Duramax Diesels Forum Truck of the Week
  #16  
Old 08-31-2008, 12:16 PM
custom8726's Avatar
custom8726 custom8726 is offline
Hotrodder
 
Join Date: Feb 2008
Location: Upstate N.Y
Posts: 2,786

Default

which way should the arrows be pointing?
Reply With Quote
  #17  
Old 08-31-2008, 12:19 PM
LBZrcks's Avatar
LBZrcks LBZrcks is offline
.........
 
Join Date: Jun 2007
Location: SoCal
Posts: 5,822

Default

Quote:
Originally Posted by custom8726 View Post
which way should the arrows be pointing?
towards the front iirc
__________________
17' Denali HD CCSB Z71 Stock

Previous Dmax's

06' Chevy 2500HD CCSB 4x4, EFI Live, PPE GT40/GTX45 Twins, Socal 60s, Mike L. Trans

08' Sierra LMM CCLB Z71, Mike L. Trans, EFI Live, McRat Racing Tune 12.97@102.73
06' Sierra LBZ RCLB 4X4, Mike L. Trans, EFI Live, McRat Racing Tune 12.25@111.30
06' Chevy LBZ CST 9-11 Candy Red and Chrome
04' Chevy LB7 FabTech 8" Suncoast III w/TTS Converter
Reply With Quote
  #18  
Old 09-01-2008, 07:40 PM
Turbo Buick 6's Avatar
Turbo Buick 6 Turbo Buick 6 is offline
...
 
Join Date: Jun 2007
Location: NE Pa
Posts: 3,893
Default

For those that don't know the wrist pins are not centered in the pistons but rather have a small offset to eliminate some of the side thrust. This is why many motors have left and right hand pistons (really the same, just 4 are installed upside down). I am assuming the D-Max is this way and thats why there are -->'s
__________________
4.5 CLUB
Member #2


06 2500HD LLY reg cab 4wd


Ever feel like lying, down inside a grave
Listen to the elegy, a buyer of the hate
Ever dance beside the devil, taste the barrel of a gauge,
Ever pull the trigger, the light begins to fade
Feel like slipping away

Last edited by Turbo Buick 6; 09-01-2008 at 10:18 PM.
Reply With Quote
  #19  
Old 09-01-2008, 08:22 PM
ripmf666's Avatar
ripmf666 ripmf666 is offline
Super Moderator
 
Join Date: Sep 2006
Location: Wentzville Mo
Posts: 15,301

Default

Yes I wasn't sure how much was different with the right to left on a Dmax, I called Guy and he said there is 30 thousands offset.This motor was already built once heads on and tqed,When I picked it up for my friend it was in the machine shop next to a mill that was running the motor had metal shavings stuck all over the rods and crank and bottom of the pistons,We tore it apart and found the crank was not turned and the bearings were scratched,Did not give 2 thoughts of the pistons since he had balanced it all he did was match the weights by swapping the pisons around and when we put everything back and then looked and felt dumb to see that 4 pistons were in the wrong hole.All is fixed now, Guess it was a good thing we took it apart from seeing the shavings since the heads were already on, Sucks for him that he has to get new head gaskets again and had to get new rod bearings. Better safe then sorry.
__________________
Name to come
2013 GMC Denali HD 2500 ccsb,100%stock,spray liner,B&W
Sold but not forgotten
Devil Girl 2006 2500HD LBZ Ex-Cab 4x4
11.53 @ 116.92 1.66 60's


Reply With Quote
  #20  
Old 09-01-2008, 08:23 PM
Turbo Buick 6's Avatar
Turbo Buick 6 Turbo Buick 6 is offline
...
 
