6.5 Diesel Clunk When Shutting Off Engine

RayGunSlayer

Member
31
12
8
Location
Fort Oglethorpe, Georgia
So when I shut my engine off I get a pretty loud clunk noise. I read some posts saying that it’s the crank puller or harmonic balancer. Well my crank pulley rubber is in great shaped with no cracks and I can barely move it at all when the engine is off. Like maybe a 1/4 of an inch. I don’t know how to check to see if it’s the harmonic balancer. Just curious if anyone else has had this problem before. I should also mention that it is not every time that i shut it off. Out of like 10 times it’ll happen like 6 or 7 times maybe
 
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Milcommoguy

Well-known member
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Rosamond, CA
I am not so clear on what your moving. Back and forth... side to side... left to right, round and around ??? etc. Might look around at alternator bolts, brackets... those things that drive off the belt or belts. Engine / transmission mounts. exhaust system. It's a guessing game from here. When shut down they do come to a quick stop.

Could be anything... got be something, CAMO
 
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RayGunSlayer

Member
31
12
8
Location
Fort Oglethorpe, Georgia
I am not so clear on what your moving. Back and forth... side to side... left to right, round and around ??? etc. Might look around at alternator bolts, brackets... those things that drive off the belts / belts. Engine / transmission mounts. exhaust system. It's a guessing game from here. When shut down they do come to a quick stop.

Could be anything... got be something, CAMO
The pulley that is connected to the crankshaft right in front of the harmonic balancer. It won’t move in any way except like trying to twist it clockwise or counter clock wise. I will definitely look at the other accessory drive pieces and see if any bolts are loose or anything. As far as engine and transmission mounts. They are both brand new, like 300 miles old, and fully tightened down. Everything comes to a complete stop when it’s shut off. Not like a sluggish or slowing down stop
 

Retiredwarhorses

Well-known member
Steel Soldiers Supporter
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Brentwood, Calif
this seems to be normal, I have many many hmmwvs, this noise seems to only be present on the older serp setup where there is no clutch pulley on the 200amp.
 

Gunnlogi

Member
34
6
8
Location
Arizona
My motor stops when i turn it off. It does not continue to run and shut off when it wants to. Newer serpentine belt models have a clutch in the alternator pulley, so it can slow down on its own, when the belt stops moving.
My 200amp will spin down after I turn off the engine, but it's sounding like it's dragging for lack of a better term. I don't think that's normal (for me with this truck it has done it since I purchased it, but in thinking the bearings are going?)
 
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