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Old 06-23-2012, 07:46 AM   #1 (permalink)
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Default Knocking Sound From Engine Bay

My 07 Reno (75k in miles) has a knocking sound everytime the engine is on. I recorded a video of it. It seems to be coming from the side of the engine where the serpentine belt is.
Knocking sound coming from engine - YouTube

Any Ideas what it could be before I take it to the Dealer?
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Old 06-23-2012, 09:24 PM   #2 (permalink)
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I am afraid to say that there is something wrong with the bearings and or rods. I hope the dealer can fix it under warranty. How do you drive the car?
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Old 06-24-2012, 02:41 AM   #3 (permalink)
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DJ

Unless you're fairly handy with the tool box you're off to the Mechanic but you might be lucky, it sounds more like you may have a problem with Timing Chain guides or a tensioner rather than bottom end woes.
How does it drive at the moment? Does it blow any smoke?

Good Luck

Doc
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Old 06-24-2012, 07:32 AM   #4 (permalink)
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Quote:
Originally Posted by Forenza Owner View Post
I am afraid to say that there is something wrong with the bearings and or rods. I hope the dealer can fix it under warranty. How do you drive the car?
Strange it just happened. MY car still drives fine. Do you think its cover by the powertran warranty?
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Old 06-24-2012, 07:33 AM   #5 (permalink)
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Quote:
Originally Posted by Suzukidoc View Post
DJ

Unless you're fairly handy with the tool box you're off to the Mechanic but you might be lucky, it sounds more like you may have a problem with Timing Chain guides or a tensioner rather than bottom end woes.
How does it drive at the moment? Does it blow any smoke?

Good Luck

Doc
Hmm..car seems to drive fine, I dont see any smoke but again I dont see any from my rear view mirror, I will have to let somebody drive it around and see if
I see any smoke.
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Old 06-24-2012, 09:57 AM   #6 (permalink)
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I agree with Suzukidoc, it sounds like one of the bearings in the idler rollers is bad. I recently replaced the head gasket and timing components on my Forenza and found one of the idler roller bearings was rough. Before I swapped it out, it would make a slight scraping noise until the car warmed up, which I could never find and it was driving me nuts!
I may be wrong on this, but I seem to recall reading a TSB that said there were some of these cars were equipped with a slightly longer water pump pulley, which tended to contact the inside of the plastic timing belt cover which distorts slightly over time, due to (normal) heat exposure. The dealer would swap out the water pump with a redesigned one that provided more clearance within the timing belt cover.
Good luck, I hope it isn't something too serious!

Edit: Sorry, couldn't find any such TSB for '07. Still think it could be an idler bearing or flayed timing belt slapping around in there, so be careful! These are interference engines and will bend valves in the event the timing belt fails!

PS: Come to think of it, check the serpentine belt and make sure it's not flayed, or something caught in the pulleys!

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Old 06-25-2012, 03:18 PM   #7 (permalink)
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Quote:
Originally Posted by P1NkY View Post
I agree with Suzukidoc, it sounds like one of the bearings in the idler rollers is bad. I recently replaced the head gasket and timing components on my Forenza and found one of the idler roller bearings was rough. Before I swapped it out, it would make a slight scraping noise until the car warmed up, which I could never find and it was driving me nuts!
I may be wrong on this, but I seem to recall reading a TSB that said there were some of these cars were equipped with a slightly longer water pump pulley, which tended to contact the inside of the plastic timing belt cover which distorts slightly over time, due to (normal) heat exposure. The dealer would swap out the water pump with a redesigned one that provided more clearance within the timing belt cover.
Good luck, I hope it isn't something too serious!

Edit: Sorry, couldn't find any such TSB for '07. Still think it could be an idler bearing or flayed timing belt slapping around in there, so be careful! These are interference engines and will bend valves in the event the timing belt fails!

PS: Come to think of it, check the serpentine belt and make sure it's not flayed, or something caught in the pulleys!
Thanks for the input. I did have my surpentine belt replaced around 40k due to bubbling, but I have not had the timing belt done yet reason dealer wants $800 plus to do it.
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Old 06-25-2012, 08:20 PM   #8 (permalink)
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the timing belt should be done every 30k. if it brakes you might kill the motor. the timing idler pulley has been known to make some noise. replace the pylley when you get the timing belt done if thats the problem it will go away.
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Old 06-26-2012, 09:08 AM   #9 (permalink)
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the timing belt should be done every 30k. if it brakes you might kill the motor. the timing idler pulley has been known to make some noise. replace the pylley when you get the timing belt done if thats the problem it will go away.
Thanks for the info, how hard would it be to change the timing belt myself? I have some basic mechanic skills. And would you suggest I buy the timing belt kit from ebay?
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Old 06-26-2012, 08:39 PM   #10 (permalink)
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It was a bit tricky for me to change mine, but I did it while retaining ~most~ of my hair.
Just make sure the engine is at top dead center on the compression stroke and Line up those timing marks accurately!

The camshafts tend to spring back a bit when the belt is off, so be sure to lock them in place with something or they'll be off by a tooth (trust me on this, I cursed up a storm). I "cheated" a bit (after waaay too many unsuccessful tries) by inserting an appropriately sized allen wrench between both camshaft sprockets' teeth.
When the sprockets are correctly lined up, you'll see the teeth form a sort of "valley" between them that looks like an allen key could fit in there and lock one against the other. After I did this, I was able to install the belt with no further profanity. :S

You could order the timing kit from RockAuto. The timing belt kit with tensioner and both idlers for your car is currently $80.99 + s&h.
I tried sourcing my timing kit from eBay, and RockAuto's prices with shipping were way cheaper. My kit had all the above + the water pump for ~$150 shipped!

Last edited by P1NkY; 06-26-2012 at 10:38 PM.
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