Mariner 115 No Start...

[jrbdjb]

I bought a trashed boat to get the good 1978 115 Mariner to put on my pontoon. Got it running while still on the old boat, started great and sounded good. Pulled the 115 off the old boat and put it on a stand while I rebuilt the pontoon transom. After a month or so I mounted the Mariner on the pontoon and got everything hooked up. Tried to start it and nothing. Turns over good, but no smoke, no backfire, nothing. Spark jumps a 1/2 " tester gap, 145 +/- a couple of pounds compression on each cylinder, timing is dead on. Checked each cylinder, all are getting spark. Primed each cylinder with gas/oil mix. Nothing. Any ideas?

Thanks!

 

[racerone]

With what you say you have done it should at least pop when cranking it over.-----I say the timing is off.---What is the serial # of this 1978 Mariner 6 cylinder inline engine ?

 

[jrbdjb]

That was my thought racerone, but turning the engine over buy hand #1 fires very close to 5 degrees btdc. I the don't have the s/n with me, but it has the cdi single coil distributor ignition. And it started great before I pulled it off the donor boat and put it on a stand for a month. I'm perplexed on this one.

 

[The Force power]

I would check the wiring to your controls as that's the only thing you "disturbed" with the transfer Maybe???

 

[Chris1956]

OK, are the spark plug wires on the correct cylinders? The cap should have numbers mounded to help you. Are the spark plug wires arcing to ground?

That motor should run on 3 cylinders w/o issue. Since she won't pop, you have something wacky going on.

 

[QBhoy]

I’d check your HT leads....and your compression gauge too...haha.

 

[Texasmark]

If no pop the plugs aren't firing even though you have fire, fuel, and timing. They may fire in the open but not under compression.....you didn't say how you tested for "good spark" after your gap jumping test. Are your plugs wet or dry? if wet, at 2 bucks apiece no big investment and thinking hard about what you said, you may have flooded it with your fuel related actions and the plugs are too wet to fire. If dry, you haven't primed it adequately even though you primed each cylinder with gas/oil. Other thing could be throttle setting....where is the throttle set during your starting procedure? Fast idle on that control box? Squeeze bulb pump up tight? Got the choke-fuel enrichment on? Fresh gas and oil with "no water"? I don't remember if my tower had drain plugs on the bottom of each carb or not. If so, drain the carbs and see what you get. With the plug out squeeze the primer bulb and ensure that it makes fuel run out.

I remember my 115 tower liked it's fuel to start.