Join Date: Jun 2007
Location: NE Pa
Posts: 3,893
Default

Quote:
Originally Posted by ripmf666 View Post
Yes I wasn't sure how much was different with the right to left on a Dmax, I called Guy and he said there is 30 thousands offset.This motor was already built once heads on and tqed,When I picked it up for my friend it was in the machine shop next to a mill that was running the motor had metal shavings stuck all over the rods and crank and bottom of the pistons,We tore it apart and found the crank was not turned and the bearings were scratched,Did not give 2 thoughts of the pistons since he had balanced it all he did was match the weights by swapping the pisons around and when we put everything back and then looked and felt dumb to see that 4 pistons were in the wrong hole.All is fixed now, Guess it was a good thing we took it apart from seeing the shavings since the heads were already on, Sucks for him that he has to get new head gaskets again and had to get new rod bearings. Better safe then sorry.
Too much $ on the line to gamble it all to try and save a few hundred $
__________________
4.5 CLUB
Member #2


06 2500HD LLY reg cab 4wd


Ever feel like lying, down inside a grave
Listen to the elegy, a buyer of the hate
Ever dance beside the devil, taste the barrel of a gauge,
Ever pull the trigger, the light begins to fade
Feel like slipping away
Reply With Quote
  #21  
Old 09-01-2008, 08:29 PM
ripmf666's Avatar
ripmf666 ripmf666 is offline
Super Moderator
 
Join Date: Sep 2006
Location: Wentzville Mo
Posts: 15,301

Default

Thats a fact
__________________
Name to come
2013 GMC Denali HD 2500 ccsb,100%stock,spray liner,B&W
Sold but not forgotten
Devil Girl 2006 2500HD LBZ Ex-Cab 4x4
11.53 @ 116.92 1.66 60's


Reply With Quote
  #22  
Old 09-01-2008, 09:31 PM
duratothemax's Avatar
duratothemax duratothemax is offline
<--- slippery roads
 
Join Date: Aug 2006
Location: Wyoming
Posts: 7,836
Default

Quote:
Originally Posted by Turbo Buick 6 View Post
For those that don't know the wrist pins are not centered in the pistons but rather have a small offset to eliminate some of the side thrust. This is why many motors have left and right hand pistons. I am assuming the D-Max is this way and thats why there are -->'s
also I think its because of the orientation/side of the oil cooling channels on the pistons. If you put a right piston on the left side the oil squirter doesnt squirt into the hole in the piston.

I THINK...

ben
__________________

2012 Denali - R&D testbed for upcoming new products.....
2005 Silverado LT - Blown up/broken too many engines and parts to care about making it fast anymore, so its back to mostly stock - The best names in the industry for parts/advice/help...MikeL.Guy-SoCal.Rob-ATP.Evan-Limitless.McRat.BigDipper.Bobo.Tony-RRDP.Fingers.Eric-MA.EFILive...


BT DieselWorks, LLC - EFILive tuning - Duramax/Allison/gasser STANDALONE HARNESSES - Allison lockup controllers - Allison tapshift kits - Digital DSP-5 switches - full assortment of great electronic improvements and gadgets for your GM truck/SUV

All products available for sale through our online store at www.btdieselworks.com

Be sure to "like" us on Facebook at www.facebook.com/BTDWorks
Be sure to "follow" us on Instagram @btdieselworks
Reply With Quote
  #23  
Old 09-01-2008, 09:37 PM
Turbo Buick 6's Avatar
Turbo Buick 6 Turbo Buick 6 is offline
...
 
Join Date: Jun 2007
Location: NE Pa
Posts: 3,893
Default

Quote:
Originally Posted by duratothemax View Post
also I think its because of the orientation/side of the oil cooling channels on the pistons. If you put a right piston on the left side the oil squirter doesnt squirt into the hole in the piston.

I THINK...

ben
Makes sence, never thought of that, just basic gasser stuff
__________________
4.5 CLUB
Member #2


06 2500HD LLY reg cab 4wd


Ever feel like lying, down inside a grave
Listen to the elegy, a buyer of the hate
Ever dance beside the devil, taste the barrel of a gauge,
Ever pull the trigger, the light begins to fade
Feel like slipping away
Reply With Quote
  #24  
Old 09-01-2008, 10:08 PM
ripmf666's Avatar
ripmf666 ripmf666 is offline
Super Moderator
 
Join Date: Sep 2006
Location: Wentzville Mo
Posts: 15,301

Default

Nope the oil squirters line right up.
__________________
Name to come
2013 GMC Denali HD 2500 ccsb,100%stock,spray liner,B&W
Sold but not forgotten
Devil Girl 2006 2500HD LBZ Ex-Cab 4x4
11.53 @ 116.92 1.66 60's


Reply With Quote
  #25  
Old 09-01-2008, 10:16 PM
Turbo Buick 6's Avatar
Turbo Buick 6 Turbo Buick 6 is offline
...
 
