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6.5L Turbo Diesel 1992-00 6.5TD - Discussion forum for the 6.5L engine.

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  #21  
Old 03-15-2018, 01:30 PM
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Jeep

There are a lot of cracked blocks out there.

With the inserts in the holes the block should be good to go.

Are these the LOCK N STITCH ????

THEY WILL hold things together.

As long as the crack is not past the end of the web area you should be OK.
When the crack gets into the area beyond the bolt holes its getting real sketchy..

Beyond the bolt holes and they can start into the cylinder wall, and this is a no no...
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  #22  
Old 03-16-2018, 09:22 AM
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The shadowed imprint of "both" valves on the piston crown tell me that piston protrusion exceeds the allowable high limit. I doubt it's a valve timing issue. With a valve timing problem, I'd be inclined to think that one valve or the other could have an interference problem, but not likely both.

Incidentally, I wrote an article covering 6.5 piston protrusion a while back...

https://www.thedieselpage.com/member...rotrusionc.htm
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  #23  
Old 03-16-2018, 10:07 AM
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Well if anyone wants an early squirter block, .040 over, 007 taken off the decks and has a cracked main web, please come get it. Otherwise it is heading for the scrap heap.
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  #24  
Old 03-16-2018, 11:16 AM
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Block with inserts visible -

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Old 03-16-2018, 12:15 PM
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Pulled my heads apart and found aftermarket seals on both intake and exhaust. No o-rings on the stems.

Machinist recommended going to a modern viton seal instead of the rubber that were on there.

Would I still need o-rings? Since mine did not have o-rings (and definite oil control problems) I have no reference as to where they would be installed (over or under the seal).

Thanks!!
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  #26  
Old 03-17-2018, 04:44 PM
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The o-ring goes in the lower top grove on the stem not down where the seal is... and yes I would say you need it..
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  #27  
Old 03-18-2018, 06:13 AM
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The o ring helps keep a lot of oil from pouring down from the spring retainer past the keeper and down the valve stem.

Yes you do want the o rings in there.


Good luck
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  #28  
Old 03-19-2018, 10:05 AM
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Well that explains why there was so much oil residue in my intake ports...
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  #29  
Old 03-19-2018, 10:18 AM
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Quote:
Originally Posted by JeepSJ View Post
Well that explains why there was so much oil residue in my intake ports...
There is so much oil vapor/residue allowed by the CDR, I doubt you could really tell how much would be allowed by the valve stems. The O-rings are necessary, but hardly negligible compared to other sources.
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  #30  
Old 03-19-2018, 10:42 AM
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Quote:
Originally Posted by DmaxMaverick View Post
There is so much oil vapor/residue allowed by the CDR, I doubt you could really tell how much would be allowed by the valve stems. The O-rings are necessary, but hardly negligible compared to other sources.
That would be true if my CDR had been routed to my intake, which it was not. And all of the residue was in the pocket behind the valves, not upstream of the guides.
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