Piston Order on LQ4 Rebuild
Thread Starter
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Joined: May 2012
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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
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.
Thread Starter
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Joined: May 2012
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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
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Joined: Mar 2004
Posts: 513
Likes: 1
From: LONG ISLAND, NY; MADE IN THE USA
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)
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They don't...best way is to install the rings off each piston in each hole and check the end gap, and measure the piston and then measure the bore And see where they fit best according to specs.
Otherwise, bore it and install oversized pistons.
Otherwise, bore it and install oversized pistons.
