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Bolens Briggs Npr6 1947


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#1 bowtiebutler956 OFFLINE  

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Posted December 05, 2012 - 09:00 PM

I posted some pics of this engine in another thread awhile back, just after I had bought it. Its a 47 Briggs NPR6 off a Bolens Power Ho. When I opened it up, I found a fantastic looking cylinder, but a bunch of rust pits on the deck of the block, particularly around the exaust valve, and on the sealing surface for the head gasket. How it ended up with this, and not so much as surface rust in the cylinder, I don't know. The bore is standard, and is within its tolerances. Anyway, I took the block to the machine shop to have it decked, and the valve seats machined. I only had them deck it far enough to get the head gasket surface clean. There is still rust pits around the exhaust valve, but the valve seat is now perfect, and the pits around the valve won't hurt anything. You can also see a grouve along side of one of the head bolts where someone probabally broke a head bolt off in the past, and had to do that to remove it. The head bolt threads in the block are still good. The fuel tank was also in ruff shape, so I took it apart, and knocked out the dents, removed the rust, and soldered it back together. I also replaced the threads for the gas cap on the tank, as they were in bad shape as well. This is definitely a labor of love, as it takes alot of hours to do all this! :bigrofl: Anyway here are a few pics of my progress to date. Thanks

Matt

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#2 Ryan313 OFFLINE  

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Posted December 05, 2012 - 09:07 PM

Great job on the tank Matt! You did a great job with the threads! I like the fuel shut-off on top of the tank, I have never seen that.

#3 chris m OFFLINE  

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Posted December 05, 2012 - 09:12 PM

Great Job! I really like the repairs you made to that tank! That engine will be good for another 100 years :thumbs:

Don't you just love these old engines!!! I have 2 5s's and a Clinton 700 and 1100. They bring back great memories for me as a child and I still love winding the rope and hearing them spring to life! (Love the sound of them) :D

#4 bowtiebutler956 OFFLINE  

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Posted December 05, 2012 - 09:44 PM

Great job on the tank Matt! You did a great job with the threads! I like the fuel shut-off on top of the tank, I have never seen that.

Thanks Ryan. The tank with the thru-rod fuel shut off, and the long S tube going to the air filter, are actually the reasons I bought this engine, as I already had an NPR6. :thumbs:

Great Job! I really like the repairs you made to that tank! That engine will be good for another 100 years :thumbs:

Don't you just love these old engines!!! I have 2 5s's and a Clinton 700 and 1100. They bring back great memories for me as a child and I still love winding the rope and hearing them spring to life! (Love the sound of them) :D

Thanks. These tanks really aren't all that difficult to take apart, and repair, but they are time consuming. To answer your question, yes I love these old engines. Actually, I just bought a 1949 5s today. It seems like these little engines are multipling like rabbits around me. Everytime I turn my back it seems like more of them show up! :bigrofl:

Matt

#5 Ryan313 OFFLINE  

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Posted December 05, 2012 - 09:52 PM

Actually, I did notice the funky air filter, but there is no picture showing it...

It might be worth writing a little how-to for taking apart the tank. I would like to know how to do the initial seperation; I dont know what holds it togther.
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#6 bowtiebutler956 OFFLINE  

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Posted December 05, 2012 - 10:32 PM

Actually, I did notice the funky air filter, but there is no picture showing it...

It might be worth writing a little how-to for taking apart the tank. I would like to know how to do the initial seperation; I dont know what holds it togther.

Most all of these old tanks are soldered together Ryan. Some have seems in the middle, others have end caps. I just heat them up along the seem untill the solder is melting, I then use a couple of oil filter strap wrenches, and twist them apart. You then can access the inside to remove dents, and rust. You then solder them back together the same way you sweat pipes when plumbing, or in a/c work. When soldering, you want to have the lip of the seem facing downwards. You then heat the tank untill its hot enough to melt the solder. When its hot enough, it will actually suck the solder upwards into the seem, and reseal the tank. Here are a couple pics of two different style tanks I've restored recently. One has the seem in the middle, the other has them on the end, but they come apart the same way. :thumbs:

Matt

I almost forgot to say, make sure to apply some flux paste to the surfaces that will be getting soldered together. This will help the solder stick better.

