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Engine/Transmission (1994 - 1998) Engine knock

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2nd Gen Non-Engine/Transmission 2000 Dodge 2500

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Hope someone out there can shed some light on my problem...Truck is a 1997 2500 4x4 LB Auto Trans 167K on clock..Fuel plate installed by previous owner but do not know what number.Truck has enough gages, to not get into the trouble I'm in.
The Story: Pulling a 26' boat out of Page, Arizona ( I have done this many times in the past) Up a 3-4 mile grade. Let myself concentrate on a slow driver in front of me, instead of monitoring my gages. 3/4 up the grade I heard a rattle from the engine and it suddenly quit. I glanced at the water temp gage & it was a needle away from red, if not in the red. I immediately restarted the engine and crested the hill & all gages returned to normal. I did not look at EGT in my excitement. All seemed normal for the next 80 miles, but by the then I could hear a tick noise coming from the motor. I then drove about 100 miles uphill to Flagstaff & the truck ran great with all gages including oil pressure absolutely normal. By the time I reached Phoenix the tick had become a knock. My son used his truck to pull the boat from Phoenix to Southern California and I followed him at freeway speeds with everything normal except the noise was getting louder.
Once home I cracked all injector lines and at cylinder #5 the noise decreased 80%. I replaced #5 injector...with no change in the noise. Checked all valve clearances and all seems normal there. the knock sounds the loudest stand at the rear of the driver's side wheel well. I also note some blow by now that I had not seen before.
I'm thinking I damaged a piston or wrist pin, but would like to get some input before I pull the engine.
Any help would be greatly appreciated. Thanks.
OldFartnumber6
 
My gut reaction is "bellyache", and a bad one - hope I'm wrong. Were it me, I'd be considering a compression check, and leak-down test, but only after ruling out things like water pump, alternator, turbo, tensioner, fan clutch (basically anything that rotates, and has bearings).
My heart kinda sank when you said valve clearances were okay, tends to make a fella believe it's in the basement.
Best of luck!
 
hmmmmmmm, After thinkin' 'bout this a little, the very first symptom was high coolant temp. Maybe, just maybe, it's water pump, tensioner, fan clutch, or dampner pully.
Let's hope so.
 
Don't forget the lift pump can make make a knocking noise, but if the quieted down with # 5 shut off it does point to a problem with that cyl. without personally testing it I am just guessing though
 
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Found badly scuffed # 5 piston...cylinder does not look too bad..I plan on honing that cylinder and replacing number 5 piston, rings and rod bearing...Pulling engine no easy task.
 
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