Author Topic: Jkson 6/1 rebuild  (Read 134084 times)

32 coupe

  • Hero Member
  • *****
  • Posts: 531
  • "Doc Johnson" on call !
    • View Profile
Re: Jkson 6/1 rebuild
« Reply #120 on: February 26, 2015, 11:33:44 PM »
Bruce,
I have a piece of stock that shows ahout 20 thou offset.
I have 2 new bolts.( I will have to cut the "block/offset" area to size)

I would be happy to finish the 20 offset or see if I can get closer to the 15 you said you need.
I could do it this weekend and get it out to you on monday

Look at my past posts and you will see pics I  posted of a few I have made.
They don't look as nice as several I've seen here. But they work fine.

Gary

Metro 6/1 turning a ST 7.5 KW gen head
Changfa 1115 turning a ST 15 KW gen head
Ashwamegh 2/25
John Deere 110 TBL
New Holland TC 30

"I was sitting here reading this thinking what an idiot you are until I realized it was one of my earlier posts !"

BruceM

  • Hero Member
  • *****
  • Posts: 3054
    • View Profile
Re: Jkson 6/1 rebuild
« Reply #121 on: February 27, 2015, 12:10:52 AM »
20 offset would be perfect, Gary, don't make it smaller.  Cash or trade for Dave's 40 offset, either is just fine for me. 

32 coupe

  • Hero Member
  • *****
  • Posts: 531
  • "Doc Johnson" on call !
    • View Profile
Re: Jkson 6/1 rebuild
« Reply #122 on: February 27, 2015, 12:33:49 AM »
Bruce,
Message your address and I'll get it in the mail by monday.
No charge. Just post your results here.

Several have asked "how do you keep it from turning".
This is how I  did it.

The bolt has a shoulder that rides on.the inside of the block. The sleeve wih the offset
is the same or a little thinner than the block. When the crank bearing housing and side gaskets
are in place the nut will "hold everything" together.
With that said , I do a preliminary "set up". Then remove the bolt and offset and "loctite" the bolt and
the offset together. I then reinstall bolt with the offset "glued" to it. The unit will still rotate for final
adjustment. I cut a slot in the end of the bolt. I hold this slot with a screwdriver while I tighten the
nut with a wrench.

Just how I do it. Yout results may vary.

« Last Edit: February 27, 2015, 12:40:39 AM by 32 coupe »
Metro 6/1 turning a ST 7.5 KW gen head
Changfa 1115 turning a ST 15 KW gen head
Ashwamegh 2/25
John Deere 110 TBL
New Holland TC 30

"I was sitting here reading this thinking what an idiot you are until I realized it was one of my earlier posts !"

BruceM

  • Hero Member
  • *****
  • Posts: 3054
    • View Profile
Re: Jkson 6/1 rebuild
« Reply #123 on: February 27, 2015, 01:10:55 AM »
Very generous, Gary, thank you!  I sent you an email to your forum listed address. 

Quinnf

  • Rest in peace
  • Hero Member
  • *****
  • Posts: 645
    • View Profile
Re: Jkson 6/1 rebuild
« Reply #124 on: February 27, 2015, 02:14:57 AM »
Great discussion!  I used a drop of red Locktite to stick the bushing to the shaft. 

Quinn


Ashwamegh 6/1, PowerSolutions 6/1 "Kit" engine, and a Changfa R175a that looks like a Yanmar I once knew

32 coupe

  • Hero Member
  • *****
  • Posts: 531
  • "Doc Johnson" on call !
    • View Profile
Re: Jkson 6/1 rebuild
« Reply #125 on: February 28, 2015, 09:22:57 PM »
Hey Bruce,
Check your email.

Gary
Metro 6/1 turning a ST 7.5 KW gen head
Changfa 1115 turning a ST 15 KW gen head
Ashwamegh 2/25
John Deere 110 TBL
New Holland TC 30

"I was sitting here reading this thinking what an idiot you are until I realized it was one of my earlier posts !"

Gippslander

  • Full Member
  • ***
  • Posts: 229
    • View Profile
Re: Jkson 6/1 rebuild
« Reply #126 on: March 09, 2015, 09:13:45 AM »
hI

I have not been doing much on the roid lately

I have started to make the new studs , I got some 3/4" 4041 steel

The head nut is a nice firm fit on the new stud. Not the sloppy loose fit the original studs have  :o

I did buy a 55 degree BSW threading bit for this job .

« Last Edit: March 09, 2015, 09:19:14 AM by Gippslander »
Gippsland is in the S.E. corner of mainland Australia

mike90045

  • Mendocino Metro
  • Hero Member
  • *****
  • Posts: 1594
  • Mmmm BBQ
    • View Profile
    • Mikes Solar PV page
Re: Jkson 6/1 rebuild
« Reply #127 on: March 09, 2015, 03:48:42 PM »
Nice threads.   What would it cost "us" if you made a batch of studs, giving "us" a chance to start putting quality parts into our 'roids?  Price for a kit of 4 ?

