Duramax Diesels Forum Truck of the Week
  #1  
Old 05-30-2015, 09:45 AM
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Default Ticking sound

Well I got my 4 injectors done truck is way more responsive and at idle sounds nice. But at around 1800 rpm you can hear a ticking sound it will go away when at cruising speed but as soon as it hits a bit of a load it comes should I be concerned or not?? Thanks for any input. Motor is lb7 wasn't sure where to post this as it wouldn't let post under lb7
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Old 05-30-2015, 12:12 PM
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Did you torque the injector hold down bolts? If you did, what did you torque them to? A lot of times the injector may not be fully seated against the copper sealing washer resulting in a "tick" or "knock" under load which is cylinder pressure making its way passed the sealing washer. It's been a while since I did mine but I know I didn't go with stock torque numbers on the hold down bolts. Also before tearing back into it try adding some fuel additive. My injectors are noisy but seems if I add some stansdyne performance additive it seem to quiet em down a bit. Or try some 2 stroke oil.
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Old 05-30-2015, 12:25 PM
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Any codes?
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Old 05-30-2015, 03:55 PM
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Had the injectors done at a reliable shop that I trust and today I did add some 2 stroke to the fuel so I guess I'll see what that does. No codes at all
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Old 05-31-2015, 10:10 PM
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Moved.
I don't understand why guys still suggest adding two stroke oil to these trucks. That's for old injection systems, not common rail. 2 micron fuel filters don't allow much through.
Add a good lubricant/cleaner like Howes or Stanadyne. Works much better.

Do you have any tuning done to the truck? Is it injector rattle or something else maybe?
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Old 06-01-2015, 05:11 AM
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Complete stock no tuning I thought it might be injector rattle
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Old 06-01-2015, 07:31 AM
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Quote:
Originally Posted by LBZ View Post
Moved.
I don't understand why guys still suggest adding two stroke oil to these trucks. That's for old injection systems, not common rail. 2 micron fuel filters don't allow much through.
Add a good lubricant/cleaner like Howes or Stanadyne. Works much better.
I agree..
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Old 06-01-2015, 07:48 AM
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I had the same issue and it was a injector not sealing. Factory torque isn't enough for the hold downs. I bumped it up 10 lbs i think and its been good.
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Old 06-01-2015, 08:25 AM
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Quote:
Originally Posted by Bustedknuckles View Post
I had the same issue and it was a injector not sealing. Factory torque isn't enough for the hold downs. I bumped it up 10 lbs i think and its been good.

Oh great! I just did three sets lol.
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Old 06-01-2015, 09:25 AM
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Oh great! I just did three sets lol.
Haha, maybe its ok on stock trucks....
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Old 06-01-2015, 09:41 AM
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We have used the factory torque on the hold downs which is 37ft lbs and never had any issues here. Nothing to worry about Lee.
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Old 06-01-2015, 10:12 AM
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Originally Posted by Brent@LDS View Post
We have used the factory torque on the hold downs which is 37ft lbs and never had any issues here. Nothing to worry about Lee.
HAHA thanks man. should be putting # 4 in this week and #5 will be on order soon. thanks for the great service Brent.
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2005 2500HD dmax, CCSB, 4" exhaust, Built motor with Carillo's .020 over 16:5.1 piston with .075 reliefs, Socal 6480 alt fire cam, ported LBZ head's, Exergy 10MM pump Stock lly cp3 on the belt, 400% LBZ injectors, S471/87 compounded with a GT5541R 106MM Fleece billet charger Werhli fab S400 install kit with bridge and piping, Merchant Auto Billet push tubes, Socal Valve springs, Socal valve covers, Socal flex plate, Mishimoto black intercooler, DSP5, Air dog 165,

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1984 CJ7 Powered by a 2000' LS1 5.7L



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Old 06-01-2015, 10:57 AM
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[QUOTE=Brent@LDS;920161]We have used the factory torque on the hold downs which is 37ft lbs and never had any issues here. Nothing to worry about Lee.[/

I had 2 that were leaking compression past the copper and almost all the rest were not tight at all. I upped the torque to 45 and it felt alot better. Granted my truck is turned up a good bit which i guess could be the culprit.
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Old 06-01-2015, 11:00 AM
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[QUOTE=Bustedknuckles;920177]
Quote:
Originally Posted by Brent@LDS View Post
We have used the factory torque on the hold downs which is 37ft lbs and never had any issues here. Nothing to worry about Lee.[/

I had 2 that were leaking compression past the copper and almost all the rest were not tight at all. I upped the torque to 45 and it felt alot better. Granted my truck is turned up a good bit which i guess could be the culprit.

When is the last time you had your torque wrench checked or calibrated? what do you use?
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2005 2500HD dmax, CCSB, 4" exhaust, Built motor with Carillo's .020 over 16:5.1 piston with .075 reliefs, Socal 6480 alt fire cam, ported LBZ head's, Exergy 10MM pump Stock lly cp3 on the belt, 400% LBZ injectors, S471/87 compounded with a GT5541R 106MM Fleece billet charger Werhli fab S400 install kit with bridge and piping, Merchant Auto Billet push tubes, Socal Valve springs, Socal valve covers, Socal flex plate, Mishimoto black intercooler, DSP5, Air dog 165,

1986 K10 short bed LQ4/4L80E

1984 CJ7 Powered by a 2000' LS1 5.7L



2015 LTZ Z71 LML, CCLB 3500HD.
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  #15  
Old 06-01-2015, 11:53 AM
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[QUOTE=catman3126;920178]
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Originally Posted by Bustedknuckles View Post


When is the last time you had your torque wrench checked or calibrated? what do you use?
I use a Matco 3/8 drive that was probably a year old the first time i did it.
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