Duramax Diesels Forum Truck of the Week
  #46  
Old 05-14-2017, 08:58 PM
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Originally Posted by rcr1978 View Post
The gears from the LB7 pump fit in the Melling pump no problem so riddle me that, guess my caliper reading skills must be fukd
Lmm won't nor LBZ... though drive gear is interchangeable
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  #47  
Old 05-14-2017, 09:03 PM
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Quote:
Originally Posted by malibu795 View Post
Lmm won't nor LBZ... though drive gear is interchangeable
Well wtf Lb7's have a bigger pump then the others
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  #48  
Old 05-14-2017, 09:10 PM
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I will post up the gear sizes in the next day so we can get this strait, maybe measure your stuff if you can to Adam?
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04 LB7 ECSB Built motor, Wagler billet narrowed Rods, Callies billet crank, Mahle Race Cast pistons, Randy's Girdle, Wagler/Callies Stage 1 alterfire cam, Exergy 100% SAC's, dual CP3's, Randy's race ported heads, Profab cast flow/up pipes, and S475 over stock twins for now more later.
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2015 LML Cab and chassis- Tuning/Exhaust
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  #49  
Old 05-14-2017, 09:17 PM
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Will do.. when I get back home... As for max psi I hit 85-90# with 32 oil temp.
IDK which is lifting internal bypass or relief valve on the block

Both OEM pumps and the melling are left hand threaded version
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mispeeling wrods n a thraed nere u
07.5 3500hd RCLB LMM GT4088R, 4.56 gears 225/70/19.5 efi live 478k broke block
99 FL60 8.3 12v 13sp
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  #50  
Old 05-14-2017, 09:54 PM
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Originally Posted by rcr1978 View Post
I will post up the gear sizes in the next day so we can get this strait, maybe measure your stuff if you can to Adam?
I noticed that my LLY carried higher pressure, as do other LB7/LLY's

My LMM only carries 38-42 cruising where the LLY was 48-55
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  #51  
Old 05-14-2017, 10:02 PM
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At what RPM Reger? I'm 60-70@2000 with worn bearings and aux oil cooler
28-32@750 idle
With a 316 pump
Main and rod bearings clearance was .0025" avg
The LBZ/LMM pumps was 45-50@2000 and low 20s at idle
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mispeeling wrods n a thraed nere u
07.5 3500hd RCLB LMM GT4088R, 4.56 gears 225/70/19.5 efi live 478k broke block
99 FL60 8.3 12v 13sp
Quote:
smooth seas never made a skillfull salior

Last edited by malibu795; 05-14-2017 at 10:09 PM.
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  #52  
Old 05-15-2017, 06:26 AM
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I thought I remember hearing the LB7 lifters had a additional lube hole for the roller on the lifter and the LBZ/LMM do not so if that's the case theres a lot less internal leaks on the LBZ/LMM.

Edit: LLY lifters may also be different from LB7
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04 LB7 ECSB Built motor, Wagler billet narrowed Rods, Callies billet crank, Mahle Race Cast pistons, Randy's Girdle, Wagler/Callies Stage 1 alterfire cam, Exergy 100% SAC's, dual CP3's, Randy's race ported heads, Profab cast flow/up pipes, and S475 over stock twins for now more later.
2010 LMM CCLB-Tuning/Exhaust
2015 LML Cab and chassis- Tuning/Exhaust

Last edited by rcr1978; 05-15-2017 at 06:35 AM.
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  #53  
Old 05-15-2017, 08:35 AM
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Quote:
Originally Posted by malibu795 View Post
At what RPM Reger? I'm 60-70@2000 with worn bearings and aux oil cooler
28-32@750 idle
With a 316 pump
Main and rod bearings clearance was .0025" avg
The LBZ/LMM pumps was 45-50@2000 and low 20s at idle
Mine won't see 50 until 2500+ RPM's.
Unless I'm reading my shit wrong.
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  #54  
Old 05-15-2017, 09:55 AM
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im still on my old stock pump with 213k. oil clearances were a bit more than Adams at .0026 to .0028. at 2100rpm and oil temps at 190 i see 65psi down the highway. this is still reading at the 01-02 oil pressure spot which guys seem to think reads higher than the 03-up. Idle at same temp its 25-30psi.