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Edited by bowtiebutler956, December 05, 2012 - 10:40 PM.

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#7 chris m OFFLINE  

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Posted December 05, 2012 - 10:43 PM

The threaded part you put on, was that a new part or from an old tank?

#8 chris m OFFLINE  

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Posted December 05, 2012 - 10:50 PM

Thanks Ryan. The tank with the thru-rod fuel shut off, and the long S tube going to the air filter, are actually the reasons I bought this engine, as I already had an NPR6. :thumbs:

Thanks. These tanks really aren't all that difficult to take apart, and repair, but they are time consuming. To answer your question, yes I love these old engines. Actually, I just bought a 1949 5s today. It seems like these little engines are multipling like rabbits around me. Everytime I turn my back it seems like more of them show up! :bigrofl:

MattI ahve noticed the same thing. It seems like 5s's are showing up all over the place. mine are both 1950 and the serial#'s are even close to each other. The only thing I don't like on the 5s's is the style tank and carb. (there ok) but I prefer the tank on top of the shroud, it just looks classier IMO. Again great job! you really do great work and I can tell you take pride in what you do!


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#9 bowtiebutler956 OFFLINE  

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Posted December 05, 2012 - 10:55 PM

The threaded part you put on, was that a new part or from an old tank?

It was a new part I picked up for $1.99 from a guy named Will, who has an ebay store calle Wills What Nots. He sells Briggs parts. He doesn't list these on ebay, but he sells them. Just send him a message on ebay, or if you need his phone no., just send me a PM. :thumbs:

Matt

Edited by bowtiebutler956, December 05, 2012 - 10:56 PM.

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#10 chris m OFFLINE  

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Posted December 05, 2012 - 10:59 PM

It was a new part I picked up for $1.99 from a guy named Will, who has an ebay store calle Wills What Nots. He sells Briggs parts. He doesn't list these on ebay, but he sells them. Just send him a message on ebay, or if you need his phone no., just send me a PM. :thumbs:

Matt

That's good to know! Thanks.

#11 chris m OFFLINE  

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Posted December 05, 2012 - 11:12 PM

Thats funny I just went to his store on Ebay, and I have bought from him before. (My Bad) :D

But I am glad you told me about the tank tops! :thumbs:

#12 Farmlife OFFLINE  

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Posted December 06, 2012 - 04:39 AM

That's looking great...excellent job.

#13 Nato77 OFFLINE  

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Posted December 06, 2012 - 02:25 PM

As always you do a great job fixing up your old motors. :thumbs: Wish I had more time to fix a couple myself.

My 1947 Power Ho also has the shut off on the top of the tank. Maybe all the 47's had that.
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#14 bowtiebutler956 OFFLINE  

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Posted December 06, 2012 - 07:35 PM

Thanks Nate, and you may be right, its possible the model N's on Bolens all came with that tank in 47. I know Briggs used that tank for several years, on different applications. I have a 47 NP that doesn't have this style tank, but it wasn't used on a Bolens.

Matt

#15 bowtiebutler956 OFFLINE  

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Posted December 08, 2012 - 06:53 PM

I made some progress today. I installed the new rings, lapped the valves, set the valve clearances, and assembled the long block. That was all I intended to do today, but I just couldn't resist painting the long block! :bigrofl: I didn't paint the rest of the engine parts, just the block. I'm happy with how its coming along. Nate, I did consider going back with the Bolens green, but I would have had to buy the paint, and I already had a gallon of black. That, and it would have been kind of sad to have it Bolens green, and no Bolens to put it on. :(

Matt

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