main bearings

[pwDave]

out of the four mains in a BB chrysler other than no. three, where does the one odd part no. go? I used to know but have forgotten. I'm thinking it was one or five. if someone knows please pipe up. thanx for any help ahead of time. Dave.

 

[69Bee]

I would have to consult my catalogs on Monday if you provide the part number, but I believe it is position one. Online, Federal Mogul shows position 1-2-4-5 as all being the same part number, and Clevite online shows multiple part numbers, so I would have to consult my catalog.

 

[Badvert65]

That is weird. Out of the dozens (and dozens) of big blocks I have rebuild, I have never seen what you describe. It has always been 4 identical shell sets and one thrust shell. Anyone else seen this?

 

[WP29440SE]

That is weird. Out of the dozens (and dozens) of big blocks I have rebuild, I have never seen what you describe. It has always been 4 identical shell sets and one thrust shell. Anyone else seen this?

same here, the thrust bearing is the only one that is different, ive built a bunch

 

[pwDave]

after about 45-50 min. sifting thru my 1971 chrysler shop manual, on page 68 of section 9 under the heading "crankshaft main bearings" it says, the number one UPPER main bearing is NOT interchangeable and is chamfered on the tab side for timing chain oiling. now to call my machine shop guy and see if he used the right bearings for the fit-up of the crank. Dave. thanks for the responses.

 

[Hemirunner]

I'm betting he used an aftermarket set that are all the same, if he used any at all.

 

[pwDave]

I'm betting he used an aftermarket set that are all the same, if he used any at all.

Hemirunner, I checked the two sets of old mains that have been in the shop for a while, no difference with those, I have not unwrapped the clevites that the machinest used to set up the crank. the stroker kit is a 440 Source kit, they sent clevites with it. I'm hoping, seeing that they are the oridginal suppliers that they will have the right pieces. on a side note, the bearings that I took out of another engine had the odd part no.(one digit off of the other three) but try as I might, I could not distern any difference from the other three shells, they were fedral mogal. if I find that elusive shell tomorrow I will post up. I know they at least used to exist, I've seen'em!!

 

[bm02tj]

Just looked in a Clevite 1971 master catalogue and the 413 used a different bearing front journal bearing in 1962 on Plymouth and 62 63 on dodge and Chrysler
the 361 383 & 440 are all the same except thrust
Bruce

 

[69Bee]

I have seen them in the past too. What we more than likely have here is a consolidation of different processes to make the bearings in order to increase their profit margin by reducing the amount of different bearings to make. If the #1 upper has a larger chamfer, then make 1-2-4-5 all the same, and the additional chamfer on the other bearings won't matter.

I just checked my 1968 National Service Data book, and they provide the following:

"Upper and lower halves are not interchangeable. On 383 and 440 engines, the No. 1 upper half is chamfered on the tab side for timing chain lubrication ( insert has red mark on edge). Do not interchange."

 

[Cranky]

And there are two different thrust bearings too. Early and late but don't remember what year when the break occured. The later blocks used a wider flanged bearing and it won't fit the early blocks....

 

[69Bee]

And there are two different thrust bearings too. Early and late but don't remember what year when the break occured. The later blocks used a wider flanged bearing and it won't fit the early blocks....

Clevite MS-877P 1959-1973 Small flange 3.555"-3.675" Max dia. (sub Sealed Power 4924MA)
Clevite MS-1277P 1974-1980 Large flange 3.930 max dia. (sub Sealed Power 2025MA)

 

[pwDave]

Mains

I have seen them in the past too. What we more than likely have here is a consolidation of different processes to make the bearings in order to increase their profit margin by reducing the amount of different bearings to make. If the #1 upper has a larger chamfer, then make 1-2-4-5 all the same, and the additional chamfer on the other bearings won't matter.

I just checked my 1968 National Service Data book, and they provide the following:

"Upper and lower halves are not interchangeable. On 383 and 440 engines, the No. 1 upper half is chamfered on the tab side for timing chain lubrication ( insert has red mark on edge). Do not interchange."

and I just checked my 1960 shop manual and the darn thing says and I quote,"there all the same except the thrust bearing, 1,2,4,5, all interchange, Go figure? Dave.