no start 1982 70hp johnson

[Bradg]

I'm new to boating last year purchased boat with 70hp<br />johnson(1982), ran great the six times had out last year.Had engine winterized at a boating shop end of<br />last season. The first time I tried to start the engine this season it only cranks over but does not start. The bottom spark plug is getting wet so it is<br />getting fuel. Looks like is not getting any spark.<br />Are ther any easy checks I can do.<br /><br />Also is Champion QL77JC4 the correct spark plug for this engine, and at what gap. The owner manual lists<br />QL77J4 plug at .040 gap, I can not find this plug.

 

[Joe Reeves]

Re: no start 1982 70hp johnson

Brad... The Champion QL77JC4 is the proper s/plug with the gap set to .040 is correct.<br /><br />Rig up a spark tester of some kind whereas you can set a gap of 7/16". Remove the s/plugs and crank the engine to see if the spark jumps that gap with a very strong blue lightning like flame.<br /><br />If no spark or a weak spark, disconnect the large RED electrical connector at the engine. Crank the engine by energizing the solenoid with a jumper (Bat term to small 3/18" nut term). If you now have spark, replace the ignition switch.<br /><br />What are the compression readings?<br /><br />Let us know what you find.

 

[Bradg]

Re: no start 1982 70hp johnson

Motor has no spark at all even when energizing the solenoid with a jumper.<br /><br />compression readings 130, 130, 125. are these ok?<br /><br />Thanks

 

[Bradg]

Re: no start 1982 70hp johnson

Hello <br /><br />Is there any other test I could do at home.

 

[Joe Reeves]

Re: no start 1982 70hp johnson

I assume that you did disconnect the large RED electrical plug at the engine before jumping the solenoid?<br /><br />If so, and still no spark, I could only suggest that you check all electrical connections associated with the powerpack (could be dirty or broken), and as a last resort, replace that pack.

 

[gr8rg8r]

Re: no start 1982 70hp johnson

Brad,<br /><br />Dumb question: Is the safety clip in place?<br /><br />Richard

 

[Bradg]

Re: no start 1982 70hp johnson

Richard and Joe<br /><br />Yes the safety clip is in place. Going to check all other connections tonight. If still no spark it's off<br />to a repair shop as this is the extent of my abillity<br /><br /><br />Thanks for your help and I'll let you know what fixed<br />the problem<br /><br />Brad

 

[Bradg]

Re: no start 1982 70hp johnson

Hi<br /><br />After going through all connections, and removing power pack(at least I think it's the power pack, brown unit about 4" by 1 1/2" just behind coils)<br />I now have spark on bottom 2 cylinders (engine now<br />starts). Rechecked connections and looks like the<br />terminal, from orange wire coming from top coil,<br />is either worn down or damaged slightly as it does not look nice and rounded like other 3 terminals in the connector. Can this wire and terminal be pulled out of the connector so the terminal can be replaced. I tried to pull it out but did not want to damage anything and have to do more repairs.<br /><br />Thanks

 

[Bradg]

Re: no start 1982 70hp johnson

Another question, do you have to have the water ears<br />and fuel line hooked up to the engine when doing a<br />test for spark?

 

[Joe Reeves]

Re: no start 1982 70hp johnson

No, you're simply doing a test procedure, not attempting to start or run the engine.

 

[Bradg]

Re: no start 1982 70hp johnson

Does the terminal at the connector from the coil<br />have to be pulled out or pushed back through the connector.

 

[Bradg]

Re: no start 1982 70hp johnson

I Switched the terminals coming from coils to the<br />connector that goes to the power pack, the no spark now moved from the top to the middle. This tells me that there is no power getting to this line.<br /><br />Can anyboby tell me if this means that it needs a new<br />power pack or can something else cause this problem.<br /><br />Thanks for any help<br />Brad

 

[Bradg]

Re: no start 1982 70hp johnson

power pack was the problem. now have spark on all<br />cyl. will test out on lake on saturday.