starting problem

[alexprihodiko]

i have a 3.0 140hp mercruiser, on a 86 searay. i encountered a prblem yesterday will in the river. it was a s.o.b to start up. when the earmuffs are on its no prblem but in the water its another story. any remarks wat it could be?, i have the timing set right to 6, new coil, good fuel. once it starts it goes drives without a hitch, its the starting where my prblem lies.

 

[Bondo]

Re: starting problem

Ayuh,... Welcome Aboard,....

Have ya checked the sparkplugs, When it won't start, for spark, 'n fuel,..??

when the earmuffs are on its no prblem but in the water its another story.

I've seen/ heard of burnt up exhaust shutters fallin' down the pipe, 'n causin' such Issues...
Seems they can fall free on the muffs, 'n still plug the pipe in the pond....

 

[alexprihodiko]

Re: starting problem

havent replaced the plugs yet, ill give that a shot, the shutter is new just put it in.

 

[dubs283]

Re: starting problem

the shutter is new just put it in.

what about the old one?? did you find it lodged in the exhaust??

have you checked under the cap?? points, condenser, rotor?? dwell??

 

[Kevins2011]

Re: starting problem

1994 MerCruiser 3.0L I-L4 : We just ran into the very same problem on Saturday while out at the river. the engine started great and ran about 1000 to 2000 yards before I shut it down. Then roughly 5 minutes later I couldn't get the darn thing to start back up and we had to be towed in. I opened the Exhaust to look at the Shutter Valve and all looks good. The Exhaust Bellows going out from the Transom to the Outdrive is brand new and there are no trim tabs on the boat. What should I be looking for as my potential problem..?

 

[Diesel Mech]

Re: starting problem

I recently had this same issue, check your fuel pump for proper operation. I have a 3.0 also and had to take the fuel pump apart and clean it inside. Once it's removed, you should be able to operate it with your hand, (use a rag as a cushion, it won't be easy). Mine would barely move because the upper diaphragm was dry, I cleaned it, put some gear lube in the upper part of the housing above the diaphragm and am back running. Hope this helps