330c

It takes about 10 seconds to finish the job on a rod bearing, once the clearance gets to the critical point of not enough oil supply for the rpm/load. The original wear may occur in minutes, hours or over many years depending on the original clearance as installed and the quality of lubrication over the life of the bearing. I expect #3 is just a bit farther from the oil pump or just was unlucky and caught some debris that made it through the system somehow.

I would take the crankshaft and the connecting rods to a good machine shop and they can tell you what is available and what your options are. Chances are your crank may grind to a standard undersize, but the rod may be ruined if it got hot. If it didn't get too hot, it would be a good idea to have it checked and possibly resized and new piston pin bushings installed and honed to size. Aftermarket manufacturers frequently offer higher(lower?) undersize bearings than CAT.

D330C 4B1-up parts book (may not be the same as in a track loader??)

connecting rod bearings-(4 required)
7m7821 standard
2s502-.010"
2s503-.020"
7m7826-0.030"

Main bearings- 5 sets and 2 thrust washers ( CAT calls them "plates")
8S3978 standard
8S3979 - 0.010"
8S3980 - 0.020"
8S3981 - 0.030"

Like I said before, many times aftemarket suppliers will offer greater undersize, perhaps up to 0.050".

Gasket sets
8S9699 basic
8S9702 supplemental
8S9705 valve grinding

Seals
Rear main 5S9022 seal only or 5S6297 seal and wear ring
Front main 5S9021 seal

Crankshaft 5S5252😮
connecting rod 5S2793

Piston ring group (4 required) 7S9404 (consisting of 3 rings--top,intermediate and oil control)
piston pin bushing 7S9348

liners 5s6346 (4 required)
5S6670 o-rings (8 required)

Hope you get a good report😄

LP the block is pretty much the same but the oil pump. front cover, water pump and cyl head are different on the 3304 and the 330 C.
Be sure to get the engine alignment right when you put the engine back in or the drive biscuits will rip out fast.
Later Bob

LP its good to hear that you are putting the effort in rebuilding the old Girl, Bobs mention of drive couplings is for the later powershift loader (951c), I would think your loader is a 63K or U.S. sister with this motor fitted (4 3/4" bore) I would think all the parts for this tractor/engine are still easy to find in the U.K. your crank I would expect to be a Knacker, look for cracks across the crank pin that has failed, (in line with the pin, not around the pin) they are a simple motor to fix and easy to work on, the Lanchester Balance shafts below the crank are easy to time as the sump plate (the flat plate ) has the lock holes in it to help set them to the crank.

tctractors

According to the Cat SNID book the D330C came out in 1968 and was made till 4B4554 and then the 4B at 4555 was the 3304 engine in 1973.

Hi all..!!


Today i decided to give the engine up. It'll get to pricey for the supposed project, as i never intended to put it back into the loader.. If only the crank wasn't that bad i'd rebuild the engine.

Thank u very much ALL for all the input!! 😊