[Colin Logie]

I just got a call from the mechanic, he has done a compression check on my 7.4L MPI with 550 hrs on it. the readings varied from 100 to 110 psi. Should I be looking at a new power plant ? Can I get the season out of this one ?

[AirNavy]

It is low (normal is around 150 psi), but at least there's not a big split between any of them. That points to normal wear as opposed to specific damage. Sounds like it may be about rebuild time.

[300sflyer]

That seems like fairly low hours generally speaking for it to be worn out. Other than the low compression, are there any other problems with it? Does it run ok?

[Colin Logie]

Runs fine, does'nt use any oil, I would'nt have known the compression was out if the shop had'nt told me.

[300sflyer]

Hmmmm....

I wonder if the gauge the shop was using was accurate? If it were me, I'd get a second opinion, or check it yourself. Its not hard to do.

[Colin Logie]

Thanks, good advice, I'll do that before I open my wallet.

[300sflyer]

Reminds me of that old saying... "If if aint broke... don't fix it".