Thread: Pulldown and inspect of my ex army 4bd1-t

Originally Posted by Vern

So what was actually wrong with the injectors and pump to warrant a rebuild? Or did the diesel mob just need some money😊.


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Mindreader.....

I just checked the piston height tdc with a dual indicator and they are all over the place! There are within 6 thou " , Also check the Bdc with a vernier and I got reading between 4 thou " !

Is this normal?

ID guess that either your disturbing the arm for the DTI going from pot to pot or you havent cleaned up the crowns before you did your measuring.

6 thou out would be concerning on a new engine but with the combined probabilities of error in measuring, the combined float of the big ends and the mains plus crown erosion or carbon build up I wouldn't be worried about bent rods or a twisted crank at this point.

Originally Posted by Geeman

Hey don't know much about diesel stuff , but here is the receipt for the work!
Attachment 113733

that fits the bill for what I would call "while I'm here work"

the odds are that you didn't "need" any of the work done however, while you have some things in pieces to do some work on them the difference between just checking and replacing some of the parts isnt huge. so while just checking out your pump and injectors might have been say $300 in parts and labour and calibrating the pump might have been $500 including adjusting the crack pressure on the injectors.

Replacing the nozzles on an injector means you have to reset its crack pressures so lets say that doing that adds another $100 in labour plus the parts to do that, If your nozzle spray pattern wasn't great then Id replace the nozzle and reset the crack pressure. That would have been figured out when the initial bench testing was done. Doing it is the sign of a good diesel fitter.

However what its not is the sign of a good shop. A good shop would have done the testing ,raised the reports and then asked you what you wanted to do unless you specified that you wanted the injectors and pump reset or returned to spec when you put the gear in for servicing.

if thats what you did then they've done as asked and while I think the bills a little higher than it needs to be for the type of pump and injectors I've seen and heard of much higher charges for the same work.

Ahh it's all good, now that I know the pump and injectors are all fine all I have to worry abound is the rest of the motor!

Pulled the bearing caps of the cranks

they look ok, but there is signs of wear! You can see that there is more load on the rear of the crank and front compared to the middle!

Pics of the crank surface.

there is some tiny score marks that you can feel with your finger nails on some of them.

Pics of the Thrust Waser

They have stuff all wear! You can still see the STD stamped on them!

That's enough for today, ran out of table space. Have to buy one of those tear down tables on ebay!