6.9 rebuild
Thread Starter
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Junior User
Joined: May 2008
Posts: 79
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6.9 rebuild
I am looking into rebuilding my 86 6.9 since it is burning oil. I read that International put soft rings in the engine and that can be corrected when rebuilt. My only concern there is that harder rings will wear the block. Anyway, I am trying to do this on a budget and therefore want to reuse as much as possible and avoid any unnecessary machine work. So what can you tell me about the block and heads per say. If the cylinders walls are clean and are not wore can I reuse the pistons and put new rings in them? I suppose that the cam and crank will need to be machined, they have on any gas engine I rebuilt, or can I just put new bearings in if they spec out ok. Do the heads have replaceable valve guides. I am looking at a rebuild kit that is for a international 6.9 and am told that this is the same kit. anyway what should I be on the lookout for?
Junior User
Joined: Apr 2007
Posts: 95
Likes: 0
From: Wolfe City TX
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
What condition is the CDR in?
Has it been serviced recently?
How many miles on the engine?
As far as the rebuild, the best answer there is have the machine shop check everything.
Replace everything that is worn or out of spec.
Check the heads, valve guides, valves and valve springs.
I had everything magnafluxed in mine.
I also did a minimum bore, so I had fresh cylinder walls, new pistons and rings.
All bearings replaced, crank polished.
New cam and lifters.
I also used 7.3 rockers instead of the stock rockers, much stronger.
I have about 2500 in parts and machine work in just the engine, I did all the labor myself.
Has it been serviced recently?
How many miles on the engine?
As far as the rebuild, the best answer there is have the machine shop check everything.
Replace everything that is worn or out of spec.
Check the heads, valve guides, valves and valve springs.
I had everything magnafluxed in mine.
I also did a minimum bore, so I had fresh cylinder walls, new pistons and rings.
All bearings replaced, crank polished.
New cam and lifters.
I also used 7.3 rockers instead of the stock rockers, much stronger.
I have about 2500 in parts and machine work in just the engine, I did all the labor myself.
Thread Starter
|
Junior User
Joined: May 2008
Posts: 79
Likes: 0
What condition is the CDR in?
Has it been serviced recently?
How many miles on the engine?
As far as the rebuild, the best answer there is have the machine shop check everything.
Replace everything that is worn or out of spec.
Check the heads, valve guides, valves and valve springs.
I had everything magnafluxed in mine.
I also did a minimum bore, so I had fresh cylinder walls, new pistons and rings.
All bearings replaced, crank polished.
New cam and lifters.
I also used 7.3 rockers instead of the stock rockers, much stronger.
I have about 2500 in parts and machine work in just the engine, I did all the labor myself.
Has it been serviced recently?
How many miles on the engine?
As far as the rebuild, the best answer there is have the machine shop check everything.
Replace everything that is worn or out of spec.
Check the heads, valve guides, valves and valve springs.
I had everything magnafluxed in mine.
I also did a minimum bore, so I had fresh cylinder walls, new pistons and rings.
All bearings replaced, crank polished.
New cam and lifters.
I also used 7.3 rockers instead of the stock rockers, much stronger.
I have about 2500 in parts and machine work in just the engine, I did all the labor myself.
Laughing Gas
Joined: Jun 2007
Posts: 1,106
Likes: 35
From: Virginia
Is it burning oil through the rings, or the CDR valve. When you pull up the air filter, look in the intake and see if it is all wet from oil at the CDR mount. If it is wet, I would service the CDR first. I serviced mine and my oil consumption was stopped.
