Magnum 20+ KT17

[Mudrig150 331]

So I have two engines, a magnum 20 and a KT17. Both threw rods, but have way different amounts of damage.

 

The magnum 20 has a broken rod and slightly scrored crankshaft. The oil pump gear was damaged and the governor gear destroyed. The block is in perfect shape.

 

The KT17 had a bad front seal and grenaded (quite literally), and the crank, both connecting rods, half the block, and camshaft were completely disintegrated. The oil pump gear and governor gear were untouched.

 

So I was thinking of using parts from both engines plus buying parts from a magnum 18 to make basically one complete KT17 series 2. Would this be possible?

 

[953 nut 60,080]

Yes, these K Twins are a lot like the old air cooled VW engines. Parts interchange readily. Keep in mind that the parts from a vertical shaft twin will work too and they don't cost as much.

[WHX?? 51,781]

Completely disassemble both motors and scrap what can't be saved. Start a list of what you would need to build a motor out of what is left and then see if it is economically $$ feasible.

[Mudrig150 331]

Here's what I have:

1 Governor gear

1 Oil pump gear

The magnum block

Points side of the KT17 block

4 cylinder jugs, all have surface rust in the bores

1 good piston

1 good crank, I think

4 heads

2 intakes

1 carb with a stripped air filter hole

1 exhaust

1 air filter

1 voltage regulator

2 flywheel shrouds

1 LH shroud for each engine

 

So essentially 95% of a motor.

[ebinmaine 72,725]

Forgive my lack of knowledge  about the two cylinder engine. What is the 5% that you are missing?

[pfrederi 18,689]

1 hour ago, ebinmaine said:

Forgive my lack of knowledge  about the two cylinder engine. What is the 5% that you are missing?

For a 2 cylinder a second piston would be nice

[ebinmaine 72,725]

2 minutes ago, pfrederi said:

For a 2 cylinder a second piston would be nice

Okay. Now you see Paul. That's why you're here.

I'd have been standing there with my compression tester in hand for hours and hours and hours trying to figure out what's wrong....

[pfrederi 18,689]

If you are planning on using the engine on a Wheel horse you will have to investigate if the donors had the Thrust bearing on the crank.  Most KT and Magnums did NOT!!  Or you could use an electric PTO like I did on a KT donated by a JD317.

Edited April 8, 2019 by pfrederi

[ebinmaine 72,725]

11 minutes ago, pfrederi said:

If you are planning on using the engine on a Wheel horse you will have to investigate if the donors had the Thrust bearing on the crank.  Most KT and Magnums did NOT!!  Or you could use an electric PTO like I did on a KT donated by a JD317.

Paul I'm sure I've read about this before but is that to say that the belt drive on a Wheelhorse is okay for side load but the PTO pressure is too much somehow?

I ask because I have a kt 23 that, if I get it running, will end up on a horse project.

 

I know they never put a Kohler 23 into a Wheelhorse.

 

[pfrederi 18,689]

20 minutes ago, ebinmaine said:

Paul I'm sure I've read about this before but is that to say that the belt drive on a Wheelhorse is okay for side load but the PTO pressure is too much somehow?

I ask because I have a kt 23 that, if I get it running, will end up on a horse project.

 

I know they never put a Kohler 23 into a Wheelhorse.

 

The manual PTO pushes in on the end of the crankshaft. No KTs had ball bearings like the old K series singles. (ball bearing can deal with some end pressure0  The KTs used sleeve bearing with just a very small lip that basically kept the crank centered but if you apply end load you will wear it out very quickly.  Only one variation of the KT17s used the radial needle thrust bearing (27,28,29)  Others used only #7 sleeve you can see the small lip .

 

The tranny drive belt will not cause any issues on a sleeve bearing set up.

 

 

[Mudrig150 331]

My magnum and KT17 have sleeves. I only have one piston, and even if I did they'd be two different styles. I'm missing a ton of parts, like 3 pistons, the RH block half from the KT17, both LH shrouds, a busted governor gear and oil pump gear, the magnum 20 carb, and a ton of other parts.