stbd 454 340/mei merc.

Stripermann2 · Post by **Stripermann2** » Wed Aug 19, 2009 9:00 am

For what it's worth;

My friend's Crusaders had the same issue with his port engine. After inspecting the fuel system and changing all filters twice, I discovered his compression low in a couple of cylinders. After pulling the rockers, I could see that an intake valve had sucked up into the valve seat, (a quick tell- tale, is to straight edge the valve stem tops, with rockers off, they should all be aligned in height, none lower or higher) the companion exhaust valve was sticking in the valve guide.
After pulling the head, we found # 4 cylinder intake valve tuliped.
Although it seem to run fine at idle and rev under a no-load condition.

Basics, basics, basics...an 8 cylinder engine with weak cylinders will not giddy-up on 7 cylinders...or less.

Hopefully your problem is electrical or fuel. Good luck.

alexander38 · Post by **alexander38** » Wed Aug 19, 2009 3:25 pm

did a squeeze test and all 8 are with in 4 lbs of each other avg. 137 psi. thanks for the info if this does not work i'll pull the covers and start looking inside.

alexander38 · Post by **alexander38** » Mon Aug 24, 2009 4:34 am

well guys all is good ! 26 knots (gps)

prowlersfish · Post by **prowlersfish** » Mon Aug 24, 2009 7:18 am

So it was the fuel pump ?

alexander38 · Post by **alexander38** » Mon Aug 24, 2009 7:23 pm

yeap that was the final thing. it looked dry rotted when took it part. it'll get up and run now. ran it over to the light house and back saturday before all hell broke out on mobjack bay. and now going to replace the port one both are same age.