harleyram75
New Member
- Sep 25, 2025
- 1
- 0
- Truck Year
- 2017
Looking for some feedback here. My truck first started dropping 2 - 3 inches of coolant in the reservoir but I didn't see any signs of a leak. I replaced the 3-way bypass valve and thermostat hoping it was something simple. That didn't work. Suddenly I started hearing a knocking sound near. Ack of engine.
Took it to dealership and they said they think it's the flex plate and wanted $1800 to pull transmission and check it. Told them no thanks and took it to a reputable transmission shop. He listened to it and had a couple of other people listen to it and all agreed it's not the flex plate. So I took it to another local mechanic. They did a compression test and said it's a blown head gasket but unfortunately they can't repair it and I should take it to the dealership because they have to lift off the cab to repair. I called a couple of diesel repair shops and nobody will work on, all say same thing take it to a dealership.
My question is, first would the blown head gasket repair solve the knock or is it safe to assume that there will be other issues like a rod,lifter, injector, waterpump, etc. I know it's hard to tell without diagnostic work and digging into it.
Could I be looking at needing a new motor?
Truck has just over 100k miles on it.
Took it to dealership and they said they think it's the flex plate and wanted $1800 to pull transmission and check it. Told them no thanks and took it to a reputable transmission shop. He listened to it and had a couple of other people listen to it and all agreed it's not the flex plate. So I took it to another local mechanic. They did a compression test and said it's a blown head gasket but unfortunately they can't repair it and I should take it to the dealership because they have to lift off the cab to repair. I called a couple of diesel repair shops and nobody will work on, all say same thing take it to a dealership.
My question is, first would the blown head gasket repair solve the knock or is it safe to assume that there will be other issues like a rod,lifter, injector, waterpump, etc. I know it's hard to tell without diagnostic work and digging into it.
Could I be looking at needing a new motor?
Truck has just over 100k miles on it.