How important is order of connecting rods?

udoittwo

Seaman
Joined
Jan 23, 2014
Messages
73
Hello again,
Apparently the marker I used to lable my connecting rods didn't hold up too well. I have 2 rods that most of the marker came off. I believe they are in the correct order and I can make out most of the mark. I am 99% sure they are in the correct order but I was wondering, what is the importance of the correct order? The cyls have been bored, the crank polished, new pistons & rings, needle bearings, ect. On auto motors I've built, I have had to replace a rod for one reason or another and often just grabbed a used one and went over it and never was concerned or had a bad outcome.
There is no markings on the rods to differentiate. Just wondering?
Oh, I did make a painfull mistake that I only made once. I've only build motors using bushings. On those motors, when I would assemble the rod to the piston, I would put the retaining clip in one side to use as a stop for the wristpin. So, I did that. I used the peice of the wristpin to hold the needle bearings in place[worked great] then, as soon at I went to put the rod inside the piston I realized what I did. Because I don't have spare clips, I had to assemble it that way. Instead of 5 minutes, I spent an hour and a half trying to get it together. Finally, I took it all outside where I had excellent lighting and put it together on the first try. The other 4 went together in a few minutes each.
Hopefully, you can answer my ? on the rods. Although there is only a slight chance that 2 are switched, it bothers me.
Thtnka again,
Karl.
 

GA_Boater

Honorary Moderator Emeritus
Joined
May 24, 2011
Messages
49,038
I think the most important thing is keeping the rod and cap as a set. I've only worked on one motor that had unique rods per hole. Verify part #s are the same on all the rods, but I think you'll OK. BTW - What Merc OB are you working on in case we're both wrong?
 

udoittwo

Seaman
Joined
Jan 23, 2014
Messages
73
I'm working on a 1986 75 4 cyl. Mariner. I have kept the rods & cap bolted together allways, so I am not concerned about that.
 

Dukedog

Captain
Joined
Oct 6, 2009
Messages
3,439
Hello again,
what is the importance of the correct order? Hopefully, you can answer my ? on the rods. Although there is only a slight chance that 2 are switched, it bothers me.
Thtnka again,
Karl.

Like said, direction on needle bearing rod makes no difference but most usually put part # either up or down on all just because!

Tha "cracked" cap is what has ta be right!
 
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