We are doing an overhaul on our ISX engine. We have the repair manual, but it does not contain certain specs. Can you

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Customer: We are doing an overhaul on our ISX engine. We have the repair manual, but it does not contain certain specs. Can you help? We need the specs for the crankshaft main bearing journal (diameter of a new one with the wear tolerance), rod bearing journal (same as previous). We also need the specs for the camshafts including the 7 possible specs for the injector cam AND for each lobe, plus the 7 possible specs for the valve cam including the spec(s) for the lobe. Hoping to get the original journal diameters then the wear tolerances.

We also thought Cummins might have a book for these kind of specs that we can get. That would be even better. Please respond ASAP.

Thank you for your time,
Jed & Karrie Shafford
Owner Operators of a Cummins ISX since 2001 (960,000 miles!!)
Answered by Buddy in 30 mins 13 years ago
Auto Mechanic

664 satisfied customers

Specialities include: Auto Body Technician, Heavy Equipment Repairs, Diesel Engine Repairs, Brake and Transmission Repairs

Hi there Jed and Karrie Shafford. My name is XXXXX XXXXX I will try and help yall out. I cant post it all in one post for some reason . I will just keep adding . Thanks again

Measure the outside diameter of the seven valve camshaft bearing journals.

Valve Camshaft Bearing Journal Outside Diameter

If the camshaft journals are not within specifications, the camshaft must be replaced.

Buddy Taylor39974.7663572106

Crankshaft Connecting Rod Journal Outside Diameter

mm in
93.98 MIN 3.700
94.02 MAX 3.702

Measure the crankshaft main bearing journal outside diameter.

Crankshaft Main Bearing Journal Outside Diameter

mm in
126.98 MIN 4.999
127.02 MAX 5.001

If the crankshaft main bearing
Measure the seven injector camshaft bearing journals.

Injector Camshaft Bearing Journal Outside Diameter
mm in
84.987 MIN 3.3459
85.013 MAX 3.3469

All i can find is specs, not the original diameters. Thanks again

Here is service manual with part # XXXXX you are interested. Thanks again. Service Manual (3666239)


Thanks for the manual number, I'll see if it matches our book. Plus on your second post you didn't quite finish a sentence. If the crankshaft main bearing --- what? Could you finish your thoughts. I have an idea, but do not want to speculate. Thank you!!

Hi there Jed and Karrie Shafford. I was gonna say if crankshaft is out of those specs it will need to be replaced. Same thing on camshaft also. Another thing also is here is cummins site to check out . https://quickserve.cummins.com/info/index.html . You can go down to create a account. They have a free account and a preferred customer account. It would be worth your time to check that out. Get manuals online and so on. Again thanks. Have a nice day.
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