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Problems with engine rebuild on 2012 glider

I need to know the difference in rebuild kits part number r23532565 and r23532558. It's a Fitzgerald glider with a Clark Power rebuild, 12.7 Detroit series 60 engine. When I gave the engine serial number to Williams Detroit for the parts to rebuild it, he gave me the r23532565 parts which I've found out are wrong after 90% of the rebuild is complete. My question - what is the difference between these two engine kits - Williams Detroit and Fitzgerald Trucking don't have an answer.

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r23532558 is part number is for just 1 reman cyclinder kit only

r23532565 is part number is for basic reman engine overhaul kit

I hope this answered your question for you.

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Wow! Thanks. You’d think between Williams Detroit and Fitzgerald one of them could have explained that. This explains why everything went back together smoothly so now I’ll quit trying to solve something that’s not a problem. Thanks again.


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My 2015 Fitzgerald Glider had to have the main bearings replaced at just short of one year due to wear metals detected in my oil samples. Less than one year later my sample detected wear once again. My Detroit shop was at a loss as to why it was doing this. They eventually figured out that the wrong size bearings were put in the first time they were replaced. The shop ran the engine serial number to get what they thought were the correct replacement parts but something had been changed in the rebuild. After Fitzgerald and Detroit figured this out they agreed to split the cost of the work.

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Thanks We have it running . Only problem now is I have lost about 1/2 mile per gallon. 2000 miles on rebuild

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Jlktrucking will be eternally grateful.
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