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04-27-2012, 03:46 PM
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#1
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Name: me2
Title: Too Much Time
Status: Not Here
Join Date: Dec 2011
Member`s Gallery
Posts: 307
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Rod swap through the oil pan ?
I am thinking of putting 12V rods into my 6.7. Its not presently installed in a truck.
Is it possible to swap rods into a 6.7 via the oil pan, leaving the head in place ?
Ie, turn the engine upside down, pull the pan, pull the crank, pull each piston out, swap the rod, put the piston back in, reassemble ?
Is this feasible ?
Thanks
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04-27-2012, 03:54 PM
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#2
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Name: Big Swole
Title: MegaInterceptor
Status: Not Here
Join Date: Jun 2007
Location: Atlanta, GA
Member`s Gallery
Posts: 16,950
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Good luck with that...
__________________
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04-27-2012, 03:54 PM
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#3
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Name: GRotman
Title: Chief Indian
Status: Not Here
Join Date: Jul 2006
Location: Allendale,Mi
Member`s Gallery
Posts: 2,516
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nope
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04-27-2012, 04:12 PM
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#4
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Name: me2
Title: Too Much Time
Status: Not Here
Join Date: Dec 2011
Member`s Gallery
Posts: 307
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Can't compress the rings to get the pistons in ?
Why won't it work ?
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04-27-2012, 04:19 PM
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#5
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Name: me2
Title: Too Much Time
Status: Not Here
Join Date: Dec 2011
Member`s Gallery
Posts: 307
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I'm doing head studs and I'm stripping the block to paint it. I guess pulling the head wouldn't be that bad. I wouldn't have to pull the crank then.
Do I need to buy a new head gasket ? The engine has 4,000 miles on it.
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04-27-2012, 05:02 PM
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#6
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Name: nike
Title: "Can't have nothing!"
Status: Not Here
Join Date: Nov 2007
Location: Tx
Member`s Gallery
Posts: 779
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A new gasket is $90......
__________________
Toys are gone; just an old flatbed farm truck these days......
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04-27-2012, 05:07 PM
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#7
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Name: 307diesel
Title: built 6.7
Status: Not Here
Join Date: Apr 2010
Member`s Gallery
Posts: 426
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Trip over a dollar to pick up a dime.....head gasket is cheap
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04-27-2012, 05:08 PM
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#8
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Name: me2
Title: Too Much Time
Status: Not Here
Join Date: Dec 2011
Member`s Gallery
Posts: 307
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Quote:
Originally Posted by nike
A new gasket is $90......
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Just what I needed to hear.
Does the front drive cover need to come off to pull the head ?
Last edited by me2; 04-27-2012 at 05:09 PM.
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04-27-2012, 05:11 PM
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#9
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Name: Big Swole
Title: MegaInterceptor
Status: Not Here
Join Date: Jun 2007
Location: Atlanta, GA
Member`s Gallery
Posts: 16,950
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Quote:
Originally Posted by me2
Just what I needed to hear.
Does the front drive cover need to come off to pull the head ?
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Nope...
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04-27-2012, 05:14 PM
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#10
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Name: Big Swole
Title: MegaInterceptor
Status: Not Here
Join Date: Jun 2007
Location: Atlanta, GA
Member`s Gallery
Posts: 16,950
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Quote:
Originally Posted by me2
Can't compress the rings to get the pistons in ?
Why won't it work ?
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Even if the rings could be compressed...Think about the compression you'd be pushing against to get them in...lol
Pulling the head will give ya a chance to check everything out and catch something like a valve seat, crack in head, etc... Plus start with a a perfectly clean surface and new HG...Ready for some BIG hp!! lol
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04-27-2012, 05:23 PM
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#11
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Name: me2
Title: Too Much Time
Status: Not Here
Join Date: Dec 2011
Member`s Gallery
Posts: 307
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Quote:
Originally Posted by Big Swole
Even if the rings could be compressed...Think about the compression you'd be pushing against to get them in...lol
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Pop the injector out. Open a valve.
Quote:
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Pulling the head will give ya a chance to check everything out and catch something like a valve seat, crack in head, etc...
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My engine has 4,000 miles on it.
