Cylinder Wall Anomaly
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Joined: Jan 2001
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From: Virginia
Wear. The cylinder wall wears in a tapered fashion. How much lip is on the very top edge of the cylinder? That is where the rings never touch and can give you a idea how much wear is in the engine. Over .006 of a inch wear, the engine needs a rebuild.
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5th Gear
Joined: Jan 2025
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thank you!
Appreciate the info, Franklin2. Image came from scoping the cylinders. And I'll be pulling that head off soon enough to see if theyll be added to my list.
(I just bought this truck, going through it while making a parts needed list)
(I just bought this truck, going through it while making a parts needed list)
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Joined: Nov 2015
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From: Angier, NC
Before pulling the head did the truck sit for a bit and if so how long? Are the other holes showing the same marks?
Have you done a compression test or leak down test? Both will tell you a lot about the motor.
If the 2 test fall within spec I would drive it and see if it goes thru oil or smokes.
That is unless you plan on rebuilding it then dont do anything else and just pull the motor and send it out for a rebuild.
Dave ----
Have you done a compression test or leak down test? Both will tell you a lot about the motor.
If the 2 test fall within spec I would drive it and see if it goes thru oil or smokes.
That is unless you plan on rebuilding it then dont do anything else and just pull the motor and send it out for a rebuild.
Dave ----
Cargo Master
Joined: Aug 2007
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From: New Zealand
I'm a machinist but not on engine rebuilding.
I don't know for sure.....it looks to me as if a mistake has been made & the boring bar was withdrawn from the cylinder, while still running.......leaving that spiral that hasn't honed out fully.
I don't know for sure.....it looks to me as if a mistake has been made & the boring bar was withdrawn from the cylinder, while still running.......leaving that spiral that hasn't honed out fully.
FTE Legend
Joined: Nov 2015
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From: Angier, NC
That is why I asked if the motor sat for a bit. The rings could have just started to rust to the wall leaving the marks.
That is why I also asked what the other holes looked like. Then again if the valves were closed on the other holes it may not show rusting.
If it was honing marks and the motor looks like it was just rebuilt, clean & painted I dont know why I would be looking in the holes? But I would then do a tear down and check everything!
Dave ----
Lead Driver
Joined: Apr 2002
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The score appears to be spiraling out like Ken said. I didn't notice that till he mentioned it. I haven't seen a series of ring wear up the cylinder wall like that. Just the top ring ridge.
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Cargo Master
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5th Gear
Joined: Jan 2025
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Appreciate everyones responses.
I will have more info to post in a couple weeks (been out of town). I'm the first person to touch this truck in 15 years and all I did was check some fluids and pull the plugs... work begins after its pulled in from the cold.
I will have more info to post in a couple weeks (been out of town). I'm the first person to touch this truck in 15 years and all I did was check some fluids and pull the plugs... work begins after its pulled in from the cold.
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5th Gear
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I tossed a bore scope into the spark plug hole initially due to where the truck was and what was available at the time. Compression ranged from 125-145 on 6 of the cylinders, #3 & #4 = 70. Lots of valve train clatter was eliminated after properly adjusting the preload on the valves, and compression went up on 3 & 4 to 95.
Clatter returned a.couple miles into the test drive. Confirmed timing was at 12, let the cool down overnight, this morning showed a hint of water in the oil and massive amounts of exhaust gasses coming out of the oil fill hole, pcv valve hole, and dipstick.
needless to say - heads are coming off and, fingers crossed, the rest underneath look OK.
This truck may just hate me.... as every part wants to break the moment I try to be nice to it.
Thank you, everyone, I will post some pics of heads and the cylinder walls as soon as I can get this truck back into the garage.
Clatter returned a.couple miles into the test drive. Confirmed timing was at 12, let the cool down overnight, this morning showed a hint of water in the oil and massive amounts of exhaust gasses coming out of the oil fill hole, pcv valve hole, and dipstick.
needless to say - heads are coming off and, fingers crossed, the rest underneath look OK.
This truck may just hate me.... as every part wants to break the moment I try to be nice to it.
Thank you, everyone, I will post some pics of heads and the cylinder walls as soon as I can get this truck back into the garage.
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Joined: Jan 2001
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From: Virginia
I tossed a bore scope into the spark plug hole initially due to where the truck was and what was available at the time. Compression ranged from 125-145 on 6 of the cylinders, #3 & #4 = 70. Lots of valve train clatter was eliminated after properly adjusting the preload on the valves, and compression went up on 3 & 4 to 95.
Clatter returned a.couple miles into the test drive. Confirmed timing was at 12, let the cool down overnight, this morning showed a hint of water in the oil and massive amounts of exhaust gasses coming out of the oil fill hole, pcv valve hole, and dipstick.
needless to say - heads are coming off and, fingers crossed, the rest underneath look OK.
This truck may just hate me.... as every part wants to break the moment I try to be nice to it.
Thank you, everyone, I will post some pics of heads and the cylinder walls as soon as I can get this truck back into the garage.
Clatter returned a.couple miles into the test drive. Confirmed timing was at 12, let the cool down overnight, this morning showed a hint of water in the oil and massive amounts of exhaust gasses coming out of the oil fill hole, pcv valve hole, and dipstick.
needless to say - heads are coming off and, fingers crossed, the rest underneath look OK.
This truck may just hate me.... as every part wants to break the moment I try to be nice to it.
Thank you, everyone, I will post some pics of heads and the cylinder walls as soon as I can get this truck back into the garage.
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