Cummins 8.3 diesel Rebuild Help

Hi,

I have a 1989 Case 1550 dozer with a Cummins 8.3 turbo engine. I have massive blowby and the number six cylinder is dead.

I'm taking off the head, but really don't know what I'm doing. Right now I'm stuck on how to get out the injector nozzle. It's a Bosche type fuel injector system if that helps.

How do they come out? Are they just pressed in from the bracket that I've already removed? Is there a trick to getting them free?

Thank You,
Eddie

Here's the slide hammer I made. Workded great on five of them, but one came apart at the threades. The tip of the nozzle is still in the head.

Any thoughts on how to get it out??

Thanks,
Eddie

Here's what came out on the bad nozzle.

Eddie

let me try the picture again

Number six cylinder was dead. I expected to see a hole in the piston or the head gasket had failed. Nope. Both looked fine.

The taper is huge!!

Number five is also escessive and the other cylinders are probably normal, but there is taper to them as well.

The real cause of my problems is the compression ring broke. The slot fot it in the side of the piston is over double what it should be.

It must have been bad for a very long time!!

Eddie

The injectors came out easy enough with a home made slide hammer except for one. It seperated and left part of itself in the head.

I'll take pictures, but can that be tapped with a hammer from the inside to get it out?

I've lost pieces to it also, so I have a problem there as well. Can the injectors be rebuilt, or is it better to replaced them?

Eddie

Thank you for your help.

I agree that replacing all the cylinders is a good idea and plan to do so. My goal tomorrow is to find a place to rent an sleeve puller.

Are the pistons reusable, or is this a bad idea?

Thanks for the tip on the cylinder head. I've been debating have the valved done, but realize it's the smart thing to do. Just another thing to add to the list.

I'm looking forward to here your tip on installing the head.

Thank you,
Eddie

Thanks, that would be better anyway. Put all new in there and be done with it.

Is there an aftermarket source for Cummins engine parts? Napa or something like that?

Eddie

There's a plastic sleeve that goes around the nozzle- you'll want to replace those. You have to grease up the nozzle to get the sleeve over it, then antisieze the whole nozzle and sleeve so you don't have this problem next time.

I've started cutting up some scrap steel to make a slide hammmer. I'll put some penetraiting oil in there while I'm welding up the hammer.

I'll post pics as I go and see what happens.

Eddie