It's h55d Tecumseh Lauson time! Lots of questions!

[WHNJ701 4,165]

So it's time to get this 551 running again.  The background, the po redid it as a father son project back in the late 90s and it hasn't ran in say 20 years.  When I bought he said it ran great they drained gas etc..  I believe him too.

 

So I it's in my shop now I have the time to figure it out I hope!  No spark.  I have new points and condenser on order.  The coil has been replaced visually looks ok,  the plug wire is dated 1983 on it.

 

I found only a little info online for this engine.

The tractor is in awesome shape I detailed it last year.

 

I am going some pics of the engine hopefully we can get it going.

 

@formariz I saw some old posts about the diodes, should I replace them, how do I know if they are still good?

[ebinmaine 72,671]

I saved some videos in my YouTube to time an HH60. I'll post or pm them if you like. 

[formariz 12,045]

@jabelmanI am not home now I’ll send you all the info later. I also have diodes if you need it.

[gwest_ca-(File Mod) 11,482]

Diodes allow current flow in one direction only. Hook ohmmeter leads to it. Then reverse the leads. If it reads one way only they are good.

https://www.wheelhorseforum.com/search/?q=h55d&quick=1&type=downloads_file

 

Garry

[Tractorhead 9,209]

Also take a closer Look to the clips where the diodes are inserted,

they tend to greenspan.

 

Gently clean with a small brass brush and protect with little dielectric grease.

[formariz 12,045]

 

 

 

[WHNJ701 4,165]

Thanks this all helps,. The key switch has 3 wires, 1 to the positive battery, 1 to the selonoid, and 1 to the to top of rectifier.  Is this correct?

[WHNJ701 4,165]

I guess another question if something is screwed up, can the charging and battery be eliminated and just run it with the pull start?

[formariz 12,045]

CAREFULL. If everything would be original to tractor absolutely no power to the switch. You will fry the magneto which is not easy to find. Solenoid is also unique to that tractor. It is activated by ground. Take a good look at diagrams I posted. Switch on that tractor is only used to activate ground to starter and to short ground to stop engine.

[formariz 12,045]

3 hours ago, jabelman said:

I guess another question if something is screwed up, can the charging and battery be eliminated and just run it with the pull start?

Correct

[WHNJ701 4,165]

12 minutes ago, formariz said:

Correct

I think to be safe its going to be pull start for now and hold off on the electronics, going by the diagram the key switch should be 2 pole, so mine has 3 and doesn't follow the diagram.  I don't want to fry out sometime, this engine so far appears in great condition after pulling the head.

 

If I don't use a battery do I need a discharge point for rectifier?  Anything in particular just run it as a basic pull start?

I appreciate your help, this engine I am not familiar with.  

[formariz 12,045]

Just remove the diodes from rectifier if you are going to use it with the battery disconnected. Then it is just like running any normal magneto engine. To stop it either choke it or use a normal toggle switch connected to the center terminal of rectifiers to ground out magneto. refer to diagrams posted.

[WHNJ701 4,165]

Made good progress today, changed the 20 year old oil, new plug, decarboned the head, pulled the diodes, removed the selonoid and battery cables, looks a lot cleaner with out the wiring.  

I already ordered the points and condenser, while I was cleaning up the inside of the flywheel the armature, filed the points, then put it all back together, gave a yank and checked the spark lots of it!  Gave a hit of choke cleaner and she rumbled for a few seconds!!  She wants to go!

 

 

[formariz 12,045]

Good news that it has spark. Many times magneto is fried because owners put power to ignition switch.  When you replace points take extra care with timing. They are finicky when it comes to that. I almost would attempt to start it now prior to that just to make sure it runs.

[WHNJ701 4,165]

Yeah that's the plan now if it runs fine the points are staying.  Hooking the control cables looks like it's going to be a treat.