1993 135hp tach dead

[thehermit]

Re: 1993 135hp tach dead

Thanks John. I am going to replace the stator and flywheel. I will look closer at that top bearing. My guess is its OK. The magnet failure on the flywheel looks like hairline cracks and then self destruction. Who knows.

 

[j_martin]

Re: 1993 135hp tach dead

Thanks John. I am going to replace the stator and flywheel. I will look closer at that top bearing. My guess is its OK. The magnet failure on the flywheel looks like hairline cracks and then self destruction. Who knows.

If the laminations are hammered together on the stator, it'll seem to work, but tend to overheat. (eddy current loss, that's why it's laminated) If it isn't too bad, you can detail it with a small cold chisel and a file. Put a little clear laquer on the bare metal you make.

If the coils aren't shorted to ground, yer probably good to go.

hope it helps
John

 

[thehermit]

Re: 1993 135hp tach dead

John,
At this pont I am going to replace it. I dont want to damage the new used flywheel. I feel lucky to have found one locally. I will likely keep it as a spare which is what I did with the one bad regulator.

I assume this magnet break was causing all the problems right?

 

[thehermit]

Re: 1993 135hp tach dead

An Update: Tach still dancing around.

Replaced the flywheel with a very nice used one that has all of its magnets.
Swapped the stator with a used working stator.

Went to sea trial and I still have a Jumping Tach. When we were on sea trial we did notice that even by putting the throttle into its fast idle position it caused the tach to jump. This led me to believe that maybe the "trigger" has something to do with it?? I dont know what kind of damage the failed regulator may have caused other parts OR what damage the loose flywheel magnets may have casued. Everything under the flywheel looks good. I am pretty much stumped at this point. Any clues?


Note: Charging remains normal never breaching 14.5 (new regulators). We double checked for crossed and failed wires and connections for the sith time and its all good. The wiring harness is 4 years old.

 

[j_martin]

Re: 1993 135hp tach dead

Check your top engine bearing!!!!!

 

[thehermit]

Re: 1993 135hp tach dead

I visually inspected the bearing. It looked fine. I tried to move and check the crankshaft for play and...nothing. I greased the shaft before installing the new flywheel.

Is there a preferred way to check the top bearing?

 

[j_martin]

Re: 1993 135hp tach dead

I'm pretty sure you can pull the top bearing carrier (which is also the stator mount) without splitting the block, and check the bearing.

If your tach is jumping, and it isn't the tach or the wiring, then the flywheel is touching (hitting) the stator. Sumthin's seriously wrong with that.

hope it helps
John

 

[thehermit]

Re: 1993 135hp tach dead

John...Thanks I will pop the flywheel again and check out the top bearing again.

With the engine running fine otherwise is it safe to rule out the trigger and the switchbox?

Thanks for the help

 

[j_martin]

Re: 1993 135hp tach dead

John...Thanks I will pop the flywheel again and check out the top bearing again.

With the engine running fine otherwise is it safe to rule out the trigger and the switchbox?

Thanks for the help

The charging and the ignition systems are seperate systems. The tach runs off the charging system. Nothing ignition (trigger or switchboxes) would be involved.

A loose connection somewhere in the tach lead could be a problem leading you astray.

hope it helps
John

 

[thehermit]

Re: 1993 135hp tach dead

In my previous posts I claimed to have looked at the top bearing.....after looking at the parts blowup....I was looking at the seal to the bearing. Duh?!? I will try to remove and service the bearing tonight. My fingers are crossed! Book says to look for discolored, wear, or dryness.

 

[j_martin]

Re: 1993 135hp tach dead

In my previous posts I claimed to have looked at the top bearing.....after looking at the parts blowup....I was looking at the seal to the bearing. Duh?!? I will try to remove and service the bearing tonight. My fingers are crossed! Book says to look for discolored, wear, or dryness.

I've heard more than once, if all else fails, RTFM.

I hope you don't, but I think you're going to find some serious trouble with it.

On the way in, look real close at the stator for signs of being "touched" by the flywheel.

hope it helps
John

 

[thehermit]

Re: 1993 135hp tach dead

RTFM....roger that John...I'm learning. I hope I find a bad bearing so I can replace / service and get on with some fishing...update coming soon. The mystery problem is driving me crazy.

Also should be able to tell if flywheel was hitting the stator because I just put in a new clean used flywheel.


TH

 

[thehermit]

Re: 1993 135hp tach dead

I got the top bearing out and it looks fine. Wish I could say the same for the bearing housing which came out in 42 pieces after 3 hours. Ouch. I will be replacing all of this but no problem is obvious yet. I will compare the new bearing along side of the new one.

Fly wheel looked good stator also still good.