Penta sx, 4.3l gl flooding 2,4,6,cyls.?

[wolf-pack]

--------------------------------------------------------------------------------
New to the forum, hoping for some insight. 2010 Rienell boat, 4.3l GL-J eng., SX-A 1.89 Penta drive. Nightmare boat!!! Engine replaced last fall, due to catastrophic fail. dealer said overheated, but didn't say why it did. Ran good for 5 days, then started having issues. Brother brought it back to dealer who replaced engine, they told him they replaced cap and rotor (2 plugs not firing), all good. He brings it to the lake, on the lake for 10 min., engine goes from 3800 rpm to 1200, idled back to dock. I removed cap, piece of cap material impeding center contact. Clear material/bakelite plastic, reinstall. engine runs the same, can hear pinging in engine. Back @ dock, I remove plugs, starboard side all black and wet, port side all clean/tan and dry. Replace plugs, good for 10 min., then same thing. Not ignition, not compression, Ideas? gonna check carb flow soon, just putting out feelers to see if anyone seen this before. Could plugged exhaust be cause? Thanks in advance, Neil.

 

[insttech1]

Re: Penta sx, 4.3l gl flooding 2,4,6,cyls.?

Is the "new" engine under warranty?
That's WAY too much BS to be happening to a 2010 boat.
They just replaced cap/rotor and you're pulling debris out of it? Big red flag right there....is the new one melting????
You say it's not ignition, and not compression, but you can hear pinging.
Almost sounds as if 3 cylinders are not firing at all, or are not timed right (somehow) w/ the distributor.
If it's under warranty, I wouldn't touch it.
If not, I would suspect something in the ignition system. Hopefully more people will chime in.

 

[wolf-pack]

Re: Penta sx, 4.3l gl flooding 2,4,6,cyls.?

Just got a look at this last night. Ran it up in the driveway, starboard side of the carb is dumping fuel, at all rpm? Gonna remove carb and investigate this weekend. Odd that a three year old carb needs attention?

 

[wolf-pack]

Re: Penta sx, 4.3l gl flooding 2,4,6,cyls.?

Took carb off this weekend, and while dumping the fuel out of it, could hear something other than the float rattling around in the bowl. Sure enough, take off the bowl and find one of the jets has fallen out of its hole! Reinstall, replace on engine, take it on the river, and after it clears itself of alll the fuel in the cyls., ran well. Now just have to change oil, and put a for sale sign on it! Glad it's not mine! hope this helps someone else.