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04-27-2012, 05:24 PM
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#12
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Name: me2
Title: Too Much Time
Status: Not Here
Join Date: Dec 2011
Member`s Gallery
Posts: 307
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So what stops one from pulling the pistons out the bottom ? Is there a clearance issue somewhere ?
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04-27-2012, 05:25 PM
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#13
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Name: Cummin_un_glued
Title: Too Much Time
Status: Not Here
Join Date: Sep 2007
Location: Ash Flat Arkansas
Member`s Gallery
Posts: 785
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the pistons wont even come down far enough to get to the wrist pin snap rings. they hit the block. only way out is thru the top.
__________________
Quote:
Originally Posted by Joesixpack
It don't need any of that chit, CompD is the name of the game not "can I tow with this.com"
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04-27-2012, 05:33 PM
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#14
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Name: huhta99
Title: one nation under God
Status: Not Here
Join Date: Apr 2008
Location: a barren wasteland
Member`s Gallery
Posts: 683
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Just pull it out and you wont have the troubles.
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04-27-2012, 05:49 PM
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#15
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Name: Big Blue24
Title: Comp Diesel Sponsor
Status: Not Here
Join Date: Jan 2008
Location: Cedar City, UT
Member`s Gallery
Posts: 6,310
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You can't get the piston past the crank or block on the bottom.
This picture is from the underside of a 6.7 block in-frame with the oil pan removed and #1 piston & rod removed from the top side.
__________________
95' 2wd Junker Drag Truck
1502 HP Fuel-Only 12mm P7100 Pump
SXE 472 over GTX55 116mm 
OEM 12v Block 
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04-27-2012, 05:52 PM
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#16
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Name: coorsman2005
Title: i like beer
Status: Not Here
Join Date: Jun 2011
Location: blackwell,ok
Member`s Gallery
Posts: 784
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If your planning much HP with the motor. I would go ahead and get the Vulcan hg. It's pricey but after I went through 3 stock ones. This is the only one that has actually lasted.
__________________
08 3500 qcsb 6.7 6 speed manual, valair DD, all deletes efi live, arp studs&rocker studs, Vulcan hg w/orings, max spool valve springs, max spoolpush rods, SB66.
2008 megacab 4x4 dually 12v build in progress
1990 2wd d100 4bt nv5600 vailair single disk in progress
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04-27-2012, 06:36 PM
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#17
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Name: me2
Title: Too Much Time
Status: Not Here
Join Date: Dec 2011
Member`s Gallery
Posts: 307
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Thanks for the advice, guys, all of it. Lots of things to think about here.
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04-27-2012, 08:34 PM
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#18
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Name: Joesixpack
Title: Pull'n it.
Status: Not Here
Join Date: Apr 2008
Member`s Gallery
Posts: 4,118
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Quote:
Originally Posted by me2
So what stops one from pulling the pistons out the bottom ? Is there a clearance issue somewhere ?
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These guys are getting soft.
__________________
Basically stock if I would have built it at the factory.....
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04-27-2012, 08:44 PM
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#19
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Name: CSnyder
Title: Snyder-Motorsports
Status: Not Here
Join Date: Mar 2008
Member`s Gallery
Posts: 6,278
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Quote:
Originally Posted by Joesixpack
These guys are getting soft.
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thats the truth!
Seriously OP if you are going to go through the trouble to remove the engine, pull injectors, and open a valve to TRY removing the pistons out the bottom you are definately in the wrong place. Like someone else said....trip over a dollar to pick up a dime. Why are you so concerned about the headgasket being replaced? Its not a big deal at all. If doing it right is confusing you then you should just take it to a mechanic to do the work.
On Edit...I see the engine is already out of the truck....just load it into a truck and take it to someone. I can tell by the questions you have that Cummins is new to you and if you phuck it up doing it wrong or not getting it right then there will be a new thread on what happened.
__________________
Alot of my life is easier thanks to Mumau Diesel! and Goerend Transmission
There is a HUGE difference between cocky and confident when it comes to engine building.
Last edited by CSnyder; 04-27-2012 at 08:49 PM.
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04-27-2012, 10:01 PM
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#20
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Name: me2
Title: Too Much Time
Status: Not Here
Join Date: Dec 2011
Member`s Gallery
Posts: 307
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Just to clarify, if you read the initial post, the engine is already out of the truck.
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