Home › Forum › Ask A Member › 1971 50hp Johnson
- This topic has 11 replies, 5 voices, and was last updated 7 years, 9 months ago by
fleetwin.
-
AuthorPosts
-
August 1, 2017 at 6:18 pm #7802
My nephew needs me to help him with a ’71 50hp Johnson m#50ESL71S.
I’ve never worked on anything this new. I don’t know anything about the ignition
system on it.
It also has the electric shift. I have no idea how to work on this either.
He said it wouldn’t start with the key, it cranks but won’t fire. But it fires right off
with a pull rope. He said all they had was the anchor rope and all he could get was
one rap around the flywheel but it was enough to start it.
When the key is turned to shut it off it goes into forward gear as it dies.
Any suggestions on what to check.
Thanks
Steve A WMember of the MOB chapter.
I live in Northwest IndianaAugust 1, 2017 at 6:26 pm #62492Do you have neutral when it’s running? Are you able to shift thru all the gears R-N-R? If so you are lucky. A lot of those systems do not shift anymore, and default to F to get you home anyway.
Someone correct me if I am wrong please…
August 1, 2017 at 6:43 pm #62493Hm-m-m, cranks but won’t start but starts with a rope. That’s a bit unusual. Does it seem to be cranking at least 200 RPM? They won’t have spark if cranking too slow. And yes you can achieve 200 RPM with a rope. Check the spark while electric cranking spark plugs in) It should throw a 7/16" spark with ease. Don’t get hooked up with that spark or it will knock you right out of your shorts.
Don’t fear the "electric" shift. It isn’t electric shift anyway–it’s Hydro-Electric shift. It actually shifts by hydraulic (oil) pressure. The electric part only directs the oil flow from a pair of valves. The two problem areas are dirty, contaminated oil and the usual electrical problems like rotted wires, bad connections and failure of the shift switch in the remote control. I hate to admit it, but the Johnson switch is better than the Evenrude one. Yes, it is supposed to go into forward gear if not running (or failure of the system).
August 1, 2017 at 7:06 pm #62494I’ve been learning about these myself. There’s a bit to learn.
August 1, 2017 at 7:51 pm #62496amuller, I understand what you are saying, but you got the wrong motor. This one has the Mag CD. No "amplifier" and no longer any problem getting enough voltage to it. The Mag CD generates its own voltage, that’s why it has to be cranking >200 RPM.
I don’t see where the OP said he is having any problem with the shift, except for it popping into forward gear when not running—which it is supposed to do. When it stops. the oil pump stops, and there is no hydraulic pressure to hold it in neutral (or reverse) so it defaults to forward gear.
August 1, 2017 at 7:55 pm #62497August 2, 2017 at 3:05 am #62502Thanks for the replies.
I won’t see the motor till this weekend But I’ve got something to work with now.
What is the lower unit lube called? I know that it takes a special type, and that’s
all I knew about them till now.
Thanks again>Steve A W
Member of the MOB chapter.
I live in Northwest IndianaAugust 2, 2017 at 6:09 am #62510It was OMC Type C back in the day. Now it is called Evinrude/Johnson "Premium Blend".
August 2, 2017 at 2:34 pm #62515Thanks FrankR
Member of the MOB chapter.
I live in Northwest IndianaAugust 2, 2017 at 5:46 pm #62518Don’t know if Frank and I are saying the same thing, and don’t want to cloud the issue………..
Yes, if it cranks too slowly with the electric start, there will be no spark….Be sure the battery is fully charged and the alternator is working properly…
And yes, the unit does "default" to forward gear as a fail safe if power is lost….But, no, it should not shift into forward gear immediately when the key is turned "off". If the engine "bangs into forward gear" when the key is turned off, you have an alternator problem….Check stator windings, alternator rectifier, and shift diodes, aka "monkey balls".
Again, not trying to cloud the issue, Frank and I are probably saying the same thing….
Don -
AuthorPosts
- You must be logged in to reply to this topic.