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Can the same needle bearing that's used in the armature plate, also replace the bronze bushing in the lower end? Can these bearings, and seals be matched up at a local auto parts store vs. buying an over priced LB part? I realize the rod bearings, and rings will need to be specific. Just hoping to do this on a budget. Thanks for any response.

I got the D-600 tore down this evening. The bronze bushing in the lower crankcase is quite longer than the needle bearing on the top end. I'll have to get it pressed out to match a needle bearing to it. I was able to order a new set of rings, but I need a new piston as well. I can't believe the #606607 D-series piston has been discontinued. Does anyone know of another one that will work? I'll be taking the cylinder to have it honed. Thought about having the ports opened a little to give it some more umph!

If you don't mind waiting, I'll bet a D-series piston will turn up on eBay. You can still buy the F-series piston and rings, however.

Good luck.

Two-Stroke said:

If you don't mind waiting, I'll bet a D-series piston will turn up on eBay. You can still buy the F-series piston and rings, however.

Good luck.

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Yeah, I've noticed several F series ones on eBay at decent prices. I would think lots of D series are still in use. Like you said, I'll just have to wait until one comes along.

Fireman 123 said:

Can the same needle bearing that's used in the armature plate, also replace the bronze bushing in the lower end? Can these bearings, and seals be matched up at a local auto parts store vs. buying an over priced LB part? I realize the rod bearings, and rings will need to be specific. Just hoping to do this on a budget. Thanks for any response.

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Fireman, it's good to hear you decided to rebuild the D600 engine. I ordered a new coil for my D600 last week ----- $57 counting shipping. It's a tired 1973 model 5241. It could use a rebuild like yours --- so it will last another 36 years. :laughing: Any chance you could post some pics and notes for all the guys on the forum to follow along? You've certainly been helpful.

Regarding my 1980 model 5247 with an F100 engine that I recently got from the barn of an old buddy who passed away ----- thanks to you and the nice guys on the forum :thumbsup: I got it running again and worked out all the minor bugs. No more gas leaking from the air filter. It starts and restarts easily. The oem blade was still on it. I sharpened and balanced it and mowed for two hours without a hitch yesterday. Total repair cost was less than $20. :biggrin: I learned a lot on this forum.

Glad you've got it back in service. Glad we were able to help you. I'll try to take some pics whenever I re-assemble the D 600. I'll have to find a piston before I can. Lawn Boy has discontinued them.

Fireman 123 said:

Glad you've got it back in service. Glad we were able to help you. I'll try to take some pics whenever I re-assemble the D 600. I'll have to find a piston before I can. Lawn Boy has discontinued them.

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How did you determine the piston was bad? Or, did you just want to hone it out a little and put in a new piston and rings?

The piston has some scratches and scuff marks. I'll take it with me whenever I have the cylinder honed to get an expert's opinion though.

Is it possible to find a piston from another manufacturer of the same size? I've heard of this being done but haven't done it myself.

I picked up this '78 R7266 today. Cleaned the carb, and put a new float spring, and fuel bowl on. Then I cleaned the carbon out of the muffler. Exhaust ports were clean. Started with 2 pulls.
A friend of mine's boss has a similar 19" model that is in very, very good condition. He said they couldn't get it to start. Hopefully they'll be willing to sell it, and I'll be sure to post some photos if I end up with it.

Fireman 123 said:

I picked up this '78 R7266 today. Cleaned the carb, and put a new float spring, and fuel bowl on. Then I cleaned the carbon out of the muffler. Exhaust ports were clean. Started with 2 pulls.
A friend of mine's boss has a similar 19" model that is in very, very good condition. He said they couldn't get it to start. Hopefully they'll be willing to sell it, and I'll be sure to post some photos if I end up with it.

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Congratulations on the '78 R7266. It looks like one of the good, old fashioned simple ones. How did you clean carbon out of the muffler?

The manual you recommended (D400 & D600) arrived a couple of hours ago. Thanks for letting me know about it.

Fifteen miles away, in what used to be a small country town, I found a small engine shop now run by the third generation of the same family. They still have some old oem Lawn Boy parts in stock. If you don't find a new piston for the D600, let me know. I'll see if they've got one.

..... Hope you get the other LB from your friend's boss. I'm watching Craigslist and eBay hoping to get lucky. ... Slim pickin's for old LB's down here in the Dallas area.

