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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

torque spec. Caterpillar D4 7U Series

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Steve McNally

11-11-2005 16:54:46




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We are currently overhauling a 1958 Caterpillar D4 7u Series. Does anyone know the torque specifications on the headbolts, rod bearings, and main bearings? Please reply ASAP if you can. Thanks!




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Len Sholes

11-12-2005 13:50:06




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 Re: torque spec. Caterpillar D4 7U Series in reply to Steve McNally, 11-11-2005 16:54:46  
Steve re your request for specs on your D4 engine. Head bolt torque is 70 ft lb for the 1/2 inch nuts and 140 ft lbs for the 5/8 inch nuts if you have the hardened washers and nuts. If not then it is 58 ft lbs and 130 ft lbs. Rods 58 ft lbs minium, bearing clearance .0035" - .0055" max permissible clearance .013". Mains 120 ft lbs, bearing clearance .0048" - .0071", max permissible clearance .015". Valve clearances are intake & exhaust .010" hot. Hope this helps you.

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Steve McNally

11-12-2005 17:06:36




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 Re: torque spec. Caterpillar D4 7U Series in reply to Len Sholes, 11-12-2005 13:50:06  
Thank you so much !



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