moparnum5
New Member
As my sig says, I have the little 3.0l Alpha 1 gen II combo. The motor has always had a little lifter noise, but I've had motors that clacked for years with no real ill effect.
So I was testing SS props the other day and I was trying a prop that had a lot less pitch then stock (17P vs. 21P) to see where my limits were with RPMs. I had the boat cruising at 4800rpm, which I understand is the safe upper limit for these motors, when the rpms started to drop for no apparent reason. I pulled the throttle back and sure enough the motor was knocking loudly. I putted straight back to the dock and pulled it out for the day.
I did a compression test and got consistent high results across all cylinders. (180ish which I thought was high, but it was consistent across them all)
The spark plugs were all in great shape, and all valves moved as they should.
Then only indication of trouble is a squishy lifter on the last valve. A blown lifter seems to be an odd problem; however it seems to be the issue. That being said, is there any easier way to change the lifter without removing the head?
So I was testing SS props the other day and I was trying a prop that had a lot less pitch then stock (17P vs. 21P) to see where my limits were with RPMs. I had the boat cruising at 4800rpm, which I understand is the safe upper limit for these motors, when the rpms started to drop for no apparent reason. I pulled the throttle back and sure enough the motor was knocking loudly. I putted straight back to the dock and pulled it out for the day.
I did a compression test and got consistent high results across all cylinders. (180ish which I thought was high, but it was consistent across them all)
The spark plugs were all in great shape, and all valves moved as they should.
Then only indication of trouble is a squishy lifter on the last valve. A blown lifter seems to be an odd problem; however it seems to be the issue. That being said, is there any easier way to change the lifter without removing the head?