Join Date: Jun 2007
Location: NE Pa
Posts: 3,893
Default

IIRC the wrist pins in the pass side are offset upwards towards the center of the motor and the drivers side are offset downwards towards the fender. They are really the same pistons. The arrows are just there so you dont have to mic them out.
__________________
4.5 CLUB
Member #2


06 2500HD LLY reg cab 4wd


Ever feel like lying, down inside a grave
Listen to the elegy, a buyer of the hate
Ever dance beside the devil, taste the barrel of a gauge,
Ever pull the trigger, the light begins to fade
Feel like slipping away
Reply With Quote
  #26  
Old 09-01-2008, 10:20 PM
Turbo Buick 6's Avatar
Turbo Buick 6 Turbo Buick 6 is offline
...
 
Join Date: Jun 2007
Location: NE Pa
Posts: 3,893
Default

In theory you could use 8 pass or 8 ds pistons in the whole motor as long as you installed the odd four with the arrows forward and the writing upsidedown. I am only talking about wristpin offset tho, I don't know if there would be a prob with the oil squirters using 8 of the same pistons
__________________
4.5 CLUB
Member #2


06 2500HD LLY reg cab 4wd


Ever feel like lying, down inside a grave
Listen to the elegy, a buyer of the hate
Ever dance beside the devil, taste the barrel of a gauge,
Ever pull the trigger, the light begins to fade
Feel like slipping away
Reply With Quote
  #27  
Old 09-01-2008, 10:22 PM
JoshH's Avatar
JoshH JoshH is offline
Daggum farm truck
 
Join Date: Feb 2007
Location: Texas!!!
Posts: 12,810

Default

If you put them upside down the squirter isn't lined up with the right hole in the piston (the in is larger than the out).
__________________
06 Silverado 4x4 CC/SB

06 Express 2500 Duramax Van "The Dumpster"


Reply With Quote
  #28  
Old 09-01-2008, 11:16 PM
Turbo Buick 6's Avatar
Turbo Buick 6 Turbo Buick 6 is offline
...
 
Join Date: Jun 2007
Location: NE Pa
Posts: 3,893
Default

Quote:
Originally Posted by JoshH View Post
If you put them upside down the squirter isn't lined up with the right hole in the piston (the in is larger than the out).
Do after market pistons have provisions for oiling?
__________________
4.5 CLUB
Member #2


06 2500HD LLY reg cab 4wd


Ever feel like lying, down inside a grave
Listen to the elegy, a buyer of the hate
Ever dance beside the devil, taste the barrel of a gauge,
Ever pull the trigger, the light begins to fade
Feel like slipping away
Reply With Quote
  #29  
Old 09-01-2008, 11:17 PM
ripmf666's Avatar
ripmf666 ripmf666 is offline
Super Moderator
 
Join Date: Sep 2006
Location: Wentzville Mo
Posts: 15,301

Default

I think so not 100% sure
__________________
Name to come
2013 GMC Denali HD 2500 ccsb,100%stock,spray liner,B&W
Sold but not forgotten
Devil Girl 2006 2500HD LBZ Ex-Cab 4x4
11.53 @ 116.92 1.66 60's


Reply With Quote
  #30  
Old 09-01-2008, 11:31 PM
Turbo Buick 6's Avatar
Turbo Buick 6 Turbo Buick 6 is offline
...
 
Join Date: Jun 2007
Location: NE Pa
Posts: 3,893
Default

Nice, Like I said, I'm only speaking of the wrist pin orientation. I have never had the inside of a D-Max apart and am only speaking from general engine knowlenge But I am interested to learn as much as I can about all the "little things" so I'm a little more prepared when mine is in pieces......but then again....thats what I have you for Henry
__________________
4.5 CLUB
Member #2


06 2500HD LLY reg cab 4wd


Ever feel like lying, down inside a grave
Listen to the elegy, a buyer of the hate
Ever dance beside the devil, taste the barrel of a gauge,
Ever pull the trigger, the light begins to fade
Feel like slipping away
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

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 -7. The time now is 09:02 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
vB.Sponsors