Cat D7 3T-4T crankshaft.

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D74T

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Could I please have some advice on the reliability of a crankshaft that has been rebuilt to standard/standard with hardchrome? It is a crankshaft from D7 3T part no 7B7452.
Thanks.

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Tue, Jan 30, 2024 5:17 AM

Old Magnet

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Hard chrome plating the journals gives the ultimate in wear surface.
There are a few challenges to doing it right, adequate thickness, bonding and minimum voids (expect some). Can be a challenge to get someone to do the grinding to size.

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Tue, Jan 30, 2024 8:33 AM

D74T

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Reply to Old Magnet:

Hard chrome plating the journals gives the ultimate in wear surface.
There are a few challenges to doing it right, adequate thickness, bonding and minimum voids (expect some). Can be a challenge to get someone to do the grinding to size.

Thanks for that information, are there issues with hydrogen embrittlement causing the crankshaft to break in this application?
Cheers.

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Tue, Jan 30, 2024 8:42 AM

Old Magnet

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Reply to D74T:

Thanks for that information, are there issues with hydrogen embrittlement causing the crankshaft to break in this application?
Cheers.

Yes, hydrogen embrittlement is inherent in the process but can be minimized with proper heat treating process.

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Tue, Jan 30, 2024 10:05 AM

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