Acert pistons

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Mxs_cat, Sep 11, 2020.

Sep 11, 2020 #1

Mxs_cat Bobtail Member

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Jun 1, 2019

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i recently had my acert rebuilt at an independent shop, i wanted to lower compression to 16:1 and had it reprogrammed for the delete.
The part # listed for the new pistons is 356-4787. Can anyone confirm this is the lower compression piston or is that a stock acert piston?
Thanks

Mxs_cat, Sep 11, 2020

Mxs_cat, Sep 11, 2020

#1
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Sep 11, 2020 #2

spsauerland Road Train Member

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Checking Cat TMI, used in cylinder pack 10R-6215. That is a 18:1 CR kit. You wanted 10R7172 packs.

spsauerland, Sep 11, 2020

spsauerland, Sep 11, 2020

#2

pushbroom, A5¢, 650cat425 and 2 others Thank this.
Sep 11, 2020 #3

Truck engine machinist Light Load Member

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Dec 2, 2011

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Just machine .080" off of the tops of the 18:1 pistons, and you have 16:1.

Truck engine machinist, Sep 11, 2020

Truck engine machinist, Sep 11, 2020

#3

spsauerland and 650cat425 Thank this.
Sep 12, 2020 #4

Brettj3876 Road Train Member

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I'd go back and raise hell about that

Brettj3876, Sep 12, 2020

Brettj3876, Sep 12, 2020

#4

Mxs_cat and spsauerland Thank this.