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04-12-2019, 10:46 AM
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#1
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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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Breaking billet cams?
I have a '99 P-pump 24v I'm working on for a customer. He just broke the second billet cam in less than 5000 miles. It is a name brand cam with all matching valve train. The engine is around 850 HP, not spun over 4k RPM. No fault was found the last time and I sent the cam to the manufacturer for inspection. They could not see an issue, but supplied me with new parts. I'm just trying to figure out where the problem may be, looking for any 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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04-12-2019, 10:59 AM
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#2
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Name: Rich dzl
Title: 12v guru
Status: Not Here
Join Date: Mar 2011
Member`s Gallery
Posts: 741
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That's interesting..
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04-12-2019, 11:02 AM
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#3
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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 Rich dzl
That's interesting..
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I guess that's one way of looking at it...
__________________
'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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04-12-2019, 11:05 AM
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#4
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Name: chevota84
Title: Too Much Time
Status: Not Here
Join Date: Jul 2009
Location: Prineville, OR
Member`s Gallery
Posts: 4,926
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Cam bearings?
Sent from my SM-G965U using Tapatalk
__________________
99 Dodge 2500 with stuff
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04-12-2019, 11:05 AM
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#5
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Name: JWhite
Title: Trained monkey
Status: Not Here
Join Date: Aug 2009
Location: F Burg Ohio
Member`s Gallery
Posts: 1,817
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What spring pressure? Just the stock cam bearings? Where's it breaking at?
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GMC with a LiLLY
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04-12-2019, 11:07 AM
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#6
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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 JWhite
What spring pressure? Just the stock cam bearings? Where's it breaking at?
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103# springs. Yes stock cam bearings. It is breaking just behind the first journal. Well at least it did last time, and I'm pretty sure it did this time too because no valves are moving.
__________________
'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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04-12-2019, 11:10 AM
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#7
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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 chevota84
Cam bearings?
Sent from my SM-G965U using Tapatalk
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The bearings came up after the last failure. When I talked to the manufacturer he told me that with this setup I should not need bearings in all journals. There was no evidence of galling on the journals to suggest that it bound up and snapped. But I am wondering if maybe this has something to do with it.
__________________
'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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04-12-2019, 11:14 AM
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#8
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Name: Rich dzl
Title: 12v guru
Status: Not Here
Join Date: Mar 2011
Member`s Gallery
Posts: 741
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Pump thrust is what causes breaks I seen , 850 hp and less than 4K should never break it .. did you install a new cam bearing in the front ? cam tunnel line boring and install bushings would be the place to start ..
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04-12-2019, 11:15 AM
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#9
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Name: Rich dzl
Title: 12v guru
Status: Not Here
Join Date: Mar 2011
Member`s Gallery
Posts: 741
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We are talking steel cams right ? Is the crank gear welded if not it should have spun ,Better look at the injection pump also
Last edited by Rich dzl; 04-12-2019 at 11:21 AM.
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04-12-2019, 11:22 AM
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#10
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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 Rich dzl
We are talking steel cams right ? Is the crank gear welded ? Did it spin it ?
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Yes steel cams. The crank gear is not welded, and it was not spun last time. I haven't go it apart yet this time.
__________________
'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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04-12-2019, 11:27 AM
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#11
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Name: Rich dzl
Title: 12v guru
Status: Not Here
Join Date: Mar 2011
Member`s Gallery
Posts: 741
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What's the piston to valve clearance @ overlap and no coil bind ? Look for Some way it's loading the cam what's the C/L degreed at . what year block ?
Last edited by Rich dzl; 04-12-2019 at 11:32 AM.
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04-12-2019, 11:39 AM
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#12
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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 Rich dzl
What's the piston to valve clearance @ overlap and no coil bind ? Look for Some way it's loading the cam what's the C/L degreed at . what year block ?
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Not sure on actual piston/valve clearance at this time. Will have to check when I pull apart. Shouldn’t be cool bind with the cams and springs I’m using.
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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04-12-2019, 11:49 AM
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#13
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Name: Rich dzl
Title: 12v guru
Status: Not Here
Join Date: Mar 2011
Member`s Gallery
Posts: 741
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Your missing something , take it apart and tell us what u find
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04-12-2019, 11:52 AM
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#14
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Name: 06 DIESEL
Title: Dead Eye Firearms LLC
Status: Not Here
Join Date: Sep 2007
Location: Airville, PA
Member`s Gallery
Posts: 5,122
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Friend of mine snapped one in the exact same place when he was doing a dyno hit fogging the truck with a bottle. We had no idea it broke until we went to upgrade the cam and it fell off in our hands, jagged break and long bolt kept it together. We assumed it was from the nos hit.
__________________
Travis
My rig - 2021 Mega 3500 SRW
My Classic - 79 Chevy Silverado
Quote:
Originally Posted by RonA
Trucks are like women. Sometimes you just need to spend money on them to keep them happy.
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04-12-2019, 12:04 PM
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#15
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Name: Rich dzl
Title: 12v guru
Status: Not Here
Join Date: Mar 2011
Member`s Gallery
Posts: 741
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Steel cam with the long bolt ?
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04-12-2019, 01:03 PM
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#16
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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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Ppump drives so much harder and the helical gear strains the cam wanting to twist it sideways
U need a bearing support on the snout of the cam
PPD offers a nice setup but it’s gonna keep breaking it without it
__________________
2001 Ram- fuel by Northeast Diesel, 2.6 ED, Allison 1000. Haisley cam, engine & trans built in house
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04-12-2019, 01:36 PM
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#17
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Name: Snedge
Title: Comp Diesel Sponsor
Status: Not Here
Join Date: Sep 2006
Location: Western Pa.
Member`s Gallery
Posts: 18,858
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Quote:
Originally Posted by pushlar84
Ppump drives so much harder and the helical gear strains the cam wanting to twist it sideways
U need a bearing support on the snout of the cam
PPD offers a nice setup but it’s gonna keep breaking it without it
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This.
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04-12-2019, 02:29 PM
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#18
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Name: zachu812
Title: Too Much Time
Status: Not Here
Join Date: Apr 2016
Member`s Gallery
Posts: 419
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Quote:
Originally Posted by pushlar84
Ppump drives so much harder and the helical gear strains the cam wanting to twist it sideways
U need a bearing support on the snout of the cam
PPD offers a nice setup but it’s gonna keep breaking it without it
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Is there something different about this setup? There's plenty of guys running 13mm pumps without supports, myself included, on a stock cam.
__________________
1995 RCLB 4x4: H-pump, 5x.012s, HX35
2001 RCLB 4x4: H-pump, 6x.013s, S472/S488
EdzGarage, Matt's Diesel Supply, HTS Transmissions
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04-12-2019, 04:09 PM
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#19
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Name: Rich dzl
Title: 12v guru
Status: Not Here
Join Date: Mar 2011
Member`s Gallery
Posts: 741
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I got about 10 or more pulling engines i built all running steel cams with zero breaks few have seen 6,000 rpm
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04-12-2019, 08:12 PM
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#20
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Name: DISTURBED
Title: YEA WE RIDE THE SHORT BUS
Status: Not Here
Join Date: Nov 2007
Location: Winchester, Va
Member`s Gallery
Posts: 6,417
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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.
__________________
Thanks, Jeremy
01 CTD Retired sled puller, dedicated "Twin Turbo" tow rig
96 CTD "TOO" Disturbed 3.0 - Built by Disturbed Diesel Performance
96 CTD "The Sickness" 2.6/2.8- Built by Disturbed Diesel Performance
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