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09-01-2018, 10:36 AM
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#1
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Name: Poulina
Title: Too Much Time
Status: Not Here
Join Date: Dec 2015
Location: Norcal
Member`s Gallery
Posts: 795
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No luck w/ptfe seals?
So I’ve replaced 5 crank seals within 8,000 miles trying to get the front of my crank to not leak oil, albeit a very small leak, it bothers the hell out of me, my rear main is leaking too...just haven’t had the motivation to tackle that at all.
I’m a mechanic by trade, a foreman at the Subaru dealership I work at, I know how to install seals correctly and with care.
I’m starting to blame it on the type of seal Cummins uses for these applications, a PTFE (teflon) type seal, with no retaining spring. I contacted a custom seal manufacturer to help me develop a spring type seal...they will most likely make me buy a lot of them.
Anybody else ever have atrocious luck with the teflon seals that our trucks use??
Thanks for any and all help/comments
__________________
2008 QCLB 6.8 48re Suncoast PCS, DDP supermentals, forcedinductions 467/87, Hamilton 188/220, Carrillos, studded mains w/stock girdle
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09-01-2018, 11:32 AM
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#2
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Name: smokinVE
Title: $$+VE=NO HP
Status: Not Here
Join Date: Aug 2011
Location: Desart
Member`s Gallery
Posts: 1,731
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Have any end play on the crank?
Not sure for the CR but the 12V has a speedy sleeve for when the crank has a groove, if that’s what is possibly going on?
Also too much crank case pressure will push seals out quick.
__________________
93D350, VE powered, slow but reliable:-))
Quote:
Originally Posted by jasonc
I don't think they let hair sniffer twit much. Or the little gay guy. Only the Indian does.
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09-01-2018, 12:21 PM
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#3
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Name: biggy238
Title: Too Much Time
Status: Not Here
Join Date: Aug 2008
Location: Just North of Wrong
Member`s Gallery
Posts: 10,821
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Does this thread need to be a group buy thread or troubleshooting thread?
Sent from my XT1575 using Tapatalk
__________________
Check out @bdmaximusworx
05.5 Campanella White TDi Jetta 5spd 45.5MPG
-Little Sexy
'10 Silver F250 CCLB 4X4 6.4L cummins Swapped
Insta @trash.panda250
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09-01-2018, 01:02 PM
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#4
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Name: Mark Nixon
Title: No Savior among the flesh
Status: Not Here
Join Date: Feb 2009
Location: Brownville, Nebraska
Member`s Gallery
Posts: 8,676
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I have a few rear main seals that are rubber with a spring in them for tension.
I bought them on Ebay, from a guy back east a few years back, who apparently had a large quantity made because he was tired of the PTFE ones leaking.
IIRC, he was an engineer for Chrysler back when.
Mark.
__________________
If you or I did business like the PEOPLE in government do business, we'd be put in jail. Government is coercive.
Anarchy: The state of existence where there are no masters & no slaves. Therefore, Anarchy means the ABSENCE OF SLAVERY, or, in other words, FREEDOM.
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09-01-2018, 06:39 PM
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#5
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Name: Cflanery88
Title: Too Much Time
Status: Not Here
Join Date: Feb 2016
Location: Shelby, MI 49455
Member`s Gallery
Posts: 536
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I sleeved mine and bought new Oversized CNH seals for the sleeves and I have no leaks so far from the mains.
__________________
06 Dodge Ram 2500 6.4L, Wagler +.080 rods, Hobbit tuned, Exergy150% injectors,Polished s475/87 1:0 A/R Engineered Turbo Billet Wheel,arp625s,14mm main studs,PPE dual fuelers,Hamilton 188/220,extreme pushrods,Fleece bypass/drains/distribution block,110#springs.
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09-01-2018, 07:54 PM
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#6
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Name: Poulina
Title: Too Much Time
Status: Not Here
Join Date: Dec 2015
Location: Norcal
Member`s Gallery
Posts: 795
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Quote:
Originally Posted by biggy238
Does this thread need to be a group buy thread or troubleshooting thread?
Sent from my XT1575 using Tapatalk
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Was just thinking out loud I guess, dont intend to start any kind of group buy
__________________
2008 QCLB 6.8 48re Suncoast PCS, DDP supermentals, forcedinductions 467/87, Hamilton 188/220, Carrillos, studded mains w/stock girdle
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09-01-2018, 08:02 PM
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#7
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Name: Poulina
Title: Too Much Time
Status: Not Here
Join Date: Dec 2015
Location: Norcal
Member`s Gallery
Posts: 795
|
Quote:
Originally Posted by smokinVE
Have any end play on the crank?
Not sure for the CR but the 12V has a speedy sleeve for when the crank has a groove, if that’s what is possibly going on?
Also too much crank case pressure will push seals out quick.
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The front of my crank has been sleeved, the rear is soon to be once I tear out the trans again.
Engine was rebuilt about 9k miles ago, so I have not checked endplay recently, but I will right now. The engine is a heavy breather, meaning it has a little bit more blow by than average (I broke it in like a *****). I am also utilizing a stock 6.7 valve cover and ccv filter, using the turbo inlet as a source of vacuum.
I’ve tried a gutted ccv filter and fresh crank seal at the same time, with no changes, besides oil residue in my charge air piping.
__________________
2008 QCLB 6.8 48re Suncoast PCS, DDP supermentals, forcedinductions 467/87, Hamilton 188/220, Carrillos, studded mains w/stock girdle
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09-01-2018, 08:04 PM
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#8
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Name: Poulina
Title: Too Much Time
Status: Not Here
Join Date: Dec 2015
Location: Norcal
Member`s Gallery
Posts: 795
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Quote:
Originally Posted by Mark Nixon
I have a few rear main seals that are rubber with a spring in them for tension.
I bought them on Ebay, from a guy back east a few years back, who apparently had a large quantity made because he was tired of the PTFE ones leaking.
IIRC, he was an engineer for Chrysler back when.
Mark.
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Interesting....pm sent
__________________
2008 QCLB 6.8 48re Suncoast PCS, DDP supermentals, forcedinductions 467/87, Hamilton 188/220, Carrillos, studded mains w/stock girdle
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09-01-2018, 08:39 PM
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#9
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Name: Mark Nixon
Title: No Savior among the flesh
Status: Not Here
Join Date: Feb 2009
Location: Brownville, Nebraska
Member`s Gallery
Posts: 8,676
|
Pics of the seals I mentioned.
Mark.
__________________
If you or I did business like the PEOPLE in government do business, we'd be put in jail. Government is coercive.
Anarchy: The state of existence where there are no masters & no slaves. Therefore, Anarchy means the ABSENCE OF SLAVERY, or, in other words, FREEDOM.
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09-01-2018, 08:58 PM
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#10
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Name: biggy238
Title: Too Much Time
Status: Not Here
Join Date: Aug 2008
Location: Just North of Wrong
Member`s Gallery
Posts: 10,821
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Quote:
Originally Posted by Poulina
Was just thinking out loud I guess, dont intend to start any kind of group buy
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I was just trying to steer it away from a "this is what you did wrong" thread. Nothing against you
Sent from my XT1575 using Tapatalk
__________________
Check out @bdmaximusworx
05.5 Campanella White TDi Jetta 5spd 45.5MPG
-Little Sexy
'10 Silver F250 CCLB 4X4 6.4L cummins Swapped
Insta @trash.panda250
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