Resolve: Carnkshaft stuck after install head
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Resolve: Carnkshaft stuck after install head Hi, I'm rebuild the engine LQ9 from Cadillac escalade, but lower engine is stock crank piston and rod i didn't touch them at all.
Carnkshaft was turning free before install head, after install both head, is was tune little and feel hard, after trying to tune one lap it stuck very hard i didn't move, it appear when cylinder at TDS it stuck.
it did remove one head and didn't move only when remove both head it free to move. and did lubricant cylinder wall. only when both head on and torque bolt down it hard to move.
note that on valve and spring on head, didn't install rocket arm yet.
Carnkshaft was turning free before install head, after install both head, is was tune little and feel hard, after trying to tune one lap it stuck very hard i didn't move, it appear when cylinder at TDS it stuck.
it did remove one head and didn't move only when remove both head it free to move. and did lubricant cylinder wall. only when both head on and torque bolt down it hard to move.
note that on valve and spring on head, didn't install rocket arm yet.
Last edited by Henllan; Nov 1, 2025 at 03:35 PM.
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Joined: Jul 2022
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From: Alaska
Hi, I'm rebuild the engine LQ9 from Cadillac escalade, but lower engine is stock crank piston and rod i didn't touch them at all.
Carnkshaft was turning free before install head, after install both head, is was tune little and feel hard, after trying to tune one lap it stuck very hard i didn't move, it appear when cylinder at TDS it stuck.
it did remove one head and didn't move only when remove both head it free to move. and did lubricant cylinder wall. only when both head on and torque bolt down it hard to move.
note that on valve and spring on head, didn't install rocket arm yet.
Carnkshaft was turning free before install head, after install both head, is was tune little and feel hard, after trying to tune one lap it stuck very hard i didn't move, it appear when cylinder at TDS it stuck.
it did remove one head and didn't move only when remove both head it free to move. and did lubricant cylinder wall. only when both head on and torque bolt down it hard to move.
note that on valve and spring on head, didn't install rocket arm yet.
Serious question here…did you install headgaskets?
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I will add one thing, i did buy head gasket in the kit, the shop told me this will fit 4.8 5.3 6.0, but on the box was only 4.8 and 5.3.
I'm thinking this is this issue, i will order one for my engine and i will try
I'm thinking this is this issue, i will order one for my engine and i will try
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From: Louisiana
When you say you rebuild the engine, what exactly does that mean? You should list all parts you installed on the engine with part numbers, is the valve train stock? Did you install aftermarket parts? Is the cam stock? What head gaskets did you use? Why did you "rebuild" the engine? Your not going to get adequate help without going into much further detail, you cant just say i rebuild the engine and now its not turning over, that doesnt explain what you have done.
Thread Starter
Registered User
Joined: Oct 2025
Posts: 6
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When you say you rebuild the engine, what exactly does that mean? You should list all parts you installed on the engine with part numbers, is the valve train stock? Did you install aftermarket parts? Is the cam stock? What head gaskets did you use? Why did you "rebuild" the engine? Your not going to get adequate help without going into much further detail, you cant just say i rebuild the engine and now its not turning over, that doesnt explain what you have done.
engine is empty, no cam no timing etc.
