Join Date: Oct 2009
Location: Middletown, DE
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I have a 08 truck in my shop with an excessively, 1-2/32nds cylinder ridge, worn number 8 cylinder and the valve guides in the heads are at least .020 over spec according to my machine shop. The truck has approx 70k on it.
The truck came in for misfiring and coolant consumption. I performed a power balance and relative compression check and found number 8 to be low with both. I did not perform an actual compression test as my shop doesn't have a compression tester for diesels.
The truck has been run with a programmer and a DPF delete for the better part of it's life however EGR has been left intact.
The customer has an aftermarket warranty and is trying to use that and I want to help them do so. What could cause the cylinder to wear so quickly and what would cause the valve guides to be out of spec already?
Also how can I accurately test the EGR coolers to see if they have a leak? I have filled the gas passages with water and used compressed air in the coolant passages and had no bubbles appear however the water level would change when air was added. Is that the coolant passages expanding?
Last edited by Smashed96gt; 01-16-2013 at 10:56 AM.