Question about 2002 Jeep Grand Cherokee

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The engine sucked a rod, had plently of oil, no other problems. Drove, parked, started five minutes later and it knocked loudly. I Iive in a very small town (1200 people) and this problem occurred with another 2002 Jeep Grand Cherokee, Ltd. A problem with others?

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In order to determine if your problem is chronic, you would need a much larger field. (statewide survey or larger). You would also need to strip you engine down to bare bones and take careful measurements of all the internal components and document exactly what happened to yours, then repeat that with all other failed engines.It also would be necessary to take and analyze the oil in each one to compare the wear components suspended in the oil as well as the percentage of fuel and coolant residue (if any) in each sample.
Having two similar engines in a small town fail in seemingly much the same way is definitely a starting point to question, but were both failures actually caused by the exact same thing? Did the connecting rod fail or was it a rod bearing? Were both vehicles driven exactly the same using exactly the same oil and were both serviced at the same time?
When manufacturers determine predicted failure rates they look at a large sample. If only 2% of one million engines fail for the same reason, they may consider that acceptable.
The shame of it is that many times even if the cause is simple, many manufacturers do nothing to correct it, especially if the majority of failures happen beyond the warranty period.
Though it would be interesting to investigate it further, You should have a very experienced engine builder look yours over to see what the cause of your failure was. Then use that information to prevent a similar failure in the one you use as a replacement. It may require using a high volume oil pump, chamfering the oil holes in the crankshaft, using a harder or softer aftermarket bearing or just a better oil (like a good synthetic) I can't see your problem so these are just common ideas to consider.
Either way, Good luck

Posted on Jan 04, 2011

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Posted on Jan 02, 2017

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