Evinrude 70hp # 705738 - South Africa

[garyjones]

Help please, in darkest Africa we have no manuals, no parts and no technichians!!!<br />Here is the history of the problem. I purchased this motor nearly a year ago, it was a swine to start for about 20 outings, it then died whilst trolling and wouldn't start again. I took it to the Evinrude dealer 800 miles away, and had a complete check and service, which cost serious money. When it came back it was just as bad to start. about 10 outings after this it suddenly came to life and would start first time every time with just half a crank. this continued for about a further 10 outings, then on the weekend whilst on warm up idle in the dock it died again and hasn't started since.<br /><br />The diagnostics are:- Fuel and carburation are fine, Plugs are wet on cranking. No spark to any plugs. Wiring checked and looks OK. Cannot remove crank wheel so do not know status under the crank wheel, nothing looks broken etc from the outside.<br /><br />I am pretty good with car engines but do not understand outboards at all, what is the function of the power-pack, the heat sink directly above it etc. Without manuals the diagnostics are a nightmare. I suspect that it is something very minor to loose all spark but obviously critical, Fuse is OK, is there only 1? Could problem be at the ignition switch ( it cranks realy strongly, just no sparks). Please help me with an idot's diagnostic process to get it going.<br />Thanks

 

[Trent]

Re: Evinrude 70hp # 705738 - South Africa

Check this out....... web page

 

[garyjones]

Re: Evinrude 70hp # 705738 - South Africa

Thanks for the site, it is very informative, but highly technical. I appreciate it but could use some help on where to start, how to get the flywheel off, and what to expect underneath when I do?

 

[Hooty]

Re: Evinrude 70hp # 705738 - South Africa

Hey Gary,<br />At this point, you really need a manual for that engine. After market manuals are available here at the iboats web site or an OEM manual from Ken Cook Marine Publications. If you don't have a manual, it makes it almost impossible for us to help ya.<br /><br />g'luck & c/6<br /><br />Hooty

 

[G. Patton]

Re: Evinrude 70hp # 705738 - South Africa

Gary..... Pertaining to a flywheel puller, you would need a puller that has slots (holes) in it whereas you could insert bolts down through it and into the three threaded holes that you see surrounding the flywheel nut. The method is to tighten the threaded center puller shaft as tight as possible, then hit the top of that shaft with a hammer. The shock of that will free the flywheel.<br /><br />NOTE... Be absolutley sure to torque that flywheel nut upon reasembly to exactly 105 foot pounds. Any less, it will come loose and shear the flywheel/crankshaft key. Any tighter could damage the taper etc.<br /><br />The intermitent loss of ignition, then good ignition for awhile, then no ignition, would lead me to think that you have a faulty intermittnt ignition switch. A simple test is this.<br /><br />Remove the black wire that has a yellow stripe (black/yellow) from the back of the ignition switch. This eliminates the kill circuit to the powerpack. If you now have ignition and the engine runs, replace the ignition switch. NOTE, with this black/yellow wire removed, it will be imposible to kill the engine via the ignition switch.<br /><br />If there's no improvement, remove the s/plugs, disconnect the main RED electrical plug at the engine, crank the engine and check the spark. If you now have spark, there's a short in the instrument harness (somewhere) from the engine to the ignition switch.<br /><br />If no improvement, the powerpack has failed, or the stator/charge coil under the flywheel has failed. The stator under the flywheel has small coils that are for charging the battery. It also has three larger coils that supply 300 AC volts to the powerpack, in essence it is the beginning of the ignition system. With the flywheel off, a problem is usually obvious if the stator has failed as it is usually cracked and has substance oozing from it, dripping down on the block.<br /><br />Let me know what you come up with here, and also at my e-mail address if you don't mind. <br /><br />patton5414@aol.com

 

[garyjones]

Re: Evinrude 70hp # 705738 - South Africa

Thanks very much for all the info. I suspect the ignition switch, but am nervouse about splitting the forward control box housing the swith. I have seen an exploded diagram and want to avoid the risk of springs etc flying out when I do split it.<br /><br />Can I disconnect the kill wire at the power pack? and once it does start how do I then safely kill the engine?<br /><br />I will keep you posted as to progress. From where I can see the stator, there is no oozing and no obvious cracks, so I'll start at the kill switch!<br /><br />Thanks again.

 

[G. Patton]

Re: Evinrude 70hp # 705738 - South Africa

Gary.... I understand your hesitation about splitting the control box to get at the ignition switch. No springs will fly out but some patience is required in getting it back together properly (aligning various levers). That same "Black" and the "Black/Yellow" wire can be at the powerpack itself and may be disconnected there. To stop the engine with that wire disconnected, simnply choke the engine until it floods out.