have now stripped out all bits from block.
See attached pics of con rod journal surface at crank 1& 5. The radial groove appears to be in the casting and not the result of damage. Generally the c/shaft con rod surfaces were not good, 2& 6 had surface pitting, mains not bad but all really needed as grind. Con rod bearings rather worn and well out of max wear specs. My question is would this groove as above be ok with a grind to bearing surface. Existing con rod bearings from here were similar to all the rest as removed, no noted irregular surface damage in way of this groove. 59 a Engine Fail March 8th 2020 048.jpg 59 a Engine Fail March 8th 2020 052.jpg Top pic : 1 & 5 Lower pic: 2 & 6. Phil NZ Last edited by Phil Gillespie; 04-14-2020 at 09:30 PM. Reason: correct quotes |
04-14-2020, 09:34 PM | #2 |
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Location: upstate SC
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Re: 59a Engine Failed Big Time. Crankshaft journals
does look like a bad casting from the factory. as an old mechanic told me just holds more oil
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04-14-2020, 10:00 PM | #3 |
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Location: North Pole, Alaska
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Re: 59a Engine Failed Big Time. Crankshaft journals
I think Mart would just run it!
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04-15-2020, 06:56 AM | #4 |
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Location: Alabama
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Re: 59a Engine Failed Big Time. Crankshaft journals
I would have crank reground and run it. If that divot ran across the journal instead of around it I would probably not .
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04-15-2020, 04:11 PM | #5 | |
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Location: Christchurch New Zealand
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Re: 59a Engine Failed Big Time. Crankshaft journals
Quote:
At least now after a measure up and surface inspection I now know the reason for very low oil pressure. Excessive clearance at all bottom end bearings. Pins on average worn 3 to 4 undersized along with worn bearings. Phil NZ |
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04-15-2020, 05:16 PM | #6 |
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Re: 59a Engine Failed Big Time. Crankshaft journals
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Lawrie |
04-15-2020, 07:20 PM | #7 | |
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Join Date: Sep 2011
Location: Christchurch New Zealand
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Re: 59a Engine Failed Big Time. Crankshaft journals
Quote:
Phil NZ |
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04-15-2020, 10:16 PM | #8 |
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Join Date: May 2010
Location: Northern Neck, VA
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Re: 59a Engine Failed Big Time. Crankshaft journals
Since the groove is circumferential it will be OK to regrind and use. The bearing load capability will be reduced slightly (when the load is directed on that area) but not by enough to worry about.
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