Any advantage to BSW for the crankcase end, and SAE on the head end, allowing for graded nuts instead of "whatever these are" ?

dieselgman

  • Hero Member
  • *****
  • Posts: 3189
    • View Profile
    • Lister Parts
Re: Jkson 6/1 rebuild
« Reply #128 on: March 09, 2015, 10:34:39 PM »
One thing to consider... use of mild steel vs something hardened might be preferable in these studs. The reason for this is that the original design actually calls for just a little stretch in the stud to accommodate consistent pressure on the head sealing surfaces and the difference between cold and hot dimensions. Very nice threads! - as it should be!  :)

dieselgman
ALL Things Lister/Petter - Americas
Lyons Kansas warehousing and rebuild operations

Gippslander

  • Full Member
  • ***
  • Posts: 229
    • View Profile
Re: Jkson 6/1 rebuild
« Reply #129 on: March 16, 2015, 07:37:07 AM »
Hi

Well, this lump of 4140 steel is pretty tough and I have been machining it on a small lathe , it has been a long slow job  so I have changed over to the old Visby lathe with 3 HP .  This is the new idle gear spindle .

BTW at a local auction sale yesterday, there was a old  Lister model B petrol engine , 3 HP . It sold for about $200



Gippsland is in the S.E. corner of mainland Australia

Gippslander

  • Full Member
  • ***
  • Posts: 229
    • View Profile
Re: Jkson 6/1 rebuild
« Reply #130 on: March 27, 2015, 10:54:03 AM »
Hi

Well today I tried a trial fitting of the gib key . I fitted the flywheel . The key ways in the crankshaft are not very smooth , they must have been machined with a blunt milling cutter , so I used a thin diamond file and emery cloth and some lapping compound to smooth things out .  I also smoothed out the gib key surfaces and lapped the gib key into the keyway . I have been using blue marker pens  on the gib key as a guide , like blueing on bearings , but I cannot get a good tight fit for some reason . I think something is not flat or the faces are angled ? 

I will see how I go tomorrow

Mike

Gippsland is in the S.E. corner of mainland Australia

Gippslander

  • Full Member
  • ***
  • Posts: 229
    • View Profile
Re: Jkson 6/1 rebuild
« Reply #131 on: March 31, 2015, 02:59:00 AM »
Well, I am having problems

both of the Keyways in the crankshaft and the flywheels have been machined with a angled floor , the vertical sides of the keyways are not equal height .  

I have filed the gib key down with a angle across  the top face , this is the only fix I can think of . The difference is around .025" across the top of the key

the Indian machining is very bad , it has many inaccuracies  
 
Gippsland is in the S.E. corner of mainland Australia

32 coupe

  • Hero Member
  • *****
  • Posts: 531
  • "Doc Johnson" on call !
    • View Profile
Re: Jkson 6/1 rebuild
« Reply #132 on: March 31, 2015, 03:06:19 AM »
Mike,
I had the same problem. I did as you, used a blue marker pen
and just kept at it until I got a fit I was happy with.

Keep at it, you'll get it !

Gary


Metro 6/1 turning a ST 7.5 KW gen head
Changfa 1115 turning a ST 15 KW gen head
Ashwamegh 2/25
John Deere 110 TBL
New Holland TC 30

"I was sitting here reading this thinking what an idiot you are until I realized it was one of my earlier posts !"

Gippslander

  • Full Member
  • ***
  • Posts: 229
    • View Profile
Re: Jkson 6/1 rebuild
« Reply #133 on: April 02, 2015, 09:15:12 AM »
Mike,
I had the same problem. I did as you, used a blue marker pen
and just kept at it until I got a fit I was happy with.

Keep at it, you'll get it !

Gary




Ok thanks Gary .  I have filed down both keys and they seem to be OK now .

I pulled the cylinder liner out today, I cannot find any gunk or sand under it .  I have to get the protrusion down to .004" ( it is .008" right now ) . I have a small surface plate and a height gauge and I will carefully use a glass plate and grit paper to file down the cylinder top .

This has been a long road but one of these days I will see this roid running  ;D

The next big job is the flywheel balancing


I checked the valve timing and the inlet valve is within the specifications but the exhaust valve opens about 10 degrees early and closes about ten degrees late
Mike

« Last Edit: April 02, 2015, 11:03:00 AM by Gippslander »
Gippsland is in the S.E. corner of mainland Australia

Gippslander

  • Full Member
  • ***
  • Posts: 229
    • View Profile
Re: Jkson 6/1 rebuild
« Reply #134 on: April 03, 2015, 09:25:36 AM »
The weather is nice right now so I had better do some more fixing on this roid before Winter sets in.  :o   I did some work today and I have the cylinder liner protrusion down to .004"  . ;)

I pulled the valves out of the head and the valve guides are  out of specification - by a few thou  , the valve stems are wobbly in the guides , more crap Indian work  :embarassed:  I could make some new guides but not at the moment . Will do that later on .

Mike
Gippsland is in the S.E. corner of mainland Australia