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Light Knocking Noise after engine rebuild

 
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Old 03 May 2017, 05:47 pm
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Default Light Knocking Noise after engine rebuild

This is a fresh rebuild for a 2004 PT Cruiser 2.4L(Non-Turbo). Engine rebuild included brand new connecting rod with new pistons, rod bearings, new crankshaft, main bearings, balancing shaft chain w/ tensioners, oil pump, timing belt w/tensioner, and cylinder head has new valves & new lifters. I'm getting a light knocking noise @ 2000rpms holding steady on throttle. Anybody ran into this issue before? Any suggestions or things to check to pin-point the knocking noise? Appreciate your help in advanced!
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Old 03 May 2017, 05:56 pm
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Default Re: Light Knocking Noise after engine rebuild

Not that many rebuilds on here. But you can as NitroPT. He is a ase master mechanic. It's hard to help site unseen. But he may be able to narrow it down.
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Old 03 May 2017, 06:54 pm
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Default Re: Light Knocking Noise after engine rebuild

Ok, got a call from Lynn (NitroPT). He is out for the evening. But wants to have you take a long screwdriver and try to see if it's the upper or lower part of the engine. You do that by placing the screwdriver on engine and put your ear to it. It will be louder as you get closer to the noise. That way we'll know if in the botten or the top. He'll check in as soon as life allows.
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Old 03 May 2017, 09:51 pm
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Default Re: Light Knocking Noise after engine rebuild

Did you adjust the balance shaft chain guide properly?
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Old 03 May 2017, 11:04 pm
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Default Re: Light Knocking Noise after engine rebuild

I adjusted balancing shaft chain to Factory spec.
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Old 04 May 2017, 12:14 am
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Default Re: Light Knocking Noise after engine rebuild

I subscribe to this thread Please keep us updated.....W..
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Old 04 May 2017, 08:16 am
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Default Re: Light Knocking Noise after engine rebuild

If a shop did this I would run not walk back and have them check it. Not many good things can be on a modern engine.

If sounds though like you may have done this yourself????

In any case good luck!!!
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Old 04 May 2017, 08:18 am
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Default Re: Light Knocking Noise after engine rebuild

The first thing to do is try to narrow down where the sound is coming from. So as recommended try to isolate at least the top(head) or the lower engine.




general information thread none specific use.


Balance shaft failure?
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Old 04 May 2017, 05:27 pm
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Default Re: Light Knocking Noise after engine rebuild

I want to thank you everyone for all your help. I'm going to recheck the balancing shaft chain. I will update if I found something.
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Old 13 May 2017, 04:41 pm
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Default Re: Light Knocking Noise after engine rebuild

I took off the oil pan. I checked the balancing shaft chain. The chain is loose on the left side where the guide is not adjustable. The right side with the adjustable guide, the chain was not loose. Does anyone know if there's a difference between OEM chain and Aftermarket chain? I have the aftermarket chain which does not have the 2 color marks like OEM chain.

The crankshaft is reman. or considered new. New main bearing and rod bearings are also new. Pistons and connecting rods are new as well.

Side note: The knock doesn't happen when the motor is cold, only noticeable when the motor is warm. Could I be possibly chasing the wrong thing??
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