Motor locked up?

[4thesporty]

I had to order bolts for my engine stand. They were supposed to be here Friday, but UPS changed the delivery date to Monday, so......the engine tear down and diagnostic will have to wait till next week.

I'll survey the damage, then decide if I want to just scrap the thing and find another engine, or work this one over.

[4thesporty]

Trying to get this stand bolted to the back of the engine, but the rear main seal retainer plate is in the way no matter how I configure it. I removed all the small bolts from it, but I cannot remove it. How do you do it?

Also, even when this is out of the way the crank flange that the flywheel bolts to will probably be in the way also. Can this be removed from the crank before pulling the bottom end?

Thanks.

[dazedandconfused]

Bolt the motor to the stand sideways using the motor mount holes.

[4thesporty]

OK, the tear down has started. I have everything off the engine except the IP. Because the engine will not rotate, I beleive this is what is keeping me from pulling the IP gear, due to the helical cut on the gears. Is this correct? I am using a harmonic balancer puller for this job, which seems to want to work fine.




Soooo, in order to rotate this engine, what is my next step here? Should I remove the main caps? Looking at the cylinder walls and bottom end, nothing is sticking out as being wrong with the engine. This is my first teardown on a Cummins, so please excuse the amature questions. Here are some pics as well:



All the cylinder walls looked good with cross hatching still remaining. Number 2 had some carbon buildup, but nothing out of the ordinary IMHO:




Hopefully everything will clean up with only a hone job.


Because this is my first time, organization is key for me. All parts and hardware are bagged and labled:




Thanks in Advance

[dazedandconfused]

I would pull the ip pump and see if it turns. If it don't pull rod caps and knock the pistons out and see if it turns.

[4thesporty]

I can't get the gear off the IP. I think the motor needs to be able to rotate slightly to allow the IP gear to come free, correct?

[dazedandconfused]

I don't believe so. Take the nut off the front of the gear and all the bolts holding the pump so it has a little wiggle room. I haven't pulled one of these pumps yet but on the VP trucks just use a steering wheel puller and it comes right off.

[4thesporty]

OK, got the IP gear off, then the IP off. I just had to use a little extra ooompff on the puller . I also pulled the tappet cover off and I removed all the main caps. The motor will still not move.

Here are some pictures:






And here is where I called it a day.




When I started to pull the main caps off, I noticed that they were already numbered 1-7. Also, some of the rod cap bolts were rounded a little to where my 12 pt socket would not engage them very well. I left them alone till I can get a 6 pt 12mm socket. One other thing is that 4 of the connecting rods are a nice silver color with a green paint blob on the end (see pics) and then 2 of them are blackish with no paint blob on them. All main bearings looked like brand new, however you could tell that they were run. I am thinking that this motor got a cheapo rebuild at some point and the rebuilder screwed up some tolerance or torque spec. I honestly don't know what to do next because I can't get to some of the rod cap bolts due to the position of the crankshaft. I am thinking at this point to just remove the cam and send it to the machine shop and let them handle the tear down and rebuild of that much. Thoughts?

On removal of the cam shaft, do I need to worry about which lifter goes where or just let them drop? I plan on putting in an aftermarket cam during the rebuild, I guess I should probably install new lifters and pushrods too, right?

[dazedandconfused]

Put your mains back on loose and pull all the rods you can and knock those pistons out and try to spin it over again. Sounds like a seized rod bearing. It looks like you should be able yo get a wrench on the ones you cant get a socket on.

[oldestof11]

Could it be that little dowel pin right above the vacuum pump that engages the cam gear has gotten stuck?

[draginmopars]

pic 3 rod on left
pic4 rod on right
looks like they have been hot/ spun bearing

[ellis93]

pic 3 rod on left
pic4 rod on right
looks like they have been hot/ spun bearing

Ditto......

[4thesporty]

Thanks guys.

So, the darker rods are that way from heat I presume? I assume I should not reuse those two then, correct?

I'm going to get some more tools today and finish tearing it down, hopefully tonight.

[PToombs]

Could it be that little dowel pin right above the vacuum pump that engages the cam gear has gotten stuck?

You do realize that dowel is plastic right? It's made that way so it breaks and doesn't ruin anything when you forget and leave it in.



And you were doing so well too.............

[dazedandconfused]

Could it be that little dowel pin right above the vacuum pump that engages the cam gear has gotten stuck?

You do realize that dowel is plastic right? It's made that way so it breaks and doesn't ruin anything when you forget and leave it in.



And you were doing so well too.............

Now that was funny.