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04-13-2019, 02:26 AM
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#21
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Name: Beat68CST
Title: HP & $$
Status: Not Here
Join Date: Nov 2012
Location: Buckeye, Az
Member`s Gallery
Posts: 515
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After taking shipment of cam, make sure it's straight.
A good engine builder should be able to check and straighten one...
__________________
1999 Beetle ALH
2007 Megacab 6.7l
1968 C20 12v pile of parts.
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04-13-2019, 09:11 AM
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#22
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Name: TheHammer
Title: broke
Status: Not Here
Join Date: May 2012
Location: juneau wi
Member`s Gallery
Posts: 738
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Quote:
Originally Posted by DISTURBED
My gut says this isn't a billet steel cam. I can't remember the last time I heard a billet steel cam breaking. Cast is a different story.
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X2
Two years ago I had a customer with a 2.5 engine, 4v with a 13mm. He broke a cam similar to what you are describing, one look at the core, never again will I install that brand cam in a competition build. Since switching to no limit cams, I haven’t had any questions, concerns or problems.
And 103# at what height? That number means nothing. I understand that it’s advertised as such, but testing springs at the installed height is crucial, imo....
I’d be inspecting the gear lash and thrust on all components, the clearance between the cam and journals, straightness of cam,,, exc. pretty standard assembly.
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04-13-2019, 09:17 AM
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#23
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Name: pushlar84
Title: pushlar84
Status: Not Here
Join Date: Dec 2009
Location: new york
Member`s Gallery
Posts: 658
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No limit cams is where it’s at imo
__________________
2001 Ram- fuel by Northeast Diesel, 2.6 ED, Allison 1000. Haisley cam, engine & trans built in house
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04-15-2019, 04:30 PM
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#24
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Name: Yotadzl
Title: Diesel Enthusiast
Status: Not Here
Join Date: Feb 2016
Location: Oregon
Member`s Gallery
Posts: 234
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Quote:
Originally Posted by DISTURBED
My gut says this isn't a billet steel cam. I can't remember the last time I heard a billet steel cam breaking. Cast is a different story.
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You are right, I should have just said steel cam. Most of them are advertised as being machined from new steel billets, but I believe it is a cast steel blank. That being said, the manufacturer claimed to have not seen another one break without other mechanical failures causing it to bind and break.
__________________
'85 Yota Crawler-2l diesel, custom built VE (by me), custom T25 turbo. Slow but fun!
'95 Cummins grampa truck, embarrassingly stock
'12 Cummins, deleted
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04-15-2019, 04:36 PM
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#25
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Name: Yotadzl
Title: Diesel Enthusiast
Status: Not Here
Join Date: Feb 2016
Location: Oregon
Member`s Gallery
Posts: 234
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Quote:
Originally Posted by TheHammer
X2
Two years ago I had a customer with a 2.5 engine, 4v with a 13mm. He broke a cam similar to what you are describing, one look at the core, never again will I install that brand cam in a competition build. Since switching to no limit cams, I haven’t had any questions, concerns or problems.
And 103# at what height? That number means nothing. I understand that it’s advertised as such, but testing springs at the installed height is crucial, imo....
I’d be inspecting the gear lash and thrust on all components, the clearance between the cam and journals, straightness of cam,,, exc. pretty standard assembly.
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Ya I'm starting to think I shouldn't trust what I am being told by the manufacturer. I trust my engine builder and have not had this type of issue over multiple builds in the past. I will certainly be checking all those things when I tear it down. Thanks for your input.
__________________
'85 Yota Crawler-2l diesel, custom built VE (by me), custom T25 turbo. Slow but fun!
'95 Cummins grampa truck, embarrassingly stock
'12 Cummins, deleted
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04-15-2019, 06:33 PM
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#26
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Name: bracker8040
Title: Too Much Time
Status: Not Here
Join Date: Jan 2007
Member`s Gallery
Posts: 818
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Do you care to enlighten us on what brand of cam? Not looking to bash, just would like to know.
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04-15-2019, 09:41 PM
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#27
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Name: Yotadzl
Title: Diesel Enthusiast
Status: Not Here
Join Date: Feb 2016
Location: Oregon
Member`s Gallery
Posts: 234
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Quote:
Originally Posted by bracker8040
Do you care to enlighten us on what brand of cam? Not looking to bash, just would like to know.
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I’d rather not at this point. I don’t want to bash anyone until I figure out what the actual problem is.
Sent from my iPhone using Tapatalk
__________________
'85 Yota Crawler-2l diesel, custom built VE (by me), custom T25 turbo. Slow but fun!
'95 Cummins grampa truck, embarrassingly stock
'12 Cummins, deleted
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04-16-2019, 07:42 AM
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#28
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Name: bracker8040
Title: Too Much Time
Status: Not Here
Join Date: Jan 2007
Member`s Gallery
Posts: 818
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Quote:
Originally Posted by Yotadzl
I’d rather not at this point. I don’t want to bash anyone until I figure out what the actual problem is.
Sent from my iPhone using Tapatalk
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Understandable.
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04-16-2019, 12:25 PM
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#29
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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: 10,819
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Any pictures of the parts? Stock cam gear?
