6.2 that has not been run in a long time. has a knock

[84cucv1ton]

truck has 20k on it. been a long time since it has ran. dropped in batteries. checked the fluids. started right up. sounded great. im just getting out of the truck and then comes a loud knock. sounds like the driver side up by the rockers.

not sure what has happened. any ideas?? how could it be? with 20k on it.

as always thanks for the help

 

[FireFighterHill]

bad fuel would be my first guess

 

[YellowHammer]

My NG unit has a HMMWV that's had a knock that sounds like the piston will come through the block at anytime. We've been listening to that knock for about 5 years now. I've heard others that knock pretty bad and just keep going and going. It could be bad, but not neccassarily.

 

[2deuce]

My M1009 hadn't been started in about 4 years. It had some water in the crankcase probably from condensation. Did you change the oil before starting it? After mine started the ldle speed varied alot. It would race and die alot before it settled out. The linkage at the pump was real stiff too, the gas pedal was solid. If your valve train was dry something might have let loose before oil made it up there. I would pull the cover.

 

[84cucv1ton]

no i didnt chance the oil. didnt think i needed too.

 

[trucker 1954]

sounds like a dry cyl or liter hung might be a fuel knock put in fresh fuel change oil and fuel filters mine sat for how long some diesel clean in tank might help get things going in the pump as well 1986 m1028a1 contract 18.000 miles

 

[5_TON_TOMATOE]

Knocks

I just picked up my 1009 and when it cold, it sound like a few loose marbles rattling around. Gets better when warm, and runs great. Auction said cranks, but won't start. When I went to pick it up, it wouldn't even crank. Noticed a brand new starter relay in a box, plugged it in and drove it home- SWEET ! Wondered about the rattle- NORMAL?

 

[Crash_AF]

The rattle when first started is probably the cold timing advance, once warm, the engine should slow down and quiet down.

Later,
Joe

 

[dunedigger]

My M1009 has a loud rattle noise too. It's real noticeable but not always there when I start it up and I don't remember hearing it when I bought it and drove it home. I listened to the engine parts with a long screwdriver. On the valve cover it shoudns quiet. But when I put in on any injector, line or the fuel injection pump it has a real loud knock but not the rattle sound. I'd like to get it narrowed down but is hard to tell over the engine noise what exactly it is.

 

[Boner]

Maybe me have bad fuel...

bad fuel would be my first guess

How long would it take to run out a full tank on the m1009 at idle? Or is there something I can add to the tank to cure the bad fuel?

Thanks-forward

 

[san4rd]

Bad Knock

I had the same issue when I got my Federal Excess Property Vehicle for our fire department. A bad.. really bad gonna scare the neighbor kids knock.

I thought the motor was junk, and was looking for a replacement, when a farmer came over and started cracking the fuel lines to the injectors. First one.. still knocking, second still knocking... third.. it quit knocking! I replaced the injector and the problem was solved (a 35 dollar overhaul!)

I later found out it was from water in the fuel, as the tank rusted through.


Once I find out what vehicle it actually is.. I will post a question about fuel tanks and whether or not a replacement civilian tank will work.