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Most People Would Have Scrapped This.


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#1 classic ONLINE  

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Posted October 21, 2014 - 08:50 PM

I picked up this 1948 Briggs ZZ today. It sat in a barn for a bazillion years according to the owner. I hesitated on buying it, but finally gave in. It looks a bit rough on the outside, but I don't think it's seen much use. The ignition parts, wires, and even the spark plug look original. I removed the points cover and the points will need a good cleaning.All of the linkages are intact and nothing has been cobbed up. I removed the head, the cylinder looks good and the piston fits tight in the bore. I'm hoping that the coil is still good and I'll be working on getting spark. The gas tank looks brand new inside, but the carb will need a good cleaning and a rebuild.

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#2 Bill56 OFFLINE  

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Posted October 21, 2014 - 09:03 PM

That's a classic for sure! Congratulations!!
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#3 classic ONLINE  

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Posted October 21, 2014 - 09:08 PM

It sure is Bill, can't wait to hear it run! Briggs model 23 rings are the same and I have a std. set kicking around. I'll re ring it, lap the valves and give it a go.

#4 MH81 ONLINE  

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Posted October 21, 2014 - 09:12 PM

Just goes to show you never judge a book by its cover.

#5 superaben OFFLINE  

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Posted October 21, 2014 - 09:13 PM

Those ZZ engines are tough engines.  When they run, they will beat the heck out of whatever you have it sitting on.  It'll jump off a bench if you let it.  But they do have the power.

 

The coils are not usually bad, I bet you'll be fine.

 

Ben W.


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#6 Bill56 OFFLINE  

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Posted October 21, 2014 - 09:17 PM

Not sure why, but I like old engines with the round fuel tanks.
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#7 classic ONLINE  

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Posted October 21, 2014 - 09:18 PM

Darn straight MH81! I just got one of these ZZ engines running that was destined for the scrap yard. All it needed was a coil and the points cleaned. I put a good carb on it, too and it fired right up. It didn't smoke and it can idle super low, but man are they a bear to pull over with a rope.

#8 MH81 ONLINE  

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Posted October 21, 2014 - 09:20 PM

but man are they a bear to pull over with a rope.


And God help ya if it decides to pull back :D
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#9 Sawdust OFFLINE  

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Posted October 21, 2014 - 09:43 PM

Nice find Jim, sometimes that ole barn dust acts as a preservative. If it could only talk to you.


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#10 Lauber1 OFFLINE  

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Posted October 21, 2014 - 09:43 PM

I have several of the Z models and some of the smaller K ones. I usually start them by letting them bounce back a little when I pull the rope. Seems like you have to hold the kill switch down for 10mins to get one to stop firing, with that big flywheel on it.


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#11 Nato77 ONLINE  

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Posted October 21, 2014 - 11:01 PM

Nice engine! You even got the crank with it!
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#12 jabelman OFFLINE  

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Posted October 22, 2014 - 05:19 AM

Nice find! Leave at all crusty and just restore the internals to get it running again
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#13 DougT ONLINE  

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Posted October 22, 2014 - 07:10 AM

Is that the one that's going to find its way on the Mighty Mite? I have seen one with that style crank set up on it.


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#14 Bruce Dorsi OFFLINE  

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Posted October 22, 2014 - 09:47 AM

I'm hoping that the coil is still good and I'll be working on getting spark.

 

 

 

If you are unsuccesful in getting a spark, and suspect the coil, do not give up on the coil, yet.

 

We have succesfully revived many of those old #29656 coils by "baking" them in an oven at a low temp to dry out moisture which gets inside the coil and shorts across the windings.

 

Care must be taken, as too high a temperature will melt the insulation.  ....An hour or so in a 150* oven will usually do the trick. 


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#15 classic ONLINE  

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Posted October 22, 2014 - 10:37 AM

I plan on putting one of the ZZ engines on the Mighty Might when I get to that point.Both engines are from '48,but the Mighty Might is set up for a long hand crank that passes through the front of the frame, so I wouldn't be able to use the Briggs hand crank set up. I do want to use the cast iron blower shroud and the head without the fins, though.
I was able to get spark out of the coil after installing the coil on my running ZZ, but the engine would only pop intermittently. It seems like the coil is not making a hot enough spark. I even changed out the plug wire, but no change. I reinstalled my good coil back in the running ZZ and it fired right up and ran fine.Thanks for the tip on drying the coil out in the oven, I'll give it a try. At least I have a good coil for the Mighty Might project and a couple of ZZ engines to work with. I'm ordering two pieces of 4140 round shaft 1-1/2"x12-1/4" to have two new rear axles made for the Mighty Might. One of my axles is slightly bent, and the other two have messed up key slots. I pulled the bearings and seals out of the rear and found original New Departure bearings and correct replacement seals...That took hours! The transmission bearings are tight, but I found the correct bearing that presses into the frame for the transmission input shaft, and also the seal for the transmission tail shaft. This project is involved, but relatively simple. At least when it's up and running, I won't have to worry about leaks and bad bearings. There's nothing like dragging junk out of the weeds and getting it going again!

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