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Intermittent knocking after replacing water pump

 
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Old 06 Aug 2016, 11:25 am
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Smile Intermittent knocking after replacing water pump

Hello guys. I just bought a used cruiser with 125,000 miles a couple of months ago. This is my first post so I hope it's in the right place. I have a question. I hope someone has ran into this problem before. It's a 2004 pt cruiser non turbo. It ran hot while driving so I replaced the water pump, timing belt, engine mounts, radiator and fan switch. Now for some reason, I get an intermittent knock that starts. I can drive for an hour at no problem, or sometimes right after warming up. If I shut off the engine, then restart. Sounds goes away until later it happens again. I've TWICE taken it back to the shop that did the work, but can't get it to knock while I'm there. Btw when shutting the engine off, the sound does not stop immediately. It slows to a stop after the engine stops running. Could this be a fan motor?
Any help is greatly appreciated.

Last edited by barzitt; 06 Aug 2016 at 11:28 am.
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Old 06 Aug 2016, 11:45 am
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Default Re: Intermittent knocking after replacing water pump

Does the knocking increase with rpm,s or does it stay at the same rpm's?
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Old 06 Aug 2016, 11:47 am
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Default Re: Intermittent knocking after replacing water pump

Welcome to the forum
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Old 06 Aug 2016, 12:30 pm
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Question Re: Intermittent knocking after replacing water pump

Thanks for the quick reply. Each time it has happened, I wasn't driving very fast, under 20 mph. I immediately shut it off. I'm trying to remember if it increases with acceleration. I think it does not increase. But in case I'm wrong, what would your advice be either way?
I'm sorry I can't be more specific. I was in such a hurry to shut it off and was afraid of making the problem worse.
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Old 06 Aug 2016, 12:42 pm
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Default Re: Intermittent knocking after replacing water pump

When the fan on my PT was going out, when I shut off the car, I could hear a squeaking noise coming from either the fan bearings or brushes as the fan wound down to a stop, almost what you are describing in the last part of your original post.
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Old 06 Aug 2016, 12:45 pm
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Question Re: Intermittent knocking after replacing water pump

Right, but mine is a knocking, or tapping. Not squeaking?
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Old 06 Aug 2016, 01:02 pm
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Default Re: Intermittent knocking after replacing water pump

Check your belt tensioner. Sometimes when they start to go bad, they'll jump and pop. Maybe that's what it is.
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Old 06 Aug 2016, 01:02 pm
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Default Re: Intermittent knocking after replacing water pump

I had this problem with my car last month. The fan melted were it mounts to fan motor and was cocked just enough that is was hitting the fan shroud. I diag it with car off spun by hand to duplicate the noise, went to pick and pull grabbed a na fan took fan off of it and put on my turbo fan assembly easy jod fan has a round push clip that mounts fan to fan motor.
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Old 06 Aug 2016, 01:05 pm
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Question Re: Intermittent knocking after replacing water pump

Cool I appreciate the advice. Could the tensioner knocking sound be intermittent?
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Old 06 Aug 2016, 01:06 pm
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Default Re: Intermittent knocking after replacing water pump

Just remember when taking fan assembly out in bolt the inlet tube on radiator 2 bolts hold it on fan assembly slides right out. Good luck keep us posted on your solution
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