question about temp switch 84 johnson 50hp

Elektryk · Sep 13, 2010

ok i gotta Q about that switch ...

the engine in an 84 johnson 50 hp

does it have anything to do with starting the engine?
lets say its fried and the wires a just hanging there

would it stop me from getting the engine started?

Elektryk · Sep 13, 2010

Re: question about temp switch 84 johnson 50hp

anyone?

Elektryk · Sep 13, 2010

Re: question about temp switch 84 johnson 50hp

and i was just thinkin that if that sensor is not there at all...
wouldnt it get more air???

Elektryk · Sep 13, 2010

Re: question about temp switch 84 johnson 50hp

please i need help with that.... i was trying to start that engine for all day today.. and when it was cranking sometimes it made that noise like backfire or something....

please i already bought 2 new batteries...

Daviet · Sep 13, 2010

Re: question about temp switch 84 johnson 50hp

If you are talking about the temp sender in the cylinder head, no, it will not have any effect on the starting of the engine.
If your engine will not start check the basics first, compression and spark check. If those are ok, move on to the fuel delivery system.

Elektryk · Sep 13, 2010

Re: question about temp switch 84 johnson 50hp

ok... spark ok compression n/a... fuel ok except primer...

whats next?

i did over heat the engine tho...

Daviet · Sep 13, 2010

Re: question about temp switch 84 johnson 50hp

If you overheated it enough to melt the temp sensor, I think a compression test is a must. Borrow a compression tester and check it, might be your source of the problem.

Elektryk · Sep 13, 2010

Re: question about temp switch 84 johnson 50hp

yes i did melt the temp sensor.... i get the compr. thing tommorrow

boobie · Sep 13, 2010

Re: question about temp switch 84 johnson 50hp

If you overheated the mtr enough to melt the temp sender wire you probably blew a head gasket and who knows what else. Start with a compression test first and go from there.

Elektryk · Sep 14, 2010

Re: question about temp switch 84 johnson 50hp

before i test it what compression should be?
i know that it should be fairly the same on both cyl.

im new to this soo.. little help would be great

Daviet · Sep 14, 2010

Re: question about temp switch 84 johnson 50hp

They don't list compression specs, to many variables. I would hope to see something in the 100-125 range, within 10% of each other.

Elektryk · Sep 14, 2010

Re: question about temp switch 84 johnson 50hp

ok im gonna go and get it

i should have the results in about an hour

Elektryk · Sep 14, 2010

Re: question about temp switch 84 johnson 50hp

ok im back with results

top cyl.

85 with plug in
95 without

bottom

125 with plug in
135 without

the top one is where the temp sens is...

so whats next?

Daviet · Sep 14, 2010

Re: question about temp switch 84 johnson 50hp

How did you get a compression reading with the plug in. Remove both plugs and check compression for accurate readings.
By the numbers you posted you have a compression problem on #1 cylinder.
I would remove the cylinder head and check the cylinder for damage. Maybe you will luck out and only have a damaged head gasket.

Elektryk · Sep 14, 2010

Re: question about temp switch 84 johnson 50hp

yea sorry for that i meant the top has ### with bottom plug in

ok so ill try and get the head off tomorrow and maybe take some pics

how much are the gaskets? and maybe perhaps there is a way of making my own?

Daviet · Sep 14, 2010

Re: question about temp switch 84 johnson 50hp

No, you can't make your own. Let us know what you find.

Elektryk · Sep 15, 2010

Re: question about temp switch 84 johnson 50hp

Hi
I remove the cylinder head and didn't see any damage in cylinder #1 it look like cylinder #2
I see some oil in water canals head

whats next?

Daviet · Sep 15, 2010

Re: question about temp switch 84 johnson 50hp

Looks like the head gasket was leaking between the cylinders. Make sure head is flat, itstall new head gasket, torque to spec, run engine to normal operating temp, retorque head gasket and then recheck compression.

Elektryk · Sep 15, 2010

Re: question about temp switch 84 johnson 50hp

does anyone know the torque specs?

i got the torque wrench but i dont know whats the bolt sequence

Elektryk · Sep 15, 2010

Re: question about temp switch 84 johnson 50hp

is that it?

18 to 20 foot pounds is correct, to be tightened in the following sequence.

8...10

5....6

1....2

4....3

8....7

question about temp switch 84 johnson 50hp

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