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How would I find a serial number for my 4bt

936 Views 16 Replies 4 Participants Last post by  char1355
I have figured out the CPL # 0858 with help from here. But I do believe that the serial is on the info plate correct? Mine is gone how else would I figure the serial?
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I may be able to help you some. CPL 0858 was a very common one used in road vehicles. There were different specs on certain parts depending on application. One version came on the Ford E350 vans. Generally, you will see it with a top mounted turbo and a belt driven vacuum pump. It would have a transmission adapter with a small block Ford bolt pattern and a flywheel for a manual transmission. The GM units came in 2 designed. Both those version will usually have the turbo mounted in a low rear position. That turbo tend to have a different sized turbine housing. Normally, no vacuum pump on those. The transmission adapter is a standard GM on both versions. The difference is one come with parts for the TH475 that was found in GM P30 van. Maybe 10% of the vans had a manual transmission and those have a GM flywheel. Have you got a photo of your engine? If you can tell me which engine style you have I have ESN's for them. If the data plate is missing from the front gear housing, the engine serial number (ESN) is sometimes stamped on the rear of the block just below the head. This happens only when Cummins has rebuilt the engine. You mention the CPL and the injection pump can give a clue to that number. CPL 0858 changed injection pumps a lot over the years when it was produced. There were about 8 or 10 different numbers for that CPL.
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No, bearings are pretty much universal unless the crank has been reground. To determine that you'd need to measure main and rod journals. That is one reason Cummins wants the serial number in case the engine has been rebuilt previously. If there was a serial number on the engine it would be stamped on the block just below the head on the rear. That would only be there is Cummins had rebuilt it. If you can measure the crank journals I can give you the part number for bearing sets. You will also need new rod bolts as Cummins doesn't recommend reusing those. There are also bushings in the pin end of the rods that you may or may not replace. On a full rebuilt those are usually replaced and sized to fit the piston pins. There are also front and rear wear sleeves for the crank in case those surfaces have been damaged. Main or rod bearings come in standard, .25mm, .50mm, .75mm. and 1.00mm oversizes.
That number on the engine won't help. Which injection pump do you have? From that there should be an ID plate on the pump that has a series of numbers. From that we can probably narrow down the CPL of the engine and find you a serial number you could use to buy parts. If the engine has been rebuilt you would need to measure rod and crank journals to be sure what size bearings are needed.
Here's a photo of a VE pump where you can see the ID plate.
Gas Motor vehicle Auto part Nut Machine

Here is one type of ID plate.
Font Material property Circle Metal Number

You see the number there 394 6371. That is a Cummins part number 3946371. Gives you something to look for.
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Assuming this is a road engine, the only CPL's with piston 7163 were 0857 and 0858. CPL 0858 was one of the most common ones. CPL 0857 was one with the aftercooler and it's not common. If you can get a look at the injection pump I might can narrow it down. CPL 0858 used a number of injection pumps. Ones that I know of were 3911242, 3914924, and 3917530. Also, is your turbo mounted in a low rear position or a top center one?
Then you have a CPL 0858 which was one of the most common 4bt engines. If the engine serial number isn't stamped on the back of the block just below the head there is no way to know your specific serial number. If there were a number there it would mean Cummins had rebuilt the engine at some point in time. Here is a serial number 44541365 you might use to look up parts. It has injection pump 3917530 and came in a Chevy P30 van with automatic transmission.
Unless someone has changed it your transmission is not a TH400. It's a TH475 which is a heavy duty version of the TH400. Power brakes on those vans were usually hydroboost running off the power steering pump. If you lose power steering you lose brakes too. Makes for a fun ride on a steep down hill. LOL. And 50 MPH is pretty much top speed with 3 cylinders or 4 cylinders. Those vans weren't designed as highway cruisers.
You probably won't be happy with the 700. 4bts eat those for lunch and spit them out. Have to remember that is only a TH350 transmission with OD. It won't live long with the 4bts torque. About the only GM transmission that has had any success on a 4bt is the 4L80e or the 4L85e.
Do you know which rear is in the van? Since you aren't concerned with a 4x4 there is probably a good selection of gear ratios. Seems like some of those vans ran a Dana 70HD. Others may be a 14 bolt GM or even a Dana 80.
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