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Discussion Starter #1
4g63T Short Block Inspection
6 Bolt



A customer came in and dropped off a 6 bolt short block.
He was feeling a bit “iffy” about the rebuilt short block he had just bought. It was supposed to be drop in and run ready.

After a look at it in the back of the truck, we agreed it would be best if I pulled it apart.

It was dirty, looks like whoever rebuilt did not even clean the block.

How it looks during tear down.
Looks to have a new, but oxidized front case and water pump.


New coated top NPR pistons.


The oily dirty inside. Looks to have new bearings.


Was it honed when it was assembled? To me it is not even a decent backyard job.


The front case and water pump removed. This is a bit of new one on me, a freeze plug installed as part of the BSE, as long as it blocks the oil hole, it will work.


A True 6 bolt turbo block, It has squirters.


It has new STD King bearings. These will be kept, cleaned and installed.


The coated top pistons.


The crank looks decent, It will have the oil galley balls removed, so a proper cleaning can be done.


Number 1 Cylinder has a bit of a rust ridge from a ring. I hope it will hone out.


Some of the crud that has settled down on the rings.


Another piston.



The block will be cleaned, honed, decked and the block oil mod done.
The bores will be a tad loose, about .003 over std bore.

The rings removed, and the rods and pistons will cleaned, and the big ends checked for size.

The crank will have the oil galley balls removed, then tapped for a threaded plug. Measured for spec. and polished
 

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On the block, what is the oil block mod? Is that removing the oil squirters?

May I ask why you going a lil loose over the standard bore? Isn't NPR's like stock pistons?

Does it have the stubbyshaft for the BSE "mod"

Sorry for the questions, but I think everyone can benefit...Great thread, once again!
 

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Discussion Starter #3
On the block, what is the oil block mod? Is that removing the oil squirters?

May I ask why you going a lil loose over the standard bore? Isn't NPR's like stock pistons?

Does it have the stubbyshaft for the BSE "mod"

Sorry for the questions, but I think everyone can benefit...Great thread, once again!
The block oil mod is now posted here.
http://www.dsmtalk.com/forums/showthread.php?p=2453434#post2453434

I prefer to keep the oil squirters when the block is equipped with them, they are not really needed with forged internals when the engine will see high load for short time periods on the 6 bolt. 7 bolts with the squirters in the mains get knocked out and plugged.

A std bore block is going to end up a tad loose, from wear of the previous build, then the hone of the new build.

This customer did not want to bore the block and buy new pistons, that is why he bought this short block.

This block has to use the stubby shaft, it suffered a spun rear BS bearing, so a cut down shaft would not work.
 

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That thing sat somewhere damp thats for sure. Someone put in the wrench time and money and just wasted it, looks like it will come back good though.
 
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