955H rod bearing

The engine has to come out to remove the crankshaft,it is possible to change the bearings with the engine in,a knock is usually a rod bearing,remove the oil pan and the plate to have a look first,you will have to raise the loader frame up from the hard bar,undo the three bolts securing the hard bar to the frame on each side,remove the two bolts in front of the sprocket securing the loader frame to the track frame,jack up the front at least four inches over the hard bar and block it securely between the loader frame and hard bar,now you can remove the pan and oil pump and plate check the rods,if the shaft is bad the engine will have to come out to remove the shaft for grinding.
AJ

By "changing nozzles" is that with new units? A bad injector can generator the rod knock noise.

That's what previous owner was led to believe; changed all 4 nozzles with new Caterpillar ones.

Hoping that its just dropping the pan, thanks for your experienced answers.
Machine came with Service & Parts & Owners Manuals so reading to do.

By "changing nozzles" is that with new units? A bad injector can generator the rod knock noise.

That's what previous owner was led to believe; changed all 4 nozzles with new Caterpillar ones.

Hoping that its just dropping the pan, thanks for your experienced answers.
Machine came with Service & Parts & Owners Manuals so reading to do.

[quote="Goldigger"]By "changing nozzles" is that with new units? A bad injector can generator the rod knock noise.

That's what previous owner was led to believe; changed all 4 nozzles with new Caterpillar ones.

Hoping that its just dropping the pan, thanks for your experienced answers.
Machine came with Service & Parts & Owners Manuals so reading to do.[/quote]

Since it won't take much effort, put the old nozzles back in just to be sure that the issue wasn't introduced by the new nozzles (unless you're sure that the knock is coming from the bottom end - even injection knock can sound like it's coming from lower down)

I was taught long ago to listen for engine noise by using a long screwdriver or a length of rod and place it behind the ear and the other end on the block, this way you can pinpoint where the noise is located high or low.

If you have bearing flakes in the filter pleats running the engine should be the last thing you need to do, if possible I remove the front bucket then hoist and jamb the loader frame up, remove the front nose group (rad and case) then pop out the engine, it might be worth your efforts to drop the pan and take a look at its innards, but running it might cost you the crank or the block, big ends rumble out a tune (low idle) unlike a capsule that has a knock or tap to it, if you need more convincing about your engine issue whip off the head and check piston travel, the flakes in the filter should tell you that its not a capsule.

tctractors

Dead right TC, that metal, and the whole filter needs further investigation, every time the engine is started from cold, the filter by-pass and lube valve both open and allow unfiltered oil around the system. It can only get worse.

Thanks for everyone's advice - will not start it & remove engine as suggested, attached is picture running with the issue[attachment=27359]Cat.jpeg[/attachment]