Thanks! Your book has a section that explains how to de-carbon the exhaust. If I were you, I'd buy up all you could of the nos parts. Even if you don't need them, if you plan on tinkering with old Lawn Boys, you will at some point haha I have an old dealer near me that I have bought a ton of stuff from, and I've had good luck selling some things I didn't need on eBay. Thanks for keeping an eye out for the piston. I'm seriously thinking of rebuilding the one I got today instead. It seems to run fine, but I can hear the slack in the engine, and the compression is decent at best. The piston should be good enough to reuse. I learned that the bronze lower bushing has to be machined out to accept a F engine needle bearing as a replacement. This should make the engine a lot smoother.

Fireman 123 said:

Thanks! Your book has a section that explains how to de-carbon the exhaust. If I were you, I'd buy up all you could of the nos parts. Even if you don't need them, if you plan on tinkering with old Lawn Boys, you will at some point haha I have an old dealer near me that I have bought a ton of stuff from, and I've had good luck selling some things I didn't need on eBay. Thanks for keeping an eye out for the piston. I'm seriously thinking of rebuilding the one I got today instead. It seems to run fine, but I can hear the slack in the engine, and the compression is decent at best. The piston should be good enough to reuse. I learned that the bronze lower bushing has to be machined out to accept a F engine needle bearing as a replacement. This should make the engine a lot smoother.

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Regarding the bronze lower bushing, have you gotten a price for having it machined out to accept an F engine needle bearing?

Gene123 said:

Regarding the bronze lower bushing, have you gotten a price for having it machined out to accept an F engine needle bearing?

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Yes it's at a machine shop right now waiting to be done. It almost broke my heart when they told me how much they "believe" it'll cost. Here's a link to the process;http://www.mytractorforum.com/showthread.php?t=112798

Fireman 123 said:

Yes it's at a machine shop right now waiting to be done. It almost broke my heart when they told me how much they "believe" it'll cost. Here's a link to the process;"F" bearing in a "D" crankcase - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information

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Would you mind sharing with us how much they "believed" it would cost? Thanks for the mytractorforum link showing the process. It was great! That lucky fellow must have a nice shop with plenty of tools. He obviously was rather good at what he was doing.

Hey, I got my old faithful D-600 running again today. :biggrin: The engine is from a 19" pusher model 5241 (1973). The original deck went bad, so I put the D-600 on a model 5247 deck (1980). I've been using that engine since 1976. :thumbsup: I installed a new coil, and it started on the second pull. The coil was a genuine LB coil (now Toro). It was about $50 from Mowtown. It could use new crankcase seals. Have you ever put those in a D-600?

Gene123 said:

Would you mind sharing with us how much they "believed" it would cost? Thanks for the mytractorforum link showing the process. It was great! That lucky fellow must have a nice shop with plenty of tools. He obviously was rather good at what he was doing.

Hey, I got my old faithful D-600 running again today. :biggrin: The engine is from a 19" pusher model 5241 (1973). The original deck went bad, so I put the D-600 on a model 5247 deck (1980). I've been using that engine since 1976. :thumbsup: I installed a new coil, and it started on the second pull. The coil was a genuine LB coil (now Toro). It was about $50 from Mowtown. It could use new crankcase seals. Have you ever put those in a D-600?

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Sure, they quoted me $50 to do the machining (an hour's labor). I have the bearing on order. As far as seals go, I will be replacing them as I put the engine back together. I have read that you can make a seal driver out of PVC pipe so you don't have to completely remove the engine, just blade. Use a long pick to remove the old seals. You will need to remove the flywheel on the top side naturally.

Fireman 123 said:

Sure, they quoted me $50 to do the machining (an hour's labor). I have the bearing on order. As far as seals go, I will be replacing them as I put the engine back together. I have read that you can make a seal driver out of PVC pipe so you don't have to completely remove the engine, just blade. Use a long pick to remove the old seals. You will need to remove the flywheel on the top side naturally.

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Thanks. Will you be posting photos of your project? Particularly, the seals are important. However, many of us don't know what they look like or how to install them.

D engine pistons ARE available as aftermarket parts for very reasonable prices from such vendors as Tulsa Engine Warehouse. Piston/rings/wrist-pin sets. I can't comment on quality, they are made overseas.