when oil temp starts going over 210, pressure starts dropping though. 240* at 2100rpm leaves me at 50ish psi.
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  #55  
Old 05-15-2017, 11:14 AM
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Both LBZ/LMM reads off #4 main..
My mechanical is hooked on #2
I lose 5-8# across my oil cooler
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mispeeling wrods n a thraed nere u
07.5 3500hd RCLB LMM GT4088R, 4.56 gears 225/70/19.5 efi live 478k broke block
99 FL60 8.3 12v 13sp
Quote:
smooth seas never made a skillfull salior

Last edited by malibu795; 05-15-2017 at 11:19 AM.
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  #56  
Old 05-15-2017, 11:25 AM
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Quote:
Originally Posted by malibu795 View Post
Both LBZ/LMM reads off #4 main..
My mechanical is hooked on #2
I lose 5-8# across my oil cooler
Clarrisa...
Between pump discharge and #2 main I loose 5-8#
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Adam
mispeeling wrods n a thraed nere u
07.5 3500hd RCLB LMM GT4088R, 4.56 gears 225/70/19.5 efi live 478k broke block
99 FL60 8.3 12v 13sp
Quote:
smooth seas never made a skillfull salior
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  #57  
Old 05-15-2017, 05:43 PM
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We stiffened the internal spring on a stock LLY pump that I drilled squirters on some years ago. It always read 60-70 on the Autometer and ECM pressure gauge above idle. Then I saw an LML pump, there is no comparison.

We decided to use LML pumps with LBZ med duty pans and front covers on the twin marine build. Had to shave part of the pump case down about .150, and then take a good bit off the threaded / geared input shaft. That got us inside the LBZ/LMM front covers. Upper pan needs a touch of dremel work too, but they fit

LML gears are a good bit thicker than earlier models, reason for the conflict. But the feed tube is also about 30% larger, so makes a worth while mod IMO.


P.S.. If using LML blocks, only the #4 hole has the new thread to match LML sensor. If you wanta keep your LB7/LLY/LBZ/LMM sensor, just move up a hole or two where the threads are same as all other models.

Last edited by kidturbo; 05-15-2017 at 05:49 PM.
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  #58  
Old 05-15-2017, 06:44 PM
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Here is a couple pics I found of an LML pump apart. On left LML gear, notice the longer shaft.

Also the pump clearance to front cover wasn't main reason we machined housing. Could have just notched the cover. After thinking we had it whipped, the LB7 cam gear we used hit pump on final assembly if I remember correctly. Will post a pic of housing machine area if I can find one.
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  #59  
Old 05-17-2017, 11:45 AM
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Default LB7 and Melling m316

LB7 and Melling gears are the same tried both sets in each housing.
Dia 26mm
Width 13mm
Shaft 19.95mm
I have pics of them will have upload later.
Also whoever has a Melling lay a strait edge across the back and see if it's recessed across the shaft area mine is not sure if it was intended to be machined that way or mines a pos.
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04 LB7 ECSB Built motor, Wagler billet narrowed Rods, Callies billet crank, Mahle Race Cast pistons, Randy's Girdle, Wagler/Callies Stage 1 alterfire cam, Exergy 100% SAC's, dual CP3's, Randy's race ported heads, Profab cast flow/up pipes, and S475 over stock twins for now more later.
2010 LMM CCLB-Tuning/Exhaust
2015 LML Cab and chassis- Tuning/Exhaust
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  #60  
Old 05-17-2017, 12:10 PM
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Default Relief valve pressures

Stock LB7 pump pops the seat at 55-56 psi
Melling 68psi
Now this is a air check and it is at the point it just cracks off the seat the releif port is not physically open much just enough to leak air, I have no idea what it would be with fluid pressure to actually be open enough to blead off a decent amount off fluid but should be close.
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04 LB7 ECSB Built motor, Wagler billet narrowed Rods, Callies billet crank, Mahle Race Cast pistons, Randy's Girdle, Wagler/Callies Stage 1 alterfire cam, Exergy 100% SAC's, dual CP3's, Randy's race ported heads, Profab cast flow/up pipes, and S475 over stock twins for now more later.
2010 LMM CCLB-Tuning/Exhaust
2015 LML Cab and chassis- Tuning/Exhaust
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