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06-11-2017, 10:46 PM
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#1
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Name: Cummins9912v
Title: Diesel Enthusiast
Status: Not Here
Join Date: Feb 2012
Location: camden ohio
Member`s Gallery
Posts: 154
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Rocker arm trouble
Hey guys I'm drawing a blank with rocker arm troubles on my p24, put a new motor in and used a 12v block, with 12v bottom end besides cam and pistons, bought a new Hamilton 207-220, ran the truck for 20 min and broke an intake rocker. No big deal? Changed the rocker and ran for another 10 min and broke a different rocker. So I had a new set laying in the shop. Changed them and it ran for 3 pulls before it broke another intake rocker. So my question is has anyone had this trouble and found a solution?
__________________
Wyatt
'99 dodge 12 valve Cummins
northeast 13mm p7100 set at 650cc 36* timing
5x25 dual feed injectors
S468/hx60 compounds
47re full billet, FMVB
Arp head studs
full Port and polish
Hamilton beehive springs
220/240 cam
Extreme duty pushrods
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06-11-2017, 11:28 PM
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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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Coil bind ?
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06-12-2017, 08:42 AM
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#3
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Name: jlbayes
Title: Too Much Time
Status: Not Here
Join Date: Mar 2011
Location: michigan
Member`s Gallery
Posts: 2,399
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Galling on the trunions?
__________________
Jacob, 97 rclb
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06-12-2017, 08:46 AM
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#4
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Name: Cummins9912v
Title: Diesel Enthusiast
Status: Not Here
Join Date: Feb 2012
Location: camden ohio
Member`s Gallery
Posts: 154
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I took the rockers off and all of them move freely, head is getting proper oil, the valvetrain is stock besides 110lb valve springs.
__________________
Wyatt
'99 dodge 12 valve Cummins
northeast 13mm p7100 set at 650cc 36* timing
5x25 dual feed injectors
S468/hx60 compounds
47re full billet, FMVB
Arp head studs
full Port and polish
Hamilton beehive springs
220/240 cam
Extreme duty pushrods
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06-12-2017, 09:19 AM
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#5
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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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In on this. A buddy had the same issues on his p24. First it pulled the threads out of the head. We put a thread insert in and then it broke the pedestal. Put a new rocker and pedestal in, pulled the thread insert out of the head. Repaired that again with a thread insert and no trouble since.
No galling, push rods straight as an arrow, beehive springs, never over 4k rpm. Stock cam.
__________________
2015 half ton heavy chevy
81 Fairmont LS project
Many yard ornament projects...
North American Turbo
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06-12-2017, 10:48 AM
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#6
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Name: YoungDiesel27
Title: Never Enough Time
Status: Not Here
Join Date: Jul 2010
Location: West Virginia
Member`s Gallery
Posts: 825
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What size valve relief and how much clearance did you have PTV when assembled?
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EFI Live, HP Tuners, Smarty custom tuning
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06-12-2017, 10:56 AM
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#7
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Name: Cummins9912v
Title: Diesel Enthusiast
Status: Not Here
Join Date: Feb 2012
Location: camden ohio
Member`s Gallery
Posts: 154
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Hamilton calls for .080 reliefs and I cut .200 because I want to go to a bigger cam later on, truck has absolutely no knocks, ticks, nothing. And has ran 3 5krpm passes before it broke another.
__________________
Wyatt
'99 dodge 12 valve Cummins
northeast 13mm p7100 set at 650cc 36* timing
5x25 dual feed injectors
S468/hx60 compounds
47re full billet, FMVB
Arp head studs
full Port and polish
Hamilton beehive springs
220/240 cam
Extreme duty pushrods
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06-12-2017, 11:17 PM
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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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See if you can get a .010 feeler gauge in the spring at max lift in 3 coils for a min of .030 clearance at Max lift .. that cam has 360 lift you likely have coil bind . That's a big cam on a 4 valve need to know your springs installed height. Next break might be a dropped valve so I would check this
Last edited by Rich dzl; 06-12-2017 at 11:18 PM.
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06-13-2017, 11:45 AM
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#9
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Name: Cummins9912v
Title: Diesel Enthusiast
Status: Not Here
Join Date: Feb 2012
Location: camden ohio
Member`s Gallery
Posts: 154
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Think I found the problem, cup on the pushrods seems to big and is pushing on the bottom of the rocker.
__________________
Wyatt
'99 dodge 12 valve Cummins
northeast 13mm p7100 set at 650cc 36* timing
5x25 dual feed injectors
S468/hx60 compounds
47re full billet, FMVB
Arp head studs
full Port and polish
Hamilton beehive springs
220/240 cam
Extreme duty pushrods
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