Advertisement
If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Home Who's Online Today's Posts HP Calculator CompD Gift Shop Mark Forums Read
Go Back   Competition Diesel.Com - Bringing The BEST Together > Tech Area- Dodge > Dodge Tech > 2007.5-2013 6.7L
Register Members List Timeslips EFI Live Library Invite Your Friends FAQ Calendar Mark Forums Read

Closed Thread
 
Thread Tools
Old 09-01-2018, 10:36 AM   #1
Poulina
 
Poulina's Avatar

Name: Poulina
Title: Too Much Time
Status: Not Here
Join Date: Dec 2015
Location: Norcal
Member`s Gallery
Posts: 795
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
 
Old 09-01-2018, 11:32 AM   #2
smokinVE
 
smokinVE's Avatar

Name: smokinVE
Title: $$+VE=NO HP
Status: Not Here
Join Date: Aug 2011
Location: Desart
Member`s Gallery
Posts: 1,731
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 View Post
I don't think they let hair sniffer twit much. Or the little gay guy. Only the Indian does.
 
Old 09-01-2018, 12:21 PM   #3
biggy238
 
biggy238's Avatar

Name: biggy238
Title: Too Much Time
Status: Here
Join Date: Aug 2008
Location: Just North of Wrong
Member`s Gallery
Posts: 10,819
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
 
Old 09-01-2018, 01:02 PM   #4
Mark Nixon
 
Mark Nixon's Avatar

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
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.
 
Old 09-01-2018, 06:39 PM   #5
Cflanery88
 
Cflanery88's Avatar

Name: Cflanery88
Title: Too Much Time
Status: Not Here
Join Date: Feb 2016
Location: Shelby, MI 49455
Member`s Gallery
Posts: 536
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.
 
Old 09-01-2018, 07:54 PM   #6
Poulina
 
Poulina's Avatar

Name: Poulina
Title: Too Much Time
Status: Not Here
Join Date: Dec 2015
Location: Norcal
Member`s Gallery
Posts: 795
Quote:
Originally Posted by biggy238 View Post
Does this thread need to be a group buy thread or troubleshooting thread?

Sent from my XT1575 using Tapatalk
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
 
Old 09-01-2018, 08:02 PM   #7
Poulina
 
Poulina's Avatar

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 View Post
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.
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
 
Old 09-01-2018, 08:04 PM   #8
Poulina
 
Poulina's Avatar

Name: Poulina
Title: Too Much Time
Status: Not Here
Join Date: Dec 2015
Location: Norcal
Member`s Gallery
Posts: 795
Quote:
Originally Posted by Mark Nixon View Post
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.
Interesting....pm sent
__________________
2008 QCLB 6.8 48re Suncoast PCS, DDP supermentals, forcedinductions 467/87, Hamilton 188/220, Carrillos, studded mains w/stock girdle
 
Old 09-01-2018, 08:39 PM   #9
Mark Nixon
 
Mark Nixon's Avatar

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.
Attached Images
File Type: jpg 1535851924790-1163895800.jpg (165.1 KB, 0 views)
File Type: jpg 1535851980271-2067978260.jpg (217.7 KB, 0 views)
File Type: jpg 1535852005742898146482.jpg (205.0 KB, 0 views)
File Type: jpg 1535852065812-601956588.jpg (178.7 KB, 0 views)
__________________
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.
 
Old 09-01-2018, 08:58 PM   #10
biggy238
 
biggy238's Avatar

Name: biggy238
Title: Too Much Time
Status: Here
Join Date: Aug 2008
Location: Just North of Wrong
Member`s Gallery
Posts: 10,819
Quote:
Originally Posted by Poulina View Post
Was just thinking out loud I guess, dont intend to start any kind of group buy
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
 
Closed Thread

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 06:11 AM.

 


Powered by vBulletin
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2006 - 2024, CompetitionDiesel.com
all information found on this site is property of www.competitiondiesel.com