Blown engine; rebuild or replace with new

[ultrarunner]

It would seem the crank is the biggest problem... piston and rod are easier to deal with.

Last time I priced a crank for a small engine it was like 75% of what the engine could be bought for if bought right.

Grinding undersized only works if the right bearings set is available... building it back to stock is another option... had one done back in the early 80's and it was $65 and was told they were giving me a deal.

 

[oldpilgrim]

I'd dump it based on the broken cylinder and shaft.

To rebuild, You'lld need to pull the head, remove the piston/rod, replace the rings, hone the cyl, turn/replace the crank, get new bearings, gasket set, get new rod, and hope the cyl doesnt become a problem.

cost would be a couple hundred or more.

Nope, a new chinese model would be my choice.

 

[RandyT]

I think you will find that the piston skirt gets into the area of the cylinder that is broken. If so it won't hold up. Only other option would be a block but that may be as much as a complete replacement engine. Even it you did rebuild it I would be finding out the reason behind the lack of lubrication failure.

 

[apctjb]

Looks like a new engine then. Oldpilgrim; can you elaborate on "new Chinese model"; what are the pros and cons and where to source one? From previous post there appears to be no direct drop in replacement for my engine although I did find a Briggs that has a John Deere conversion kit although its on the pricey side. What are the modifications which are likely and how much time and $$$ am I likely to face to get a new engine to work.

Thanks

 

[buickanddeere]

Wonder why the rod friction welded it's self to the crank journal ?

 

[oldpilgrim]

habor freight sells Chinese exact copies of Honda engines, for cheap. I have no idea if you can get one that would fit, but I'd look.

 

[Kyle_in_Tex]

habor freight sells Chinese exact copies of Honda engines, for cheap. I have no idea if you can get one that would fit, but I'd look.

I wouldn't say "exact". But cheap they are. If you get one, don't even run it until you change the oil. Then run the fresh oil for 10 minutes or more and change again.

 

[Billrog]

Not sure what size shaft your tractor takes but I bought a Honda industrial 20 HP 1" shaft from my mill $900 on sale.

 

[KubotainNH]

HF doesn't look to sell vertical shaft motors that are big enough. Plenty of horizontal shaft motors. 1" shaft seems to be common in the 500cc range. Maybe something like this? You may have to pipe the exhaust out.

Briggs & Stratton® 17.5 HP Vertical Shaft Engine, 500 cc - Tractor Supply Co.
vertical shaft from Northern Tool + Equipment

 

[apctjb]

Okay; have been looking at various engines that might work. Found a new Briggs 19HP Intek (built for John Deere and says JD on the engine) that has the same PTO shaft diameter, has a fuel pump and a 9amp charging system. The Kohler that I am replacing had a 15amp charging system.

My understanding is that the electric PTO clutch requires at least a 9 amp charge which the Briggs just meets but is less than what the Kohler had. Any opinions as to will this be enough? I doubt I will ever be mowing the grass in the dark and needing to run the lights and PTO at the same time...

thanks