Big Blue24
Comp Diesel Sponsor
- Joined
- Jan 5, 2008
- Messages
- 6,320
Help me identify what's causing this engine to knock. It's a bone stock 2008 6.7 3500 dually 4x4 with 109,000 miles. It was used to plow snow by the previous owner.
Believe it or not, the knock will come and go away at times. No visible smoke from the tail pipe. No excessive blowby out the oil filler cap when running. The coolant is brown, I assume that's the new non-green coolant they fill these things with. The oil does not appear milky like it has coolant mixing, however, it does appear to have abnormal sludge build-up. Does the new coolant not leave a milkshake when it mixes with engine oil?
Check engine light is on, key dance will not pull up codes. The owner took it to a diesel specific repair shop and they said the code came up as a fault in the EGR system / O2 sensor. They wanted to dismantle the motor on the spot and luckily he walked away.
So what is it?
Dropped valve? Blown Gasket? Bent Rod? Spun Bearing? Piston Slap? Clogged piston jet and resultant melted piston?
[ame="http://www.youtube.com/watch?v=iBKEKuk5xgo"]http://www.youtube.com/watch?v=iBKEKuk5xgo[/ame]
Believe it or not, the knock will come and go away at times. No visible smoke from the tail pipe. No excessive blowby out the oil filler cap when running. The coolant is brown, I assume that's the new non-green coolant they fill these things with. The oil does not appear milky like it has coolant mixing, however, it does appear to have abnormal sludge build-up. Does the new coolant not leave a milkshake when it mixes with engine oil?
Check engine light is on, key dance will not pull up codes. The owner took it to a diesel specific repair shop and they said the code came up as a fault in the EGR system / O2 sensor. They wanted to dismantle the motor on the spot and luckily he walked away.
So what is it?
Dropped valve? Blown Gasket? Bent Rod? Spun Bearing? Piston Slap? Clogged piston jet and resultant melted piston?
[ame="http://www.youtube.com/watch?v=iBKEKuk5xgo"]http://www.youtube.com/watch?v=iBKEKuk5xgo[/ame]