Hey guys need some help. Rebuilding an 2015 lml that had cracked pistons. Got a set of mahle motorsports pistons part # 930036055. After installing a few found that the crank counter weights are hitting bottom of the pistons. Where did I go wrong or how do I fix. Thanks Anthony
Mahle motorsports pistons hit lml crank
- Thread starter Tothemax
- Start date
Rods looked fine. Haven't measured piston protrusion but looks less then stock. Can tell you pin height on these mahle pistons is higher than the stock lml pistons and more material under pin than stockers
930036055 is advertised as a stock replacement. You might call the selling vendor or Mahle and see if they understand why you would have a problem like this. You have checked to make sure that the pistons oriented correctly? I'm sure you did, just had to ask.
Yes triple checked pistons. Was my first thought but fortunately unfortunately there on right.
I belive they did cause the pin height is higher towards the top then the lml pistons. The mahle ones are closer to lbz pistons. Also if you look up basic stock replacement pistons from mahle they say 11-16 not 01-16
Direct from Mahle and also repeated by many resellers
https://www.mahle.com/en/search/?q=+930036055
GM 6.6L Duramax Cast Performance Pistons
Revised casting with improved crown geometry and Performance bowl design, coated skirt - Ring Set (40xxMDK-D) Included
CH reduced 0.010" - Fits LB7, LLY, LBZ, LMM, LGH, LML
CR calculated with 0.012" piston protrusion above deck and 0.037 x 4.115" head gasket
6.5cc
403 4.055 3.898 6.417 1.951 1.358 -40.7cc 864 16.6 M142 0.500 0.0016 0.0023 930036055
407 4.075 880 16.8 930036075
411 4.095 896 17.0 930036095
https://www.mahle.com/en/search/?q=+930036055
GM 6.6L Duramax Cast Performance Pistons
Revised casting with improved crown geometry and Performance bowl design, coated skirt - Ring Set (40xxMDK-D) Included
CH reduced 0.010" - Fits LB7, LLY, LBZ, LMM, LGH, LML
CR calculated with 0.012" piston protrusion above deck and 0.037 x 4.115" head gasket
6.5cc
403 4.055 3.898 6.417 1.951 1.358 -40.7cc 864 16.6 M142 0.500 0.0016 0.0023 930036055
407 4.075 880 16.8 930036075
411 4.095 896 17.0 930036095
I have seen this. I'm wondering now what they mean by fit lml lol. It fits in the hole but stops after that. I feel I'm missing info like fits lml if you run different rods or crank.
Well dam looks like time to pull rods back of and make some measurements
The lmls you did used lml rods and crank?
Do you remember how close the skirts came to the counter weights? The ones that don't touch on mine still look Uber close
I did use stock LML rods and crank. I didn't measure the distance, but I know they didn't touch.
Yes waiting for reply from mahle. Sending rods to machine shop to see if somehow I have 8 equally short rods
Was the block decked? If the rods truly are short, I don't see how you'd still get .012" protrusion on the stock piston. When Mahle lists them as -.010 CH I believe it's taken off the top, not by relocating the pin