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I’m FINALLY completing the rebuild of my bottom end this weekend and Ibrealize I have no idea which side of the rod caps go towards the adjacent rod...
the rod should have 2 different sized chamfers, the smaller chamfer goes to face the other rod. The big chamfer goes toward the crankshaft to clear the radius.
the rod should have 2 different sized chamfers, the smaller chamfer goes to face the other rod. The big chamfer goes toward the crankshaft to clear the radius.
The rod caps also HAVE to go on the same rod. The bore is machined round with the Rod and cap assembled and torqued. Mixing the caps will be under the heading of "Not Good"
original never rebuilt engine? No. If you have 1 thru 8 stamped on rods and caps, it was done upon disassembly by someone who knew not to mix anything up.
Rods and their respective caps should be marked as matched sets and for proper cap orientation before being disassembled. Since that MUST be done, one would think that rod/cap manufacturers would mark them properly before sale.
Thanks all. I tried to post an image but I guess it didn’t work.
The pistons are attached to the rods and I engraved numbers on the pistons, rods and caps. I also marked an arrow towards the front of the engine on each piston top when I was clocking the rings; I just can’t figure out the orientation of the caps.
I’m going to read the article now.
Last edited by NewbVetteGuy; Mar 24, 2019 at 10:50 AM.
Thanks all. I tried to post an image but I guess it didn’t work.
The pistons are attached to the rods and I engraved numbers on the pistons, rods and caps. I also marked an arrow towards the front of the engine on each piston top when I was clocking the rings; I just can’t figure out the orientation of the caps.
I’m going to read the article now.
From your pic, I can't be sure ... ? Are your wrist pins floating in the Rod?
If you're just one fellow, building one motor at a time ... marking not necessary...
Because if FIRST you keep rod #1 with cap #1 and SECOND you look at their chamfers & keep them mated. Other characterisics like tangs also assist to keep orientation.
It's about paying attention to detail ... as it should.
Involve more folks & more motors into the mix and that's when marking is needed.
Whether true or not, don't know ... but there's an opinion shared by many pros that stamping or punching on rod / cap creates a stress riser which can precipitate a failure.
Some manufacturers are using laser-etching / EDM to mark.
Just keep in mind ... the crank journal has a radius (some larger than others) on each end of the shared crankpin surface; install the rod's relatively large chamfer adjacent to that radius. Understand why the radius & chamfer is there and pay attention to detail.
Anyone can do a job but not everyone is cut out to do it well.
So with the stock rods the chamfer appears to be identical on both sides; the “x” is stamped on both sides of the rod cap too.
The only difference I can think of is the tabs for the bearings cut into the rod and caps: are they supposed to be on opposite sides or the same side? (My best guess is opposite.)
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L82 rod caps reinstall: which way??!?
Very informative.
