I.H 784 engine rebuild

[Gordy1]

Does anyone have any home made set up for removing the piston liners you can share, have seen it done on you tube but other than buying an hydraulic press is there an easier solution or bodges to do it that I can pass onto my boys.

 

[tinman]

i made a kind of lever to pull liners out of a couple of jd engines here last year but ive rebuilt 4 or 5 engines in the last 12 mths and didnt really struggle with the liners on any of them, mostly turned round on the engine stand and hammered/tapped out with an alu bar as a drift from the bottom.
if they dont move with that then its going to take more than a bodge to pull it.
this is where a hollow core jack cylinder comes into its own, its possible that on a 784 they are fond of where they are.
hollow core rams can be bought cheap enough on the bay, they aint enerpac but the one i have here is as good for one off's now and again.
i made a washer the size of the OD of the liner with threaded bar through it, then i cut two flats on either side, like at 9 and 3 o clock so the "washer could fit down inside the liner and when at the bottom it would sit flush on the liner, there was a bar with a foot on it after that so a bit of a lift and the liner would come out.
you could do that without a jack and use riser blocks both sides of the liner and tighten down the threadded bar to pull it, but m16-m20 threaded bar here with copper grease on it not m10 like.

ill take a pic maybe but its nothing to look at altho as i said, in that engine they could be tight.
whatever your at make sure and dont damage the top of the block or youl have to skim it, timber , ply or heavy cardboard ill save it as you press/pull.

 

[Gordy1]

Thanks for the advice tinman I'll pass it onto the boys, I know they have tried a couple of stout pieces of metal & threaded rod etc but the metal just started to bend so they must be really tight in there, if you could put a photo up of what you have made it might be handy (not bothered if it looks good or not) anything that will do the job or gives them an idea.

 

[tinman]

the liners i made that for werent horrid tight, a good pull would lift them, your IH is going to be a lot tighter, a lot of the liners now have a space round the top lip so are really only held there on o rings and a flat surface so an easy enough pull.
tbh id say your going to need to pull them with hydraulics.
a base plate like i have will do that end of it, the round bars centered it.
thats a hollow core jack ram there, e bay special, iirc about 60 or 70 quid, its cheap at that, enerpac id be 500+ id guess.
wild handy ram to have about for pullin.
what have you to hand, a porta power?, a bottle jack?, are ya handy.

 

[Mur Huwcun]

Be carefull with pullers as it’s possible to pull the groove out of the block with the sleeve. Sometimes it’s easier to chisel the sleeves out if they’re really stubborn to try and save the block.

 

[Gordy1]

the liners i made that for werent horrid tight, a good pull would lift them, your IH is going to be a lot tighter, a lot of the liners now have a space round the top lip so are really only held there on o rings and a flat surface so an easy enough pull.
tbh id say your going to need to pull them with hydraulics.
a base plate like i have will do that end of it, the round bars centered it.
thats a hollow core jack ram there, e bay special, iirc about 60 or 70 quid, its cheap at that, enerpac id be 500+ id guess.
wild handy ram to have about for pullin.
what have you to hand, a porta power?, a bottle jack?, are ya handy.

 

[Gordy1]

Thanks for the info, the boys are quite handy lads in the workshop, they have several sorts of jacks to hand, bottle, trolley, engine lift, screw etc,
But it sounds like the hollow core one could be handy to them as well,
I had a quick look on the bay & there's a few to choose from, your attachments are good so putting all together they should be able to come up with something, they have a small engineering firm that has done some work for them but being a few miles away & with the weight of the block they want to try & remove them themselves, will let you know how they get on.

 

[Gordy1]

Be carefull with pullers as it’s possible to pull the groove out of the block with the sleeve. Sometimes it’s easier to chisel the sleeves out if they’re really stubborn to try and save the block.

Thanks for the advice, I have seen this done on you tube, he seemed to make it look quite easy with a hammer & chisel but they would have to be careful as they go I would think.

 

[Ley253]

First of all, are they wet or dry liners?

 

[agrimax]

Wet.

 

[Ley253]

Should almost fall out then, and too thick to be "peeled" out as Perkins 3 152 can be. Is the pressure plate only touching the liner, or perhaps fouling the block? I have found normal threaded bar to be of little use, my Nuffield liners stripped one inch diam, without moving, the borrowed correct tool, removed then with little effort.A thrust bearing between the top nut and the Bridge is almost essential if using threads, it stops things binding up.

 

[agrimax]

They aren't usually hard to pull out on an IH. I've driven them out,hammering on a good piece of hardwood underneath them.Get them started and then a crows foot under each side of the top lip will bring them on up.

 

[Mursal]

Wee drop of diesel (overnight) in the joint between top of block and liner, as that's all that can be holding them in.
Just awkward to get at .......

 

[Ley253]

They aren't usually hard to pull out on an IH. I've driven them out,hammering on a good piece of hardwood underneath them.Get them started and then a crows foot under each side of the top lip will bring them on up.

Thats what I would expect, and the fact that it does not seem to be working, makes me think something is not right. For what its worth, I will post a photo and description of my home made liner puller later.( thats when the camera batteries have charged!)

 

[Ley253]

Wee drop of diesel (overnight) in the joint between top of block and liner, as that's all that can be holding them in.
Just awkward to get at .......

Just done a DB , all the liners had to be pulled all the way, so much rust and scale on the od.

 

[Gordy1]

Thats what I would expect, and the fact that it does not seem to be working, makes me think something is not right. For what its worth, I will post a photo and description of my home made liner puller later.( thats when the camera batteries have charged!)

Thanks for your reply look forward to seeing your puller.

 

[Ley253]

Here you are. All made from scrap, thread is from a milling machine, tube "bridge" is part of a gatepost,Bearing is from a jeep rear axle. "T" handle nut was made as an exercise some time ago, and rescued from under the lathe.Stainless spacers are ex catering machinery.

 

[Mursal]

The bearing is a great idea, our homemade "chair" for the liner to pull out into has four legs.

 

[H200GT]

Never done it myself with liners, but one option would be to weld the inside of the liner around the top to shrink it, should fall out then. Just make sure the welder is not to high, you dont want to burn through the liner.

Have used this method with bearing outer races several times successfully, see no reason it wouldn’t work with liners

 

[Ley253]

Never done it myself with liners, but one option would be to weld the inside of the liner around the top to shrink it, should fall out then. Just make sure the welder is not to high, you dont want to burn through the liner.

Have used this method with bearing outer races several times successfully, see no reason it wouldn’t work with liners

You would need a continuous bead to shrink the liner, and that would be hard to get on cast iron, which is the usual liner material.