2004 Endeavor 6G75 Compression Specification?

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02-13-2015, 08:47 AM

Ducati996

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Join Date: May 2012

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2004 Endeavor 6G75 Compression Specification?

I have a 2004 Endeavor XLS with the 6G75 engine that I recently rebuilt due to an unfortunate incident.
I had an exhaust leak and found the rear cat cracked and had to remove the intake plenum to access the cat for repair. Upon removal a hardened 5/16 washer unknowingly fell into #6 cylinder as I was removing the plenum which was not from the vehicle and caused piston damage and a resulting knock.

A compression test found the compression was 140, 150, (120 bad cylinder).
The vehicle had 200,000 miles on it but ran very good prior to incident.
I pulled the head and found piston and head damage only so I removed the engine for a rebuild.
I was very impressed with the overall condition of the cylinders and bearings. Honeing was visible in all but the very top of cylinders and the pistons pushed out easily. The bearings were in very good condition with the exception of 1 main bearing that had a very deep gouge from what looked like contamination during assembly but no crank damage.
I replaced all pistons & bearings and the valves in the #6 cylinder and lapped all of them.
Mitchell lists 225 psi as the new compression spec with 160 psi as the low limit.
After running the vehicle and several hot suppers to seat the rings I checked the compression and found 155 psi across the front cylinders.
What is the compression spec?

Thanks
90cummins