Ok Merc issues

macojoe · #1 11-06-2008, 07:31 PM

Ok motor started perfect at the ramp, we headed out, got about 5 miles out and it started to bog down?? Then it stalled? I restarted it and it stayed running, but after I took it down from 5000 to 4500. Then it cleared up and ran fine all day.

Then as you can see in the pictures it seemed to run hot all day?? The new Tstas were opening and it was peeing but always hot? This was trolling all day at 5mph, is this normal?? Should I take the Tstas back out?

Time to go home hit the throttle and got her to 4500 hot water went away in seconds, about half way in again it started to bog down?? Never stalled but would bog up and down for the next few mies thwen it clweared up and we were home.

What we did to the motor in Juy, changed the stator, a coil, recterfier, rebuilt the fuel pump - the ck vaules, cleaned all carbs and put all new gaskets.
Stator, recterfire, coil were used parts, the rest new.

CB and Mark both think it was a fuel issue?? The gas filter is there from the beginning of the season, 40 gal gas in it from 8/1 till now and I added stabil and another 60 gal gas before we went out.

Motor sounded great at 4500 and was pushing the Ox 4 guys all gear and 110 gal gas to 23 mph at 4500. My friend Mark said it was the best sounding Merc he has ever heard!! CB and I agreed, just need to fix this stuff!!
I like to get it fixed before I put it away for the winter so there is o problems when spring comes.

So what you guys think??

Thanks!

bigshrimpin · #2 11-06-2008, 08:03 PM

MJ - I think it's bogging cause it's not getting the fuel it needs at higher RPM (above 4500). Whether it's the fuel pump, carbs, or some restriction b/w the tank or motor . . . We'll have plenty of time to go through the entire system this winter and replace/rebuild everything. Those motors run HOT at lower speeds, you can add a H20 pressure gauge and a temp gauge to ease you mind. I run snipped tstats during the warm months, so the motor runs colder and pees right away . . . but you can flood the motor when starting (as I showed you almost everytime we went out) Hopefully Spares or Ferm will come along and chime in here.

chumbucket · #3 11-06-2008, 08:17 PM

Quote:

Originally Posted by bigshrimpin

MJ - I think it's bogging cause it's not getting the fuel it needs at higher RPM (above 4500). Whether it's the fuel pump, carbs, or some restriction b/w the tank or motor . . .

That's pretty much what I was saying. At speed I felt the primer bulb and it seemed to me that when the motor bogged, the bulb went a bit soft. Then it filled and hardened again. The only doubt I had was that it didn't seem to make a difference whether I squeezed the bulb or not. The motor would still quickly drop RPMs, then pick right up again.

bigshrimpin · #4 11-06-2008, 08:59 PM

MJ - Don't forget to remove that saltwater sprinkler system showering the motor while underway :)

THEFERMANATOR · #5 11-06-2008, 09:20 PM

My MERC ran just shy of 165 while trolling. At 2800 RPM's the temps would drop way down, but from 1000-2800 she ran about 160 and idle would run 145-155. Loopers need to run on the hot side at low RPM's to keep them from fouling plugs and burn the fuel. First thing is to take your filter off and drain it into a can or something and see what's in it. Also drain the float bowls on the carbs to see if some water made it into them. Did anybody try pumping the primer bulb when it would bog down? What kind of pump does that MERC have? The early MERCS had a big funky looking pump that would often fail, the later square ones are said to be ALOT more reliable.

spareparts · #6 11-06-2008, 09:22 PM

if it didn't make any difference when you squezed the bulb, then push the key in to chole the motor, if it picks up, you have a fuel issue between the fuel line and the intake, if it bogs down when you push in the key switch, it sounds electrical

macojoe · #7 11-06-2008, 10:16 PM

So the heat issue is normal, ok I just wanted to make sure!!

Therm, I planed on doing the filter and bowls, I am also going to replace the filter. The fuel pump is big and weird shaped so it must be the old one as you say??

Thanks spare thats easy ton do, thanks when I get it in the water thats just what I will do, if and when it bogs down again.

Ok Bs hurry up over!!

Thanks guys!!

Steplift 72' · #8 02-15-2009, 05:19 PM

Quote:

Originally Posted by bigshrimpin

MJ - I think it's bogging cause it's not getting the fuel it needs at higher RPM (above 4500). Whether it's the fuel pump, carbs, or some restriction b/w the tank or motor . . . We'll have plenty of time to go through the entire system this winter and replace/rebuild everything. Those motors run HOT at lower speeds, you can add a H20 pressure gauge and a temp gauge to ease you mind. I run snipped tstats during the warm months, so the motor runs colder and pees right away . . . but you can flood the motor when starting (as I showed you almost everytime we went out) Hopefully Spares or Ferm will come along and chime in here.

I vote for the restriction between tank and carb....along with a different winter gasoline formulation. The anti-siphon valve takes a couple ounces of pressure to open the spring.....The butane added in the fall up north, and the south in November causes vapor lock if you happen to have a anti-siphon valve with a slightly stiff spring. I've been there and got the T-shirt....boat would bog down past 4000 rpm and stall if you didn't quickly pull the throttle back. Figuring that one out wasn't cheap or quick.

macojoe · #9 02-15-2009, 05:44 PM

Thanks but all these issues have been worked out and it runs like new! Now if i can just get all the ice to melt i be fine!!

Steplift 72' · #10 02-16-2009, 04:00 PM

Quote:

Originally Posted by macojoe

Thanks but all these issues have been worked out and it runs like new! Now if i can just get all the ice to melt i be fine!!

The only ice we worry about around here is in the ice chest. I've seen hail piled up deeper than I've ever seen snow.