Proper Placement of piston rods in 2003 pontiac grand am

Asked by Feb 18, 2014 at 05:52 PM about the 2003 Pontiac Grand Am SE

Question type: Maintenance & Repair

When removing the pistons from a gunked up 3.4 L i didn't see that three were marked with the stamp A574 and three marked with B574. Does this mean they belong on one side or the other and which side if so?

1 Answer

4,765

Manufacturers have tolerances they want to maintain between the piston wrist pin and rod. They mark these "A,B,C" etc. If you're not changing rods, it's not really an issue. However... (and this is just from experience) ....if you didn't mark them when you took them out, I would not re-use them. It has nothing to do with the pistons. The rod journals 'mated' to the crank over the years and mis-matching them to a new journal can cause vibration and can shorten the bearing life, maybe by a lot. Do people do it anyhow? Sure. For the labor to put it all back together, and maybe do the whole thing again, I would replace the rods and pistons the first tim

Your Answer

Pontiac Grand Am Experts

  • #1
    tenspeed
    Reputation
    7,790
  • #2
    John Saffrahn
    Reputation
    1,610
  • #3
    Tom Demyan
    Reputation
    1,520
View All

Related Models For Sale

Used Pontiac Grand Prix
29 Great Deals out of 2,738 listings starting at $1,491
Used Pontiac Firebird
15 Great Deals out of 781 listings starting at $2,999
Used Pontiac GTO
13 Great Deals out of 476 listings starting at $5,995
Used Ford Mustang
726 Great Deals out of 38,098 listings starting at $895
Used Chevrolet Camaro
417 Great Deals out of 30,917 listings starting at $3,550
Used Pontiac Bonneville
3 Great Deals out of 526 listings starting at $1,799
Used Chevrolet Impala
515 Great Deals out of 34,210 listings starting at $950
Used Chevrolet Malibu
1,085 Great Deals out of 71,439 listings starting at $2,499
Used Honda Accord
1,119 Great Deals out of 62,342 listings starting at $1,199
Used Pontiac Sunfire
317 listings starting at $2,100
Used Honda Civic
796 Great Deals out of 73,925 listings starting at $1,400

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.