lq4 rods with lq9 pistions dont work
#1
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lq4 rods with lq9 pistions dont work
I got a early 99 lq4 engine. I bought a rebuild kit for a lq9 escalade. The engine shop pressed the pistons onto the rods. They did not use the retainer clips supplied with the flattop pistions. All seemed fine until i got the engine back into the car and the wrist pins all walked to one side of the block and busted the pistion and shattered one rod and crack another all cylinder wall are scared from the pins. Has anyone have or heard of the issue. This wrecked my intire build.
#4
Very few shops can survive working only on LS engines, and those that do prefer to use their known trusted suppliers and vendors, and charge accordingly, in cases of possible parts failures or labor errors, a certain amount is built into heir pricing to cover these mishaps. Most shops work on all makes and models and can't be experts on every single make and model of engine.
Last edited by lizeec; 04-10-2013 at 10:25 PM.
#5
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Sounds to me like the shop is at fault.
#6
I think press fit pistons are .945 pins and floating are .943. If op bought and lq9 kit it would have come with pistons setup for the floaters. So even if the rods were press fit the shop should have still been able to get the smaller floating pin in and the pistons should have had retaining clip slots in them. I believe the rods are the same so the shop should have put the clips in if the pistons came with provisions for them. This is one of the reasons I do this **** myself. This way the only one to blame is me and I don't have to wonder who else f'd up along the way.
#7
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I think press fit pistons are .945 pins and floating are .943. If op bought and lq9 kit it would have come with pistons setup for the floaters. So even if the rods were press fit the shop should have still been able to get the smaller floating pin in and the pistons should have had retaining clip slots in them. I believe the rods are the same so the shop should have put the clips in if the pistons came with provisions for them. This is one of the reasons I do this **** myself. This way the only one to blame is me and I don't have to wonder who else f'd up along the way.
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#9
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The pins are all the same diameter, it's the pin bore in the rods that are smaller to give it a press fit. The floating rods have a larger pin bore for clearance. The OP's parts selection is a moot point as the pins would have been the same diameter whether it was for a LQ9 or a LQ4. At this point, it still sounds like the machine shop did not check the pin fit and is therefore responsible for the failure.
#11
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I have never looked at an lq9 floating pin but floating pins that have seen in outboards slide smoothly in and out of the bore. The op says they were pressed in, this leads me to believe he tried to use press fit pins with lq9 pistons. Which again he should have checked and so should the machine shop
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kcs: i like the sig pic lol
#12
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I have never looked at an lq9 floating pin but floating pins that have seen in outboards slide smoothly in and out of the bore. The op says they were pressed in, this leads me to believe he tried to use press fit pins with lq9 pistons. Which again he should have checked and so should the machine shop
kcs: i like the sig pic lol
kcs: i like the sig pic lol
Glad you like my sig. It's a 700whp ZL1 that my company built.
#13
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Shop is gonna. Tear it down this coming monday and let me know something. Whether the block can be bored or is it needs replaced. My father uses them in bulk for toyota 22re heads and blocks so i firgure i would use the same bussiness. Im still a bit confussed. Would this not have been fine if the retainers were used? The lq9 rods are not pressed to piston. Just assembled by hand with retainers? So i need all new rods just to run the flat tops?
#14
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Shop is gonna. Tear it down this coming monday and let me know something. Whether the block can be bored or is it needs replaced. My father uses them in bulk for toyota 22re heads and blocks so i firgure i would use the same bussiness. Im still a bit confussed. Would this not have been fine if the retainers were used? The lq9 rods are not pressed to piston. Just assembled by hand with retainers? So i need all new rods just to run the flat tops?
#15
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I hear you. Pressed to rod. And on a floating pin (like the majority of pistons) you could slide it though the pistion and rod without the need to press and just install the retainers all by hand . These were pressed and i asked about the retainers not being installed. I beileve the simple fact that the retainers were not installed and he remembers me questioning that, they will do what it takes to make things right.
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#19
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I hear you. Pressed to rod. And on a floating pin (like the majority of pistons) you could slide it though the pistion and rod without the need to press and just install the retainers all by hand . These were pressed and i asked about the retainers not being installed. I beileve the simple fact that the retainers were not installed and he remembers me questioning that, they will do what it takes to make things right.