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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 01-10-2016, 01:36 PM   #1 (permalink)
Speedy Gonzalez
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Knocking And other Issues After Head Gasket

After 6 long months with no diesel on my hands i got back to work on my truck and finally was able to start it. But to my surprise there was a very noticeable knock from the top end. Well no problem, go grab the laptop startup GMTD Scan Tech, and disable each injector. Well, it didn't disappear and it got louder with each disabled injector. There are no codes popping up, it runs better than it ever has, but could changing the head gasket really damage the engine? Or would leaving all the rockers and valves torqued to spec without cranking it and leaving it for 4 months collapse the lifters?

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Old 01-10-2016, 02:10 PM   #2 (permalink)
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Quote:
Originally Posted by Speedy Gonzalez View Post
but could changing the head gasket really damage the engine? Or would leaving all the rockers and valves torqued to spec without cranking it and leaving it for 4 months collapse the lifters?
I can't see that being the trouble but maybe 1 or more of the lifters did not sit right when they where put back in.

Just a thought

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Last edited by Freddyack; 01-10-2016 at 02:21 PM.
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Old 01-10-2016, 02:12 PM   #3 (permalink)
tugboat94
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Could be a collapsed lifter buuut it could be a million things might need more info. Solid knock noise hollow does.it get louder with rpm increase is it go away when engine is in gear warm change tone?
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Old 01-10-2016, 02:16 PM   #4 (permalink)
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you are right tugboat but in any case the heads might be coming off again
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Old 01-10-2016, 02:23 PM   #5 (permalink)
Freddyack
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One thought.......

It takes a bit of running to purge the air out of the injector lines & injectors. And until this is done, there is knocking.
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Old 01-10-2016, 02:49 PM   #6 (permalink)
Speedy Gonzalez
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Quote:
Originally Posted by Freddyack View Post
One thought.......

It takes a bit of running to purge the air out of the injector lines & injectors. And until this is done, there is knocking.
I suspected it was air, so I cracked each line loose and let it squirt some fuel out.



Quote:
Originally Posted by tugboat94 View Post
Could be a collapsed lifter buuut it could be a million things might need more info. Solid knock noise hollow does.it get louder with rpm increase is it go away when engine is in gear warm change tone?
The thing that's driving off the wall is it will disappear with increasing rpm, but disable an injector and it is a million time louder, I've never let the engine get over 140 fearing that may damage it

Also if I try driving it, and put my foot down on the pedal hard, you can hear it cutting out through the cracked exhaust manifold It never did that before, could it be the PMD.
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Last edited by Speedy Gonzalez; 01-10-2016 at 02:54 PM.
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Old 01-10-2016, 03:07 PM   #7 (permalink)
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Just a shot in the dark, is the crank pulley OK?
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Old 01-10-2016, 03:19 PM   #8 (permalink)
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Quote:
Originally Posted by Speedy Gonzalez View Post
I suspected it was air, so I cracked each line loose and let it squirt some fuel out.
IMHO, that won't clear all the air out.
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Old 01-10-2016, 03:21 PM   #9 (permalink)
Speedy Gonzalez
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The pulley and balancer are fine,the balancer is not cracked or rotted

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Old 01-10-2016, 03:22 PM   #10 (permalink)
Speedy Gonzalez
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What will, bleed all air? And wouldn't disabling the injectors at least lessen the sound if it's injectors?

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