Piston Order on LQ4 Rebuild
#1
Piston Order on LQ4 Rebuild
I recently had the seal on the pickup tube fail and turned the #1 crank bearing. I own a shop and someone inadvertently moved the pistons and they got out of order.
The cracked rods do not have any piston numbers on them. Are there any other distinguishing marks to show where the pistons go on the rotating assembly.
Check out this video and see if can see the S, S1, 1S, and an S with two lines underneath, and an S with 1 line underneath.
This is my first LS type motor to rebuild and have already learned a valuable lesson on the cap numbering and direction. (1-2-3-4 face rear, 5 facing forward and the number 5 mark is on the opposite side as 1-2-3-4)
http://youtu.be/wFkRg0aFKJM
Jeff
Artisanautomotive@gmail.com
The cracked rods do not have any piston numbers on them. Are there any other distinguishing marks to show where the pistons go on the rotating assembly.
Check out this video and see if can see the S, S1, 1S, and an S with two lines underneath, and an S with 1 line underneath.
This is my first LS type motor to rebuild and have already learned a valuable lesson on the cap numbering and direction. (1-2-3-4 face rear, 5 facing forward and the number 5 mark is on the opposite side as 1-2-3-4)
http://youtu.be/wFkRg0aFKJM
Jeff
Artisanautomotive@gmail.com
#3
Don't think there are any markings to tell the difference if there is any. I think it would be fine to throw it together (could be wrong lol). I would just check side clearance on the rods after assembly.
Also, if you're putting ARP rod bolts in, check them with a dial bore gauge after. My rods went out of round when I used ARP's in mine, I had to have the rods re sized.
Also, if you're putting ARP rod bolts in, check them with a dial bore gauge after. My rods went out of round when I used ARP's in mine, I had to have the rods re sized.
#4
sn2,
What about the ARP bolts cause the rod to get out of round? I will just get the GM part number bolts or put the old ones back in to avoid the hassle.
I just wanted some extra security against losing a rod cap and messing up a good engine. But I don't want to have them resized then have to by more bearings.
What makes the ARP bolts, if properly torqued, egg the rod?
Jeff
What about the ARP bolts cause the rod to get out of round? I will just get the GM part number bolts or put the old ones back in to avoid the hassle.
I just wanted some extra security against losing a rod cap and messing up a good engine. But I don't want to have them resized then have to by more bearings.
What makes the ARP bolts, if properly torqued, egg the rod?
Jeff
#6
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sn2,
What about the ARP bolts cause the rod to get out of round? I will just get the GM part number bolts or put the old ones back in to avoid the hassle.
I just wanted some extra security against losing a rod cap and messing up a good engine. But I don't want to have them resized then have to by more bearings.
What makes the ARP bolts, if properly torqued, egg the rod?
Jeff
What about the ARP bolts cause the rod to get out of round? I will just get the GM part number bolts or put the old ones back in to avoid the hassle.
I just wanted some extra security against losing a rod cap and messing up a good engine. But I don't want to have them resized then have to by more bearings.
What makes the ARP bolts, if properly torqued, egg the rod?
Jeff
listen to people that do it for a living(although sometimes they will post here)
#7
I didnt want to have to ever open mine up again for a LONG time, so I had everything checked, bored and refit when I put mine together the last time.....all ARP bolts here.