Sent from my SM-G950U 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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04-16-2019, 05:23 PM
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#30
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Name: Yotadzl
Title: Diesel Enthusiast
Status: Not Here
Join Date: Feb 2016
Location: Oregon
Member`s Gallery
Posts: 234
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Here’s a few pictures of the first broken cam.
Sent from my iPhone using Tapatalk
__________________
'85 Yota Crawler-2l diesel, custom built VE (by me), custom T25 turbo. Slow but fun!
'95 Cummins grampa truck, embarrassingly stock
'12 Cummins, deleted
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04-16-2019, 05:53 PM
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#31
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Name: bracker8040
Title: Too Much Time
Status: Not Here
Join Date: Jan 2007
Member`s Gallery
Posts: 818
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Quote:
Originally Posted by Yotadzl
Here’s a few pictures of the first broken cam.
Sent from my iPhone using Tapatalk
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I’m sure that’s cast.
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04-16-2019, 06:10 PM
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#32
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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: 10,819
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OK, after seeing pictures, I'm sticking with my first thought, I believe this is a gear out of concentricity, and cycling side load as it rotates. I would look for an odd or dual wear pattern on the cam gear and those in mesh with it.
Sent from my SM-G950U 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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06-23-2019, 06:05 PM
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#33
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Name: Inbred Inline
Title: Bastard child builder
Status: Not Here
Join Date: Dec 2014
Location: SE Michigan
Member`s Gallery
Posts: 370
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For the sled pullers/big setups on this thread running no limit, are you guys running the plain steel ones or the tool steel cams?
__________________
1994 Chevy RCLB C1500 6BT NV4500
2011 GMC CCLB 3500HD LML - STOCK
1992 Club Car, Kubota z430 "Inbred Inline Jr"
2000 Chevy CCSB C3500 3.0 Pro Stock 4x4 "Inbred Inline"-broken junk
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06-24-2019, 05:37 AM
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#34
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Name: pushlar84
Title: pushlar84
Status: Not Here
Join Date: Dec 2009
Location: new york
Member`s Gallery
Posts: 658
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Quote:
Originally Posted by Inbred Inline
For the sled pullers/big setups on this thread running no limit, are you guys running the plain steel ones or the tool steel cams?
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Plain steel
__________________
2001 Ram- fuel by Northeast Diesel, 2.6 ED, Allison 1000. Haisley cam, engine & trans built in house
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06-24-2019, 07:27 AM
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#35
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Name: 9724VF350
Title: Tractor Guy
Status: Not Here
Join Date: Mar 2010
Location: Northeast Ohio
Member`s Gallery
Posts: 2,784
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Quote:
Originally Posted by TheHammer
X2
I’d be inspecting the gear lash and thrust on all components, the clearance between the cam and journals, straightness of cam,,, exc. pretty standard assembly.
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This. I've seen cases where the block has been linebored incorrectly, reducing cam gear backlash, and breaking the cam as a result.
__________________
97 F350 4X4 CC Dually 5spd 24V 913 S300/HT3B Ranch Hand.
Playtoy-Oliver 1655. 12V now , 13mm, S475
Wife's ride-03 Excursion 12V swap in the works.
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06-24-2019, 08:15 AM
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#36
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Name: zfaylor
Title: Comp Diesel Sponsor
Status: Not Here
Join Date: Nov 2010
Location: P-TOWN!, Indiana
Member`s Gallery
Posts: 5,024
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Adjustable pump gear by chance? The last one we installed on a 3.0 truck was built very far off center. The Gear would get tight enough to hardly rotate the engine on one side.
__________________
2015 half ton heavy chevy
81 Fairmont LS project
Many yard ornament projects...
North American Turbo
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06-24-2019, 08:24 AM
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#37
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Name: Signature600
Title: THA MAN!
Status: Not Here
Join Date: Aug 2006
Location: Jeffersonville, Ohio
Member`s Gallery
Posts: 11,960
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My bet, he's coming out of the fuel hard and unloading the drive strain on the cam is causing this. It takes a lot of power to drive a good P-pump, and when you unload it quick it can be a shock...Why it isn't drilled to the second journal is beyond me, everyone knows that is a must on a P-pump.
Junk cam, IMHO
Chris
__________________
THANKS TO:
Tim Barber @ TRE Diesel
Jeff Mumau @ Mumau Diesel Service
Rip @ Source Automotive
Don Thuren @ ThurenFab Suspension
Columbus Diesel Supply
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06-24-2019, 08:39 AM
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#38
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Name: Soup Nazi
Title: The artist formerly known as Don M
Status: Not Here
Join Date: Sep 2006
Member`s Gallery
Posts: 1,197
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Is that a steel retainer?
That cam looks like it was hardened very deeply, is it 8620 steel? Is the gear a stock 12v gear like the cummins dodge engine uses?
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06-24-2019, 09:36 AM
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#39
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Name: CTDYoungGun
Title: Seth- Fuel Injection Guy
Status: Not Here
Join Date: Aug 2007
Location: Kansas City, Mo
Member`s Gallery
Posts: 1,568
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Another quick thing to check is the front gear housing. If it isn't a genuine Cummins housing that could be your issue. A lot of the Asian knockoff housings aren't machined correctly and cause gear misalignment/ mesh issues as others have said.
__________________
Seth Farrell
Farrell Diesel Service
816-205-0757
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