Question about 1998 Chevrolet Tahoe

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Motor knocks ihave a 98 chevy tahoe and the motor knocks

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  • reuben mauch Feb 02, 2009

    i need to know if i can pull the crank out with the motor in the car?

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Hello;
Before you start to pull the crank out, check your oil pressure via an independent gage. Then if you have around 25-30 psi gage, drain some oil out. Put a quart of Marvel Mystery Oil in and top off . Change oil filter. Drive the truck for a few miles. Change the oil and filter. This should start to break away the sludge that is built up.

You may need to do this up to 10 times before you can go 3000 miles on an oil change.
Now if the oil pressure is extremely low, yes you can change the crank in chassis. I have done it in a pinch before. It is much easier to pull the engine and put a crank in. If the crank is bad, you also have a rod that is bad. You also need to clean all the parts or emminent failure will occur.
I would also change the knock sensors on your truck as well. Hope this helps. Rate me high.
Thanks;
Rich
RPM Northwest

Posted on Feb 02, 2009

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Hi have you checked your oil presure and level. if knocking then you will have bad crank or connection rod bearings that have faild.must replace all bearings and have crankshaft turned down

Posted on Feb 02, 2009

  • Raymond l Vincent Jr
    Raymond l Vincent Jr Feb 02, 2009

    yes you can but you will have to lift up motor high enough to remove the oil pan.once you get the pan out then place blocks of wood in between the engine and moter mounts.to keep it pu wile you remove the crank.

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