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Old 10-12-2015, 09:28 AM   #1
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Bad knocking after cams install

Heyy everyone
My mechanic install cams and valve springs and retainers in my mustang GT 4.6L V8
After everything was done he started the car and the mehcanic pump the gas paddle on a cold start

The engine has 58,000kilometers on it and it is well maintained engine oil changes were done on only 1200kilometers

The car was fine until i went on a test drive and after few minutes i heard this loud bad metal sound coming from my engine and oil pressure gauge was going all the way to Low oil for few minutes and then was coming back normal for few secs

The car is tuned by SVE on SCT x4 tuner

Just wondering if its a rod they are rated at 400HP
With my this setup full boltons exhaust cams my car would be making around 300whp which is normal for this engine.

Any suggestions what to do now


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Old 10-12-2015, 09:37 AM   #2
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That should not be the rods.. I would assume the timing chain tensioner is messed up in some way. That would give you a bad metallic sound and can/will interfere with oil pressure, since that is how the timing chain tensioner is actuated.
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Old 10-12-2015, 12:24 PM   #3
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Its a rod bearing. So can i only change bearings?


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Old 10-12-2015, 12:38 PM   #4
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You can if it didn't damage the rod journal on the crankshaft.

Your car has very low miles. I wouldn't have expected a bad rod bearing. Especially at the power level that you are at.
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Old 10-12-2015, 02:41 PM   #5
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How did you confirm that it was a rod? Glad you found the problem.


And yeah you can simply replace the bearings. It is worth a shot in a lot of cases, but it is not guarantee. You will want to make sure that the journals are not damaged, as straybullit said. If those are damaged, the rod bearings will fail again.


I am suspicious about the cause of this failure, considering engine work had been performed so recently. I would give that shop a call and try to get them on your side so you can work out a solution together.
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Old 10-12-2015, 05:07 PM   #6
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The guy who install cams i called him home he checked the car and said its a rod bearing knocking.It gets worst when car warms up and oil pressure gauge stays on low. Even i am surprised that a rod bearing failed! At this power and at this stage
I hardly drive the car i got it brand new since then its around 36000miles which is around 58k kilometres driven
Its a UAE spec car.



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Old 10-12-2015, 05:32 PM   #7
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If it knocked a bearing out it most likely egged the big end of rod and probably crank too. If mine i would pull it and do job correctly. Don't run any more or you might make a big wondow in side of block.unless you were hammering it hard when bearing went would insist mech. Fix his screw up.PULL TIMING COVER AND SEE IF HYDRAULIC TENSIONER PLURGED OR WASN'T INSTALLED RIGHT
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Old 10-12-2015, 05:56 PM   #8
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Guarantee you its a tensioner..

I just installed mine 2 weeks ago and it did the same thing passenger side tensioner wasn't plunging like it was supposed to and knocked
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Old 10-12-2015, 06:08 PM   #9
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Guarantee you its a tensioner..

I just installed mine 2 weeks ago and it did the same thing passenger side tensioner wasn't plunging like it was supposed to and knocked
I would DEFINITELY look into the cam chain tensioners and guides BEFORE disassembling the bottom end of the engine.
Your engine has too low of miles to not suspect that the knocking is caused by something that was done during the cam swap. You should at least get a second opinion on the source of the noise.
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Old 10-13-2015, 03:10 AM   #10
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You guys are right, i just told him to check belt tensioner before changing rod bearings. Thanks guys i will post once we open the engine again tomorrow hopefully
And seriously you guys are awesome and thank you all for the help


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Old 10-14-2015, 01:53 AM   #11
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It was a tensioner !


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Old 10-14-2015, 02:03 AM   #12
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Can i ask something here
i have 2005 mustang GT and when car is not start you can shift all the gears but once its start u cant. Anyone have idea what it is
Ive replaced it with exeddy clutch and clutch cylinders both but no luck


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Old 10-14-2015, 06:52 AM   #13
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if you can shft it just fine off, but not when it is running, it sounds like the clutch cable is loose, or not set right. pressing the pedal is not disconnecting the clutch from the flywheen.
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Old 10-14-2015, 08:21 AM   #14
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if you can shft it just fine off, but not when it is running, it sounds like the clutch cable is loose, or not set right. pressing the pedal is not disconnecting the clutch from the flywheen.
The S197 are hydraulic clutch lines instead of a cable.
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Old 10-14-2015, 09:12 AM   #15
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And it's not the belt tensioner it's the timing chain tensioner. Hopefully he knows that
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Old 10-14-2015, 10:48 AM   #16
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All of them? That's what I thought, but someone told me the 05 was still a cable. Is it just the 4.0 that uses a cable?

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Old 10-14-2015, 06:15 PM   #17
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Quote:
Originally Posted by Ahmed ali khan View Post
Can i ask something here
i have 2005 mustang GT and when car is not start you can shift all the gears but once its start u cant. Anyone have idea what it is
Ive replaced it with exeddy clutch and clutch cylinders both but no luck


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Did you bleed the clutch to remove the air from the slave cylinder?
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Old 10-14-2015, 07:05 PM   #18
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Open bleeder on slave and go drink a cold one. Have someone push pedal to floor and hold down while you close bleeder. Clutch should work now. If not keep bleeding till you get rest of air out
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